PROGRAMMABLE AC/DC POWER SOURCE

EC750SA
Instruction Manual

NF Corporation

DA00049980-003

PROGRAMMABLE AC/DC POWER SOURCE

EC750SA
Instruction Manual Preface Thank you for purchasing the EC750SA Programmable AC/DC Power Source.
To ensure safe and proper use of this electric equipment, please read first Safety Precautions on thefollowing pages.
 Caution Symbols Used in This Manual
The following caution symbols are used in this manual. Be sure to observe these caution symbols
and their contents to ensure the safety of the user and avoid damage to the equipment.
！

WARNING

This mark indicates information for the avoidance of a hazard such as electric shock that may
endanger human life or cause injury during handling of the equipment.
！

CAUTION

This mark indicates information for the avoidance of damage to the equipment during handling.

 This manual has the following chapter organization.
If reading this manual for the first time, start from 1. OVERVIEW.
1. OVERVIEW
Briefly describes and explains the features, applications, and functions as well as brief
operation principles of the EC750SA.
2. PREPARATIONS BEFORE USE
Describes various cautions regarding preparations to be made before using the EC750SA,
ranging from installation to connection of the power supply.
3. PANEL AND BASIC OPERATIONS
Describes the functions and actions of the panel controls and their basic operations. Readthis chapter while operating the EC750SA.
4. ADVANCED OPERATION EXAMPLE
Describes how to use advanced functions.
5. MENUS
Explains the LCD screen configuration and setting items of each menu.
6. REMOTE INTERFACE
Describes the commands for controlling the EC750SA via the USB interface or RS232
interface.
7. TROUBLESHOOTING
Describes error messages and handlings when problems occur.
8. MAINTENANCE
Describes basic operation tests and daily maintenance procedures.
9. SPECIFICATIONS
Lists the specifications (functions and performance) of the EC750SA.

i

EC750SA Safety Precautions To ensure safe use, be sure to observe the following warnings and cautions.
NF Corporation shall not be held liable for damages that arise from a failure to observe these warnings
and cautions.
This product is a Class 1 product (with protective conductor terminal) that conforms to the JIS and IEC
insulation standards.

 Be sure to observe the contents of this instruction manual.
This instruction manual contains information for the safe operation and use of this product.
Be sure to read this information first before using this product.
All the warnings in the instruction manual must be heeded to prevent hazards that may cause major
accidents.

 Be sure to ground the product.
This product uses a line filter and must be grounded to avoid the risk of electric shock.
To prevent electric shock, be sure to safely implement grounding according to Japanese Standard
for Electrical Equipment Technology D (100 Ω or lower) or higher.
The EC750SA is automatically grounded when the 3-pin power plug is connected to a 3-pin power
outlet with a protective grounding contact.
This product does not come with a 3-pin to 2-pin conversion adapter. When using a separately sold3-pin to 2-pin conversion adapter, be sure to connect the grounding wire of the adapter to thegrounding terminal next to the outlet.

 Check the power supply voltage.
This product operates on the power supply voltage indicated in Grounding and Power Supply
Connection in this instruction manual.
Prior to connecting the power supply, check that the voltage of the power supply matches the rated
power supply of the product.

 In case of suspected anomaly
If this product emits smoke, an abnormal smell, or abnormal noise, immediately power it off andstop using it.
If such an anomaly occurs, do not use this product until it has been repaired, and immediately report
the problem to the location of purchase (either NF Corporation or our agent).

 Do not use this product when gas is present.
An explosion or other such hazard may result.

 Do not remove the cover.
This product contains high-voltage parts. Absolutely never remove its cover.
Even when the inside of this product needs to be inspected, do not touch the inside. All suchinspections are to be performed by service technicians designated by NF Corporation.

 Do not modify this product.
Absolutely never modify this product, as this may cause new hazards and may disqualify thisproduct from repair in case of failure.
ii

EC750SA Do not expose this product to water
When this product is used in wet condition, it may cause an electric shock and a fire. If this productis exposed to water, unplug the power cord immediately, and contact NF Corporation or one of ouragent.

 If lightning occurs, power off this product and unplug the power cord
A lightning may cause an electric shock, a fire and a failure.

 Prevention of electric shock due to output voltage
The maximum output voltage of the EC750SA is ±440 V.
Operate carefully the EC750SA to avoid electric shock.
Directly touching the output or changing cable connections while output is on may cause electric
shock.

 Safety-related symbols
The general definitions of the safety-related symbols used on this product and in the instruction
manual are provided below.
！

Instruction Manual Reference SymbolThis symbol is displayed to alert the user to potential danger and referhim/her to the instruction manual.
Electric Shock Danger SymbolThis symbol indicates locations that present a risk of electric shock under
specific conditions.
Protective Ground-Terminal SymbolThis symbol identifies a pin that must be grounded to avoid electric shock.
Before operating the device, be sure to safely implement grounding
according to Japanese Standard for Electrical Equipment Technology D(Type 3, 100 Ω or lower) or higher.

！

WARNING

Warning SymbolThis symbol indicates information for avoiding danger to human life or bodily
injury while handling this product.

！

CAUTION

Caution SymbolThis symbol indicates information for preventing damage to the productwhen handling it.

iii

EC750SA Other symbols
This symbol indicates the “on” position of the power switch.
This symbol indicates the “off” position of the power switch.
This symbol indicates that the external conductor of the connector is connected tothe case.
This symbol indicates that the external conductor of the connector is connected tothe signal ground.

 Waste disposal
To help ensure environmental protection, please note the following precautions regarding disposalof this product.
<1> This product contains a lithium battery.
<2> Use a professional industrial waste contractor to dispose of this product.

iv

EC750SA

Contents
page Preface  .................................................................................................................. i Safety Precautions ................................................................................................ ii
1.

OVERVIEW .......................................................................................................... 1-1
1.1 General ........................................................................................................... 1-2
1.2 Features .......................................................................................................... 1-2
1.3 Applications .................................................................................................... 1-3
1.4 List of Functions .............................................................................................. 1-4
1.5 Operation Principles ........................................................................................ 1-6

2.

PREPARATIONS BEFORE USE .......................................................................... 2-1
2.1 Checking Before Use ...................................................................................... 2-2
2.2 Installation Environment .................................................................................. 2-3
2.3 Grounding and Power Supply Connection ...................................................... 2-6
2.4 Simple Operation Checks ............................................................................... 2-8
2.5 Calibration ..................................................................................................... 2-10

3.

PANEL AND BASIC OPERATIONS ...................................................................... 3-1
3.1 Panel Components and Operations ................................................................ 3-2
3.1.1 Operation panel ......................................................................................... 3-2
3.1.2 Front panel................................................................................................. 3-3
3.1.3 Rear panel ................................................................................................. 3-4
3.2 Display and Initial Settings at Power-on ......................................................... 3-5
3.3 I/O Terminals ................................................................................................... 3-8
3.3.1 Output terminals (front and rear) ............................................................... 3-8
3.3.2 RS232 connector ......................................................................................3-11
3.3.3 USB connector ......................................................................................... 3-12
3.3.4 External control I/O .................................................................................. 3-13
3.3.5 External signal input/external sync signal input terminal ......................... 3-15
3.4 Main Operation Example ............................................................................... 3-16
3.4.1 Power on/off ............................................................................................. 3-17
3.4.2 Setting output mode ................................................................................. 3-19
3.4.3 Setting output voltage range .................................................................... 3-21
3.4.4 Setting waveform ..................................................................................... 3-23
3.4.5 Setting output voltage .............................................................................. 3-24
3.4.6 Setting output frequency .......................................................................... 3-26
3.4.7 Using limiter functions ............................................................................. 3-28
3.4.8 Output on/off ............................................................................................ 3-32
3.4.9 Using measurement functions ................................................................. 3-33
3.5 Output Characteristics .................................................................................. 3-36

4.

ADVANCED OPERATION EXAMPLE ................................................................... 4-1
4.1 Use as a DC Power Source ............................................................................ 4-2
4.1.1 Connecting output terminal to load during DC output ................................ 4-2v

EC750SA

Contents

4.1.2 Selecting an output mode (AC+DC-INT mode) .......................................... 4-4
4.1.3 Setting the output voltage range ................................................................ 4-5
4.1.4 Setting the output voltage .......................................................................... 4-7
4.1.5 Setting output frequency of superimposed AC ........................................... 4-9
4.1.6 Setting superimposed AC waveform ........................................................ 4-10
4.1.7 Using the measurement function ..............................................................4-11
4.2 Measurement of Inrush Current .................................................................... 4-15
4.2.1 Inrush current .......................................................................................... 4-15
4.2.2 Set phase at output on ............................................................................. 4-16
4.2.3 Set measurement display to peak value .................................................. 4-17
4.2.4 Reset the peak current hold value ........................................................... 4-18
4.3 Measurement of Harmonic Current ............................................................... 4-20
4.4 Using the Sequence Function ....................................................................... 4-22
4.4.1 Sequence operations ............................................................................... 4-22
4.4.2 Sequence settings ................................................................................... 4-29
4.4.3 Programming sequences ......................................................................... 4-31
4.4.4 Control of sequence operations ............................................................... 4-37
4.4.5 Clear sequence memory .......................................................................... 4-39
4.4.6 Example of sequence operation settings ................................................. 4-40
4.4.7 Execution of sequence operations ........................................................... 4-44
4.5 Control Using External Control I/O Connector .............................................. 4-48
4.6 Output of Arbitrary Waveforms ...................................................................... 4-49
4.7 Synchronize the Output with External Signal ................................................ 4-51
4.7.1 External signal synchronization ............................................................... 4-52
4.7.2 Line synchronization ................................................................................ 4-54
4.8 Using Memory Functions .............................................................................. 4-55
4.9 Amplification of External Signal .................................................................... 4-58
4.10 Adding External Signals and Internal Signals ............................................... 4-62
5.

MENUS ................................................................................................................ 5-1
5.1 Screen Configuration ...................................................................................... 5-2
5.1.1 Status icons ............................................................................................... 5-4
5.1.2 Warnings and error messages ................................................................... 5-5
5.1.3 Sequence display ...................................................................................... 5-5
5.2 Basic Operations ............................................................................................. 5-6
5.2.1 Menus ........................................................................................................ 5-6
5.2.2 Navigating the menu tree ..........................................................................5-11
5.2.3 Numerical value input operations............................................................. 5-12
5.2.4 Selection and input operations that require confirmation ......................... 5-12
5.2.5 EXEC input .............................................................................................. 5-13
5.2.6 Shortcut keys ........................................................................................... 5-13
5.3 SET Menu ..................................................................................................... 5-14
5.3.1 Output mode setting ................................................................................ 5-15
5.3.2 Output voltage range setting .................................................................... 5-16
5.3.3 Setting output voltage .............................................................................. 5-17
5.3.4 Setting output frequency .......................................................................... 5-18vi

EC750SA

Contents

5.3.5 Output initial phase settings .................................................................... 5-18
5.3.6 Waveform settings ................................................................................... 5-19
5.3.7 Peak current limiter settings .................................................................... 5-19
5.3.8 RMS current limiter settings ..................................................................... 5-20
5.4 MEASURE Screen ........................................................................................ 5-21
5.4.1 Output voltage measurement ................................................................... 5-22
5.4.2 Output current measurement ................................................................... 5-23
5.4.3 Output power measurement ..................................................................... 5-24
5.4.4 Load power factor measurement ............................................................. 5-25
5.4.5 Load crest factor measurement ............................................................... 5-25
5.4.6 Output harmonic current measurement ................................................... 5-26
5.4.7 External synchronization frequency measurement .................................. 5-26
5.5 MISC Menu ................................................................................................... 5-27
5.5.1 Sequence (SEQUENCE).......................................................................... 5-27
5.5.2 Memory (MEMORY) ................................................................................. 5-31
5.5.3 Remote (REMOTE) .................................................................................. 5-32
5.5.4 System (SYSTEM) ................................................................................... 5-33
5.5.5 Setting range limiter (LIMIT) .................................................................... 5-34
5.5.6 Selection of measurement display (MEASURE) ...................................... 5-35
5.5.7 Reset of peak current hold value ............................................................. 5-35
5.5.8 Output on/off ............................................................................................ 5-36
5.5.9 Adjusting DC offset .................................................................................. 5-37
5.6 System Menu ................................................................................................ 5-39
5.6.1 Keylock .................................................................................................... 5-41
5.6.2 Beep sound .............................................................................................. 5-42
5.6.3 LCD contrast adjustment ......................................................................... 5-43
5.6.4 LCD display color setting ......................................................................... 5-44
5.6.5 Time unit setting ...................................................................................... 5-45
5.6.6 Output on/off setting at power-on ............................................................ 5-46
5.6.7 External control input enable/disable setting ........................................... 5-47
5.6.8 Reset function .......................................................................................... 5-48
5.6.9 System information .................................................................................. 5-48
6.

REMOTE INTERFACE ......................................................................................... 6-1
6.1 Remote Interface ............................................................................................ 6-2
6.1.1 USB ........................................................................................................... 6-2
6.1.2 RS232 ........................................................................................................ 6-4
6.2 Command List ................................................................................................. 6-7
6.3 Command Descriptions ................................................................................. 6-13
6.3.1 Overview of Programming Language ....................................................... 6-13
6.3.2 Detailed command descriptions ............................................................... 6-18
6.4 Command Tree ............................................................................................. 6-49
6.5 Status System ............................................................................................... 6-50
6.5.1 Status byte ............................................................................................... 6-51
6.5.2 Standard event status .............................................................................. 6-52
6.5.3 Operation status ...................................................................................... 6-54

vii

EC750SA

Contents

6.5.4 Warning status ......................................................................................... 6-55
6.6 Error Message List ........................................................................................ 6-56
6.7 Programming example .................................................................................. 6-57
6.8 Programming Precautions ............................................................................. 6-57
6.9 Notes on Remote Control .............................................................................. 6-57
7.

TROUBLESHOOTING .......................................................................................... 7-1
7.1 Protection Function ......................................................................................... 7-2
7.2 Error Messages and Error Handling ................................................................ 7-4
7.2.1 Error at power-on ....................................................................................... 7-5
7.2.2 Protection function-related errors .............................................................. 7-6
7.2.3 Panel operation errors ............................................................................... 7-7
7.2.4 Warning messages .................................................................................... 7-9
7.2.5 Remote-related external control errors .....................................................7-11
7.3 When Failure Is Suspected ........................................................................... 7-12

8.

MAINTENANCE.................................................................................................... 8-1
8.1 Introduction ..................................................................................................... 8-2
8.2 Routine Maintenance ...................................................................................... 8-2
8.3 Storage, Repackaging, and Transportation ..................................................... 8-4
8.4 Checking the Version Number ........................................................................ 8-5
8.5 Backup Battery ................................................................................................ 8-7

9.

SPECIFICATIONS ................................................................................................ 9-1
9.1 Output ............................................................................................................. 9-2
9.2 Current Limiter ................................................................................................ 9-6
9.3 Setting Range Limits ....................................................................................... 9-6
9.4 Signal Sources ................................................................................................ 9-7
9.5 Measurement Functions .................................................................................. 9-8
9.6 Sequence Function ........................................................................................9-11
9.7 Arbitrary Waveform Memory ............................................................................ 9-12
9.8 Setting Memory ............................................................................................. 9-12
9.9 Protection Functions ..................................................................................... 9-12
9.10 General ......................................................................................................... 9-13
9.11 External Control I/O ...................................................................................... 9-14
9.12 External Interface .......................................................................................... 9-15
9.13 Power Input ................................................................................................... 9-15
9.14 Withstand Voltage and Insulation Resistance ............................................... 9-16
9.15 Safety, EMC and RoHS ................................................................................. 9-16
9.16 Ambient Temperature Range, Ambient Humidity Range, Etc. ....................... 9-17
9.17 External Dimensions and Weight .................................................................. 9-18viii

EC750SAFigurespage
Figure 1-1. Block Diagram ................................................................................................ 1-6
Figure 2-1. Ambient Temperature and Humidity Ranges ................................................... 2-4
Figure 2-2. Power Source Inlet ......................................................................................... 2-7
Figure 2-3. Operation Check ............................................................................................. 2-9
Figure 3-1. EC750SA Operation Panel ............................................................................. 3-2
Figure 3-2. EC750SA Front Panel ..................................................................................... 3-3
Figure 3-3. EC750SA Rear Panel ..................................................................................... 3-4
Figure 3-4. Output Outlets (Front) ..................................................................................... 3-8
Figure 3-5. Output Terminals (Rear) ................................................................................. 3-9
Figure 3-6. Connection to Output Terminals ................................................................... 3-10
Figure 3-7. RS232 Connector ..........................................................................................3-11
Figure 3-8. USB Connector ............................................................................................. 3-12
Figure 3-9. External Control I/O Connector ..................................................................... 3-13
Figure 3-10. EXT SIG IN/EXT SYNC IN Terminal ........................................................... 3-15
Figure 3-11. POWER Switch ........................................................................................... 3-17
Figure 3-12. Example of Main Operations Screen (in AC-INT Mode).............................. 3-18
Figure 3-13. Example of Measured Value Window (AC-INT Mode) ................................ 3-33
Figure 3-14. Output Voltage (AC) vs. Output Current Characteristics ............................. 3-36
Figure 3-15. Output Voltage (DC) vs. Output Current Characteristics ............................ 3-36
Figure 4-1. Connection of Block Diode ............................................................................. 4-3
Figure 4-2. Connection of Backflow Diode ........................................................................ 4-3
Figure 4-3. Example of Measured Value Window (During AC+DC Mode) ........................4-11
Figure 4-4. Example of Harmonic Measurement Window Display ................................... 4-21
Figure 4-5. Example of Basic Step Transitions ............................................................... 4-25
Figure 4-6. Block Diagram of Sequence Mode Transitions ............................................. 4-25
Figure 4-7. Example of Sequence Operation from Hold Mode to <Start> ....................... 4-26
Figure 4-8. Example of Sequence Operation at <Branch> .............................................. 4-26
Figure 4-9. Loop Specification Method and Step Transition Example ............................. 4-27
Figure 4-10. Example of Step Synchronized Output ....................................................... 4-28
Figure 4-11. Sequence Operation during Wait for Phase 0° ........................................... 4-28
Figure 4-12. Sequence Shortcut Keys ............................................................................ 4-38
Figure 4-13. Step Transition Example (during AC+DC-INT mode) .................................. 4-40
Figure 4-14. LCD Screen During Sequence Execution ................................................... 4-47
Figure 4-15. Synchronized TTL Signal ............................................................................ 4-51
Figure 4-16. Example of Settings from Memory .............................................................. 4-55
Figure 5-1. LCD Screen (When Normal) ........................................................................... 5-2
Figure 5-2. LCD Screen (When Warning Is Displayed) ..................................................... 5-2
Figure 5-3. Menu Tree ...................................................................................................... 5-6ix

EC750SAFigures

Figure 5-4. Modification Box ........................................................................................... 5-12
Figure 5-5. Selection Box ................................................................................................ 5-12
Figure 5-6. EXEC Box ..................................................................................................... 5-13
Figure 5-7. Block Diagram of Signal Sources ................................................................. 5-16
Figure 6-1. Binary Block Data ......................................................................................... 6-14
Figure 6-2. Partial Command Tree .................................................................................. 6-15
Figure 6-3. Command Tree ............................................................................................. 6-49
Figure 6-4. Status System ............................................................................................... 6-50
Figure 6-5. Standard Event Status Register .................................................................... 6-52
Figure 6-6. Operation Status ........................................................................................... 6-54
Figure 6-7. Warning Status ............................................................................................. 6-55
Figure 7-1. Screen Display When Self Fault Check Errors Have Occurred ...................... 7-5
Figure 7-2. Screen Display When Protection Function-Related Error Has Occurred ........ 7-6
Figure 7-3. Screen Display When Panel Operation Error Has Occurred........................... 7-7
Figure 7-4. Screen Display When Warning Has Occurred ................................................ 7-9
Figure 8-1. Air Filter Cleaning Steps ................................................................................. 8-3
Figure 8-2. SYSTEM INFORMATION Screen ................................................................... 8-6
Figure 9-1. Temperature and Humidity Ranges............................................................... 9-17
Figure 9-2. External Dimensions ..................................................................................... 9-19x

EC750SATables
page
Table1-1. List of Functions (1/2) ....................................................................................... 1-4
Table1-2. List of Functions (2/2) ....................................................................................... 1-5
Table2-1. Panel Settings for Operation Check .................................................................. 2-9
Table3-1. Settings in Memory (1/3) ................................................................................... 3-5
Table3-2. Settings in Memory (2/3) ................................................................................... 3-6
Table3-3. Settings in Memory (3/3) ................................................................................... 3-7
Table3-4. Specification of RS232 interface ......................................................................3-11
Table3-5. Specification of USB interface ......................................................................... 3-12
Table3-6. External Control I/O Connectors ..................................................................... 3-14
Table3-7. Output Mode List ............................................................................................. 3-19
Table3-8. List of Setting Ranges for Various Output Voltage Range ............................... 3-21
Table3-9. Waveform List ................................................................................................. 3-23
Table3-10. Output Voltage Settings ................................................................................. 3-24
Table3-11. Output Frequency Setting .............................................................................. 3-26
Table3-12. Current Limiter Setting Ranges ..................................................................... 3-28
Table3-13. Voltage and Frequency Setting Range Limiter .............................................. 3-30
Table4-1. Panel Settings When Using EC750SA as a DC Power Source ......................... 4-2
Table4-2. Setting Range Options for Various Output Voltage Ranges .............................. 4-5
Table4-3. Output Voltage Setting Ranges When AC+DC Mode Is Selected...................... 4-7
Table4-4. Step Execution Parameters ............................................................................. 4-23
Table4-5. Step Transition Parameters ............................................................................. 4-24
Table4-6. Sequence Modes ............................................................................................. 4-25
Table4-7. Sequence Control ............................................................................................ 4-26
Table4-8. Setting Items in PROGRAM Screen (1/3) ....................................................... 4-32
Table4-9. Setting Items in PROGRAM Screen (2/3) ....................................................... 4-33
Table4-10. Setting Items in PROGRAM Screen (3/3)...................................................... 4-34
Table4-11. Items in CONTROL Selection Box ................................................................. 4-37
Table4-12. Program Settings ........................................................................................... 4-40
Table4-13. Functions of External Control I/O Connector ................................................. 4-48
Table4-14. Menu Items in MEMORY Screen ................................................................... 4-55
Table4-15. External Input Gain Setting Range ................................................................ 4-58
Table5-1. Status Icons List ................................................................................................ 5-4
Table5-2. Sequence Display ............................................................................................. 5-5
Table5-3. Items in SET Menu ............................................................................................ 5-7
Table5-4. Items in MISC Menu .......................................................................................... 5-8
Table5-5. Items in SEQUENCE Menu ............................................................................... 5-9
Table5-6. Items in MEMORY Menu ................................................................................... 5-9
Table5-7. Items in REMOTE Menu .................................................................................. 5-10xi

EC750SATables

Table5-8. Items in SYSTEM Menu .................................................................................. 5-10
Table5-9. Items in LIMIT Menu ........................................................................................ 5-10
Table5-10. Shortcut Keys ................................................................................................ 5-13
Table5-11. SET Menu Items and Output Modes .............................................................. 5-14
Table5-12. Output Modes ................................................................................................ 5-15
Table5-13. Output Voltage Settings ................................................................................. 5-17
Table5-14. Output Frequency Setting ............................................................................. 5-18
Table5-15. Output Initial Phase Settings ......................................................................... 5-18
Table5-16. Peak Current Limiter Setting Range .............................................................. 5-19
Table5-17. RMS Current Limiter Setting Range .............................................................. 5-20
Table5-18. Display Items in MEASURE Screen .............................................................. 5-21
Table5-19. Items in CONTROL Selection Box ................................................................. 5-27
Table5-20. PROGRAM Screen Items (1/3) ...................................................................... 5-28
Table5-21. PROGRAM Screen Items (2/3) ...................................................................... 5-29
Table5-22. PROGRAM Screen Items (3/3) ...................................................................... 5-30
Table5-23. Setting Range Limit (LIMIT) .......................................................................... 5-34
Table5-24. Setting range of DC offset adjustment value ................................................. 5-37
Table6-1. Command List (SOURce Subsystem)(1/2) ........................................................ 6-7
Table6-2. Command List (SOURce Subsystem)(2/2) ........................................................ 6-8
Table6-3. Command List (MEASure Subsystem) .............................................................. 6-8
Table6-4. Command List (DISPlay Subsystem) ................................................................ 6-8
Table6-5. Command List (STATus Subsystem) ................................................................. 6-9
Table6-6. Command List (OUTPut Subsystem) ................................................................ 6-9
Table6-7. Command List (INPut Subsystem) .................................................................... 6-9
Table6-8. Command List (TRACe Subsystem) .................................................................. 6-9
Table6-9. Command List (SYSTem Subsystem).............................................................. 6-10
Table6-10. Command List (PROGram Subsystem) ......................................................... 6-10
Table6-11. Common Command List (Common Commands and Queries) ........................6-11
Table6-12. Numerical Value Data Format ....................................................................... 6-14
Table6-13. Character Data Format .................................................................................. 6-14
Table6-14. Status Byte Register Definitions .................................................................... 6-51
Table6-15. Standard Event Status Register Definitions ................................................... 6-53
Table6-16. Error Message List ......................................................................................... 6-56
Table7-1. Protection Function ........................................................................................... 7-3
Table7-2. Self Fault Check Messages ............................................................................... 7-5
Table7-3. Protection Function-Related Errors ................................................................... 7-6
Table7-4. Panel Operation Errors (1/2) ............................................................................. 7-7
Table7-5. Panel Operation Errors (2/2) ............................................................................. 7-8
Table7-6. Warning Messages (1/2) ................................................................................... 7-9
Table7-7. Warning Messages (2/2) ................................................................................. 7-10
Table7-8. Remote Error Message List ..............................................................................7-11xii

EC750SATables

Table7-9. When Failure Is Suspected (Problem when Switching Power on/off) .............. 7-12
Table7-10. When Failure Is Suspected (Problem During Key Operation) ....................... 7-12
Table7-11. When Failure Is Suspected (Problem Related to Output Voltage or Output Voltage
Range Setting) .......................................................................................... 7-13
Table7-12. When Failure Is Suspected (Problem Related to Frequency Setting) ........... 7-13
Table7-13. When Failure Is Suspected (Problem Related to Output Error) ..................... 7-14
Table7-14. When Failure Is Suspected (Problem Related to Measurement Functions) .. 7-15
Table7-15. When Failure Is Suspected (Problem Related to Sequence Function) .......... 7-15
Table7-16. When Failure Is Suspected (Problem Related to Memory Function) ............. 7-15
Table7-17. When Failure Is Suspected (Problem Related to Limiter Setting Range Limit).................................................................................................................. 7-16
Table7-18. When Failure Is Suspected (Other Problems) ............................................... 7-16xiii

EC750SA1. OVERVIEW

1.1 General .............................................................................. 1-2
1.2 Features ............................................................................ 1-2
1.3 Applications ....................................................................... 1-3
1.4 List of Functions ................................................................ 1-4
1.5 Operation Principles .......................................................... 1-6

1-1

EC750SA1.1 General

1.1 General
The EC750SA programmable AC/DC power source is a power source that can output AC and DC power,features a compact design for convenient desktop use, and provides a wealth of measurement functions.
Rated output voltage is 100 Vrms (100 V range) or 200 Vrms (200 V range), with maximum output
capacity of 750 VA .
It also features eight output modes, with DC output, external input amplification, and line-synchronizedoutput.
The EC750SA can be controlled remotely from an external computer via USB or RS232 interface. The
accompanying software supports use of the following functions.
• Panel operations• Sequence editing and execution• Arbitrary waveform editing and transfer• Data logger (by capturing measured values)
Worldwide power supply input is supported. Input power factor control function minimizes power supply
input current.

1.2 Features
 Control panel with large LCD screen
Settings and measured values are displayed on a large, easy-to-read backlit screen.
 Various output modes
Output modes include two operation modes: alternate current (AC) and direct current (AC+DC), eachof which can be combined with four signal source modes: internal (INT), external (EXT), internal +external (ADD), and external synchronization (SYNC) for a total of eight modes. In the AC mode, DC
component is removed.
 Various measurement functions
The EC750SA is equipped with the following measurement functions.
• Voltage (RMS value, average DC value, peak value)• Current (RMS value, average DC value, peak value, peak hold value)• Power (effective, reactive, apparent)• Frequency (only in the external synchronization mode)• Load power factor• Load crest factor• Harmonic current (up to 40th harmonic, 50 Hz/60 Hz fundamental only)
Note: This measurement does not conform to the IEC or other standard.
1-2EC750SA

1.3 Applications

 Enables AC-superimposed DC output
When in the AC+DC mode, an AC wave (sine wave, square wave, or arbitrary waveform) can besuperimposed on the DC output.
 Also supports capacitor input load (up to crest factor 4 is supported)
Enables peak current output of up to four times as large as the maximum output current (RMS
value) at the rated output voltage.
 Can be used as an external input amplifier
When “internal + external” is selected, an internal signal source can be added to the external signal
input.
 Sequence function
When using an internal signal source, output parameters (output voltage, output frequency, etc.) can be
successively and rapidly changed or swept. In addition, output of specified patterns can be provided
by program in advance.
 Output current limiter function, voltage and frequency upper limit and lower limit
setting functions
The output current is limited within the maximum values that have been set independently for positive
and negative. As for the output voltage and the output frequency, their setting ranges can be
adjustable.
 USB interface (USBTMC), RS232 interface are standard equipped
USB interface and RS232 interface are provided for external control, such as from a personal
computer.
 Output outlets equipped on front panel (universal type)
Various types of power plugs from around the world can be connected.
 Supports worldwide range input power line voltages
Input power factor control (PFC) function for 90 V AC to 250 V AC helps minimize input power line
current.

1.3 Applications
 Research, development, and testing of various small-capacity built-in powersource units Research, development, and testing of various compact consumer electronics
devices Testing of battery-powered modules
 As power source for testing characteristics of relays and switches As power source for tests included in inspection lines for various devices

1-3EC750SA

1.4 List of Functions

1.4 List of Functions
The main functions of the EC750SA are listed below.
Table1-1. List of Functions (1/2)
Function

Output mode

OutputsystemDescription
Total of 8 modes(combinations of operation mode and signal source mode)
Alternate current - internal signal source(AC-INT mode)
Alternate current - external signal source(AC-EXT mode)
Alternate current - internal + external signal sources(AC-ADD mode)
Alternate current - external synchronization(AC-SYNC mode)
Direct current - internal signal source(AC+DC-INT mode)
Direct current - external signal source(AC+DC-EXT mode)
Direct current - internal + external signal sources(AC+DC-INT mode)
Direct current - external synchronization(AC+DC-SYNC mode)

Output on/off switch
Output voltage range
100 V range and 200 V range
Output voltage waveform(not including external signal Sine wave, square wave, arbitrary waveform (16 types)
source mode)
Peak current limiter function and RMS current limiter
Current limiter
function (variable limit values)
Setting range limiter function for output voltage andoutput frequency
Setting range limiter
Internal mode (AC-INT, AC+DC-INT) and internal +(not including external signal external mode (AC-ADD, AC+DC-ADD) only
source mode)
Setting range limiter function for output voltage
External synchronization mode (AC-SYNC,
AC+DC-SYNC)
Sequential output
Synchronized output
Basic measurements

Measurement
function Others

Output parameters: jump or sweep.
Can be synchronized with external sync signal or line
frequency
Voltage: RMS, average, peak
Current: RMS, average, peak, peak holdPower: Effective, reactive, apparent
Synchronization frequency: Only in SYNC mode
Load power factor
Load crest factor
Harmonic current: 50 Hz/60 Hz fundamental only, up to
40th

1-4

EC750SA

1.4 List of Functions

Table1-2. List of Functions (2/2)
Function

Description

USB interface

External control operation modes: Enable, disable
Control input:
Input level:
High level: +4.0 V or higher
Low level: +1.0 V or lower
Non-destructive max. input: +10 V/−5 V
Input impedance: Pull-up to +5 V at 47 kΩ
Control items:
Output on/off, sequence
start/stop, hold, branch
Status output:
Output level:
0 V/+5 V (open)
Output impedance: 100 Ω
Status items:
Power on/off, output on/off, limiter
operation, software busy, sequence
operation step sync output
Terminal: D-sub 25-pin multi-connector
Standard equipped

RS232 interface

Standard equipped

External control I/OExternal
control

1-5EC750SA

1.5 Operation Principles

1.5 Operation Principles
Figure 1-1 shows a block diagram of the EC750SA.
<2>CONTROLLER
RS232

PANEL

USB

SYSTEMCONTROL

CONTROLI/O

DISPLAYAMP
CONTROLOSC

EXT SIG IN±2.2V MAX
Zin=10kΩ
EXT SYNC IN
TTL<1>PFCCONVERTER<4>AMP
INVERTER<3>AMP 1
SUB-DCPSCIRCUIT～LINE 100V-230V
50Hz/60Hz
1.2kVA MAXISOCIRCUIT
(PRI)

POWER

PFC
CIRCUITLINEISO
CIRCUIT
(SEC)

POWER
PROTECTAMP

RANGE
CHANGEROUTPUT±440Vpk MAX
750VA MAX

<3>AMP 2ISO
CIRCUIT(PRI)ISO
CIRCUIT(SEC)

OUTPUT
AC250V MAX
750VA MAX

POWER
PROTECT
AMP

Figure 1-1. Block Diagram
The EC750SA is broadly divided into four blocks.
<1> DC power source block
The DC power source block includes power factor improvement functions. The block provides DC
power sources for various devices on PCBs and for the amplifier block, while improving the power
factor of power supply input.
<2> Signal source and system control block
This block includes an internal signal source with sequence functions, and is able to provide
AC+DC output. It can also be used with added external inputs and internal signal sources. This
block also contains the user interface.
<3> Isolation block
The isolation block isolates the primary side (mains circuit) and secondary sides.
<4> Amplifier block
The amplifier block includes a protection circuit.

1-6

EC750SA2. PREPARATIONS BEFORE USE

2.1 Checking Before Use ......................................................... 2-2
2.2 Installation Environment .................................................... 2-3
2.3 Grounding and Power Supply Connection ......................... 2-6
2.4 Simple Operation Checks .................................................. 2-8
2.5 Calibration ....................................................................... 2-10

2-1EC750SA

2.1 Checking Before Use

2.1 Checking Before Use
Before installing and using the EC750SA, make sure that it has not been damaged during shipment, andcheck that all the accessories and all parts of the main unit are included. If anything is missing, contact the
NF Corporation or our agent from which the product was purchased.

 Safety check
To ensure safety in using the EC750SA, the user should read the following sections of this instruction
manual before using the EC750SA:

See “Safety Precautions” (provided at the beginning of this instruction manual)See “2.3 Grounding and Power Supply Connection”

 Appearance and accessories check
If an abnormality (such as a flaw or dent) is found on the outside surface of the corrugated box,
carefully check if the product is adversely affected when removing the product from the corrugatedbox.
After opening the corrugated box, check the items contained in the box.
If an abnormality such as a flaw or dent is found on the product, or an accessory is missing, contact NF
Corporation or our agent.
 Appearance check
Check that no abnormalities such as a flaw and dent are found on the panel, controls, connectors, andso forth.
 Accessories check
The accessories of this product are listed below. Check that all items are included and not flawed.
• Instruction Manual (EC750SA Instruction Manual) ················································ 1• Control software (CD-ROM) ··········································································· 1• Power cord (varies depending on destination, 15 A/125 V for Japan, 2 m approx.)············ 1！

WARNING

This product contains high-voltage parts. Never remove the cover.
All internal inspections of this product are to be performed only by service technicians qualified by
NF Corporation.

2-2EC750SA

2.2 Installation Environment

2.2 Installation Environment
Note the following precautions to ensure the safe use and reliability of this product.

 Installation sites
 Do not set the product on its rear, top and side when installing it on a floor or desktop.
 Make sure that the four rubber feet on the bottom of the product are set evenly on a flat surface
when placed on a floor or desktop.
 To prevent risk of toppling, be sure to set this product on a surface that is level and is not subject tovibration, so that it can securely support this product weight (approximately 9.7 kg).

 Cautions for transport
When transporting this product, use the grips on the left side to keep the product upright while moving
it horizontally.
When transporting this product by hand cart, mount it on a horizontal surface, so that all four rubber
feet equally support its weight.
！

CAUTION

Condensation may form inside the product when the ambient temperature or humidity changes
suddenly, for example, after transportation in winter. In such case, leave the product in room
temperature enough time to evaporate the condensation, and then connect the product to the powersource.

2-3EC750SA

2.2 Installation Environment

 Conditions of installation site
 The EC750SA should be used indoors, and at altitude up to 2000 m.
 The EC750SA uses a fan for forced-air cooling. To allow for ample air flow, be sure to

maintain a gap of at least 50 cm between the air inlets and outlets along the sides and rear of
this product and walls or other obstructions.
 Do not stack the product on top of the other, or place it in front or back of the other(arrangement which makes the cabinet placed behind inhale the exhaust heat of the other).
 Install this product in a location that meets the following conditions for temperature andhumidity ranges.
Operation
guarantee

5% to 85%RH
Absolute humidity of 1 g/m3 to 25 g/m3, no condensation.

0°C to +40°C

5% to 85%RH
Performance+5°C to +35°C
guarantee
Absolute humidity of 1 g/m3 to 25 g/m3, no condensation.
Storagecondition

5% to 95%RH
Absolute humidity of 1 g/m3 to 29 g/m3, no condensation.

−10°C to +50°C

Product reliability may decline in extreme temperature and/or humidity environments. An
environment of approximately 25°C and 50%RH is recommended.
Figure 2-1 illustrates these ambient temperature and humidity ranges.

%RH
Storage condition

90
80

Performance
guarantee

7060Operation
guarantee

50
40
30
20
10
0
−10

0

10

20

30

40

50 °C

Figure 2-1. Ambient Temperature and Humidity Ranges

2-4EC750SA

2.2 Installation Environment

 Do not install the EC750SA in the following locations:• Location with flammable gas→ An explosion may occur. Never install and use this product in such a location.
• Outdoors, or location exposed to direct sunlight or near a fire or heat source→ The full performance of this product may not be obtained, or failure may occur.
• Location with corrosive gas, moisture, or high humidity→ This product may become corroded or fail.
• Location near an electromagnetic field source, high-voltage device, or power line
→ This product may malfunction.
• Location exposed to excessive vibration→ This product may malfunction or fail.
• Location with excessive dust
→ In particular, electrically conductive dust may cause failure of this product.

 This product may cause interference if used in residential areas. Such use must be avoided unlessthe user takes special measures to reduce electromagnetic emissions to prevent interference to thereception of radio and television broadcasts.

2-5

EC750SA

2.3 Grounding and Power Supply Connection

2.3 Grounding and Power Supply Connection
 Be sure to ground the EC750SA.
！

WARNING

This product uses a line filter. Be sure to ground this product. Otherwise, an electric shock
may occur.
To prevent an electric shock accidents, connect the product to ground.

When a 3-pin power plug that includes a protective ground contact is connected to a 3-pin power
supply outlet, this product is grounded automatically. The accessory power cord (Japan version) is
rated at 125 V AC.
A 3-pin/2-pin conversion adapter is not provided with this product. When using a separately sold3-pin/2-pin conversion adapter, be sure to connect the grounding wire of the adaptor to the groundterminal next to the outlet.
！

CAUTION

The power code can be used for disconnecting the product from AC power line in case of emergency.
Maintain enough space around the inlet, to be able to remove the connector of a power cord from theinlet. Use a power socket located at convenient place with adequate space around so that the plugcan be removed from socket.

 The power requirements of this product are as follows:
Voltage range:

100 V AC to 230 V AC ±10 % (when at 250 V or less)
Overvoltage category II

Frequency range:

50 Hz ±2 Hz /60 Hz ±2 Hz (single phase)Power consumption:

1.2 kVA or less

2-6

EC750SA

2.3 Grounding and Power Supply Connection

 Connect the power in this order.
1.

Make sure that the power source voltage to be used is within the specified range.

2.

Set the power switch to off.

3. Insert the power cord into the inlet on the rear panel.

Inlet

Figure 2-2. Power Source Inlet
4. Insert the power cord plug into a power supply outlet that includes a protective ground contact.
！

CAUTION

The accompanying power cord (Japan version) complies with Japan Electrical Appliance andMaterial Safety Law and is for use in Japan only. The rated voltage is 125 V AC and the withstandvoltage is 1250 V AC. This power cord cannot be used when the voltage exceeds 125 V AC or inlocations outside of Japan.

！

CAUTION

The accompanying power cord is for use with this product only. Do not use it with other products orapplication systems. Use only the attached power code for connection to AC power line.
The product itself has a withstand voltage of 1500 V AC.
If the power-supply voltage exceeds 125 V AC or if you want to use this product at outside of Japan,
contact NF Corporation or our agent.

2-7

EC750SA

2.4 Simple Operation Checks

2.4 Simple Operation Checks
The following describes simple methods for checking newly purchased products or products that havebeen in long-term storage.
！

WARNING

This product contains high-voltage parts. Never remove the cover.
All internal inspections of this product are to be performed only by service technicians qualified by
NF Corporation.

Check that the power goes on normally, and that the measured value set via the control panel is displayedcorrectly on the MEASURE screen.

 Operation steps
1. Set the EC750SA power source switch to on.

See “3.4.1 Power on/off”.

⇒ Operation starts once the power is on.

<1> Press switch to up ( | ) position.

<2> The LCD goes on and displays the initial screen.

The main operations screen that appears immediately after the power-on shows the samesettings that were displayed the last time the power was turned off. When a newly purchasedunit is turned on for the first time, the initial settings (factory settings) are displayed.
⇒

See “3.2 Display and Initial Settings at Power-on”, for description of the initial
settings.

2-8EC750SA

2.4 Simple Operation Checks

2. Panel settings
Set the EC750SA as shown below.

See “3.4 Main Operation Example”, for descriptorsof the settings methods.
Table2-1. Panel Settings for Operation Check
Setting

Item
Output mode

AC-INT mode

Output voltage range

100 V

AC output voltage

100 Vrms

Selected measurement display RMS

OUTPUT

3. Press the

key to turn on output.
Output on/off LED is on.

OUTPUT

Output is off.

OUTPUT

Output is on.

⇒ Check that the control panel MEASURE screen shows 100 Vrms as the AC output voltage.

Check display.

Figure 2-3. Operation Check⇒ If the normal values are not displayed, it may be due to an operation fault. Contact NF
Corporation or our agent.
4. When you turn off the power, check the OUTPUT on/off LED is off. Then press the powerswitch to the bottom () position. This shuts off the power supply and turns off the powersource unit.
！

CAUTION

Before turning off the power, make sure that the output on/off LED is off.

2-9EC750SA

2.5 Calibration

2.5 Calibration
To calibrate the EC750SA, contact NF Corporation or our agent.

2-10

EC750SA3. PANEL AND BASIC OPERATIONS

3.1

Panel Components and Operations ........................................... 3-2

3.1.1

Operation panel .................................................................. 3-2

3.1.2

Front panel ......................................................................... 3-3

3.1.3

Rear panel .......................................................................... 3-4

3.2

Display and Initial Settings at Power-on .................................... 3-5

3.3

I/O Terminals .............................................................................. 3-8

3.3.1

Output terminals (front and rear) ........................................ 3-8

3.3.2

RS232 connector ............................................................... 3-11

3.3.3

USB connector ................................................................. 3-12

3.3.4

External control I/O ........................................................... 3-13

3.3.5

External signal input/external sync signal input terminal .. 3-15

3.4

Main Operation Example ......................................................... 3-16

3.4.1

Power on/off ..................................................................... 3-17

3.4.2

Setting output mode ......................................................... 3-19

3.4.3

Setting output voltage range ............................................. 3-21

3.4.4

Setting waveform .............................................................. 3-23

3.4.5

Setting output voltage ....................................................... 3-24

3.4.6

Setting output frequency................................................... 3-26

3.4.7

Using limiter functions ...................................................... 3-28

3.4.8

Output on/off ..................................................................... 3-32

3.4.9

Using measurement functions .......................................... 3-33

3.5

Output Characteristics ............................................................. 3-36

3-1EC750SA

3.1 Panel Components and Operations

3.1 Panel Components and Operations
3.1.1 Operation panel
Numbers shown after names in the following figures correspond to item numbers in the detailed
descriptions below.

LCD

Output ON/OFF LED
3.4.8

5.1

CANCEL key

5.2

ENTER key

5.2

MODIFY dial

5.2

DIGIT key

OUTPUT key
3.4.8

5.2

UP/DOWN keys

Shortcut keys

5.2

5.2.6

Figure 3-1. EC750SA Operation Panel

3-2

EC750SA

3.1 Panel Components and Operations

3.1.2 Front panel
Numbers shown after names in the following figures correspond to item numbers in the detailed
descriptions below.

Power switch

Intake vent

3.4.1

8.2

Output outlets (universal type)3.3.1

Figure 3-2. EC750SA Front Panel

3-3

EC750SA

3.1 Panel Components and Operations

3.1.3 Rear panel

External signal input/external sync signal input connector

3.3.5

Exhaust vent
Output terminals

RS232 connector

3.3.2
LINE INPUT

USB connector

3.3.1

2.3

3.3.3

External control I/O connector

3.3.4

Figure 3-3. EC750SA Rear Panel

3-4

EC750SA

3.2 Display and Initial Settings at Power-on

3.2 Display and Initial Settings at Power-on
 Display at power-on
When the power switch is set to on, a fault check is performed automatically, and when that ends
normally operation mode is set.
The settings shown on the panel are those that were shown the last time the power source was turned
off. When a newly purchased unit is turned on for the first time, the initial settings are displayed.
See “4.8 Using Memory Functions”, for description of how to read settings saved tomemory.
An error message is displayed when an abnormality has occurred. After reading the error message,
turn the power source off immediately.
See “7.2.1 Error at power-on”, for description of error messages and recommended
responses.

 Initial settings
Table3-1 to Table3-3 list the initial settings for the EC750SA. When you reset this product, the itemswith a check mark in Table3-1 to Table3-3 are set to the initial setting value. Turn the output off, before
reset.
Table3-1. Settings in Memory (1/3)
Function
Select output mode
Select output voltage
range
Select external sync
signal source

Setting

Initial Setting
AC-INT

Reset√

Output voltage range

100 V

√

External sync signal source

LINE

Output mode

SIN/SQU
0.0 Vrms
ARB1 to ARB16
0.0 Vp-p
AC voltage
SIN/SQU
0.0 Vrms
200 V range
ARB1 to ARB16
0.0 Vp-p
AC voltage frequency50.0 Hz
Phase when the output turns on
0.0°
AC voltage waveform
Sine wave (SIN)
100 V range
0.0 V
DC voltage
200 V range
0.0 V
SIN/SQU
0.0 Vrms
100 V range
ARB1 to ARB16
0.0 Vp-p
AC voltage
SIN/SQU
0.0 Vrms
200 V range
ARB1 to ARB16
0.0 Vp-p
AC voltage frequency50.0 Hz
Phase when the output turns on
0.0°
AC voltage waveform
Sine wave (SIN)
100 V range

AC mode output(AC-INT,
AC-ADD,
AC-SYNC)

AC+DC mode output(AC+DC-INT,
AC+DC-ADD,
AC+DC-SYNC)

3-5

√

√

EC750SA

3.2 Display and Initial Settings at Power-on

Table3-2. Settings in Memory (2/3)
Function

Current limiter

Setting range limit

External input gain
setting
Select measurement
display

Sequence output

Adjusting DC offset

System settings

Setting
Peak current limiter 100 V range(positive)
200 V range
Peak current limiter 100 V range(negative)
200 V range
100 V range
RMS current limiter
200 V range
100 V range
Positive voltage
setting limit
200 V range
100 V range
Negative voltage
setting limit
200 V range
Frequency upper limit setting limit
Frequency lower limit setting limit
100 V range
External input gain
200 V range
Measurement display

Initial setting+31.5 A
+15.8 A
−31.5 A
−15.8 A
10.5 A
5.3 A+220.0 V+440.0 V−220.0 V−440.0 V
550.0 Hz
1.0 Hz
100
200

Reset

√

√

RMS

Step time
Step operation type
Step end phase enable/disable
Step end phase
Step termination
Jump steps
Jump countBranch steps
100 V range
AC mode200 V range
100 V range
DC mode200 V range
Keylock
Beep
LCD contrast
LCD display color
Time unit
Output on/off at power-on
External control input enable/disable

3-6

0.1000 s
Constant (CONST)
Disable (DISABLE)
0.0°
End (STOP)01
00.0 mV
0.0 mV
0.0 mV
0.0 mV
OFF
ON
55
White(WHITE)sOFF
Disable(DISABLE)√

EC750SA

3.2 Display and Initial Settings at Power-on

Table3-3. Settings in Memory (3/3)
Function

Setting
Interface

Remote

RS232

Baud rate
Terminator
ParityStop bit
Data bit
Flow control

3-7

Initial settingUSB
9600 bps“CR” ”LF”
None
1 bit
8 bit
None

Reset

EC750SA

3.3 I/O Terminals

3.3 I/O Terminals
3.3.1 Output terminals (front and rear) Connection to output outlet (front)
The front panel is equipped with universal type output outlets that accommodate power plug types
from various countries. These outputs are isolated from the power inputs and case (ground connection).
These outlets are used only for AC power. Use the rear output terminal for DC or AC+DC.
Polarity follows the Japanese standard. Use the rear output terminal for polarity-related settings suchas the initial phase.
Output outlets (universal type)Figure 3-4. Output Outlets (Front)

3-8

EC750SA

3.3 I/O Terminals

 Connection to output terminals (rear)
Outputs are isolated from the input power lines and the case (ground connection). When connecting toan output terminal, attach a round crimp contact with a sleeve that has sufficient capacity for the output
current.
DC output is based on “Lo”, so that the + polarity setting sets “Hi = positive”, and the - polarity
setting sets “Hi = negative”.

Output terminal

Figure 3-5. Output Terminals (Rear)！

WARNING

When output is on, do not touch the output terminal block.
To ensure safety, always attach the supplied terminal cover.

3-9EC750SA

3.3 I/O Terminals

 Connect cables to the output terminal block as described below.
Outputs are isolated from the input power lines and case.
1. Remove a screw attached to the output terminal block.
2. Insert the screw through the round crimp contact at the end of the cable.
3. Reattach the screw into the OUTPUT terminal while holding the crimp contact in place.
4. Turn the screw until it is securely fastened. The recommended fastening torque is 1.2 (N⋅m).
5. Connect the Hi, Lo, and ground cables, then attach the terminal cover.

 To tighten:

Turn clockwise.

 To loosen:

Turn counterclockwise.

Figure 3-6. Connection to Output Terminals！

WARNINGTo ensure safety, always turn the power off before connecting to output cables.

！

CAUTION

When using the EC750SA as a DC power supply, it is necessary to connect a diode for protection,
depending on the load, such as a capacitor and inductor.
For how to connect a diode for protection,

See “4.1.1 Connecting output terminal toload during DC output”.

3-10

EC750SA

3.3 I/O Terminals

3.3.2 RS232 connector
EC750SA is equipped with the RS232 interface to control from an external computer,See “6.

REMOTE INTERFACE”.

RS232 connector

Figure 3-7. RS232 Connector-------- Notes ---------------------------------------------------------------------------------------------------------- Binary transmission is not supported.
 Use a cross cable.
 To transfer arbitrary waveform data, use the USB interface.
----------------------------------------------------------------------------------------------------------------------------The specifications of RS232 interface are shown in “Table3-4.

Specification of RS232

interface”.
Table3-4. Specification of RS232 interface
Item

Description or Selection

Terminal

D-sub 9-pin(male, UNC #4-40 screws)

Baud rate

9600 bps / 19200 bps

Terminator“CF”“LF” / “CR” / “LF”

ParityNone/Odd/Even

Stop bit

1/2

Data bit

7/8

Flow control

None/Hardware/Software

3-11

EC750SA

3.3 I/O Terminals

3.3.3 USB connector
Use a commercial (off-the-shelf) USB cable to connect the rear USB connector to a PC.
See “6. REMOTE INTERFACE”, for description of using USB connection for remote control
from a PC.

USB connector

Figure 3-8. USB Connector-------- Notes-------------------------------------------------------------------------------------------------------- The USB cable should be a commercial Type A (male) to Type B (male) cable.
 The use of USB hub may cause a communication failure. It is recommended to use
fully-shield, short cable.
----------------------------------------------------------------------------------------------------------------------------The specifications of USB interface are shown in “Table3-5. Specification of USB interface”.
Table3-5. Specification of USB interface
Item

Description

InterfaceUSB1.1, USBTMC

ID

Already assigned for each device

Terminator

“LF”

3-12

EC750SA

3.3 I/O Terminals

3.3.4 External control I/O
The EC750SA is equipped with an (8-bit) external control I/O connector to enable external control using
digital signal input and status output using digital signals. The connector is a D-sub 25-pin type.

External control I/O
connector

Figure 3-9. External Control I/O Connector
The signals corresponding to the pins in this connector are listed below in “Table3-6 External Control
I/O Connectors”

3-13

EC750SA

3.3 I/O Terminals

Table3-6. External Control I/O Connectors
Pin No.

I/O

Function

Remark

1

OutputPower source on/off status2

OutputOutput on/off status3

OutputLimiter operation Note4

OutputSoftware busy

5

OutputSequence sync output 0

6OutputSequence sync output 1

7

OutputUndefined

8

OutputUndefined

9

GND

10

Input

Undefined

11

Input

Output off

Falling detection

12

Input

Output on

Falling detection

13

Input

Sequence start

Falling detection

14

Input

Sequence stop

Falling detection

15

Input

Sequence hold

Falling detection

16

Input

Sequence branch trigger 0

Falling detection

17

Input

Sequence branch trigger 1

Falling detection

18

GND

19

Output+5 V

20OutputReserved

21

OutputReserved

22

OutputReserved

23

OutputReserved

24

OutputReserved

25

OutputReserved

0: Off
1: On
0: Off
1: On
0: Off
1: On
0: Normal
1: Busy-

50 mA or less

Note When peak current limiter (positive), peak current limiter (negative), RMS current limiter,or output power limiter is operated, it is recognized as a limiter operation on.
External control input and output can be used when external control has been set as enabled.
See “5.6.7 External control input enable/disable setting”.

3-14

EC750SA

3.3 I/O Terminals

3.3.5 External signal input/external sync signal input terminal
When using an externally input signal as the signal source with external synchronization, connect to theexternal signal input/external sync signal input terminals (EXT SIG IN/EXT SYNC IN) on the rear panel.
For this connection, use a coaxial cable with a BNC connector.
The specifications for these external signal input/external sync signal input terminals are listed below.

 Common specifications
Input terminal:

BNC connector (used for external signal input and external
sync signal input)

Input impedance:

10 kΩ

Non-destructive maximum input voltage: ±10 V

 External signal input
Frequency range:

DC to 550 Hz (sine wave)
DC to 100 Hz (other than sine wave)

Gain setting range:

100 V range:

0.0 times to 220.0 times (initial value is 100.0)

200 V range:

0.0 times to 440.0 times (initial value is 200.0)

Gain setting resolution:

0.1 times

Gain accuracy:±5% (DC or 45 Hz to 65 Hz, gain is at initial value, with
rated voltage output, no load)

Phase between input and output:

In-phase

Input voltage range:−2.2 V to +2.2 V

 External synchronization
Synchronization frequency range:

40 Hz to 500 Hz∗External sync signal is not required when line
synchronization is selected.

Input voltage threshold value:

TTL

Minimum pulse width

3 ms

External signal input/
external sync signal input
terminal

Figure 3-10. EXT SIG IN/EXT SYNC IN Terminal

3-15

EC750SA

3.4 Main Operation Example

3.4 Main Operation Example
Main operations are described below in the following order.
 Power-on

3.4.1 Power on/off↓ Set output mode

3.4.2 Setting output mode↓
3.4.3 Setting output voltage range

 Set output voltage range↓
 Set waveform

3.4.4 Setting waveform↓ Set output voltage

3.4.5 Setting output voltage↓
 Set output frequency

3.4.6 Setting output frequency↓
 Use current limiter and setting range limiter

3.4.7 Using limiter functions↓
 Output on

3.4.8 Output on/off↓ Check measured value

3.4.9 Using measurement functions↓
 Output off

3.4.8 Output on/off↓
3.4.1 Power on/off Power-off

3-16

EC750SA

3.4 Main Operation Example

3.4.1 Power on/off
When the POWER switch is set to “|”, the power goes on, and when it is set to “”, the power goes off.

POWER switch

Figure 3-11. POWER Switcha) Power-on
Set the POWER switch to “|”.

Startup screen is displayed.

3-17

EC750SA

3.4 Main Operation Example⇒ Main operations screen is displayed.

Output mode

3.4.2

Output voltage range
Output voltage

3.4.3
3.4.5

Output frequency
Waveform

Limiter function

3.4.6
3.4.4

3.4.7

Select measurement display

3.4.9

Figure 3-12. Example of Main Operations Screen (in AC-INT Mode)
The main operations screen that appears immediately after the power-on shows the samesettings that were displayed the last time the power was turned off. When a newly purchased
product is turned on for the first time, the initial settings (factory settings) are displayed.
⇒⇒

See “3.2 Display and Initial Settings at Power-on”, for description of the initial
settings.
See “4.8 Using Memory Functions”, for description of how to read settings saved tomemory.

⇒See “7. TROUBLESHOOTING”, for a list of warnings and error messages, along withrecommended responses.

b) Power-off
After confirming that the output is off, set the POWER switch to “”.

OUTPUTOUTPUT

Output on

Output off⇒ The power source is cut and turned off.
！

CAUTION• Before turning off the power, make sure the OUTPUT setting is off.

！

CAUTION• Before turning off the power of EC750SA, always finish remote control. If turn off the power during
remote control, it may be caused unconformity to internal memory state.

3-18

EC750SA

3.4 Main Operation Example

3.4.2 Setting output mode
The EC750SA provides the eight output modes listed in Table3-7. The output mode cannot be changed
while output is on. Before changing the output mode, set output to off.
Table3-7. Output Mode List
Operation Signal Source Mode
Mode

Output Mode

Reference

INT(internal)

AC-INT“3.4.2 Setting output mode”

EXT(external)

AC-EXT“4.9 Amplification of External Signal”

AC“4.10 Adding External Signals andInternal Signals ”

ADD
AC-ADD(internal + external)
SYNC(external sync)

AC-SYNC“4.7 Synchronize the Output with
External Signal”

INT(internal)

AC+DC-INT“4.1 Use as a DC Power Source”

EXT(external)

AC+DC-EXT“4.9 Amplification of External Signal”

AC+DC“4.10 Adding External Signals andInternal Signals ”

ADD
AC+DC-ADD(internal + external)
SYNC(external sync)“4.7 Synchronize the Output with
External Signal”

AC+DC-SYNC

Setting to AC-INT mode is described below as an example.

3-19

EC750SA

3.4 Main Operation Example

 Operation steps
Select output mode by selecting

1. Press theorin the SET menu.

key to move the cursor to theicon.
CursorCANCEL2. Press the

ENTER

ENTER

key to display the selection box.

CANCEL3. Press theor

CANCEL4. Press the

ENTER

CANCEL

Selection box

ENTER

key to move the cursor to the mode to be set.

ENTER

key to set the selected mode.

ENTER

3-20

EC750SA

3.4 Main Operation Example

3.4.3 Setting output voltage range
Select 100 V range or 200 V range. The output voltage range cannot be changed while output is on.
The setting range varies according to the output voltage range.
Table3-8. List of Setting Ranges for Various Output Voltage Range

Setting
DC voltage
SIN/SQU
Waveform
ARB1 to 16
Peak current limiter (positive)
Peak current limiter (negative)
RMS current limiter
Positive voltage setting limit
Negative voltage setting limit
External input gain
AC voltage

100 V range−220.0 to +220.0
0.0 to 155.0
0.0 to 440.0+10.0 to +31.5−31.5 to −10.0
1.0 to 10.5
+0.1 to +220.0−220.0 to −0.1
0.0 to 220.0

Setting Range
200 V range−440.0 to +440.0
0.0 to 310.0
0.0 to 880.0+5.0 to +15.8−15.8 to −5.0
1.0 to5.3+0.1 to +440.0−440.0 to −0.1
0.0 to 440.0

Unit
V
Vrms
Vp-p
A
A
A
V
V
times

 Operation steps
To set the output voltage range, select1. Press theorin the SET menu.

key to move the cursor to theicon.
CursorCANCEL

ENTER

3-21

EC750SA

3.4 Main Operation Example

2. Press the

ENTER

key to display the selection box.

Selection box
CANCEL3. Press theor

CANCEL4. Press the

ENTER

ENTER

key to move the cursor to the output voltage range to be selected.

ENTER

key. Then theicon appears in the status window.
Status window

CANCEL

⇒ The

ENTER

icon goes out, then the display will change to the selected output voltage range.

3-22

EC750SA

3.4 Main Operation Example

3.4.4 Setting waveform
The EC750SA allows to select a sine wave, square wave, or arbitrary waveform (16 types in all) as the
waveform to be output, by using the control panel. Arbitrary waveforms are generated using datatransfers via the USB interface.
See “4.6 Output of Arbitrary Waveforms”, for details of arbitrary waveforms.
Table3-9 lists the waveforms that can be selected.
Table3-9. Waveform List
Type

As Shown in Operation Panel
SIN

Sine wave

SQU

Square wave

ARB1 to ARB16

Arbitrary waveform (16 types)

 Operation steps
To select a waveform, select1. Press theor

CANCEL2. Press the

ENTER

in the SET menu.

key to move the cursor to theicon.

CursorENTER

key to display the selection box.

Selection box
CANCEL

ENTER

3-23

EC750SA

3.4 Main Operation Example

3. Press theor

CANCEL4. Press the

ENTER

key to move the cursor to the waveform to be output.

ENTER

key to set the selected waveform.

CANCEL

ENTER

3.4.5 Setting output voltage
For AC-INT mode, the output voltage settings listed below can be selected.
Table3-10. Output Voltage Settings

Output Mode

Setting

AC-INTAC(AC mode)

voltage

100 V range
200 V range

Setting Range

Resolution

SIN/SQU

0.0 to 155.0 Vrms

0.1 Vrms

ARB1 to ARB 16

0.0 to 440.0 Vp-p

0.1 Vp-p

SIN/SQU

0.0 to 310.0 Vrms

0.1 Vrms

ARB1 to ARB 16

0.0 to 880.0 Vp-p

0.1 Vp-p

See “3.4.7 Using limiter functions”, when using a setting range limit for output voltage.
See “5.3.3 Setting output voltage”, for output voltage setting ranges for other output modes.

3-24

EC750SA

3.4 Main Operation Example

 Operation steps
To set the output voltage, set

1. Press theorin the SET menu.

key to move the cursor to theicon.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the modification box.

Modification box

CANCEL3. Press the

ENTER

and

keys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

4. Press the

CANCELor

ENTER

Increase

key to close the modification box.

3-25

EC750SA

3.4 Main Operation Example

3.4.6 Setting output frequency
The AC output frequency can be set in the following range.
Table3-11. Output Frequency Setting
Setting Range

Resolution

Setting Accuracy

1.0 Hz to 550.0 Hz

0.1 Hz±0.01% (1.0 Hz to 550.0 Hz, 23 ±5°C)

See “3.4.7 Using limiter functions”, when using an output frequency setting range limit.
-------- Notes ---------------------------------------------------------------------------------------------------------- If the frequency is set 40 Hz or lower in AC-INT mode, there is a possibility that the output
waveform will be distorted and DC offset will be output.
----------------------------------------------------------------------------------

 Operation steps
To set the output frequency, set

1. Press theorin the SET menu.

key to move the cursor to theicon.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the modification box.

Modification box
CANCEL

ENTER

3-26

EC750SA

3.4 Main Operation Example

3. Press theandkeys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

4. Press the

CANCELor

ENTER

Increase

key to close the modification box.

3-27

EC750SA

3.4 Main Operation Example

3.4.7 Using limiter functionsa) Using current limiter
The EC750SA includes a peak current limiter function and a RMS current limiter function.
Limiter settings are retained separately for 100 V and 200 V ranges.
Setting range limits can be set for output voltage and output frequency.
See “5.3.7 Peak current limiter settings”.
See “5.3.8 RMS current limiter settings”.
Table3-12. Current Limiter Setting Ranges
Setting

Setting Range

Resolution

Initial Value

Peak current
limiter (positive)

100 V range+10.0 A to +31.5 A

0.1 A+31.5 A

200 V range+5.0 A to +15.8 A

0.1 A+15.8 A

Peak current
limiter (negative)

100 V range−31.5 A to −10.0 A

0.1 A−31.5 A

200 V range−15.8 A to −5.0 A

0.1 A−15.8 ARMS current
limiter

100 V range

1.0 A to 10.5 A

0.1 A

10.5 A

200 V range

1.0 A to

0.1 A

5.3 A

5.3 A

For a capacitive load or inductive load, the peak current limiter may not achieve the peak current
value as set, due to overshooting or undershooting the set current value, or variable output current
waveforms while the limiter is operating.
For an inductive load, operation of the limiter can cause the current to vary and, as a result, an output
overvoltage may occur.
！

CAUTION

Note with caution that the peak current limiter may allow overshooting, depending on the load, andtherefore may not achieve the peak current value as set.
For an inductive load, operation of the limiter can cause an output overvoltage, triggering theovervoltage protection function. In this case, the peak current limiter settings (positive andnegative) should be reduced.

！

CAUTION

If the output current or frequency suddenly increases, due to an output short, etc., the limiter
response may not be quick enough, so the output overcurrent protection function may be triggered.

3-28

EC750SA

3.4 Main Operation Example

 Operation steps
Select the icon in the SET menu corresponding to the desired setting, then set a numerical value.
• Peak current limiter (positive):• Peak current limiter (negative):• RMS current limiter:

1. Press theor

CANCEL2. Press the

ENTER

ENTER

,or

or

icon.

Cursorkey to display the modification box.

CANCEL3. Press the

key to move the cursor to the

ENTER

and

Modification box

keys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

4. Press the

CANCELor

ENTER

Increase

key to close the modification box.

3-29

EC750SA

3.4 Main Operation Exampleb) Using setting range limiter
The EC750SA internal mode (AC-INT, AC+DC-INT) and internal + external mode (AC-ADD,
AC+DC-ADD) include setting range limiter functions for output voltage and output frequency.
See “5.5.5 Setting range limiter (LIMIT)”, for details.
Table3-13. Voltage and Frequency Setting Range Limiter
Setting

Setting Range

Resolution

Initial Value

Positive voltage
setting limit

100 V range+0.1 V to +220.0 V

0.1 V+220.0 V

200 V range+0.1 V to +440.0 V

0.1 V+440.0 V

Negative voltage
setting limit

100 V range−220.0 V to−0.1 V

0.1 V−220.0 V

200 V range−440.0 V to−0.1 V

0.1 V−440.0 V

Frequency upper limit setting limit

1.0 Hz to 550.0 Hz

0.1 Hz550.0 Hz

Frequency lower limit setting limit

1.0 Hz to 550.0 Hz

0.1 Hz1.0 Hz Operation steps
The setting range limit is set via the LIMIT screen under the MISC menu

1. Press theor

CANCEL

key to move the cursor to the

.

icon.

ENTER

Cursor

2. Press the

ENTER

Press theCANCEL

key to display the MISC menu.
orto move the cursor key to “LIMIT”.

ENTER

3-30

EC750SA

3.4 Main Operation Example

3. Press the

ENTER

key to display the LIMIT screen.

CANCEL

ENTER

4. Press theor

key to move the cursor to the item to be set.

CursorCANCEL5. Press the

ENTER

ENTER

key to display the modification box.

Modification box

CANCEL6. Press the

ENTER

and

keys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

7. After setting all of the items, press the

Increase

CANCEL

or

3-31

ENTER

key to close the modification box.

EC750SA

3.4 Main Operation Example

3.4.8 Output on/off
OUTPUT

To turn the EC750SA output on or off, simply press thekey.

When output is on, the output on/off LED goes on, and it goes off when the output is off.

OUTPUTOUTPUT

Output off

Output on！

Output on/off LED on

WARNINGTo ensure safety, make sure the power is off before connecting outputs.

！

CAUTION

Before turning off the power, make sure that the output on/off LED is off.

The output on/off setting can be controlled via the MISC menu of the display.
See “5.5.8 Output on/off”.

3-32

EC750SA

3.4 Main Operation Example

3.4.9 Using measurement functions
The EC750SA is equipped with the following measurement functions.
• Voltage (RMS, average DC, peak)• Current (RMS, average DC, peak, peak hold)• Power (effective, reactive, apparent)• Synchronization frequency (external synchronization)• Load power factor• Load crest factor• Harmonic current (50 Hz/60 Hz fundamental, up to 40th harmonics)
Measured values are displayed in the measured value window MEASURE screen, which enables theoutput status to be monitored.
a) Measured value window

Figure 3-13. Example of Measured Value Window (AC-INT Mode)
When a measurement is out of range, “− − − − −” is displayed in the numerical value field.
b) Select measurement display
Select among RMS, AVG, PEAK, or harmonic current as the measured current and voltage values tobe displayed.
⇒

See “4.3 Measurement of Harmonic Current”, for description of harmonic current
measurements.

3-33

EC750SA

3.4 Main Operation Example

 Operation steps
To select a measurement display, select “MEASURE” in the MISC menu

1. Press theor

CANCEL

key to move the cursor to the

.

icon.

ENTER

Cursor

2. Press the

ENTER

Press theor

CANCEL3. Press the

key to display the MISC menu.

ENTER

CANCEL

key to move the cursor to “MEASURE”.

ENTER

key to display the selection box.

ENTER

Selection box

3-34

EC750SA

3.4 Main Operation Example

4. Press theor

CANCEL

key to move the cursor to the desired measurement display.

ENTER

HC1 to HC4 are for measuring harmonic current.
See “4.3 Measurement of Harmonic Current”.
5. Press the

ENTER

key to set the selected measurement display.

Selected measurement display is shown.

CANCEL

ENTER

6. Press the TOP MENU key or CANCEL key to return to the SET menu screen.

TOP
MENU

START

SEQUENCE
STOP

HOLD

LOCAL

3-35

EC750SA

3.5 Output Characteristics

3.5 Output Characteristics
The following charts show output voltage vs. output current of the EC750SA (resistance load, 45 Hz to 65
Hz or DC, typical character).

Output current (Arms)/Maximum output current (Arms) × 100 (%)

Figure 3-14 shows AC output characteristics, and Figure 3-15 shows DC output characteristics.

100.0

75.0

48.4

Maximum output power = 750 VA
Output range: Rated output voltage/Maximum output current-------------------------------------------------------------------------

100 V range: 100 Vrms/10 Arms
200 V range: 200 Vrms/5 Arms

0.0
0.0

75.0

100.0

155.0

Output voltage (Vrms)/Rated output voltage (Vrms) × 100 (%)

Output current (A)/Maximum output current (A) × 100 (%)

Figure 3-14. Output Voltage (AC) vs. Output Current Characteristics(AC-INT)

100.0

75.0

Maximum output power = 750 W
34.1
Output range: Rated output voltage/Maximum output current-------------------------------------------------------------------------

100 V range: 100 V/10 A
200 V range: 200 V/5 A

0.0
0.0

75.0

100.0

200.0

220.0

Output voltage (V)/Rated output voltage (V) × 100 (%)

Figure 3-15. Output Voltage (DC) vs. Output Current Characteristics(AC+DC-INT, AC=0)3-36EC750SA4. ADVANCED OPERATION EXAMPLE

4.1

Use as a DC Power Source ............................................. 4-2

4.1.1 Connecting output terminal to load during DC output . 4-2
4.1.2 Selecting an output mode (AC+DC-INT mode) .......... 4-4
4.1.3 Setting the output voltage range ................................ 4-5
4.1.4 Setting the output voltage .......................................... 4-7
4.1.5 Setting output frequency of superimposed AC ........... 4-9
4.1.6 Setting superimposed AC waveform ........................ 4-10
4.1.7 Using the measurement function ............................... 4-11
4.2

Measurement of Inrush Current ..................................... 4-15

4.2.1 Inrush current ........................................................... 4-15
4.2.2 Set phase at output on ............................................. 4-16
4.2.3 Set measurement display to peak value ................... 4-17
4.2.4 Reset the peak current hold value ............................ 4-18
4.3

Measurement of Harmonic Current ................................ 4-20

4.4

Using the Sequence Function ........................................ 4-22

4.4.1 Sequence operations ............................................... 4-22
4.4.2 Sequence settings .................................................... 4-29
4.4.3 Programming sequences .......................................... 4-31
4.4.4 Control of sequence operations ............................... 4-37
4.4.5 Clear sequence memory .......................................... 4-39
4.4.6 Example of sequence operation settings .................. 4-40
4.4.7 Execution of sequence operations ........................... 4-44
4.5

Control Using External Control I/O Connector ............... 4-48

4.6

Output of Arbitrary Waveforms ....................................... 4-49

4.7

Synchronize the Output with External Signal ................. 4-51

4.7.1 External signal synchronization ................................ 4-52
4.7.2 Line synchronization ................................................ 4-54
4.8

Using Memory Functions ............................................... 4-55

4.9

Amplification of External Signal ..................................... 4-58

4.10 Adding External Signals and Internal Signals ................ 4-62

4-1

EC750SA

4.1 Use as a DC Power Source

4.1 Use as a DC Power Source
When using the EC750SA as a DC voltage source, select DC - Internal signal mode (AC+DC-INT), thenenter the settings listed in Table4-1.
AC components (sine wave, square wave, and arbitrary waveform) can be superimposed on the DC powersource.
A protection diode may be required to be connected, depending on the load, such as a capacitor or
inductor.
Table4-1. Panel Settings When Using EC750SA as a DC Power Source

DC voltage

Setting
100 V range
200 V range
100 V range

AC voltage
200 V range
AC voltage frequency
Phase when output is on

Setting Range−220.0 to +220.0 V−440.0 to +440.0 V
SIN/SQU
0.0 to 155.0 Vrms
ARB1 to ARB16
0.0 to 440.0 Vp-p
SIN/SQU
0.0 to 310.0 Vrms
ARB1 to ARB16
0.0 to 880.0 Vp-p
1.0 to 550.0 Hz
0.0 to 359.9°

Resolution
0.1 V
0.1 V
0.1 Vrms
0.1 Vp-p0.1 Vrms
0.1 Vp-p0.1 Hz0.1°

Initial Value
0.0 V
0.0 V
0.0 Vrms
0.0 Vp-p0.0 Vrms
0.0 Vp-p50.0 Hz
0.0°

The unit for AC voltage settings differs according to the AC voltage waveform setting.

4.1.1 Connecting output terminal to load during DC output
Use the output terminal on the rear panel when outputting DC+AC or only DC from the EC750SA.
If the load is a capacitor or inductive load, connect a diode for protection that meets the following
specifications between the output terminal of the EC750SA and the load.
• Maximum reverse voltage:

600 V or higher• Maximum forward current: 15 A or more (100 V range), 7.5 A or more (200 V range)a) Capacitive load such as capacitor (about 50 µF or more) and DC-DC converter
When a capacitive load is charged, the greater the voltage changes, the more the charge
current becomes. Overshoot may be generated in the output currents depending on the load,
even if the peak current limiter of the EC750SA operates, thus turning off the output due toovercurrent protection.
To avoid this, gradually lower the set voltage so that decrease of the voltage changes per
certain unit time or use the sweep function of the sequence.
A block diode is required to prevent current from flowing from the load to the output terminalof the EC750SA even if the output voltage is lowered. Connect the diode and the load seriallyas shown in Figure 4-1.

4-2

EC750SA

4.1 Use as a DC Power Source

Once a diode has been connected, a load that does not consume power keeps its voltage
charged. The voltage of the load may be slightly higher due to the overshoot voltage andshould be carefully monitored.

EC750SA

Block diode

Capacitor

Figure 4-1. Connection of Block Diodeb) Inductive load such as inductor
An inductive load generates a back EMF when current suddenly stops flowing, such as when
the output is turned off. A backflow diode is required to absorb the back EMF.
Connect a backflow diode in parallel with the load, as shown in Figure 4-2.

EC750SA

Backflow diode

Inductor

Figure 4-2. Connection of Backflow Diode

4-3

EC750SA

4.1 Use as a DC Power Source

4.1.2 Selecting an output mode (AC+DC-INT mode)
To select an output mode, selectin the SET menu.

 Operation steps
1. Press theor

key to move the cursor to theicon.
CursorCANCEL2. Press the

ENTER

CANCEL3. Press the

ENTER

key to display the selection box.

Selection box

ENTER

or

key to move the cursor to “AC+DC-INT”.

CursorCANCEL4. Press the

ENTER

CANCELENTER

key to set the AC+DC-INT mode.

ENTER

4-4

EC750SA

4.1 Use as a DC Power Source

4.1.3 Setting the output voltage range
Select 100 V or 200 V as the output voltage range.
As is shown in Table4-2, the range that can be set for the output voltage differs according to theselected output voltage range.
Table4-2. Setting Range Options for Various Output Voltage Ranges

Setting
DC voltage
SIN/SQU
ARB1 to ARB16
Peak current limiter (positive)
Peak current limiter (negative)
RMS current limiter
Positive voltage setting limit
Negative voltage setting limit
External input gain
AC voltage

100 V range-220.0 to +220.0
0.0 to 155.0
0.0 to 440.0+10.0 to +31.5-31.5 to -10.0
1.0 to 10.5
+0.1 to +220.0-220.0 to -0.1
0.0 to 220.0

Setting range
200 V range-440.0 to +440.0
0.0 to 310.0
0.0 to 880.0+5.0 to +15.8-15.8 to -5.0
1.0 to5.3+0.1 to +440.0-440.0 to-0.1
0.0 to 440.0

Unit
V
Vrms
Vp-p
A
A
A
V
V
times

in the SET menu.
To select an output voltage range, selectThe output voltage range cannot be changed when output is on.

 Operation steps
1. Press theor

key to move the cursor to theicon.
CursorCANCEL2. Press the

ENTER

ENTER

key to display the selection box.
Selection box

CANCEL

ENTER

4-5

EC750SA

4.1 Use as a DC Power Source

3. Press theor

CANCEL4. Press the

ENTER

CANCEL⇒ The

key to move the cursor to 100 V or 200 V.

ENTER

key. Then theicon appears in the status window.

ENTER

icon goes out, then the output voltage range changes to the selected range.

4-6

EC750SA

4.1 Use as a DC Power Source

4.1.4 Setting the output voltage
The ranges that can be set are listed below.
Table4-3. Output Voltage Setting Ranges When AC+DC Mode Is Selected

DC voltage

Setting
100 V range
200 V range
SIN/SQU
ARB1 to ARB16
SIN/SQU
ARB1 to ARB16

100 V range
AC voltage
200 V range

Setting range−220.0 to +220.0 V−440.0 to +440.0 V
0.0 to 155.0 Vrms
0.0 to 440.0 Vp-p
0.0 to 310.0 Vrms
0.0 to 880.0 Vp-p

resolution
0.1 V
0.1 V
0.1 Vrms
0.1 Vp-p0.1 Vrms
0.1 Vp-p

Output can be set so that AC voltage is superimposed on DC voltage.
The unit for AC voltage settings differs according to the AC voltage waveform setting.
When the selected AC voltage waveform is SIN/SQU, the AC voltage setting is in Vrms units, andwhen it is ARB1 to ARB16, the setting is in Vp-p units.
To select an output voltage, select“DC voltage” or“AC voltage” in the SET menu, then set

a numerical value.

 Operation steps

1. Press theor

key to move the cursor to the

or

icon.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the modification box.

Modification box
CANCEL

ENTER

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EC750SA

4.1 Use as a DC Power Source

3. Press theandkeys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

4. Press the

CANCELor

ENTER

Increase

key to close the modification box.

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EC750SA

4.1 Use as a DC Power Source

4.1.5 Setting output frequency of superimposed AC
To set the output frequency, set a numerical value underin the SET menu.

 Operation steps
1. Press theor

key to move the cursor to theicon.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the modification box.

Modification box
CANCEL3. Press the

ENTER

and

keys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

4. Press the

CANCELor

ENTER

Increase

key to close the modification box.

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EC750SA

4.1 Use as a DC Power Source

4.1.6 Setting superimposed AC waveform
Selects among 16 types of sine waves (SIN), square waves (SQU), and arbitrary waveforms (ARB).
Arbitrary waveforms are generated using data transfers via the USB interface.
See “4.6 Output of Arbitrary Waveforms”, for details of arbitrary waveforms.
To select a waveform, selectin the SET menu.

 Operation steps
1. Press theor

CANCEL2. Press the

ENTER

CANCEL3. Press the

CANCEL

key to move the cursor to the

ENTER

icon.

Cursorkey to display the selection box.

Selection box

ENTER

or

key to move the cursor to the waveform to be output.

ENTER

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4.1 Use as a DC Power Source

4. Press the

ENTER

CANCEL

key to set the selected waveform.

ENTER

4.1.7 Using the measurement function
Measured values are displayed in the measured value window MEASURE screen, which enables theoutput status to be monitored.

a) Measured value window

Figure 4-3. Example of Measured Value Window (During AC+DC Mode)
When a measurement is out of range, “− − − − −” is displayed in the numerical value field.
Select “AVG” to measure DC component only, or select “RMS” to measure the superimposedvalue of DC and AC components.
The measurement values of peak voltage, peak current and harmonic current are reference values.

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EC750SA

4.1 Use as a DC Power Sourceb) Calculation method of the measurement values
Output voltage and current are sampled and A/D converted at 50 kS/s in general or at 5 kS/s whena sequence program is running. The frequency bandwidth of each analog circuit from a voltage orcurrent point to the A/D converter is 50 kHz.
RMS, average and peak values of voltage or current and active power values are calculated withfollowing formulas and sampled values over integer multiples of their periods nearest to 100 ms.
The following values are used as the periods: frequency setting values in INT/ADD modes,
synchronization frequency measurements in SYNC modes, and fixed values to 100 ms in EXT
modes or when the frequency is lower than 10 Hz in any mode.
RMS voltage: Vrms =1 N −1
2
× [V (n )]N n =0∑DC average voltage: Varg =RMS current: I rms =

N −1

∑

1
× V (n )
N n=0

N −1

∑

1
2
× [I (n )]N n =0DC average current: I arg =

N −1

∑

1
×
I (n )
N n =0Max voltage: V peak += MAX [V (n )]Min voltage: V peak −= MIN [V (n )]Max current: I peak += MAX [I (n )]Min current： I peak −= MIN [I (n )]Active power: W =

N −1

∑

1
× [V (n ) × I (n )]N n=0However, V (n ) , I (n ) : sample output voltage/current measurement data
N : Number of samples.

Apparent power, reactive power, crest factor and peak current hold are calculated from equations
below using previous calculated values.
Reactive power: var =Apparent power: VA = Vrms × I rms
Power factor: PF = W
Crest factor: CF =(VA)2 − W 2

VA(

MAX I peak + , I peak −

)
I rms

(

Current peak hold: I ph hold = MAX I peak + , I peak −

4-12

)

EC750SA

4.1 Use as a DC Power Sourcec) Select measurement display
Select one form among RMS, AVG, or PEAK as the measured current and voltage values to be
displayed.
To select a measurement display, select “MEASURE” in the MISC menu.

 Operation steps
1. Press the

CANCELor

key to move the cursor to the

icon.

ENTER

Cursor

2. Press the

ENTER

Press theCANCEL3. Press the

CANCEL

key to display the MISC menu.
orkey to move the cursor to “MEASURE”.

ENTER

ENTER

key to display the selection box.

ENTER

Selection box

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4.1 Use as a DC Power Source

4. Press theor

key to move the cursor to the desired measurement display.

Select “AVG” to measure only the DC power source.

CANCEL

ENTER

5. Press the

CANCELENTER

key to set the selected measurement display.

ENTER

Although harmonic current measurement (HC1 to HC4) is also displayed in the selection box,
this cannot be selected when in AC+DC mode. When in AC internal mode (AC-INT),
harmonic current measurement can be selected only when the frequency setting is 50.0 Hz or
60.0 Hz.
See “4.3 Measurement of Harmonic Current”.
6. Press the TOP MENU key or CANCEL key to return to the SET menu screen.

TOP
MENU

START

SEQUENCE
STOP

HOLD

LOCAL

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EC750SA

4.2 Measurement of Inrush Current

4.2 Measurement of Inrush Current
4.2.1 Inrush current
In such an electrical product as contains a capacitor input type rectifier circuit for the input power line,
a current that is larger than the rated current may flow for a short time immediately after the powersource switch is turned on. This current is called an “inrush current.”
If the power source is not able to supply such a large current, enough power is not supplied to the
product, and sometimes it does not start in the worst case.
On the other hand, when such a large current passes through the power source line, the supply voltage
is likely to decrease because of the voltage drop at the line impedance. There exists a standard to limit
this effect within a certain level.
Such a product should be driven by a power source with enough supply capacity∗ Example of an inrush current
An electric drill(rated 100 V AC/350 W)
Upper: Voltage (100 V/div)
Lower: Inrush current (10 A/div)
Even in a small electric drill, an inrush current of 14 Apk flows right after the power source is turned
on. Since the rated current is 3.5 A, this represents a fourfold increase in the current flow.
The EC750SA can supply four times as a large peaked current as the maximum output current
supporting such a usage. There is no need to use a power source with an extra large capacity in order tosupply the inrush current (for a capacitor input circuit of CF = 4 or less).
The initial phase of the output AC voltage is adjustable from 0.0° to 359.9° (in 0.1° steps), so the user
can monitor how the current inrushes in the load under various phase conditions. The peak current
hold measurement function enables the measurement of the maximum peak value for the current
flowing at that time. The measurement value of the peak current is reference value.
When measuring the inrush current, set the peak current limiter to the maximum value. If the limiter
setting is lowered, the inrush current measurement may be incorrect.

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4.2 Measurement of Inrush Current

4.2.2 Set phase at output on
To set the phase at output on, select“Phase at output on” in the SET menu and set a numericalvalue.
Before changing the phase at output on, set output off.

 Operation steps
1. Press theor

CANCEL2. Press the

key to move the cursor to the

Cursor

ENTER

ENTER

icon.

key to display the modification box.

Modification box
CANCEL3. Press the

ENTER

and

keys to move the cursor to the digit to be changed, turn the MODIFY dialand set a numerical value. The set value will be reflected in output immediately.

Decrease

4. Press the

CANCELor

ENTER

Increase

key to close the modification box.

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4.2 Measurement of Inrush Current

4.2.3 Set measurement display to peak value
Set the displayed current measurement value to the peak value (PEAK).
To change the displayed current measurement value, select “MEASURE” in the MISC menu.

 Operation steps
1. Press the

CANCELor

key to move the cursor to theicon, then press the

ENTER

key.

ENTER

Cursor⇒ The MISC menu is displayed.

2. Press theor

key to move the cursor to “MEASURE”, then press the

ENTER

key.

⇒ The selection box is displayed.

CANCEL

ENTER

Selection box

3. Press theor

key to move the cursor to “PEAK”, then press the

ENTER

key.

⇒ This sets the measurement display to the peak value (PEAK).

CANCEL

ENTER

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EC750SA

4.2 Measurement of Inrush Current

4. Press the TOP MENU key or the CANCEL key to return to the SET menu screen.
⇒ The measured value window shows the peak value set in the measurement display.
Peak value
Peak hold value

TOP
MENU

START

SEQUENCE
STOP

HOLD

LOCAL

4.2.4 Reset the peak current hold value
The EC750SA includes a function that resets the peak current hold value.
A reset sets the peak current hold value to 0 Apk, and the maximum peak value of current is updated
until the next reset is performed.
The current peak value is reset automatically at power-on.
To reset the peak current hold value, select “MEASURE” in the MISC menu.

 Operation steps
1. Press the

CANCELor

key to move the cursor to theicon, then press the

ENTER

key.

ENTER

Cursor⇒ The MISC menu is displayed.

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4.2 Measurement of Inrush Current

2. Press theor

key to move the cursor to “RESET Ipkh…”, then press the

ENTER

key.

⇒ The EXEC box is displayed.

CANCELEXEC box

ENTER

3. When “EXEC” is displayed, press the

ENTER

key.

⇒ The peak current hold value is reset.

CANCEL

ENTER

4. Press the TOP MENU key or CANCEL key to return to the SET menu screen.
⇒ The peak current hold value shown in measured value window becomes 0 Apk.

TOP
MENU

START

SEQUENCE
STOP

HOLD

LOCAL

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EC750SA

4.3 Measurement of Harmonic Current

4.3 Measurement of Harmonic Current
Switching power sources are widely used in both consumer and industrial electrical products. The
capacitor input type rectifier circuits that are used with such input power lines have disadvantages such as
significant distortion of input current and a large amount of harmonic current. When a large amount of thiscurrent flows in the power source line, the equipment may experience operation faults, such as voltage
distortion, which can cause the transformer to overheat, possibly resulting in a hazardous accident.
The EC750SA includes a function for measuring harmonic current. This measurement does not conformto the IEC or other standards.
This measurement can be performed only in AC-INT mode and when the fundamental wave (panel
frequency setting) is either 50 Hz or 60 Hz. Absolute values of harmonic current in RMS and theirpercentages to the fundamental are displayed up to the 40th harmonics (2 kHz at 50 Hz fundamental).
The measurement value of harmonic current is reference value.
When harmonic current measurement is selected, RMS value, average DC, and peak value measurements
are not performed. If RMS value, average DC, or peak value has been set, harmonic current measurement
is not performed.
a) Changing to harmonic measurement window
To view the harmonic measurement window, select “MEASURE” in the MISC menu.

 Operation steps
1. Press the

CANCELor

key to move the cursor to theENTER

icon, then press the

key.

ENTER

Cursor⇒ The MISC menu is displayed.
ENTER

2. Press theor

key to move the cursor to “MEASURE”, then press the

key.

⇒ The selection box is displayed.

CANCEL

ENTER

Selection box

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EC750SA

4.3 Measurement of Harmonic Current

3. Press the
the

ENTER

or

key to move the cursor to the harmonic order to be displayed, then press

key.

CANCEL

ENTER

When HC1 to HC4 have been selected as the displayed measurements, the following harmonic
current measured values are displayed.
The displayed harmonic order (XXth) changes according to these ranges, and 10 lines ofmeasurement data are displayed in each range.
HC1: 1st to 10th
HC2: 11th to 20th
HC3: 21st to 30th
HC4: 31st to 40th

Figure 4-4. Example of Harmonic Measurement Window Display

4. Press the
5. Press theor

key to switch the HC1, HC2, HC3, and HC4 screens.

CANCEL

key to end harmonic measurement and return to the TOP MENU (normal display).

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EC750SA

4.4 Using the Sequence Function

4.4 Using the Sequence Function
4.4.1 Sequence operations
When the sequence function of the EC750SA is used, the pattern to be output can be freely programmed.
For example, if a series of voltage change patterns that will be used in voltage variation tests for car
electronics are programmed in advance, the output will change according to the sequence, so the test canbe completed in one series of operations.
In the sequence operation programming, DC, sine waves, and square waves, which are built in theEC750SA, and arbitrary waveform (16 types) captured via the USB interface is able to use. Maximum
step number is 255 (minimum step time is 0.1 ms). In each step, waveform, level, and duration time can be
set and constant/keep/sweep can be chosen. In addition, sequences can be repeated from 1 to 999 times (orcontinuously). The EC750SA is also equipped with other functions, such as for branching to a specified
step during a sequence operation, and for starting, stopping, or holding a sequence operation.
Data is saved to sequence memory automatically.
These sequence functions can be used in AC-INT mode or AC+DC-INT mode.
Number of sequences: Retained for each operation mode (AC/AC+DC) and each output voltage
range (100 V/200 V).
Number of steps:

1 to 255 (per sequence)

Step time:

0.1 ms to 999.9999 s (resolution 0.1 ms or 0.0001 s)

Operations within step: Constant, keep, or linear sweep
Parameter:

DC voltageNote, AC voltageNote, frequency, waveform, phase (start, end), step
synchronized output (2 bits)

Jump times:

1 to 999 or infinite

Sequence control:

Start:Starts a sequence.

Stop:

Stops a sequence.

Hold:

Maintains current settings. This is restarted when asequence is started.

Branch:Note

Branches to the specified step.

The setting ranges for AC voltage and DC voltage are determined by the output voltage ranges
set when editing the sequence data.
Sequence control cannot be executed when the output is off.

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EC750SA

4.4 Using the Sequence Functiona) Sequence
A sequence is comprised of a combination of at least two steps (the minimum unit is one step).
b) Step
Step execution parameters and step transition parameters are specified for each step. When sequence
execution is not performed (i.e., during normal output mode), these parameters are specified in thesame way. Thereafter, the normal output mode is called normal output step. In the descriptions below,
the step parameters are enclosed in brackets ([ ]).
The step execution parameters specify the output and related actions in each step.
Table4-4. Step Execution Parameters[Output parameters][Step operation types]

Note• DC voltage• AC voltage• Frequency• Waveform (SIN/SQU/ARB1 to ARB16)• Phase (start phase)• Step synchronized output
The following parameters are provided to specify actions related to output at
each step.
• Constant (CONST: The values specified by output parameters are output.)• Sweep (SWEEP: A linear sweep is performed from the previous stepend value to the value specified by the output
parameter, using the specified step time.)• Keep (KEEPNote: The previous step end value is output.)

When the [step operation type] is KEEP, the [output parameter] setting is ignored.

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EC750SA

4.4 Using the Sequence Function

The step transition parameters specify the next step and its timing.
Table4-5. Step Transition Parameters[Step time][Step end phase][Step end]

[Jump step][Jump times][Branch step]

Specified in time
Sets step end phase as enabled or disabled.
The following parameters are provided to specify the action at the end of thestep.
• Continue sequence (CONT)• Hold (HOLD)• Idle (STOP)
The following parameters are provided to specify the destination step when ajump occurs after ending the current step.
• Jump to an arbitrary number step (1 to 255)
• Jump to the next number step (0)The following parameters set a loop for jumping to the step specified by [jumpstep] the specified number of times.
The following parameters are provided to specify the jump times.
• Specified number (1 to 999)
• Infinite times (0)The following parameters are provided to specify the destination step forbranch control.
• Change to arbitrary step number (1 to 255)
• Continue step processing without changing (0)When start is commanded during normal output while in idle mode, step 1 is executed, then the step jumps
according to the specified sequence.
If the [jump step] has not been specified (= 0), the step jumps according to the sequence of step numbers,
but when the [jump step] has been specified (= 1 to 255), the step jumps to the step specified by thatparameter.
A step ends when the time specified by the [step time] has elapsed. If the [step end phase] has been
specified as enabled, the step ends when the [step end phase] value becomes (0°) after the [step time] haselapsed.
If both [step end] and [jump step] have been specified, the [step end] specification takes priority.

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EC750SA

4.4 Using the Sequence Function

An example of basic step transitions is shown below.
Output parameters
Steps 1, 2

Step 3

Normal output
step

Step 1

Step 2Time

Step 3<START>

Figure 4-5. Example of Basic Step Transitionsc) Sequence mode
Figure 4-6 shows a mode transition diagram for sequence operations.

Output on

Idle mode(normal output)<Start><Stop><Stop><Start>Run mode(sequence
execution)

Hold mode(pause)<Hold>

Figure 4-6. Block Diagram of Sequence Mode Transitions----------- Notes ---------------------------------------------------------------------------------------------------- Modes also change according to the [step end] specification.
----------------------------------------------------------------------------------------------------------------------------Table4-6. Sequence Modes
Idle mode
Run mode
Hold mode

Mode during normal output.
Mode during sequence execution.
Sequence pause mode.
Maintains output at time when <Hold> was set.

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EC750SA

4.4 Using the Sequence Functiond) Sequence control
The following describes how sequence operations are controlled. Sequence control operations areindicated in triangular brackets (< >).
Table4-7. Sequence Control<Start><Hold><Stop><Branch>Sets Run mode.
When changing from Idle mode, the operation goes to step 1 when <Start> is set,
and the sequence is started.
When changing from Hold mode, the sequence is resumed from where it was
stopped when <Hold> was set.
When <Hold> mode is set by the [step end] parameter, the sequence is resumed at
the step specified by [jump step] when <Start> is set.
Changes from Run mode to Hold mode.
Changes to Idle mode.
Immediately changes to normal output step.
At that time, the values when <Stop> occurred are retained to the normal output step
[output parameter].
If it is tried to set the output voltage at <Stop> to exceed the setting range limit, thenthe setting will change to 0 V. If it is tried to set the frequency out of the setting
range limit, then the setting will change to the lower limit of the setting range. The
output will turn off in these cases.
Changes to the step specified by [branch step].
Changes from the output at the time when <Branch> occurred to the [branch step].

Step 2 settings• Final value• Step time

Output parameter<Hold><Start>Step 1

Step 2

Step 3Time

Figure 4-7. Example of Sequence Operation from Hold Mode to <Start>

Output parameter<Branch>Step 2 settings• Final value• Step time
• Branch step 5

Step 5 settings• Final value from previous step is used

Step 1

Step 2

Step 5Time

Figure 4-8. Example of Sequence Operation at <Branch>

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EC750SA

4.4 Using the Sequence Functione) Sequence loop
Either an entire sequence or a block of any number of steps within a sequence can be used as asequence loop. The loop is implemented based on the [jump step] and [jump times] parametersspecified for each step. The jump counter, which counts the number of jumps, functions within eachstep to retain a count, so multiple loops can be implemented.
Figure 4-9 below illustrates the loop specification method and the step transitions.

Step 4• [jump step]0• [jump times]

NoCareSpecified times (10 times)changes to [jump step]

Step 5• [jump step]0• [jump times] NoCare

Changes to next step,after specified times(10 times) jump

Step 6• [jump step]

5• [jump times] 10

Specified times (3 times)changes to [jump step]

Step7• [jump step]

4• [jump times] 3

Figure 4-9. Loop Specification Method and Step Transition Example----------- Notes ---------------------------------------------------------------------------------------------------- [jump times] indicates the number of jumps. Consequently, loop times = jump times + 1.
 In the example above, 10 jump times are specified for Step 6, so Step 5 and Step 6 are
executed 11 times.
-----------------------------------------------------------------------------------------------------------------------------

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EC750SA

4.4 Using the Sequence Functionf) Step synchronized output
The code that is specified in the step being executed is output to the external control I/O connector.
However, “L” is output during a normal output step.

Step synchronized output

H
L[Step synchronized output]

Step 1

Step 2

Step 3

Step 4

Step 5

L

H

L

L

H

Time

Figure 4-10. Example of Step Synchronized Outputg) Step end phase setting
When the step end phase is set as enabled, the step execution time is as described below.
The step execution time = Set step time + Time for superimposed AC phase to become 0°
After the set step time elapses, the setting for that step is retained in the subsequent operation.

Set value isretained.
Value set for this step

SWEEP

Wait time for
0° phase

Time set by [step time]

Figure 4-11. Sequence Operation during Wait for Phase 0°

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EC750SA

4.4 Using the Sequence Function

4.4.2 Sequence settings
Sequence settings are made as described below.
• Input per step via control panel• Programmed from PC, with remote interface transfer to EC750SA• Sequence data is edited and transferred using accompanying control software
See “4.4.3 Programming sequences” below, for further description of the program messages
for sequence operations.
See the control software user’s manual, for description of the control software.

The operations on the control panel are described below.

 Operation steps
To display the sequence menu, select “SEQUENCE” in the MISC menu

1. Press theor

CANCEL

key to move the cursor to the

.

icon.

ENTER

Cursor

2. Press the

ENTER

Press theCANCEL

key to display the MISC menu.
orkey to move the cursor to “SEQUENCE”.

ENTER

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EC750SA

4.4 Using the Sequence Function

3. Press the

ENTER

CANCEL4. Press the

key to display the SEQUENCE screen.

ENTER

or

key to select the operation to be performed.

• To control sequence operations: select “CONTROL…”.
(See “4.4.4 Control of sequence operations”.)

Note This cannot be selected when output is off.
• To program a sequence: Select “PROGRAM”.
(

See “4.4.3 Programming sequences”.)• To control sequence memory: Select “MEMORY…”.
(See “4.4.5 Clear sequence memory”.)

CANCEL5. Press the

ENTER

CANCELENTER

key to display the desired screen .

ENTER

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EC750SA

4.4 Using the Sequence Function

4.4.3

Programming sequences

When “PROGRAM” is selected in the SEQUENCE screen, the PROGRAM screen is displayed. The
sequence is programmed according to the various settings in the PROGRAM screen.
To change to the SEQUENCE screen, the output mode must first be switched to AC-INT or AC+DC-INT.
Enter step settings per step.
Table4-8 to Table4-10 list the setting items in the PROGRAM screen.

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4.4 Using the Sequence Function

Table4-8. Setting Items in PROGRAM Screen (1/3)
Setting Name

Item

STEP

Step number

TIME

Step time

DC voltage value

DC VOLT(AC+DC-INT
only)
DC operation typeAC voltage value

AC VOLTAC operation typeOperation
Specifies the step number to be set.
Setting range: 1 to 255
Specifies the continuation time for the specified step.
Setting range:
0.0001 s to 999.9999 s
Setting resolution: 0.0001 s (= 0.1 ms)∗ The time unit can be switched between “s” and “ms” via
the SYSTEM menu “TIME UNIT” setting.
See “5.6.5 Time unit setting”.
Sets the DC voltage value for AC+DC mode.
The setting range is determined by the range setting used
when editing sequence data.
Setting range: 100 V range: −220.0 V to +220.0 V
200 V range: −440.0 V to +440.0 V
Setting resolution: 0.1 V
Sets the method used to change to the specified DC voltage
value.
Select one of the following three options.
• CONST: Output specified value• KEEP:
Output value at end of previous step
• SWEEP: Start by outputting value at end of previous
step, then perform a linear sweep to output the
specified value at the end of the current step
Sets the AC voltage value.
The setting range is determined by the range setting enteredwhen editing the sequence data.
Setting range: 100 V range: 0.0 Vrms to 155.0 Vrms
0.0 Vp-p to 440.0 Vp-p
200 V range: 0.0 Vrms to 310.0 Vrms
0.0 Vp-p to 880.0 Vp-p
Setting resolution: 0.1 Vrms/0.1 Vp-p
∗ The voltage value can be set as “Vp-p” only whenarbitrary waveform has been selected.
Sets the method used to change to the specified AC voltage
value.
Select one of the following three options.
• CONST: Output specified value• KEEP:
Output value at end of previous step
• SWEEP: Start by outputting value at end of previous
step, then perform a linear sweep to output the
specified value at the end of the current step

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4.4 Using the Sequence Function

Table4-9. Setting Items in PROGRAM Screen (2/3)
Setting Name

Item
AC frequency

FREQ
AC frequency
operation type

Waveform
WAVE

Waveform operation
type

Phase
PHS
Phase operation type

Step synchronizedoutputSYNC CODE

Step synchronizedoutput operation type

Step end phaseenable/disable
STOP PHS
Step end phase

Operation
Sets the AC frequency.
Setting range:
1.0 Hz to 550.0 Hz
Setting resolution: 0.1 Hz
Sets the method used to change to the specified frequency.
Select one of the following three options.
• CONST: Output specified value• KEEP:
Output value at end of previous step
• SWEEP: Start by outputting value at end of previous
step, then perform a linear sweep to output the
specified value at the end of the current step
Selects arbitrary waveform to be output.
Setting range: SIN/SQU/ARB1 to ARB16
Sets the method used to change to the specified waveform.
Select one of the following two options.
• CONST: Output specified waveform• KEEP:
Output previous step waveform
Sets output initial phase.
Setting range:
0.0° to 359.9°
Setting resolution: 0.1°
Sets the method used to change to the specified phase.
Select one of the following two options.
• CONST: Output specified phase• KEEP:
Output last step phase
This sets the code (2 bits) to be output in sync with step
execution. The sequence step transitions can checked bymonitoring the step synchronized output.
Bit 0 is output from pin 5 (DOUT5) of the external control
I/O connector and bit 1 is output from pin 6 (DOUT6).
Select one of the following four types of step synchronizedoutput (the H/L are displayed in the order “bit 1, bit 0”).
During Idle mode, these values are “LL”.
• LL
• LH
• HL
• HH
Specifies the output method for step synchronized output.
Select one of the following two options.
• CONST: Output specified code
• KEEP:
Output same code as at previous step
Specifies step end phase as enabled or disabled. Select oneof the following two options.
• DISABLE (phase depends on step time)• ENABLE
Sets step end phase.
Setting range:
0.0° to 359.9°
Setting resolution: 0.1°

4-33EC750SA

4.4 Using the Sequence Function

Table4-10. Setting Items in PROGRAM Screen (3/3)
Setting Name

Item

STEP TERM

Step end

JUMP STEP

Jump step

JUMP NUM

Jump times

BRANCH0

Branch step 0

BRANCH1

Branch step 1

Operation
Sets operation after end of step.
Select one of the following three options.
• CONT: Sequence continuation• STOP:
Change to Idle mode
• HOLD: Change to Hold mode
Sets the step number to jump to after the end of theprevious step.
• 0:
Continue to next step number• 1 to 255: Jump to specified step number
Sets the number of times to execute the jump operation
specified by JUMP STEP.
• 0:
Infinite times jump
• 1 to 999: Specified times jump
Sets the step number to jump to when trigger input has
occurred.
Two types of branch steps can be set: BRANCH0 and
BRANCH1.
[Command example]
When a STOP is set after a small number of sweeps at thejump destination step, it enables uses where there is asafe region for saving data if necessary.
• 0:
Branch disabled• 1 to 255: Jump to specified step number

The operation steps for each of the setting items in the PROGRAM screen are described below.

 Operation step <1>
The settings for step number (STEP), step time (TIME), DC voltage (DC VOLT, AC+DC mode only),
AC voltage (AC VOLT), AC frequency (FREQ), phase (PHS), step end phase (STOP PHS), jump step
(JUMP STEP), jump times (JUMP NUM), and branch (BRANCH0/BRANCH1) are made by entering
numerical values for various items in the order described below.
The example described below is when entering the setting for step time (TIME).

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EC750SA

4.4 Using the Sequence Function

1. Open the SEQUENCE screen and display the PROGRAM screen.
See “4.4.2 Sequence settings”, for steps for displaying the PROGRAM screen.

2. Press theor

key to move the cursor to “TIME”.

CursorCANCEL3. Press the

ENTER

ENTER

key to display the modification box.
Modification box

CANCEL4. Press the

ENTER

and

keys to move the cursor to the digit to be changed, turn the MODIFY dial andset a numerical value. The set value will be reflected in output immediately.

Decrease

Increase

5. Use these steps to set all columns.

6. After setting all of the columns, press the

CANCEL

4-35

or

ENTER

key to close the modification box.

EC750SA

4.4 Using the Sequence Function

 Operation step <2>
The settings for DC voltage operation type (AC+DC mode only), AC voltage operation type,
frequency operation type, waveform (WAVE), waveform operation type, phase operation type, step
synchronized output (SYNC CODE), step synchronized output operation type, step end phaseenable/disable (STOP PHS), and step end (STEP TERM) are made by selecting settings for the various
items in the order described below.
The example described below is when entering the step end (STEP TERM) setting.
1. Open the SEQUENCE screen and display the PROGRAM screen.
See “4.4.2 Sequence settings”, for steps for displaying the PROGRAM screen.

2. Press theor

CANCEL

key to move the cursor to “STEP TERM”.

ENTER

Cursor

3. Press the

ENTER

key to display the selection box.

CANCEL

ENTER

Selection box

4. Press theor

CANCEL5. Press the

ENTER

key to move the cursor to the operation to be set.

ENTER

key to set the operation at the step end.

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EC750SA

4.4 Using the Sequence Function

4.4.4 Control of sequence operations
The CONTROL item in the SEQUENCE screen is used to control sequence operations.
A sequence can be started only when output is on. Consequently, the sequence control selection box canbe selected only when output is on.
Table4-11 lists items in the CONTROL selection box.
Table4-11. Items in CONTROL Selection Box
Selection Box Items
START
STOP
HOLD
BRAN0
BRAN1

Operation
Starts sequence operation. Switches to Run mode.
Stops sequence operation. Switches to Idle mode.
Pauses sequence operation. Switches to Hold mode.
Branches to the step specified by the branch step.
If the branch step is not specified, it is ignored.

The operation steps are described below.
a) When operating from a menu Operation steps
1. When output is on, open the SEQUENCE screen and display the CONTROL selection box.
See “4.4.2 Sequence settings”, for steps for displaying the CONTROL selection box.

2. Press theor

CANCEL3. Press the

ENTER

key to move the cursor to the operation to be set.

ENTER

key to perform the selected operation.

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EC750SA

4.4 Using the Sequence Functionb) When operating with the shortcut keys

 Operation step
The control of sequence operations, can also be performed with the shortcut keys at the bottom of thecontrol panel.
The START, STOP, and HOLD keys under “SEQUENCE” correspond to items in the CONTROL
selection box. Shortcut keys cannot be used to control branching.

Sequence shortcut keys

5.2.6

Figure 4-12. Sequence Shortcut Keys

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EC750SA

4.4 Using the Sequence Function

4.4.5 Clear sequence memory
Data is saved to sequence memory automatically. Separate sequence data can be saved for 100 V range
and 200 V range in AC-INT mode and for 100 V range and 200 V range in AC+DC-INT mode.
When clearing the sequence memory, use “MEMORY…” in the SEQUENCE screen.
The operation steps are shown below.

 Operation steps
1. Open the SEQUENCE screen and display the MEMORY EXEC box.
See “4.4.2 Sequence settings”, for description of the sequence for displaying the
MEMORY EXEC box.

2. Press the

ENTER

key to display the EXEC box.

EXEC box

CANCEL

ENTER

3. After “CLEAR” has been selected, if the

ENTER

key is pressed, the entire sequence memory iscleared.
During the memory clear operation (which lasts 5 to 6 seconds) key input can be accepted, but theoperations set by the key are executed after clearing is completed.
⇒ After clearing, initial values are set. (See “3.2 Display and Initial Settings at

Power-on”.)

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EC750SA

4.4 Using the Sequence Function

4.4.6 Example of sequence operation settings
The following describes the steps for setting a new sequence operation, based on the sequence transition
example described in Table4-12. The time unit is seconds (s). (See “5.6.5 Time unit setting” tochange the time unit.)
Step 5 setting
value

Outputvoltage100.0 V

Jump to step 6
upon branch 0.

Jump to step 2“KEEP” setting
is valid.

<3>75.0 V50.0 V<2><1>
25.0 V

0.0 V
Step 1(0.1 s)Step 2(0.2 s)Step 3(0.1 s)Step 4(0.2 s)Step 2(0.2 s)Step 3(0.1 s)Step 4(0.2 s)Step 5(0.2 s)Step 6(0.3 s)Time
Sequence start

Branch 0 input

Figure 4-13. Step Transition Example (during AC+DC-INT mode)
Table4-12. Program Settings
Step Number
Step time (TIME)
DC voltage (DC VOLT)
DC voltage operation type
Step end (STEP TERM)
Jump step (JUMP STEP)
Jump times (JUMP NUM)
Branch 0 (BRANCH0)

1
0.1
25. 0
SWEEP
CONT
0
1
0

2
0.2
75. 0
KEEP
CONT
0
1
0

3
0.1
75. 0
CONST
CONT
0
1
0

4
0.2
50. 0
SWEEP
CONT
2
1
0

5
0.2
100. 0
SWEEP
CONT
0
1
6

6
0.3
0.0
SWEEP
STOP
0
1
0

Though the DC voltage of step 2 is set to 75.0 V, the output DC voltage will be 25.0 V which is succeededfrom the previous step (step 1) because the DC operation type of step 2 is set to KEEP. After executing
step 4, the sequence will jump to step 2 because the jump step of step 4 is set to 2 (<1> in Figure 4-13).
The output DC voltage will be kept to 50.0 V coming from the previous step (step 4) because the DC
operation type of step 2 is set to KEEP. The jump times of step 4 is set to 1, so the sequence will move tothe next step (= step 5) after jumping once and executing step 4 (<2> in Figure 4-13). The step time ofstep 5 is set to 0.2 s and the branch 0 jump step of step 5 is set to step 6, so the sequence will immediately
move to step 6 when the branch 0 is input within the step time (<3> in Figure 4-13).

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EC750SA

4.4 Using the Sequence Function

The operation steps are described below.

 Operation steps using control panel
1. Open the PROGRAM screen.
The steps for opening the PROGRAM screen are described in“4.4.2 Sequence

settings”.

 Setting step 1

2. Press the

key to move the cursor to “DC VOLT”.

CANCEL

ENTER

ENTER

3. Press the

key to display the modification box.

CANCEL4. Press the

ENTER

and

keys to move the cursor to the 10’s place, then turn the MODIFY dial to set“2”. Next, move the cursor to the 1’s place and turn the MODIFY dial to set “5”.
⇒ This sets “25.0 V”.

Decrease

5. Press the

CANCELor

ENTER

Increase

key to close the modification box.

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EC750SA

4.4 Using the Sequence Function

6. Press the

key to move the cursor to the line displaying “CONST” (fourth line from the top).

CANCEL7. Press the

ENTER

ENTER

key to display the selection box.

Selection box
CANCEL8. Press theor

CANCEL9. Press the

ENTER

ENTER

key to move the cursor to “SWEEP”.

ENTER

key to confirm the setting.

The settings for all other items are the same as the default settings, so they are not changed.

4-42EC750SA

4.4 Using the Sequence Function

 Setting step 2

10. Press theor

key to move the cursor to “STEP”.

ENTER

11. Press the

key to display the modification box.

12. Press theandkeys to move the cursor to 1’s place, then turn the MODIFY dial to set “2”.

The set value will be reflected in output immediately.

ENTER

CANCEL13. Press theor

14. Press the

key to move the cursor to “TIME”.

key to close the modification box.

ENTER

15. Press the

key to display the modification box.

16. Press theandkeys to move the cursor to the 0.1’s place, then turn the MODIFY dial to set“2” (this sets “0.2 seconds”). The set value will be reflected in output immediately.

ENTER

CANCEL17. Press theor

key to close the modification box.

18. Using the same operations as in steps 2 to 5, set DC VOLT = 25, and using the same operations as
in steps 7 to 9, set the DC voltage operation type as “KEEP”.
Use the same operation steps to set step 3 and subsequent steps.

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EC750SA

4.4 Using the Sequence Function

4.4.7 Execution of sequence operations
Once sequence programming has been completed, start the sequence.
The execution steps for the sequence operations are described below.
a) When using the MISC menu Operation steps
1. Press the TOP MENU key (shortcut key) to return to the top menu. In the top menu, “SET” isshown in the upper left corner of the menu window.
The sequence is executed only when output is on. Make sure output is on beforehand.

TOP
MENU

SEQUENCE
STOP

START

2. Press theor

CANCEL

HOLD

LOCAL

key to move the cursor to the

icon.

ENTER

Cursor

3. Press the

ENTER

Press theCANCEL

key to display the MISC menuorkey to move the cursor to “OUTPUT”.

ENTER

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EC750SA

4.4 Using the Sequence Function

4. Press the

ENTER

key to display the selection box.

CANCEL

ENTER

5. Press the

key to move the cursor to “ON”.

CANCEL6. Press the

ENTER

ENTER

key to set output on, at which time the output on/off LED goes on.

OUTPUTOUTPUT

Output off

Output on

7. Select “SEQUENCE”, then press the

CANCEL

Output on/off LED is on

ENTER

key to display the SEQUENCE screen.

ENTER

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EC750SA

4.4 Using the Sequence Function

8. Press the

key to select “CONTROL”, then press the

ENTER

key to display the selection box.

Selection box
CANCEL

ENTER

9. Select “START”, then press the

ENTER

key to start the sequence.

b) When using keys on the control panel

 Operation steps
1. Press the TOP MENU key to return to the top menu, check the settings in the menu, then press the
OUTPUT

key on the control panel.
⇒ This set output on, at which time the output on/off LED goes on.
OUTPUTOUTPUT

Output off

Output on

Output on/off LED is on

2. Press the START key (shortcut key) to start sequence.
TOP
MENU

START

SEQUENCE
STOP

HOLD

LOCAL

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EC750SA

4.4 Using the Sequence Functionc) Operations after starting sequence
When a sequence is started, the status icon () is displayed in the status window to indicate thatthe sequence is being executed. A message box is also displayed to indicate the step number being
executed.
After returning to the SET screen, if the sequence is executed, the current step settings will not beshown in the SET screen. When the sequence is completed, the final step settings will be shown. If the
final step voltage settings are outside of the setting range limit, both DC voltage and AC voltage will
be set to 0 V. If the final step frequency settings are outside of the setting range limit, frequency will be
set to the limit value of the setting range limit. In either case, the output will be turned off.
Status icon indicates that sequenceis being executed

Step number being executed

Figure 4-14. LCD Screen During Sequence Execution

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EC750SA

4.5 Control Using External Control I/O Connector

4.5 Control Using External Control I/O Connector
Digital signals that are input to the external control I/O connector can be used to control sequences and theoutput on/off setting. (Detection cycle 2 ms)
The status of the EC750SA can be monitored by reading the output signals from the external control
input/output connector. (Switching cycle 0.1 ms)
The sequence step synchronized output signals are output from the external control I/O connector.
See “3.3.4 External control I/O”.
After the external signal input level was changed, several tens of ms might be required for the controller to
execute a function as a maximum response time. “Output ON/OFF” additionally requires the similar time
for a response of a relay device. These response times may vary.
Table4-13 lists the functions of the connector various pins.
Table4-13. Functions of External Control I/O Connector
Pin No.

Input/Output

1

Output2

Output3

Output4

Output5

Output6

Output

11

Input

12

Input

13

Input

14

Input

15

Input

16

Input

17

Input

Function
Outputs power source on/off status.
0 = Off, 1 = On.
Outputs the output on/off status.
0 = Off, 1 = On.
Outputs the limiter operation status.
0 = Not operating, 1 = Operating.
Outputs the software busy status.
0 = Normal operation, 1 = Busy.
Step synchronized output 0.
Outputs bit 0 of step synchronized output.
Step synchronized output 1.
Outputs bit 1 of step synchronized output.
Output off.
Sets output off when falling of input signal is detected.
Output on.
Sets output on when falling of input signal is detected.
Start sequence.
Starts sequence when falling of input signal is detected.
Stop sequence.
Stops sequence when falling of input signal is detected.
Hold sequence.
Holds (pauses) sequence when falling of input signal is detected.
Sequence branch trigger 0.
Jumps to step specified by BRANCH0 when falling of input signal isdetected.
Sequence branch trigger 1.
Jumps to step specified by BRANCH1 when falling of input signal isdetected.

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EC750SA

4.6 Output of Arbitrary Waveforms

4.6 Output of Arbitrary Waveforms
Arbitrary waveforms are generated by transferring data from an external PC to arbitrary waveform
memory via USB interface. (It can not be available to transfer via RS232 interface.)
Arbitrary waveforms can be edited and transferred using the accompanying control software.
See the control software user’s manual, for description of this control software.
When output is on, arbitrary waveforms cannot be changed. Make sure that output is off before changing
arbitrary waveforms.
a) Arbitrary waveform memory
The EC750SA includes arbitrary waveform memory as an internal signal source, and this memory canbe written to via the USB interface. Arbitrary waveform memory cannot be written to from the panel
screen.
• Waveform memory count: 16• Waveform length:4096 [words]• Waveform data:

15-bit binary (2’s complement format)

The valid range of waveform data is from −16384 to 16383.
If a value less than −16384 is input, the waveform data is clipped to −16384, and if a value greater than
16383 is input, the waveform data is clipped to 16383.
When the power source is off, arbitrary waveform memory data is retained by battery backup.
At the initial settings (factory settings) and when the memory is cleared, a sine wave is written to
ARB1 to ARB8, a square wave is written to ARB9 to ARB12, and a triangle wave is written to ARB13
to ARB16.
b) Output of arbitrary waveform
To select an arbitrary waveform, selectin the SET menu.

 Operation steps
1. Press theor

key to move the cursor to theicon, then press the

ENTER

key todisplay the selection box.

CANCEL

ENTER

Selection box

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EC750SA

4.6 Output of Arbitrary Waveforms

2. Press the

key to move the cursor to the arbitrary waveform to be selected (“ARB1”

orto “ARB16”), then press the

ENTER

key.

⇒ This sets the selected arbitrary waveform.

CANCEL

ENTER

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EC750SA

4.7 Synchronize the Output with External Signal

4.7 Synchronize the Output with External Signal
The EC750SA is equipped with an externally synchronized oscillation function. The software PLL
function synchronizes the output frequency to the frequency of the external synchronization TTL signal.
The output frequency can be synchronized to any frequency from 40 Hz to 500 Hz. The synchronization
phase difference cannot be set.
Select either external signal synchronous (EXT) or line synchronous (LINE) as the external sync signal
source.
When line synchronous is selected, synchronization is with the power source frequency.

Output waveform example

1

External sync signal (TTL)

0

Figure 4-15. Synchronized TTL Signal

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EC750SA

4.7 Synchronize the Output with External Signal

4.7.1 External signal synchronization
This function synchronizes the output frequency to a signal (pulse width 3 ms or more) that is input to therear panel external sync signal input (BNC connector). The output frequency can be synchronized to any
frequency from 40 Hz to 500 Hz.

 Operation steps
Selectin the SET menu to select external synchronization mode, then set the sync signal source

to external sync signal “EXT”.
1. Make sure that output is off. When output on, line synchronization cannot be switched off or on.

OUTPUTOUTPUT

Output on

Output off

2. Press theor

key to move the cursor to theicon.
CursorCANCEL3. Press the

ENTER

ENTER

key to display the selection box, then press theor

key to move thecursor to “AC-SYNC” or “AC+DC-SYNC”.

CANCEL

ENTER

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EC750SA

4.7 Synchronize the Output with External Signal

4. Press the

ENTER

CANCEL5. Press the

key to select the mode to be set.

ENTER

or

key to move the cursor to theicon, then press the

ENTER

key todisplay the selection box.

CANCEL6. Press the

Selection box

ENTER

or

key to move the cursor to “EXT”, then press the

ENTER

key.

⇒ This sets the external sync signal source to external sync signal “EXT”.

CANCEL

ENTER----------- Notes ---------------------------------------------------------------------------------------------------- The frequency range for external synchronization is 40 Hz to 5 0 0 H z. Only use settings
within this range.
-----------------------------------------------------------------------------------------------------------------------------

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EC750SA

4.7 Synchronize the Output with External Signal

4.7.2 Line synchronization
This function synchronizes the output frequency to the frequency of the AC power source line. The output
frequency can be synchronized to power source line frequency (50 Hz/60 Hz).

 Operation steps
Selectin the SET menu to select external synchronization mode, then set the sync signal source

to line synchronization (“LINE”).
1. Perform the same operations as were described above for steps 2 to 5 in “4.7.1 External signal
synchronization” to select external synchronization mode, after which the external sync signal
source selection box will be displayed.

CANCEL2. Press the

ENTER

or

Selection box

key to move the cursor to “LINE”, the press the

ENTER

key.

⇒ This sets the external sync signal source to “LINE”.

CANCEL

ENTER

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EC750SA

4.8 Using Memory Functions

4.8 Using Memory Functions
Various settings are retained in memory with battery backup, and the settings when the power source waslast turned off are restored at power-on.
Among these various settings, the basic settings (output mode, output range, DC settings, AC settings,
output current limiter, and setting range limit) can be stored in store/recall memory No. 1 to No. 30, andthese stored settings can be recalled.
The recall operation for store/recall memory can be executed only when output is off.
Memory control is performed via the “MEMORY” screen. After selecting an operation listed inTable4-14, use the selection box to specify the target memory number.
When a memory number is specified, the main settings stored in that memory are displayed in the left sideof the menu window.
Table4-14. Menu Items in MEMORY Screen
Indication on Control Panel
STORE...
RECALL...
CLEAR...

Type
Stores settings to specified memory number.
Recalls settings from specified memory number.
Clears settings in specified memory number.

Settings from selected
memory are shown here

Figure 4-16. Example of Settings from Memory

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EC750SA

4.8 Using Memory Functions

 Operation steps
Selectand then “MEMORY” in the MISC menu to store, recall, or clear memory or to set thetarget memory number.

1. Press theor

CANCEL

key to move the cursor to the

icon.

ENTER

Cursor

2. Press the

ENTER

Press theor

CANCEL3. Press the

key to display the MISC menu.

ENTER

CANCEL

key to move the cursor to “MEMORY”.

ENTER

key to display the MEMORY screen.

ENTER

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EC750SA

4.8 Using Memory Functions

4. Press theor

CANCEL5. Press the

ENTER

CANCEL6. Press the

CANCEL

key to select the operation to be performed.

ENTER

key to display the selection box.

ENTER

or

key to move the cursor to the target memory number.

ENTER

7. Check the settings shown in the left side of the menu window, and if they are OK press the

ENTER

key.
⇒ This performs the operation specified in step 4 for the specified memory number.

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EC750SA

4.9 Amplification of External Signal

4.9 Amplification of External Signal
The EC750SA can be used as an amplifier to which a signal is input from the external signal input
terminals on the rear panel, by selecting the external signal source mode (AC-EXT or AC+DC-EXT).
Connect the external signal source to the external signal input/external sync signal input terminal (EXTSIG IN/EXT SYNC IN) on the rear panel. For this connection, use a coaxial cable with a BNC connector.
The input impedance is 10 kΩ (unbalanced) and the input frequency ranges from DC to 550 Hz.
Output voltage = input voltage × external input gain
Table4-15. External Input Gain Setting Range
Setting
External input gain

Setting Range

Resolution

Initial Value

100 V range

0.0 to 220.0

0.1

100.0

200 V range

0.0 to 440.0

0.1

200.0

For description of the External signal input/external sync signal input terminal specifications:
See “3.3.5 External signal input/external sync signal input terminal”.
！

CAUTIONBe sure to read this section carefully before entering settings, so as to prevent problems in thisproduct or the load.

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EC750SA

4.9 Amplification of External Signala) Possible voltage settings for output

 Operation steps
Select the icon in the SET menu corresponding to the desired setting, then set a numerical value.
•“Select output mode”:

Select external mode (AC-EXT or AC+DC-EXT).

•“Output voltage range”:

Select 100 V or 200 V.

•“Set external input gain”:

Set a numerical value.

1. Press theor

key to move the cursor to heicon, then press the

ENTER

key.

⇒ The selection box is displayed.

Selection box
CANCEL2. Press the

ENTER

or

key to move the cursor to the mode to be set, then press the

ENTER

key.

⇒ This sets the selected output mode.

CANCEL3. Press the

ENTER

or

Selection box

key to move the cursor to theicon, then press the

ENTER

key.

⇒ The selection box is displayed.

Selection box
CANCEL

ENTER

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EC750SA

4.9 Amplification of External Signal

4. Press the
ENTER

or

key to move the cursor to the output voltage range to be set, then press thekey.

⇒ This sets the selected output voltage range.

CANCEL5. Press the

ENTER

or

key to move the cursor to theicon, then press the

ENTER

key.

⇒ The modification box is displayed.

CANCEL6. Press the

ENTER

and

keys to move the cursor to the column to be changed, turn the MODIFY dialand set a numerical value.
⇒ The set value is reflected immediately in the output.

Decrease

7. After entering all of the values, press the

Increase

CANCEL

4-60

or

ENTER

key to close the modification box.

EC750SA

4.9 Amplification of External Signalb) Signal input
The setup for external input is completed once the above operations and the settings are done. Now
connect the signal source and input the signal.
If the input signal exceeds the maximum voltage that can be output, the output overvoltage protection
function will operate, in which case output may be turned off and the waveform may become distorted.
Caution is therefore required concerning the input voltage level and the external input gain.

！

CAUTION To avoid clipping of the output voltage, use an input voltage of ±2.2 V or less.

Also, to prevent problems in this product input block, do not allow the input voltage
to exceed ±10 V.
 When using external input mode, the following functions and keys cannot be used.

• Output voltage setting• Output frequency setting• Memory

See “5.3.3 Setting output voltage”.
See “5.3.4 Setting output frequency”.

See “4.8 Using Memory Functions”.

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EC750SA

4.10 Adding External Signals and Internal Signals

4.10 Adding External Signals and Internal Signals
When in the EC750SA internal + external mode (AC-ADD, AC+DC-ADD), the internal signal source
signal can be added to the external signal input prior to output.
When using a signal input from an external source as a signal source, connect to the rear panel externalsignal input/external sync signal input terminal (EXT SIG IN/EXT SYNC IN).
For this connection, use a coaxial cable with a BNC connector.
The input impedance is 10 kΩ (unbalanced), and the input frequency ranges from DC to 500 Hz.
See “4.9 Amplification of External Signal”.
For description of the External signal input/external sync signal input terminal specifications:
See “3.3.5 External signal input/external sync signal input terminal”.
The setting ranges for output voltage and output frequency can be limited.
See “3.4.7 Using limiter functions”.
See “5.5.5 Setting range limiter (LIMIT)”.

 Operation steps
Select“output mode” in the SET menu, then select internal + external mode (AC-ADD and

AC+DC-ADD).

1. Press theor

key to move the cursor to theicon, then press the

ENTER

key.

⇒ The selection box is displayed.

Selection box
CANCEL2. Press the

ENTER

or

key to move the cursor to the mode to be set, then press the

ENTER

key.

⇒ This sets the selected output mode.

CANCEL

ENTER

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EC750SA5. MENUS
5.1 Screen Configuration ................................................................. 5-2
5.1.1 Status icons ......................................................................... 5-4
5.1.2 Warnings and error messages ............................................. 5-5
5.1.3 Sequence display ................................................................ 5-5
5.2 Basic Operations ....................................................................... 5-6
5.2.1 Menus .................................................................................. 5-6
5.2.2 Navigating the menu tree ................................................... 5-11
5.2.3 Numerical value input operations ...................................... 5-12
5.2.4 Selection and input operations that require confirmation .. 5-12
5.2.5 EXEC input ........................................................................ 5-13
5.2.6 Shortcut keys ..................................................................... 5-13
5.3 SET Menu ................................................................................ 5-14
5.3.1 Output mode setting .......................................................... 5-15
5.3.2 Output voltage range setting ............................................. 5-16
5.3.3 Setting output voltage ........................................................ 5-17
5.3.4 Setting output frequency ................................................... 5-18
5.3.5 Output initial phase settings .............................................. 5-18
5.3.6 Waveform settings ............................................................. 5-19
5.3.7 Peak current limiter settings .............................................. 5-19
5.3.8 RMS current limiter settings .............................................. 5-20
5.4 MEASURE Screen ................................................................... 5-21
5.4.1 Output voltage measurement ............................................ 5-22
5.4.2 Output current measurement ............................................. 5-23
5.4.3 Output power measurement .............................................. 5-24
5.4.4 Load power factor measurement ....................................... 5-25
5.4.5 Load crest factor measurement ......................................... 5-25
5.4.6 Output harmonic current measurement ............................. 5-26
5.4.7 External synchronization frequency measurement ............ 5-26
5.5 MISC Menu .............................................................................. 5-27
5.5.1 Sequence (SEQUENCE) ................................................... 5-27
5.5.2 Memory (MEMORY) .......................................................... 5-31
5.5.3 Remote (REMOTE) ........................................................... 5-32
5.5.4 System (SYSTEM) ............................................................. 5-33
5.5.5 Setting range limiter (LIMIT) .............................................. 5-34
5.5.6 Selection of measurement display (MEASURE) ................ 5-35
5.5.7 Reset of peak current hold value ....................................... 5-35
5.5.8 Output on/off ...................................................................... 5-36
5.5.9 Adjusting DC offset ............................................................ 5-37
5.6 System Menu ........................................................................... 5-39
5.6.1 Keylock .............................................................................. 5-41
5.6.2 Beep sound ....................................................................... 5-42
5.6.3 LCD contrast adjustment ................................................... 5-43
5.6.4 LCD display color setting ................................................... 5-44
5.6.5 Time unit setting ................................................................ 5-45
5.6.6 Output on/off setting at power-on ...................................... 5-46
5.6.7 External control input enable/disable setting ..................... 5-47
5.6.8 Reset function ................................................................... 5-48
5.6.9 System information ............................................................ 5-48

5-1

EC750SA

5.1 Screen Configuration

5.1 Screen Configuration
The LCD on the control panel splits in multiple windows, as is shown in Figure 5-1 and Figure 5-2.

A
B
D

C

Figure 5-1. LCD Screen (When Normal)

E

Figure 5-2. LCD Screen (When Warning Is Displayed)

5-2

EC750SA

5.1 Screen Configuration

The following information is displayed in various parts of the screen.
A: Status window:

This window shows various status of the devices.

B: Message box:

When an error has occurred, a message box appears near the bottom of thestatus window, and the cause is displayed. The message box is closed
automatically after 1.5 seconds. It is also used to indicate an overload, as
well as the progress of a sequence.

C: Measured value window: This window displays measured values.
When measuring the harmonic current, measured values are displayed in
the area combined C and D.
D: Menu window:

This window is used to enter settings.

E: Message display window: A warning message is displayed in this message window whenever there isan error that requires confirmation by the user. The displayed information
remains until the ENTER key has been pressed.

5-3EC750SA

5.1 Screen Configuration

5.1.1 Status icons
The status window displays status icons that indicate the status of the EC750SA.
These status icons are listed n Table5-1.
Table5-1. Status Icons List
Icon

Item

Description

Battery almost depleted

When a backup memory checksum error occurs, this icon
flashes to indicate that the battery is almost depleted.

UnlockThis icon goes on when external line synchronization isdisabled.

Calibration data
valid/invalid

This icon flashes when the calibration data is invalid(uncalibrated).

Busy

This icon goes on to indicate busy status.
These icons are displayed in the same positions on the control
panel. When the limiter operates, the displayed icons change asshown below.

Limiter operations

Sequence is being executed

Sequence hold
Keylock

RemoteDuring peak current limiter operation:

appears.

During RMS current limiter operation:

appears.

During power limiter operation:

appears.

These icons are displayed in the same positions on the control
panel. The displayed icons change as shown below according
to the sequence status.
In Idle mode: Nothing is displayed.
In Run mode:

is displayed.

In Hold mode:

is displayed.

This icon goes on when keylock is on.
The displayed icons change as shown below according to theEC750SA status.
Local:
Nothing is displayed.
Remote:is displayed.

Local lock out:

is displayed.

5-4EC750SA

5.1 Screen Configuration

5.1.2

Warnings and error messages

When a warning or error occurs, an error message is displayed in a message box or message display
window.
See “7 TROUBLESHOOTING”, for further description of error messages.

5.1.3 Sequence display
The EC750SA is equipped with a function that indicates the progress of the sequence being executed. The
information listed in Table5-2 is displayed in the status window.
Table5-2. Sequence Display
Message

Description

RemarkSEQUENCE:
RUNNING / STEP ***Sequence is being executed*** indicates step number being executed.

SEQUENCE:
HOLDING / STEP ***.

Sequence is being held*** indicates step number being held.

SEQUENCE: FINISH

Sequence has been completedThis message is closed automatically after
two seconds.

5-5EC750SA

5.2 Basic Operations

5.2 Basic Operations
The EC750SA basic operations are described below.

5.2.1

Menus

The EC750SA uses a hierarchical menu system for setting various parameters.
Menu operations are performed using the menu window in the LCD screen.
Figure 5-3 illustrates the EC750SA menu tree.

(1) SET(2) MISC(3) SEQUENCE(4) PROGRAM(5) MEMORY(6) REMOTE(7) SYSTEM(8) INFORMATION(9) LIMIT

Figure 5-3. Menu Tree
The items in these menus are listed in Table5-3 to Table5-9.

5-6EC750SA

5.2 Basic Operations

Table5-3. Items in SET Menu
Icon

Item

Reference

Select output mode

See “5.3.1 Output mode setting”.

Select output voltage range

See “5.3.2 Output voltage range
setting”.

Set AC voltage to be output

See “5.3.3 Setting output
voltage ”.

Set DC voltage to be output

See “5.3.3 Setting output voltage ”.

Set frequency to be output

See “5.3.4 Setting output
frequency”.

Set phase when output is on

See “5.3.5 Output initial phasesettings”.

Set waveform to be output

See “5.3.6 Waveform settings”.

Select external sync signal source

See “4.7 Synchronize the Output
with External Signal”.

Set external input gain

See “4.9 Amplification of External
Signal”.

Set peak current limit value (positive)

See “5.3.7 Peak current limiter
settings”.

Set peak current limit value (negative)

See “5.3.7 Peak current limiter
settings”.

Set RMS current limit value

See “5.3.8 RMS current limiter
settings”.

Set use of other functions, andmiscellaneous items

See “Table5-4. Items in MISC
Menu”.

5-7

EC750SA

5.2 Basic Operations

Table5-4. Items in MISC Menu
Setting Name

Setting

Reference

SEQUENCE

Open sequence menu

See “5.5.1 Sequence (SEQUENCE)”.

MEMORY

Open memory menu

See “5.5.2 Memory (MEMORY)”.

REMOTE

Open remote menu

SYSTEM

Open system menu

LIMIT

Open setting range limit menu

MEASURE

Select measurement display

RESET Ipkh

Reset peak current hold value

OUTPUT

Select output on/off

See “5.5.3 Remote (REMOTE)”.
See “5.5.4 System (SYSTEM)” and“5.6 System Menu”.
See “5.5.5 Setting range limiter(LIMIT)”.
See “5.5.6 Selection of measurement
display (MEASURE)”.
See “5.5.7 Reset of peak current holdvalue”.
See “5.5.8 Output ”.

DC ADJUST

Set the DC offset adjustment

See “5.5.9 Adjusting DC offset”.

5-8

EC750SA

5.2 Basic Operations

Table5-5. Items in SEQUENCE Menu
Setting NameCONTROL...
PROGRAMSTEP
TIMEDC VOLTAC VOLT
FREQ
WAVE
PHS
SYNC CODE

STOP PHS
STEP TERMJUMP STEPJUMP NUM
BRANCH0
BRANCH1
MEMORY...

Setting
Control sequence operation
Step number
Step time
DC voltage
DC operation typeAC voltage
AC operation typeAC frequency
AC frequency operation type
Waveform
Waveform operation type
Step start phase
Phase operation type
Step synchronized output
Step synchronized output
operation type
Step end phasevalid/invalid
Step end phase
Step end
Jump step
Jump times
Branch step 0
Branch step 1

Reference
See “4.4.4 Control of sequence
operations”.

See “4.4.3 Programming sequence”.

See “4.4.5 Clear sequence
memory”.

Clear sequence memory

Table5-6. Items in MEMORY Menu
Setting NameSTORE...
RECALL...
CLEAR...

Setting
Store settings
Recall settings
Clear settings

Reference
See “5.5.2 Memory (MEMORY)”.

5-9

EC750SA

5.2 Basic Operations

Table5-7. Items in REMOTE Menu
Setting NameLOCAL...
INTERFACE
RS232

Setting
Switch to local mode
Switch USB/RS232
Set the RS232

Reference
See “5.5.3 Remote (REMOTE)”.

Table5-8. Items in SYSTEM Menu
Setting NameKEYLOCKBEEP

Keylock
Beep

CONTRASTLCD contrast

COLOR

LCD display color

TIME UNIT

Time unit

INIT OUT

Output on/off at power-on

EXT CONTROLRESET...
INFORMATION

Setting

External control input
enable/disable
Reset
Display system information

Reference
See “5.6.1 Keylock”.
See “5.6.2 Beep sound”.
See “5.6.3 LCD contrast
adjustment”.
See “5.6.4 LCD display color
setting”.
See “5.6.5 Time unit setting”.
See “5.6.6 Output on/off setting at
power-on”.
See “5.6.7 External control input
enable/disable setting”.
See “5.6.8 Reset function”.
See “5.6.9 System information”.

Table5-9. Items in LIMIT Menu
Setting name
+Vo
−Vo
F Up
F Lo

Setting
Positive voltage setting limit
Negative voltage setting limit
Frequency setting upper limit
Frequency setting lower limit

5-10Reference
See “5.5.5 Setting range limiter(LIMIT)”.
See “Table3-13. Voltage andFrequency Setting Range Limit”.

EC750SA

5.2 Basic Operations

5.2.2 Navigating the menu tree
Use the UP and DOWN keys to move among items displayed in the menu windows. Press the ENTER key
to go to a lower-level menu in the menu tree and press the CANCEL key to go to the higher-level menu.

 Operation procedures
The specific operation procedures are as follows.
1. Use the UP and DOWN keys to move the menu cursor displayed in the menu window, then selecta menu item with ▶ symbol on the right.
2. At this point, pressing the ENTER key will move the cursor to a lower-level menu.
3. Now, if the CANCEL key is pressed, the cursor will go back to the higher-level menu.
4. If the CANCEL key is pressed multiple times, it will eventually return to the cursor to the top
menu.
There is also a TOP MENU key among the shortcut keys. Pressing this key once will move thecursor to the top menu.

5-11EC750SA

5.2 Basic Operations

5.2.3 Numerical value input operations
When input of numerical values is required, the modification box is displayed.
When the modification box is opened, the digit cursor is displayed in one column. Use the DIGIT key tomove the digit cursor and use the MODIFY key to increase or decrease values. Each time the MODIFY
key is used to change a value in the modification box, the actual setting is updated immediately. The
modification box is closed when either the ENTER key or the CANCEL key is pressed

Figure 5-4. Modification Box

5.2.4 Selection and input operations that require confirmation
The selection box is displayed when selecting and setting an item from among multiple items.
When the selection box is opened, the selection cursor is displayed at one of the items. The items are listed
vertical, so use the UP and DOWN keys to move the selection cursor.
If there are too many items to fit in the selection box, awill be displayed at the top line or awill bedisplayed at the bottom line. Each time the UP or DOWN key is pressed, the item list is scrolled one line
up or down. The selection cursor does not move to theor.

When the ENTER key is pressed, the setting is actually updated, and the selection box is closed. If theselection box is closed by pressing the CANCEL key, any changed settings become invalid.

Figure 5-5. Selection Box

5-12

EC750SA

5.2 Basic Operations

5.2.5 EXEC input
The EXEC box is displayed for items to be actually executed by pressing the ENTER key.
Only one target item is displayed in the EXEC box, and the cursor is shown on that item.
When the ENTER key is pressed, the item is actually executed, and the EXEC box is closed. If the EXEC
box is closed by pressing the CANCEL key, nothing is executed.

Figure 5-6. EXEC Box

5.2.6 Shortcut keys
The EC750SA shortcut keys can be used to perform the following operations.
Table5-10. Shortcut Keys
Key No.
12
3
45

Indication on Control Panel
TOP MENU
START
STOP
HOLD
LOCAL

Function
Goes back to normal display (top of menu)
Starts sequence
Stops sequence
Holds (pauses) sequence
Returns to local mode

See “4.4 Using the Sequence Function”, for description of the functions of keys 2 to 4.
See “5.5.3 Remote”, for description of the function of key 5.

5-13EC750SA

5.3 SET Menu

5.3 SET Menu
The SET menu in the menu window is used to set basic functions.
The available settings differ according to the output mode.
Table5-11. SET Menu Items and Output Modes
Output ModeINTAC
EXT ADD SYNC INT

AC+DC
EXT ADD SYNC

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

Item
Selection of output mode
See “5.3.1 Output mode setting”.
Selection of output voltage range
See “5.3.2 Output voltage range
setting”.
Setting of AC voltage to be output
See “5.3.3 Setting output
voltage”.
Setting of AC voltage to be output
See “5.3.3 Setting output
voltage”.
Setting of frequency to be output
See “5.3.4 Setting output
frequency”.
Setting of phase when output is on
See “5.3.5 Output initial phasesettings”.
Selection of waveform to be output
See “5.3.6 Waveform settings”.
Selection of external sync signal source
See “4.7 Synchronize the Output
with External Signal”.
External input gain setting
See “4.9 Amplification ofExternal Signal”.
Output peak current limit value (positive)
setting
See “5.3.7 Peak current limiter
settings”.
Output peak current limit (negative) setting
See “5.3.7 Peak current limiter
settings”.
Output RMS current limit value setting
See “5.3.8 RMS current limiter
settings”.
Use of other functions and detailed settings
See “Table5-4. Items in MISC
Menu”.

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√
√

√

√

√

√

√

√

√

√

√

√

√

√

5-14

√
√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

√

EC750SA

5.3 SET Menu

5.3.1 Output mode setting
Table5-12 lists the eight output modes that can be selected (based on combinations of two operation
modes and four signal source modes).
The mode cannot be changed when output is on. Turn output off before entering settings.
Table5-12. Output Modes
Operation ModeAC (alternate current)

AC+DC(direct current)

Signal Source Mode
INT (internal)
EXT (external)
ADD (internal + external)
SYNC (external synchronization)
INT (internal)
EXT (external)
ADD (internal + external)
SYNC (external synchronization)

Output Mode
AC-INT
AC-EXT
AC-ADD
AC-SYNC
AC+DC-INT
AC+DC-EXT
AC+DC-ADD
AC+DC-SYNCa) Selection of operation mode
The EC750SA enables selection between two operation modes: AC (alternate current) and AC+DC(direct current).
• AC:

In this mode, the EC750SA is used as an AC constant-voltage source. The voltage
supplied to the load is the set value or proportionate to the input signal. The DC
component is removed.

• AC+DC: In this mode, the EC750SA is used as a DC constant-voltage source. The voltage supplied
to the load is the set value or proportionate to the input signal.
b) Selection of signal source
The EC750SA enables selection of four signal source modes: INT (internal), EXT (external), ADD(internal + external), and SYNC (external synchronization).
• INT:The EC750SA internal signal source is used. DC or AC set via the control panel menu is
output.

• EXT:

Signals from an external signal that is connected to the external signal input/external sync
signal input terminal (EXT SIG IN/EXT SYNC IN) on the rear panel are output as external
input gain amplified signals.

• ADD:In this mode, a waveform comprised of the above INT and EXT signal sources is output.

• SYNC: In this mode, the output waveform is synchronized with either an external sync signal
source (TTL) connected to the external signal input/external sync signal input terminal(EXT SIG IN/EXT SYNC IN) on the rear panel or the input power line.

5-15

EC750SA

5.3 SET Menu

Figure 5-7 shows a block diagram of the EC750SA signal sources.
SYSTEM CONTROLEXT INPUT GAIN

EXT
ADD

EXT SIG IN
EXT SYNC IN

EXT
PLL

～LINE

to AMP CONTROL

LINE
SYNC

INT
ADD
SYNC

INT OSC

Figure 5-7. Block Diagram of Signal Sources Operation steps
Selectin the SET menu.

See “3.4.2 Setting output mode”, for how to select the output mode.

5.3.2 Output voltage range setting
Select 100 V or 200 V as the output voltage range.
The output voltage range cannot be changed when output is on.
The output voltage setting, current limiter setting, etc., vary according to the output voltage range setting.
See “Table4-2. Setting Range Options for Various Output Voltage Ranges”.
Output voltage range settings are retained for each operation mode (AC and AC+DC).

 Operation steps
To set the output voltage range, selectin the SET menu.
For description of output voltage range settings:
See “3.4.3 Setting output voltage range”.
See “4.1.3 Setting the output voltage range”.

5-16

EC750SA

5.3 SET Menu

5.3.3 Setting output voltage
The output voltage settings listed below can be made for the two operation modes.
Table5-13. Output Voltage Settings
Operation Mode

Setting

AC mode(AC-INT,
AC-ADD,
AC-SYNC)AC
voltageDC
voltage

AC+DC mode
(AC+DC-INT,
AC+DC-ADD,
AC+DC-SYNC)

AC
voltage

100 V range
200 V range
100 V range
200 V range
100 V range
200 V range

Setting Range
0.0 to 155.0 Vrms
0.0 to 440.0 Vp-p
0.0 to 310.0 Vrms
0.0 to 880.0 Vp-p
−220.0 to +220.0 V−440.0 to +440.0 V
0.0 to 155.0 Vrms
0.0 to 440.0 Vp-p
0.0 to 310.0 Vrms
0.0 to 880.0 Vp-p

Resolution
0.1 Vrms
0.1 Vp-p0.1 Vrms
0.1 Vp-p
0.1 V
0.1 V
0.1 Vrms
0.1 Vp-p0.1 Vrms
0.1 Vp-p

When the selected AC voltage waveform is either SIN (sine wave) or SQU (square wave), the AC voltage
setting is made in Vrms units. When it is ARB (arbitrary waveform) 1 to 16, this setting is made in Vp-p
units.

 Operation steps
Select either“AC voltage” or“DC voltage” in the output voltage SET menu then set a

numerical value.
See “3.4.5 Setting output voltage”, for description of output voltage setting.
See also “4.1.4 Setting the output voltage”.

5-17

EC750SA

5.3 SET Menu

5.3.4 Setting output frequency
This sets the AC voltage frequency.
When either AC-SYNC or AC+DC-SYNC mode is selected, the AC voltage frequency cannot be set.
Table5-14. Output Frequency Setting
Setting Range

Resolution

Setting Accuracy

1.0 Hz to 550.0 Hz

0.1 Hz±0.01% (1.0 Hz to 550.0 Hz, 23 ±5°C)

See “3.4.7 Using limiter functions”, when using a setting range limit for output frequency.

 Operation steps
To set the output frequency, set a numerical value labeledin the SET menu.

See “3.4.6 Setting output frequency”, for description of output frequency settings.
See “5.5.5 Setting range limiter (LIMIT)”, for description of setting range limits.
-------- ！ CAUTION ------------------------------------------------------------------------------------------------If the frequency is set under 40 Hz in AC-INT mode, there is a possibility that the output
waveform will be distorted and DC offset will be output.
----------------------------------------------------------------------------------

5.3.5 Output initial phase settings
When AC-INT, AC-ADD, AC-SYNC, AC+DC-INT, AC+DC-ADD, or AC+DC-SYNC mode is selected,
the AC voltage phase can be set according to the internal signal source when output is on.
Table5-15. Output Initial Phase Settings
Setting Range

Resolution

0.0° to 359.9°

0.1°

 Operation steps
To set the phase, selectin the SET menu and set a numerical value.
For description of the output initial phase:
See “4.2.2 Set phase at output on”.

5-18

EC750SA

5.3 SET Menu

5.3.6 Waveform settings
When AC-INT, AC-ADD, AC-SYNC, AC+DC-INT, AC+DC-ADD, or AC+DC-SYNC mode is selected,
select sine wave, square wave, or arbitrary waveform (16 types) as the waveform to be output.
Arbitrary waveforms data is transferred to EC750SA via USB interface.

 Operation steps
To select a waveform, selectin the SET menu.

See “3.4.4 Setting waveform”, for description of waveform settings.
See the control software user’s manual, for description of arbitrary waveform transfers.

5.3.7 Peak current limiter settings
The positive value and the negative value of the peak current limiter can be set independently.
If the output peak current exceeds the set current, the output voltage is clipped.
Setting range limits can be set for output voltage and output frequency.
See “5.5.5 Setting range limiter (LIMIT)”.
Table5-16. Peak Current Limiter Setting Range
Setting

Setting Range

Resolution

Initial Value

Peak current
limiter (positive)

100 V range+10.0 A to +31.5 A

0.1 A+31.5 A

200 V range+5.0 A to +15.8 A

0.1 A+15.8 A

Peak current
limiter (negative)

100 V range−31.5 A to −10.0 A

0.1 A−31.5 A

200 V range−15.8 A to −5.0 A

0.1 A−15.8 A

Limiter settings are retained separately for the 100 V and 200 V range.
Since these are not fully constant current operations, the specified limit value may not be achieved,
depending on the load.

 Operation steps
Select the icon in the SET menu, then set a numerical value.
• Peak current limiter (positive):• Peak current limiter (negative):
See “3.4.7 Using limiter functions”, for description of the output peak current limiter
settings.

5-19

EC750SA

5.3 SET Menu！

CAUTION

Note with caution that the peak current limiter may allow overshooting, depending on the load, andtherefore may not achieve the peak current value as set.
For an inductive load, operation of the limiter can cause an output overvoltage, triggering theprotection function. In this case, the peak current limiter settings (both positive and negative) should
be reduced.

！

CAUTION

In the case that the output current flows suddenly by the output short circuit or the frequency is high,if the response speed of the current limiter is not enough to limit the output current, the output
overcurrent protection may work in this case and then output is turned off.

5.3.8 RMS current limiter settings
This limits the output RMS current.
When the output RMS current exceeds this setting, the output voltage is suppressed.
Table5-17. RMS Current Limiter Setting Range
Setting
RMS current
limiter

Setting Range

Resolution

Initial Value

100 V range

1.0 A to 10.5 A

0.1 A

10.5 A

200 V range

1.0 A to 5.3 A

0.1 A

5.3 A

 Operation steps
Selectin the SET menu and set numerical values.

See “3.4.7 Using limiter functions”, for description of the output average value current
limiter.
！

CAUTION

It will take time after the output current exceeds a limiter until the output current is restrictedenough, because the RMS current limiter needs to calculate effective value. The length of the time
until limiting output current changes depending on the conditions of the output voltage setting, load,
and limiter setting.
ex1：Output voltage 20 V, resistance load 10 Ω, RMS current limiter setting 1.5 A
approx 10 s (reference value)
ex2：Output voltage 100 V, resistance load 10 Ω, RMS current limiter setting 1.5 A
approx 0.5 s (reference value)
In the case that the output current flows suddenly by the output short circuit or the frequency ishigh, if the response speed of the current limiter is not enough to limit the output current, the output
overcurrent protection may work in this case and then output is turned off.

5-20

EC750SA

5.4 MEASURE Screen

5.4 MEASURE Screen
The MEASURE screen in the measured value window displays measured values for items selected asmeasurement display items (some of which depend on the output mode).
The measured values for output voltage and output current are displayed as values set via “MEASURE”
in the MISC menu.
Table5-18. Display Items in MEASURE Screen
Item

Unit

SelectMeasurement
Display

Voltage RMS value

Vrms

RMS

DC voltage value

V

AVG

Reference“5.4.1 Output voltage
measurement”

Maximum
voltage value

Vpk

PEAK

Minimum voltage value

Vpk

PEAK

Current RMS value

Arms

RMS

DC current value

A

AVG

Maximum
current value

Apk

PEAK

Minimum
current value

Apk

PEAK

Current peak value hold

Apk

PEAK

Effective power

W

Alwaysdisplayed

Apparent power

VA

Alwaysdisplayed

Reactive powervar

Alwaysdisplayed

Synchronization
frequencyHz

During external
synchronization
mode only

Load power factor

None

Alwaysdisplayed“5.4.4 Load power factor
measurement”

Load crest factor

None

Alwaysdisplayed“5.4.5 Load crest factor
measurement”

5-21“5.4.2 Output current
measurement”“5.4.3 Output power
measurement”“5.4.7 External synchronization
frequency measurement”

EC750SA

5.4 MEASURE Screen

5.4.1 Output voltage measurement
When “MEASURE” has been selected in the MISC menu, RMS value (RMS), average DC (AVG), or
peak value (PEAK) is displayed.
The initial setting (factory setting) is to display the RMS value (RMS).
See “3.4.9 Using measurement functions”.
a) RMS value• Full scale:

RMS value of AC+DC
250.0 Vrms: 100 V range
500.0 Vrms: 200 V range• Display resolution:

0.1 Vrms• Measurement accuracy: at 45 Hz to 65 Hz±(0.5% of rdg + 0.3 Vrms): 100 V range±(0.5% of rdg + 0.6 Vrms): 200 V range
at DC, 40 Hz to 550 Hz±(0.7% of rdg + 0.9 Vrms): 100 V range±(0.7% of rdg + 1.8 Vrms): 200 V range(at 23 ±5°C)b) Average value• Full scale:

Average value of AC+DC (measurement of DC)±250.0 V: 100 V range±500.0 V: 200 V range• Display resolution:

0.1 V• Measurement accuracy: ±(|0.5% of rdg| + 0.4 V): 100 V range±(|0.5% of rdg| + 0.8 V): 200 V range(at 23 ±5°C)c) Peak value

Minimum

voltageandmaximum

voltagearedisplayed

separately• Full scale:±250 Vpk: 100 V range±500 Vpk: 200 V range• Display resolution:

1 Vpk• Measurement accuracy: ±(|1.5% of rdg| + 3 Vpk): 100 V range±(|1.5% of rdg| + 6 Vpk): 200 V range(reference value, at 23 ±5°C, sine wave of which frequency is 45 Hz to 65
Hz)

5-22

EC750SA

5.4 MEASURE Screen

5.4.2 Output current measurement
When “MEASURE” has been selected in the MISC menu, RMS value (RMS), average DC (AVG), or
peak value (PEAK) is displayed.
The initial setting (factory setting) is to display the RMS value (RMS).
See “3.4.9 Using measurement functions”.
a) RMS value

RMS value of AC+DC• Full scale:

15.00 Arms

• Display resolution:

0.01 Arms• Measurement accuracy: at 45 Hz to 65 Hz±(0.5% of rdg + 0.04 Arms)
at DC, 40 Hz to 550 Hz±(0.7% of rdg + 0.08 Arms)(at 23 ±5°C, output current is 5% to 100% of the maximum output current)b) Average value

Average value of AC+DC (measurement of DC)• Full scale:±15.00 A• Display resolution:

0.01 A• Measurement accuracy: ±(|0.5% of rdg| + 0.08 A)(at 23 ±5°C, output current is 5% to 100% of the maximum output current)c) Peak value

Minimum current and maximum current are displayed separately• Full scale:±45.0 Apk

• Display resolution:

0.1 Apk• Measurement accuracy: ±(|2% of rdg| + 0.4 Apk)
(reference value, at 23 ±5°C, sine wave of which frequency is 45 Hz to 65
Hz)d) Peak value holdMaximum values of | maximum current | and | minimum current |The output current maximum peak value is displayed.
A reset operation returns the peak current hold value to 0 Apk.
See “4.2 Measurement of Inrush Current”.
• Full scale:45.0 Apk• Display resolution:

0.1 Apk

5-23

EC750SA

5.4 MEASURE Screen

5.4.3 Output power measurement
The output power values described below are always displayed.
a) Effective power• Full scale:1200 W• Display resolution:

1W• Measurement accuracy: at 45 Hz to 65 Hz±(2% of rdg +1 W)
at DC±(3% of rdg +12 W)(at 23 ±5°C, load with the power factor 0.5 to lower than 1, 50 V or higher
output voltage, output current is 10% to 100% of the maximum output
current)b) Apparent power

Calculated as output voltage RMS value × output current RMS value• Full scale:

1400 VA• Display resolution:

1 VA• Measurement accuracy: at 45 Hz to 65 Hz±(2% of rdg +1 VA)
at DC±(3% of rdg +12 VA)(at 23 ±5°C, 50 V or higher output voltage, output current is 10% to 100%of the maximum output current)c) Reactive power• Full scale:• Display resolution:

Calculated as
1400 var(apparent power)2-(effective power)2

1 var• Measurement accuracy: ±(2% of rdg +1 var)
(at 23 ±5°C, load with the power factor 0 to lower than 0.5, 45 Hz to 65 Hz,
50 V or higher output voltage, output current is 10% to 100% of the
maximum output current)

5-24EC750SA

5.4 MEASURE Screen

5.4.4 Load power factor measurement
Calculated by effective power/apparent power
In the case that it exceeds the measurement range, “− − − − −” is displayed.
• Measurement range:

0.00 to 1.00

• Display resolution:

0.01

5.4.5 Load crest factor measurement
Calculated by (maximum values of maximum current and minimum current)/RMS
current.
In the case that it exceeds the measurement range, “− − − − −” is displayed.
• Measurement range: 1.00 to 50.00• Display resolution:

0.01

5-25

EC750SA

5.4 MEASURE Screen

5.4.6 Output harmonic current measurement
Output harmonic current measurement is enabled only in the AC-INT mode and when the frequency
setting is 50 Hz or 60 Hz.
When HC1, HC2, HC3, or HC4 is selected under “MEASURE” in the MISC menu, the harmonicmeasurement window is displayed.
At that time, measurements other than output harmonic measurement are not performed. Thismeasurement does not conform to the IEC or other standards.
See “4.3 Measurement of Harmonic Current”.
• Measurement range:

To 40th harmonic of fundamental wave

• Full scale:

15.00 Arms and 500.0%• Display resolution:

0.01 Arms and 0.1%

• Measurement accuracy:

at RMS value current up to 10th±(1% of rdg + 0.08 Arms)
at RMS value current from 11th up to 20th±(2% of rdg + 0.08 Arms)
at RMS value current from 21st up to 40th±(5% of rdg + 0.08 Arms)(All in the case of reference value, 23 ±5°C)
Note: This measurement does not conform to the IEC or other standards.

5.4.7 External synchronization frequency measurement
The frequency measured value is displayed only in the external synchronization mode (AC-SYNC or
AC+DC-SYNC).
See “4.7 Synchronize the Output with External Signal”.
• Measurement range:

38.0 Hz to 525.0 Hz• Display resolution:

0.1 Hz• Measurement accuracy: ±0.2 Hz (at 23 ±5°C)

5-26

EC750SA

5.5 MISC Menu

5.5 MISC Menu
This menu is used to enter detailed settings for various functions. In this menu, you can also turn the
output on or off.

5.5.1 Sequence (SEQUENCE)
A sequence menu is displayed. This menu is used to control sequences, set up programming, and clear
sequence memory.
a) CONTROLM(sequence control)
Select among the sequence operation control items listed below.

See “4.4.4 Control ofsequence operations”.
Table5-19. Items in CONTROL Selection Box
Item in Selection Box
START
STOP
HOLD
BRAN0
BRAN1

Operation
Starts sequence operations. Switches to Run mode.
Stops sequence operations. Switches to Idle mode.
Holds (pauses) sequence operations. Switches to Hold mode.
Branches to step specified by branch step.
If the branch step is not specified, it is ignored.

The sequence control selection box can be selected only when output is on. If the output on/off key ispressed while this selection box is displayed, the selection box is closed.

5-27

EC750SA

5.5 MISC Menub) PROGRAM (sequence programming)
This “PROGRAM” screen is used to program sequences.
The items listed in Table5-20 to Table5-22 are set for individual steps.
Sequence programming is stored automatically, and the data for AC mode with a 100 V range or a 200
V range is stored separately from the data for AC+DC mode with a 100 V range or a 200 V range.
See “4.4.3 Programming sequence”, for description of sequence programming operation
steps.
Table5-20. PROGRAM Screen Items (1/3)
Setting Name

Item

STEP

Step number

TIME

Step time

DC voltage value
DC VOLT(AC+DC-INT
only)
DC operation typeAC voltage value

AC VOLTAC operation typeOperation
This specifies the step number to be set.
Setting range: 1 to 255
Specifies the continuation time for the specified step.
Setting range:
0.0001 s to 999.9999 s
Setting resolution: 0.0001 s (= 0.1 ms)∗ The time unit can be switched between “s” and “ms” via
the SYSTEM menu “TIME UNIT” setting.
See “5.6.5 Time unit setting”.
Sets the DC voltage value for AC+DC mode.
The setting range is determined by the range setting used
when editing sequence data.
Setting range: 100 V range: −220.0 V to +220.0 V
200 V range: −440.0 V to +440.0 V
Setting resolution: 0.1 V
Sets the method used to change to the specified DC voltage
value.
Select one of the following three options.
• CONST: Output specified value• KEEP: Output value at end of previous step
• SWEEP: Start by outputting value at end of previous
step, then perform a linear sweep to output the
specified value at the end of the current step
Sets the AC voltage value.
The setting range is determined by the range setting enteredwhen editing the sequence data.
Setting range: 100 V range: 0.0 Vrms to 155.0 Vrms
0.0 Vp-p to 440.0 Vp-p
200 V range: 0.0 Vrms to 310.0 Vrms
0.0 Vp-p to 880.0 Vp-p
Setting resolution: 0.1 Vrms/0.1 Vp-p
∗ The voltage value can be set as “Vp-p” only whenarbitrary waveform has been selected.
Sets the method used to change to the specified AC voltage
value.
Select one of the following three options.
• CONST: Output specified value• KEEP: Output value at end of previous step
• SWEEP: Start by outputting value at end of previous
step, previous perform a linear sweep to output
the specified value at the end of the current step

5-28

EC750SA

5.5 MISC Menu

Table5-21. PROGRAM Screen Items (2/3)
Setting Name

Item
AC frequency

FREQ
AC frequency
operation type

Waveform
WAVE

Waveform operation
type
Phase

PHS
Phase operation type

Step synchronizedoutputSYNC CODE

Step synchronizedoutput operation type
Step end phaseenable/disable
STOP PHS
Step end phase

Operation
Sets the AC frequency.
Setting range:
1.0 Hz to 550.0 Hz
Setting resolution: 0.1 Hz
Sets the method used to change to the specified frequency.
Select one of the following three options.
• CONST: Output specified value• KEEP: Output value at end of previous step
• SWEEP: Start by outputting value at end of previous
step, then perform a linear sweep to output thenspecified value at the end of the current step
Selects arbitrary waveform to be output.
Setting range: SIN/SQU/ARB1 to ARB16
Sets the method used to change to the specified waveform.
Select one of the following two options.
• CONST: Output specified waveform• KEEP: Output previous step waveform
Sets output initial phase.
Setting range:
0.0° to 359.9°
Setting resolution: 0.1°
Sets the method used to change to the specified phase.
Select one of the following two options.
• CONST: Output specified phase• KEEP: Output previous step phase
This sets the code (2 bits) to be output in sync with step
execution. The sequence step transitions can checked bymonitoring the step synchronized output.
Bit 0 is output from pin 5 (DOUT5) of the external control
I/O connector and bit 1 is output from pin 6 (DOUT6).
Select one of the following four types of step synchronizedoutput (the H/L are displayed in the order “bit 1, bit 0”).
During Idle mode, these values are “LL”.
• LL
• LH
• HL
• HH
Specifies the output method for step synchronized output.
Select one of the following two options.
• CONST: Output specified code
• KEEP: Output same code as at previous step
Specifies step end phase as enabled or disabled. Select oneof the following two options.
• DISABLE: Disable (phase depends on step time)• ENABLE: Enable
Sets step end phase.
Setting range:
0.0° to 359.9°
Setting resolution: 0.1°

5-29EC750SA

5.5 MISC Menu

Table5-22. PROGRAM Screen Items (3/3)
Setting Name

Item

STEP TERM

Step end

JUMP STEP

Jump step

JUMP NUM

Jump times

BRANCH0

Branch step 0

BRANCH1

Branch step 1

Operation
Sets operation after end of step.
Select one of the following three options.
• CONT: Sequence continuation• STOP: Change to Idle mode
• HOLD: Change to Hold mode
Sets the step number to jump to after the end of theprevious step.
• 0:
Continue to next step number• 1 to 255: Jump to specified step number
Sets the number of times to execute the jump operation
specified by JUMP STEP.
• 0:
Infinite times jump
• 1 to 999: Specified times jump
Sets the step number to jump to when trigger input has
occurred.
Two types of branch steps can be set: BRANCH0 and
BRANCH1.
[Command example]
When a STOP is set after a small number of sweeps at thejump destination step, it enables uses where there is asafe region for saving data if necessary.
• 0:
Branch disabled• 1 to 255: Jump to specified step numberc) MEMORYM(clears sequence memory)
This clears the sequence memory.
When this cleared, the initial value is input.
See “4.4.5 Clear sequence memory”.
See “Table3-1. Settings in Memory”.

5-30

EC750SA

5.5 MISC Menu

5.5.2 Memory (MEMORY)
The “MEMORY” screen is used to control memory.
Settings saved (stored) to store/recall memory No. 1 to No. 30 can be recalled and used.
Recall of store/recall memory contents can be executed only when output is off.
See “4.8 Using Memory Functions”, for description of store/recall memory.
After selecting one of the following operations, use the selection box to specify the target memory
number.
• STORE...:Stores settings to specified memory number.

• RECALL...:

Recalls settings from specified memory number.

• CLEAR...:

Clears settings in specified memory number.

5-31

EC750SA

5.5 MISC Menu

5.5.3 Remote (REMOTE)
The remote menu is displayed. This menu is used to switch to local mode from remote control, switch
interface and set up communication parameters of RS232 interface.
a) Local (LOCAL)
The remote control connected via USB interface or RS232 interface can be used to switch to local modefor operation via the panel screen.
When in remote control mode, the “RMT” icon is displayed.
See “6 REMOTE INTERFACE”.

 Operation steps
1. Select “LOCAL…”, then press the

ENTER

key.

⇒ The EXEC box is displayed.
Displayed during
remote mode
EXEC box
CANCEL

ENTER

2. Make sure “EXEC” has been selected, then press the

ENTER

key.

⇒ This sets local mode.
Nothing is shown here
during local mode.

CANCEL

ENTER-------------- Notes ------------------------------------------------------------------------------------------------- Under local lockout state, LLO icon is displayed.
 Switching to local mode cannot be done via the control panel under local lock out state. To
cancel local lock out, set REN of USB interface to false via a computer.
-----------------------------------------------------------------------------------------------------------------------------

5-32

EC750SA

5.5 MISC Menub) Interface (INTERFACE)
This switches USB interface or RS232 interface.
See “6 REMOTE INTERFACE”, for detailed description of the operation method.
c) RS232
This sets up communication parameters of RS232 interface.
See “6 REMOTE INTERFACE”, for detailed description of the operation method.

5.5.4 System (SYSTEM)The EC750SA system settings are displayed in the “SYSTEM” screen.
See “5.6 System Menu”, for detailed description of the system menu.

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EC750SA

5.5 MISC Menu

5.5.5 Setting range limiter (LIMIT)
The setting range limiter indicates the LIMIT screen, enabling the setting range of output voltage andoutput frequency to be limited when the signal source mode is the internal signal source mode (AC-INT,
AC+DC-INT) or internal + external signal source mode (AC-ADD, AC+DC-ADD), and the setting rangeof the output voltage to be limited when in the external sync mode (AC-SYNC, AC+DC+SYNC).
The numeric values shown in Table5-23 are set on this screen.
See b) Using setting range limit in “3.4.7 Using limiter functions”.
Table5-23. Setting Range Limit (LIMIT)
OutputVoltage
Range
100 V

Setting Range

Resolution

Initial
value

Unit

+0.1 to +220.0

0.1+220.0V

200 V+0.1 to +440.0

0.1+440.0V

100 V−220.0 to −0.1

0.1

−220.0V

200 V−440.0 to −0.1

0.1−440.0V

F Up

Frequency setting upper limit

1.0 to 550.0

0.1

550.0

Hz

F Lo

Frequency setting lower limit

1.0 to 550.0

0.1

1.0

Hz

Setting
Name

Setting+Vo

Positive voltage
setting limit−Vo

Negative voltage
setting limit The setting range limit sets the limit for AC peak value + DC.

For example, when +Vo limit is +200.0 V, and the DC setting has already been set to 100.0 V, theAC limit setting becomes 70.7 Vrms (100.0 Vpk).
 The voltage setting range limit that does not include an output voltage already set cannot be set.
 The same setting range limit is used for all output modes. Not only the currently selected output

mode setting, but the settings for all other modes are restricted by this limit. (The EC750SA
stores the setting for each output mode.)
The following describes an example where the selected output mode is AC-INT and the limit is
set to prevent the output voltage from exceeding 100.0 Vrms.
In this case, the output limit range must be set to ±141.4 V (100.0 Vrms), but this setting cannot
be made unless the output voltage setting is 100.0 Vrms or less for the other output modes where
the output voltage can be set, i.e., the AC-ADD, AC-SYNC, AC+DC-INT, AC+DC-ADD, and
AC+DC-SYNC modes. If the setting for AC-ADD is 110.0 Vrms, the setting range limit cannot
be set within ±155.5 V (110.0 Vrms), even if the setting for the selected AC-INT is 100.0 Vrms.
Memory and sequences are not subject to setting range limits.

5-34

EC750SA

5.5 MISC Menu

5.5.6 Selection of measurement display (MEASURE)
Select the measurement values to be displayed from the RMS value (RMS), average DC (AVG), peakvalue (PEAK), and harmonic current values (HC1 to HC4).
When harmonic current value is selected, the RMS value, average DC, and peak value are not measured.
When measurement of the RMS value, average DC, or peak value has been set, harmonic current is notmeasured.
See “3.4.9 Using measurement functions”, for description of measurement display selection.
See “4.3 Measurement of Harmonic Current” and“5.4.6 Output harmonic current measurement”, for description of harmonic current
measurement.

5.5.7 Reset of peak current hold value
This resets the peak current hold value.
A reset sets the peak current hold value to 0 Apk, and then holds the new peak value.
See “4.2.4 Reset the peak current hold value”, for description of resetting peak current holdvalue.

5-35

EC750SA

5.5 MISC Menu

5.5.8 Output on/off
OUTPUT

The EC750SA output on/off setting can be entered using the

key on the front panel, but it can also

be controlled via the MISC menu.
See “3.4.8 Output on/off ”.

 Operation steps
1. Press theor

CANCEL2. Press the

ENTER

ENTER

key to display the selection box.

CANCEL

ENTER

3. Press the

key to move the cursor to “ON”.

CANCEL4. Press the

key to move the cursor to “OUTPUT”.

ENTER

ENTER

key to turn output on, at which time the output on/off LED goes on.

OUTPUTOUTPUT

Output off

Output on

Output on/off LED is on.

5-36

EC750SA

5.5 MISC Menu

5.5.9 Adjusting DC offset
Even when the output is set to 0 V, the DC offset voltage from several mV to several tens of mV may exist
in the output. The DC offset adjustment function can reduce such DC voltage close to zero.
For the DC offset adjustment, four types of values are retained for each output range and AC/DC mode.
The setting range of the DC offset adjustment value is shown in the Table5-24.
Table5-24. Setting range of DC offset adjustment value

AC

Minimum
value
−50.0

Maximum
value
+50.0

AC+DC

−250

+250

Mode

Resolution

Initial value

Unit

0.1

0.0

mV

1

0

mV

Note The setting range is common to 100 V range and 200 V range.

 Operation steps
1. Press theor

key to move the cursor to “DC ADJUST”.

CANCEL2. Press the

ENTER

ENTER

key to display the modification box.

CANCEL

ENTER

5-37

EC750SA

5.5 MISC Menu

3. Press theandkeys to move the cursor to the column to be changed, turn the MODIFY dialand set a numerical value. The set value will be displayed immediately.

Decrease4.

Increase

After setting all of the columns, press the

CANCEL

5-38

or

ENTER

key to close the modification box.

EC750SA

5.6 System Menu

5.6 System Menu
This menu is used to enter the following system settings for the EC750SA.
• KEYLOCK:

Keylock• BEEP:

Beep• CONTRAST:LCD contrast• COLOR:LCD display color• TIME UNIT:

Time unit• INIT OUT:

Output on/off at power-on• EXT CONTROL: External control input enabled/disabled• RESET...:Reset• INFORMATION: System information display

 “SYSTEM” screen display steps
Selectand then “SYSTEM” in the MISC menu.

1. Press theor

CANCEL

key to move the cursor to the

icon.

ENTER

Cursor

2. Press the

ENTER

Press theCANCEL

key to display the MISC menu.
key to move the cursor to “SYSTEM” .

ENTER

5-39

EC750SA

5.6 System Menu

3. Press the

ENTER

CANCEL4. Press the

key to display the SYSTEM screen .

ENTER

or

key to select the operation to be performed.

5-40

EC750SA

5.6 System Menu

5.6.1 Keylock
The EC750SA is equipped with a function that prevents key input errors during operation.
When “keylock” is on, all keys become inactive except for the keylock off key. Although it is possible toswitch among menus when keylock is on, basically no changes can be made except for turning keylock
off. However, output can still be turned off via the OUTPUT key as an emergency response measure.

 Operation steps
1. Press theor

key to move the cursor to “KEYLOCK”.
CursorCANCEL2. Press the

ENTER

ENTER

key to display the selection box.
Selection box

CANCEL3. Press the

ENTER

or

key to move the cursor to the other keylock setting (i.e., to OFF when on

or to ON when off).

CANCEL4. Press the

ENTER

ENTER

key to complete the setting. Press the

5-41

CANCEL

key to cancel the setting.

EC750SA

5.6 System Menu

5.6.2 Beep sound
When the beep sound is on, a beep sounds when an incorrect operation is made, a key is pressed, or amodify operation is made. When a protection function-related error occurs, an alarm sound will be output
regardless of the beep sound setting.

 Operation steps
1. Press theor

key to move the cursor to “BEEP”.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the selection box.
Selection box

CANCEL3. Press the

ENTER

or

key to move the cursor to the other beep setting (i.e., to OFF when on or

to ON when off).

CANCEL4. Press the

ENTER

ENTER

key to complete the setting. Press the

5-42

CANCEL

key to cancel the setting.

EC750SA

5.6 System Menu

5.6.3 LCD contrast adjustment
The LCD screen contrast level can be set to any of 100 levels to suit the operation environment.
To open the level adjustment text box, press the ENTER key and CANCEL key at the same time. This
enables the contrast to be adjusted even when the current contrast setting does not allow easy recognitionof the LCD display contents. This also moves the digit cursor to the 10’s place.

 Operation steps
1. Press theor

key to move the cursor to “CONTRAST”.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the modification box.

Modification box

CANCEL3. Press the

ENTER

and

keys to move the cursor to the column to be changed, turn the MODIFY dialand set a numerical value. The set value will be displayed immediately.

Decrease

Increase

4. After setting all of the columns, press the

CANCEL

5-43

or

ENTER

key to close the modification box.

EC750SA

5.6 System Menu

5.6.4 LCD display color setting
The display color of the LCD screen on the control panel can be set as either white based (blue text on
white background)or blue based (white text on blue background).

 Operation steps
1. Press theor

key to move the cursor to “COLOR”.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the selection box.

Selection box
CANCEL3. Press the

ENTER

or

key to move the cursor to “BLUE” for blue based or “WHITE” for whitebased.

CANCEL4. Press the

ENTER

ENTER

key to complete the setting. Press the

5-44

CANCEL

key to cancel the setting.

EC750SA

5.6 System Menu

5.6.5 Time unit setting
The unit used to indicate the time parameter can be specified.
Select either “s” (second) or “ms” (millisecond) for this time unit.

 Operation steps
1. Press theor

key to move the cursor to “TIME UNIT”.

CursorCANCEL2. Press the

ENTER

ENTER

key to display the selection box.

Selection box
CANCEL3. Press theor

CANCEL4. Press the

ENTER

ENTER

key to move the cursor to the displayed unit.

ENTER

key to complete the setting. Press the

5-45

CANCEL

key to cancel the setting.

EC750SA

5.6 System Menu

5.6.6 Output on/off setting at power-on
The EC750SA can be set to automatically turn output on at power-on.
However, when restarting after a system lock, the EC750SA will start with output off regardless of thissetting.

 Operation steps
1. Press theor

key to move the cursor to “INIT OUT”.

CursorCANCEL2. Press the

ENTER

CANCEL3. Press the

key to display the selection box.

ENTER

Selection box

ENTER

or

CANCEL4. Press the

ENTER

key to move the cursor to “ON” (when off) or to “OFF” (when on).

ENTER

key to complete the setting. Press the

5-46

CANCEL

key to cancel the setting.

EC750SA

5.6 System Menu

5.6.7 External control input enable/disable setting
External control input can be set as enabled or disabled. However, the EC750SA status will be output evenwhen external control input is set as disabled.
See “4.5 Control Using External Control I/O Connector”, for details of external control
input.

 Operation steps
1. Press theor

CANCEL

key to move the cursor to “EXT CONTROL”.

ENTER

Cursor

2. Press the

ENTER

CANCEL

key to display the selection box.

ENTER

Selection box

3. Press theor

CANCEL4. Press the

ENTER

key to move the cursor to “ENABLE” or “DISABLE”.

ENTER

key to complete the setting. Press the

5-47

CANCEL

key to cancel the setting.

EC750SA

5.6 System Menu

5.6.8 Reset function
This function resets all basic settings to their initial (factory) settings.
The EC750SA cannot be reset when output is on. Always turn output off before resetting the EC750SA.
See “3.2 Display and Initial Settings at Power-on”, for description of the settings after areset.

 Operation steps
1. Press theor

CANCEL

key to move the cursor to “RESET…”.

ENTER

Cursor

2. Press the

ENTER

CANCEL

key to display the EXEC box.

ENTER

EXEC box

3. After selecting “EXEC”, press the

5.6.9

ENTER

key to reset the EC750SA.

System information

Select “INFORMATION” in the “SYSTEM” screen to view system information such as the firmware
version number.
See “8.4 Checking the Version Number”, for description of the operation steps for viewing
this version number.

5-48

EC750SA6. REMOTE INTERFACE

6.1

Remote Interface ............................................................. 6-2

6.1.1 USB ........................................................................... 6-2
6.1.2 RS232 ....................................................................... 6-4
6.2

Command List .................................................................. 6-7

6.3

Command Descriptions .................................................. 6-13

6.3.1 Overview of Programming Language ...................... 6-13
6.3.2 Detailed command descriptions............................... 6-18
6.4

Command Tree .............................................................. 6-49

6.5

Status System ................................................................ 6-50

6.5.1 Status byte .............................................................. 6-51
6.5.2 Standard event status .............................................. 6-52
6.5.3 Operation status ...................................................... 6-54
6.5.4 Warning status ......................................................... 6-55
6.6

Error Message List ......................................................... 6-56

6.7

Programming example ................................................... 6-57

6.8

Programming Precautions ............................................. 6-57

6.9

Notes on Remote Control .............................................. 6-57

6-1

EC750SA

6.1 Remote Interface

6.1 Remote Interface
This product is provided with the USB and RS232 remote interfaces and is remote-controllable by acomputer. The remote control allows almost all the operations performed on the control panel. In addition,
it can read the internal state such as setting values and errors.
Prepare a personal computer equipped with the USB interface when using the USB interface. Install theUSBTMC driver in the computer. Normally, this driver supports the Subclass USB488, so that almost
same control as GPIB can be executed through the USB. This driver is included in the hardware orsoftware products of respective companies that supply the VISA library. The user who does not have thelicense of VISA library must get it additionally.
VISA: Virtual Instrument software Architecture

6.1.1 USB
EC750SA is compliant with the USB Test and Measurement Class (USBTMC). Normally, the USBTMC
class driver supports the subclass USB488 and can perform almost the same controls as GPIB on USB.

 Preparation
The computer used for control needs USBTMC class driver installed on it. The USBTMC class driver is
included in the hardware and software product of each company that provides the VISA library.

 Operation steps
1. Open SYSTEM MENU to open “REMOTE”.

CANCEL

ENTER

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EC750SA

6.1 Remote Interface

2. Press theor

key to move the cursor to “INTERFACE”.

CANCEL3. Press the

ENTER

key to display the selection box.

CANCEL4. Press the

or

ENTER

ENTER

key to move the cursor to “USB”.

CANCEL5. Press the

ENTER

ENTER

key to complete the setting. Press the

CANCEL

key to cancel the setting.

6. Use a commercially available USB cable (Type A to B) to connect this product to the computer.
USB connector is available on the rear of this product.
-------- Notes-------------------------------------------------------------------------------------------------------- Avoid use in a place that has power fluctuation or under electrically noisy environment.
 It is recommended to use a fully-shielded, short cable.
 The use of USB hub may cause the product not to communicate properly.
 Do not turn off the power during USB communication.
-----------------------------------------------------------------------------------------------------------------------------

6-3

EC750SA

6.1 Remote Interface

 USB ID
Used for a system connected with EC750SA through USB, to enable the application identify each source.
The USB ID is represented in the following format.
USB0::[Vendor number]::[Product number]::[Serial number]::INSTR
Vendor number: Fixed to 3402 (0x0D4A)
Product number: Fixed to 12 (0x000C)
Serial number:

A unique number (serial number) has been set for each product.

6.1.2 RS232
For the interface specifications,

See “9.12 External Interface.”

 Operation steps <1>
Enable RS232 by following steps below.
1. Open SYSTEM MENU to open “REMOTE”.

CANCEL2. Press the

or

ENTER

key to move the cursor to “INTERFACE”.

CANCEL

ENTER

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EC750SA

6.1 Remote Interface

3. Press the

ENTER

key to display the selection box.

CANCEL4. Press theor

key to move the cursor to “INTERFACE”.

CANCEL5. Press the

ENTER

ENTER

ENTER

key to complete the setting. Press the

CANCEL

key to cancel the setting.

6. Use a D-sub 9-pin cross cable to connect this product to the computer. The connector is on the rearof EC750SA.

 Operation steps <2>
Set communication parameter by following steps below.
1. Open SYSTEM MENU to open “REMOTE”.

CANCEL

ENTER

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EC750SA

6.1 Remote Interface

2. Press theor

key to move the cursor to “RS232”.

CANCEL3. Press the

ENTER

ENTER

key to display the “RS232” screen.

CANCELENTER

CANCEL

ENTER

4. Set each item.

-------- Notes ---------------------------------------------------------------------------------------------------------- Avoid use in a place that has power fluctuation or under electrically noisy environment.
 Turn off this product and the computer before connecting or disconnecting the cable.
 Binary transmission is not supported.
 To transfer arbitrary waveforms data, using USB interface.
-----------------------------------------------------------------------------------------------------------------------------

6-6

EC750SA

6.2 Command List

6.2 Command List
The EC750SA command list is shown in Table6-1 to Table6-9 and IEEE488.2 common commands
supported by the EC750SA are listed in Table6-11.
The symbols used in Table6-1 to Table6-11 are explained below. The lowercase letters in each keyword
can be omitted.
• Square brackets indicate keywords that can be omitted. (Implicit keywords)• A vertical bar ( | ) indicates that one of several keywords is selected.
Table6-1. Command List (SOURce Subsystem)(1/2)
Function

Command

RMS current limiter[SOURce:]CURRent:LIMit:RMS

Average current limiter[SOURce:]CURRent:LIMit:AVErage Note

Peak current limiter (positive)[SOURce:]CURRent:LIMit:PEAK:HIGH

Peak current limiter (negative)[SOURce:]CURRent:LIMit:PEAK:LOW

Output frequency[SOURce:]FREQuency[:IMMediate]

Frequency upper limit setting limit[SOURce:]FREQuency:LIMit:HIGH

Frequency lower limit setting limit[SOURce:]FREQuency:LIMit:LOW

Output waveform[SOURce:]FUNCtion[:SHAPe][:IMMediate]

Output mode

[SOURce:]MODE

Sync signal source (external
synchronization mode)[SOURce:]PHASe:CLOCk

Phase when output is started[SOURce:]PHASe[:IMMediate]

Sequence status[SOURce:]SEQuence:CONDition?

Step number during execution[SOURce:]SEQuence:CSTep?

Maximum number of steps in sequence[SOURce:]SEQuence:LEN?

Jump number of times in step specified by
SEQ:STEP command[SOURce:]SEQuence:COUNt?

Clear sequence memory[SOURce:]SEQuence:DELete

Step execution parameter[SOURce:]SEQuence:EPARameter

Step transition parameter[SOURce:]SEQuence:TPARameter

Target step number for sequence editing[SOURce:]SEQuence:STEP

AC output voltage[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]

Output voltage upper limit setting limit[SOURce:]VOLTage:LIMit:HIGH

Output voltage lower limit setting limit[SOURce:]VOLTage:LIMit:LOW

DC output voltage(during AC+DC-INT, AC+DC-ADD, or
AC+DC-SYNC mode)[SOURce:]VOLTage:OFFSet[:IMMediate]

Note This command is compatible with EC1000S.
(

See “
[SOURce:]CURRent:LIMit:AVErage” on page 6-19.)

6-7

EC750SA

6.2 Command List

Table6-2. Command List (SOURce Subsystem)(2/2)
Function

Command

DC offset voltage adjustment(during AC-INT, AC-ADD, or AC-SYNC [SOURce:]VOLTage:ADJust:OFFSet:AC
mode)
DC offset voltage adjustment(during AC+DC-INT, AC+DC-ADD, or [SOURce:]VOLTage:ADJust:OFFSet:DC
AC+DC-SYNC mode)
Output voltage range[SOURce:]VOLTage:RANGe
Table6-3. Command List (MEASure Subsystem)

Function

Command

Output current RMS value

MEASure[:SCALar]:CURRent[:AC]?

Maximum current value

MEASure[:SCALar]:CURRent:HIGH?

Minimum current value

MEASure[:SCALar]:CURRent:LOW?

Output current peak value hold

MEASure[:SCALar]:CURRent:AMPLitude:MAX?

Output current peak value hold reset

MEASure[:SCALar]:CURRent:AMPLitude:RESet?

Output current average value

MEASure[:SCALar]:CURRent:AVErage?

Load crest factor

MEASure[:SCALar]:CURRent:CREStfactor?

Output harmonic current [Arms]

MEASure[:SCALar]:CURRent:HARMonic[:AMPLitude]?

Output harmonic current [%]MEASure[:SCALar]:CURRent:HARMonic:RATio?

External input signal frequency

MEASure[:SCALar]:FREQuency?

Apparent power

MEASure[:SCALar]:POWer:AC:APParent?

Output power factor

MEASure[:SCALar]:POWer:AC:PFACtor?

Reactive power

MEASure[:SCALar]:POWer:AC:REACtive?

Effective power

MEASure[:SCALar]:POWer:AC[:REAL]?

Output voltage RMS value

MEASure[:SCALar]:VOLTage[:AC]?

Maximum voltage value

MEASure[:SCALar]:VOLTage:HIGH?

Minimum voltage value

MEASure[:SCALar]:VOLTage:LOW?

Output voltage average value

MEASure[:SCALar]:VOLTage:AVErage?

Table6-4. Command List (DISPlay Subsystem)
Function
Select measurement display

Command
DISPlay[:WINDow]:MEASure:MODE

6-8

EC750SA

6.2 Command List

Table6-5. Command List (STATus Subsystem)
Function

CommandOperation condition register

STATus:OPERation:CONDition?

Operation event enable register

STATus:OPERation:ENABle

Operation event register

STATus:OPERation[:EVENt]?
STATus:OPERation:NTRansition

Operation transition filter

STATus:OPERation:PTRansition

Warning event condition register

STATus:WARNing:CONDition?

Warning event enable register

STATus:WARNing:ENABle

Warning event register

STATus:WARNing[:EVENt]?

Warning event transition filter

STATus:WARNing:NTRansition
STATus:WARNing:PTRansition

Table6-6. Command List (OUTPut Subsystem)
Function
Output on/off

Command
OUTPut[:STATe]

Table6-7. Command List (INPut Subsystem)
Function
External input gain

Command
INPut:GAIN

Table6-8. Command List (TRACe Subsystem)
Function

Command

Arbitrary waveform name list

TRACe:CATalog?

Send/receive arbitrary waveform data

TRACe[:DATA]

Clear arbitrary waveform memory

TRACe:DELete:[NAME]

6-9

EC750SA

6.2 Command List

Table6-9. Command List (SYSTem Subsystem)
Function

Command

Beep sound on/off

SYSTem:BEEPer:STATe

External control input enable/disable

SYSTem:CONFigure:EXTIO

Error query

SYSTem:ERRor?

Output at power-on

SYSTem:PON[:OUTPut]Time unit for sequence step execution

SYSTem:TUNit

Clear warning

SYSTem:WRELease
Table6-10. Command List (PROGram Subsystem)
Function

Sequence operation control

CommandPROGram[:SELected]:EXECute

6-10

EC750SA

6.2 Command List

Table6-11. Common Command List (Common Commands and Queries)
Common Commands
Nameand Queries*CLS
Clear command

Clears standard event register, etc.

*ESE

Standard event enable command

Sets standard event enable register.

*ESR?

Standard event register query

Queries standard event register.

*IDN?

Identification query

Queries device ID information.

*OPC

Operation complete command

When device operation is completed, thestandard event register operation complete
message (OPC) is generated.

*RCL

Recall command

Reads contents of specified setting memory.

Function

Executes device reset.
*In this device, the processing that is
performed is similar to initializing thesetting memory.

*RST

Reset command*SAV

Store command

Saves contents of specified setting memory.

*SRE

Service request enable command

Queries settings in the service request enableregister.

*STB?

Read status byte query

Queries status byte and master summary
status bit.

*TST?

Self test query

Executes auto test of device and returns theresults.
*For this device, “0” is always returned.

*WAI

Sets device in wait mode until all operations
are completed.

Wait to continue command

6-11

EC750SA

6.2 Command Lista) Input buffer The number of commands that can be sent at one time is limited by the input buffer capacity(10,000 characters).
 The transferred commands are first stored in the input buffer, then successively interpreted

and executed.
 When commands are being interpreted and executed, an error occurs if an illegal command isfound. That command and those following will not be executed.
 When command interpretation and execution are completed, the input buffer is cleared toenable input of more commands.

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EC750SA

6.3 Command Descriptions

6.3 Command Descriptions
6.3.1 Overview of Programming Language
This products conforms to IEEE488.2 and SCPI (VERSION 1999.0).
a) SCPISCPI defines methods used for communications between computers and measuring instruments. For
the general information about SCPI, refer to documents separately.

6-13

EC750SA

6.3 Command Descriptionsb) SCPI data format
All command messages and acknowledge messages sent to the EC750SA are in “ASCII” format.
Table6-12. Numerical Value Data Format
SymbolData Format<NR1>

Numerical values without a decimal point (decimal position is to the right of thesmallest digit in value) Example: 273<NR2>

Numerical value with an explicit decimal point Example: .0273<NR3>

Numerical value with an explicit decimal point and an exponent. Example:2.73E+2<Bool>

Boolean value (logical value) Example: 0 | 1 or ON | OFF
Table6-13. Character Data Format

SymbolData Format<CRD>

Character format Example: SIN<SRD>Character format with double quotations Example: “No error”

 Binary block data format

The binary block data format is shown in Figure 6-1.

Non-zeronumerals

Numerals

8-bit data byte

Figure 6-1. Binary Block Data
The “non-zero numeral” element value indicates the number of “numeral” elements that follow
afterward. The “numeral” element value indicates the number of “8-bit data byte” elements that
follow afterward.
For example, the format is as follows when sending four of the 8-bit data byte <DAB>.
#14<DAB><DAB><DAB><DAB>c) Common commands
The common commands are used to provide overall control of device functions, such as device resetand status monitoring. These common commands have three-letter names that start with an asterisk
(*).

6-14

EC750SA

6.3 Command Descriptionsd) Subsystem commands
Subsystem commands are commands used to execute the particular functions of devices.
Subsystem commands correspond to a measuring instrument internal function groups, with several
sets divided into groups. Each subsystem command has a tree structure, and colon (:) is defined as apath separators.
1) SCPI command tree
Figure 6-2 shows a partial command tree of subsystem commands.
See Figure 6-3 for an overview of the command tree.

Figure 6-2. Partial Command Tree

 Root level

The command tree top level is the root. With SCPI, the current path is set to the root, as shown
below.
○ Immediately after the device power source goes on○ When the device receives a “root specifier”
The root specifier is a colon (:) that is attached to the start of a command string to indicatethat the current path is set to the root.
○ When the device has received a “message terminator”
The message terminator is a line feed (LF) at the end of an SCPI message. The current path isreturned to the root level when the device receives a message terminator.

 Current path

The current path is a command level within the command tree, which specifies the command
level that will be searched first when the user sends a command.

6-15

EC750SA

6.3 Command Descriptions

2) Path separator
The path separator (:) separates the current keyword from the keyword at the next lower level. Eachtime a colon (:) is detected in a command string, the current path is moved one level downward.
When a colon (:) appears at the start of a command string, it indicates that the current path is set to theroot. This starting colon (:) also can be freely omitted.
When a semicolon (;) is used to separate a command string, subsystem command on the same levelcan be accessed without changing the current path.

:SOUR:FREQ 50

FREQuency command, belongs to SOURce subsystem
SOURce subsystem command (SOURce is root command)
Sets current path to root

3) Abbreviation of command string
The command syntax enables each command (including certain parameters) to be written as a
combination of uppercase and lowercase letters. The uppercase letters in the command can be used as
an abbreviation of the command.
Moreover, this distinction between uppercase and lowercase letters in the command syntax exists justfor the sake of convenience, since commands are not actually case sensitive. Note that abbreviation
examples <1> to <3> below can be entered, but an error will occur if example <4> or <5> is entered.
Abbreviation examples for SOURce:FREQuency?
 <1> “SOUR:FREQ?” <2> “SOURCE:FREQUENCY?”
 <3> “sour:freq?”×<4> “SOURC:FREQUE?”×<5> “sou:frequency?”

6-16

EC750SA

6.3 Command Descriptions4) Implicit keywords
Any keyword that is enclosed by square brackets ([ ]) is an implicit keyword that can be omitted.
Abbreviated command string examples <1> to <5> below all send the same setting to the target
device.
Abbreviation examples for [:SOURce]:VOLTage[:LEVel][:IMMediate][:AMPLitude]<1> “:SOUR:VOLT:LEV:IMM:AMPL 10”<2> “:VOLT:LEV:IMM:AMPL 10”<3> “:VOLT:LEV 10”<4> “:VOLT 10”<5> “:SOUR:VOLT:AMPL 10”

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EC750SA

6.3 Command Descriptions

6.3.2 Detailed command descriptions
The following describes various command functions and syntax.
a) Meanings of symbols• Angle brackets (< >):Parameter symbols are enclosed in angle brackets. For example, <NR1>
indicates the digital data format (NR1 type).

• A vertical bar ( | )A parameter is used to alternative parameters. For example, “FIX|STEP”
indicates that either “FIX” or “STEP” can be used as a parameter.

• Square brackets ([ ])An option header is enclosed by square brackets. For example,“[SOURce:]LIST” indicates that “SOURce:” can be omitted.

• Bold (boldface)

Boldface characters are used to emphasize a syntax string when acommand is defined, such as TRIGger:SOURCe<NRf>.

•A triangular symbol is used to explicitly indicate that a space exists.

b) Remark• Commands and queries are both included as EC750SA commands, but for simplicity both arereferred to as commands.
Any command that includes a question mark (?) with a keyword is a query.
• Headers are not applied to command reply messages.

c) SOURce subsystem

 [SOURce:]CURRent:LIMit:RMS
This sets the upper limit for the output RMS current. The output RMS current limiter setting
ranges from 1.0 A to 10.5 A (for 100 V range) or from 1.0 A to 5.3 A (for 200 V range).
Syntax:[SOURce:]CURRent:LIMit:RMS
<NR2>

Parameter:

1.0 to 10.5 (1.0 to 5.3)

Command example:

CURR:LIM:RMS 5

Query example:

CURR:LIM:RMS?

Response format:<NR2>

Response example:

5.0

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EC750SA

6.3 Command Descriptions

 [SOURce:]CURRent:LIMit:AVErage
This sets the upper limit for the output RMS current. The output RMS current limiter setting
ranges from 1.0 A to 10.5 A (for 100 V range) or from 1.0 A to 5.3 A (for 200 V range). To keepcompatible with EC1000S, current average limiter command of EC1000S can be used as RMS
limiter command of EC750SA.
Syntax:[SOURce:]CURRent:LIMit:AVErage<NR2>

Parameter:

1.0 to 10.5 (1.0 to 5.3)

Command example:

CURR:LIM:AVE 5

Query example:

CURR:LIM:AVE ?

Response format:<NR2>

Response example:

5.0

 [SOURce:]CURRent:LIMit:PEAK:HIGH
This sets the upper limit of the output peak current (positive polarity). The output peak current
limiter (positive polarity) setting ranges from 10.0 A to 31.5 A (for 100 V range) or from 5.0 A to
15.8 A (for 200 V range).
Syntax:[SOURce:]CURRent:LIMit:PEAK:HIGH<NR2>

Parameters:

10.0 to 31.5 (5.0 to 15.8)

Command example:

CURR:LIM:PEAK:HIGH 10

Query example:

CURR:LIM:PEAK:HIGH?

Response format:<NR2>

Response example:

10.0

 [SOURce:]CURRent:LIMit:PEAK:LOW
This sets the upper limit for output peak current (negative polarity). The output peak current
limiter (negative polarity) setting ranges from −31.5 A to −10.0 A (for 100 V range) or from −15.8
A to −5.0 A (for 200 V range).
Syntax:[SOURce:]CURRent:LIMit:PEAK:LOW<NR2>

Parameters:−31.5 to −10.0(−15.8 to −5.0)

Command example:

CURR:LIM:PEAK:LOW −10

Query example:

CURR:LIM:PEAK:LOW?

Response format:<NR2>

Response example:

−10.0

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EC750SA

6.3 Command Descriptions

 [SOURce:]FREQuency[:IMMediate]This sets the output frequency. When in AC-EXT/AC-SYNC/AC+DC-EXT/AC+DC-SYNC
mode, the frequency cannot be set. ([3, “Invalid in this mode”] error occurs.)
The frequency setting ranges from 1.0 Hz to 550.0 Hz.
Syntax:[SOURce:]FREQuency[:IMMediate]
<NR2>

Parameters:

1.0 to 550.0

Command example:

FREQ 50

Query example:

FREQ?

Response format:<NR2>

Response example:

50.0

 [SOURce:]FREQuency:LIMit:HIGH
This sets the upper limit of the frequency that can be set. However, a value that is equal to or lower
than the currently set frequency cannot be set. ([5, “Out of Limiter”] error occurs.)
The limit value setting ranges from 1.0 Hz to 550.0 Hz.
Syntax:[SOURce:]FREQuency:LIMit:HIGH<NR2>

Parameters:

1.0 to 550.0

Command example:

FREQ:LIM:HIGH 550

Query example:

FREQ:LIM:HIGH?

Response format:<NR2>

Response example:

550.0

 [SOURce:]FREQuency:LIMit:LOW
This sets the lower limit of the frequency that can be set. However, a value that is equal to or
higher than the currently set frequency cannot be set. ([5, “Out of Limiter”] error occurs.)
The limit value setting ranges from 1.0 Hz to 550.0 Hz.
Syntax:[SOURce:]FREQuency:LIMit:LOW<NR2>

Parameters:

1.0 to 550.0

Command example:

FREQ:LIM:LOW 50

Query example:

FREQ:LIM:LOW?

Response format:<NR2>

Response example:

50.0

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EC750SA

6.3 Command Descriptions

 [SOURce:]FUNCtion[:SHAPe][:IMMediate]This sets the output waveform. The output waveform setting is SIN/SQU/ARB1 to ARB16.
When in AC-EXT/AC+DC-EXT mode, the output waveform cannot be set. ([3, “Invalid in thismode”] error occurs.)
Syntax:[SOURce:]FUNCtion[:SHAPe][:IMMediate]
<CRD>

Parameters:

SIN/SQU/ARB1 to ARB16

Command example:

FUNC SIN

Query example:

FUNC?

Response format:<CRD>

Response example:

SIN

 [SOURce:]MODEThis sets the output mode. There are eight output modes, each of them is a combination of one
operation mode (AC or AC+DC) and one signal source mode, (INT, EXT, ADD, or SYNC).
Consequently, the output mode setting is AC-INT, AC-EXT, AC-ADD, AC-SYNC, AC+DC-INT,
AC+DC-EXT, AC+DC-ADD, or AC+DC-SYNC.
However, when output is on, the output mode cannot be changed. ([1, “Invalid with output on”]
error occurs.)
Syntax:[SOURce:]MODE<CRD>

Parameters:

AC-INT/AC-EXT/AC-ADD/AC-SYNC/ACDC-INTACDC-EXT/ACDC-ADD/ACDC-SYNC

Command example:

MODE ACDC-INT

Query example:

MODE?

Response format:<CRD>

Response example:

ACDC-INT

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EC750SA

6.3 Command Descriptions

 [SOURce:]PHASe:CLOCk
This sets the sync signal source in the external synchronization mode (AC-SYNC or
AC+DC-SYNC). The sync signal source setting is either LINE (line synchronization) or EXT(external synchronization). However, when output is on, the sync signal source cannot be changed.
([1, “Invalid with output on”] error occurs.)
Unless the mode is AC-SYNC or AC+DC-SYNC mode, the sync signal source setting cannot be
set. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]PHASe:CLOCk
<CRD>

Parameters:

LINE/EXT

Command example:

PHAS:CLOC EXT

Query example:

PHAS:CLOC?

Response format:<CRD>

Response example:

EXT

 [SOURce:]PHASe[:IMMediate]This sets the phase at the start of output. The phase setting range is 0.0° to 359.9°. However, when
output is on, the phase setting cannot be changed. ([1, “Invalid with output on”] error occurs.)
When in AC-EXT or AC+DC-EXT mode, the phase setting cannot be set. ([3, “Invalid in thismode”] error occurs.)
Syntax:[SOURce:]PHASe[:IMMediate]
<NR2>

Parameters:

0.0 to 359.9

Command example:

PHAS 90

Query example:

PHAS?

Response format:<NR2>

Response example:

90.0

 [SOURce:]SEQuence:CONDition?
This returns the sequence status. The response message is 0 (Idle mode), 1 (Run mode), or 2 (Holdmode).
Syntax:[SOURce:]SEQuence:CONDition?

Parameters:

None

Query example:

SEQ:COND?

Response format:<NR1>

Response example:

0

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EC750SA

6.3 Command Descriptions

 [SOURce:]SEQuence:CSTep?
This returns the step number being executed. The response ranges from −1 and 1 to 255. −1 isreturned in the idle mode.
Syntax:[SOURce:]SEQuence:CSTep?

Parameters:

None

Query example:

SEQ:CST?

Response format:<NR1>

Response example:2

 [SOURce:]SEQuence:LEN?
This returns the maximum number of sequence steps. 255 is always returned.
Syntax:[SOURce:]SEQuence:LEN?

Parameters:

None

Query example:

SEQ:LEN?

Response format:<NR1>

Response example:255

 [SOURce:]SEQuence:COUNt?
This returns the jump times of the step specified by SEQ:STEP. Response range of the number ofthe jump times is -1 to 999. In the idle mode, −1 is returned.
Syntax:[SOURce:]SEQuence:COUNt?

Parameters:

None

Query example:

SEQ:COUN?

Response format:<NR1>

Response example:

2

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EC750SA

6.3 Command Descriptions

 [SOURce:]SEQuence:DELete
This clears the sequence memory. When this command is executed, all sequence step settings arecleared.
However, the sequence memory contains a separate sequence for each operation mode (AC and
AC+DC) and each output voltage range (100 V and 200 V), for a total of four combined sets.
When sequence memory is cleared by this command, only one of these four sets is selected as thememory.
When in AC-EXT, AC-SYNC, AC+DC-EXT, or AC+DC-SYNC mode, sequence memory cannot
be cleared. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]SEQuence:DELete<NR1>

Parameters:

1

Command example:

SEQ:DEL 1

Response format:

None

Response example:

None [SOURce:]SEQuence:EPARameter
This sets the step execution parameters.
The target sequence step must be already set by the SEQ:STEP. (See“[SOURce:]SEQuence:STEP” on page 6-27.)
However, the first parameter (DC voltage) and second parameter (DC voltage operation type) are
valid only during AC+DC mode. When in AC mode, dummy values should be set. A “0” isreturned for each of these parameters when in AC mode.
The unit of the third parameter varies depending on the waveform set by the seventh parameter.
For the sine wave (SIN) and square wave (SQU), it is Vrms, and for the arbitrary waveform (ARB)
it is Vp-p.
When in AC-EXT, AC-ADD, AC-SYNC, AC+DC-EXT, AC+DC-ADD, or AC+DC-SYNC mode,
step execution parameters cannot be set or queried. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]SEQuence:EPARameter<NR2>, <NR1>......

First parameter (DC voltage [V])
Type

<NR2>

Range

−220.0 to 220.0 (−440.0 to 440.0)

Second parameter (DC voltage operation type)
Type

<NR1>

Range

0 (CONST), 1 (KEEP), or 2 (SWEEP)

Third parameter (AC voltage [Vrms]/[Vp-p])* The unit varies according to the waveform set by the seventh parameter.
Type

<NR2>

Range

0.0 [Vrms] to 155.0 [Vrms] or 0.0 [Vp-p] to 440.0 [Vp-p](0.0 [Vrms] to 310.0 [Vrms] or 0.0 [Vp-p] to 880.0 [Vp-p])

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6.3 Command Descriptions

Fourth parameter (AC voltage operation type)
Type

<NR1>

Range

0 (CONST), 1 (KEEP), or 2 (SWEEP)

Fifth parameter (frequency)
Type

<NR2>

Range

1.0 to 550.0

Sixth parameter (frequency operation type)
Type

<NR1>

Range

0 (CONST), 1 (KEEP), or 2 (SWEEP)

Seventh parameter (waveform)*The unit for the third parameter AC voltage varies depending on the seventh parameter setting.
Type

<NR1>

Range

0 (SIN), 1 (SQU), or 2 to 17 (ARB1 to ARB16)

Eighth parameter (waveform operation type)
Type

<NR1>

Range

0 (CONST) or 1 (KEEP)

Ninth parameter (start phase)
Type

<NR2>

Range

0.0 to 359.9

10th parameter (start phase operation)
Type

<NR1>

Range

0 (CONST) or 1 (KEEP)

11th parameter (step synchronized output)
Type

<NR1>

Range

0 (LL), 1 (LH), 2 (HL), or 3 (HH)

12th parameter (step synchronized output operation type)
Type

<NR1>

Range

0 (CONST) or 1 (KEEP)

Command example: SEQ:EPAR 0, 0, 100.0, 0, 50.0, 0, 1, 0, 90.0, 0, 0, 0
Query example:
Response example:

SEQ:EPAR?
0, 0, 100.0, 0, 50.0, 0, 1, 0, 90.0, 0, 0, 0

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6.3 Command Descriptions

 [SOURce:]SEQuence:TPARameter
This sets the step transition parameters.
The target sequence step must be set in advance by the SEQ:STEP. (See“[SOURce:]SEQuence:STEP” on page 6-27.)
Use SYST:TUN (See “
 SYSTem:TUNit” on page 6-43) in advance to set the unit for thesequence step execution time or query the unit.
When in AC-EXT, AC-SYNC, AC+DC-EXT, or AC+DC-SYNC mode, the step transition
parameter cannot be set. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]SEQuence:TPARameter<NR2>, <NR1>......

First parameter (step time [s]/[ms])
Type

<NR2>

Range

0.0001 to 999.9999 [s]
0.1 to 999999.9 [ms]Second parameter (step end phase setting mode)
Type

<NR1>

Range

0 (disable) or 1 (enable)

Third parameter (step end phase [°])
Type

<NR2>

Range

0.0 to 359.9

Fourth parameter (step termination)
Type

<NR1>

Range

0 (continue), 1 (end), or 2 (hold)

Fifth parameter (jump step number)
Type

<NR1>

Range

0 (next step), 1 to 255

Sixth parameter (jump times)
Type

<NR1>

Range

0 (infinite times), 1 to 999

Seventh parameter (branch 0)
Type

<NR1>

Range

0 (disabled), 1 to 255

Eighth parameter (branch 1)
Type

<NR1>

Range

0 (disabled), 1 to 255

Command example: SEQ:TPAR 2, 1, 180, 0, 0, 1, 0, 0
Query example:

SEQ:TPAR?

Response example: 2, 1, 180, 0, 0, 1, 0, 0

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6.3 Command Descriptions

 [SOURce:]SEQuence:STEP
Specifies the target step number for sequence editing. The step number specification ranges from 1
to 255.
Syntax:[SOURce:]SEQuence:STEP<NR1>

Parameters:

1 to 255

Command example:

SEQ:STEP 1

Query example:

SEQ:STEP?

Response format:<NR1>

Response example:1

 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]
AC output voltage is set using the Vrms unit (when the waveform is SIN or SQU) or the Vp-p unit
(when the waveform is ARB). For the 100 V range, output voltage setting ranges from 0.0 Vrms to155.0 Vrms or from 0.0 Vp-p to 440.0 Vp-p, and for the 200 V range, it ranges from 0.0 Vrms to
310.0 Vrms or from 0.0 Vp-p to 880.0 Vp-p.
When in AC-EXT or AC+DC-EXT mode, the output AC voltage cannot be set or queried. ([3,“Invalid in this mode”] error occurs.)
Syntax:[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]
<NR2>Parameters:

0.0 to 155.0/0.0 to 440.0 (0.0 to 310.0/0.0 to 880.0)

Command example:

VOLT 100

Query example:

VOLT?

Response format:<NR2>

Response example:

100.0

 [SOURce:]VOLTage:LIMit:HIGH
This sets the upper limit of the output voltage that can be set. However, a value that is equal to or
lower than the currently set cannot be specified. ([5, “Out of Limiter”] error occurs.)
For the 100 V range, the limit value setting ranges from 0.1 V to 220.0 V, and for the 200 V range,
it ranges from 0.1 V to 440.0 V.
Syntax:[SOURce:]VOLTage:LIMit:HIGH<NR2>

Parameters:

0.1 to 220.0 (0.1 to 440.0)

Command example:

VOLT:LIM:HIGH 200

Query example:

VOLT:LIM:HIGH?

Response format:<NR2>

Response example:

200.0

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6.3 Command Descriptions

 [SOURce:]VOLTage:LIMit:LOW
This sets the lower limit of the output voltage that can be set. However, a value that is equal to or
higher than the currently set cannot be specified. ([5, “Out of Limiter”] error occurs.)
For the 100 V range, the limit value setting ranges from −220.0 to −0.1 V, and for the 200 V range,
it ranges from −440.0 to −0.1 V.
Syntax:[SOURce:]VOLTage:LIMit:LOW<NR2>

Parameters:−220.0 to −0.1 (−440.0 to −0.1)

Command example:

VOLT:LIM:LOW −200

Query example:

VOLT:LIM:LOW?

Response format:<NR2>

Response example:−200.0 [SOURce:]VOLTage:OFFSet[:IMMediate]This sets the DC voltage when in AC+DC-INT, AC+DC-ADD, or AC+DC-SYNC mode. For the
100 V range, the DC output voltage setting ranges from −220.0 V to 220.0 V, and for the 200 V
range, it range, from −440.0 V to 440.0 V.
The DC output voltage cannot be set unless the mode is AC+DC-INT, AC+DC-ADD, or
AC+DC-SYNC mode. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]VOLTage:OFFSet[:IMMediate]
<NR2>

Parameters:−220.0 to 220.0 (−440.0 to 440.0)

Command example:

VOLT:OFFS 10

Query example:

VOLT:OFFS?

Response format:<NR2>

Response example:

10.0

 [SOURce:]VOLTage:ADJust:OFFSet:AC
This sets the DC offset voltage adjustment value in mV when in AC-INT, AC-EXT, AC-ADD,
AC-SYNC mode. It ranges from −50.0 mV to 50.0 mV. (The setting range is common to 100 V
range and 200 V range.)
The DC offset voltage adjustment value cannot be set unless the mode is AC-INT, AC-EXT,
AC-ADD, AC-SYNC mode. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]VOLTage:OFFSet:AC<NR2>

Parameters:−50.0 to 50.0

Command example:

VOLT:ADJ:OFFS:AC 10

Query example:

VOLT:ADJ:OFFS:OFFS:AC?

Response format:<NR2>

Response example:

10.0

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6.3 Command Descriptions

 [SOURce:]VOLTage:ADJust:OFFSet:DC
This sets the DC offset voltage adjustment value in mV when in AC+DC-INT, AC+DC-EXT,
AC+DC-ADD, AC+DC-SYNC mode. It ranges from −250.0 mV to 250.0 mV. (The setting range
is common to 100 V range and 200 V range.)
The DC offset voltage adjustment value cannot be set unless the mode is AC-INT, AC-EXT,
AC-ADD, AC-SYNC mode. ([3, “Invalid in this mode”] error occurs.)
Syntax:[SOURce:]VOLTage:OFFSet:DC<NR2>

Parameters:−250.0 to 250.0

Command example:

VOLT:ADJ:OFFS:DC 10

Query example:

VOLT:ADJ:OFFS:OFFS:DC?

Response format:<NR2>

Response example:

10.0

 [SOURce:]VOLTage:RANGeThis sets the output voltage range. The output voltage range setting is 100 V or 200 V.
However, when output is on, output voltage range cannot be changed. ([1, “Invalid with outputon”] error occurs.)
Syntax:[SOURce:]VOLTage:RANGe<NR1>

Parameters:

100/200

Command example:

VOLT:RANG 100

Query example:

VOLT:RANG?

Response format:<NR1>

Response example:

100

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6.3 Command Descriptionsd) MEASure subsystem

 MEASure[:SCALar]:CURRent[:AC]?
This returns the output current RMS value (AC+DC RMS value) in Arms units. The output current
RMS value measurement full scale is 15.00 Arms. If the measured value exceeds the measurement
range, 99.99 Arms is returned as a measurement error.
Syntax:

MEASure[:SCALar]:CURRent[:AC]?

Parameters:

None

Query example:

MEAS:CURR?

Response format:<NR2>

Response example:

12.85

 MEASure[:SCALar]:CURRent:HIGH?
This returns the highest current peak value (AC+DC peak value) in Apk units. The highest current
peak value measurement full scale is ±45.0 Apk. If the measured value exceeds the measurement
range, 99.9 Apk is returned as a measurement error.
Syntax:

MEASure[:SCALar]:CURRent:HIGH?

Parameters:

None

Query example:

MEAS:CURR:HIGH?

Response format:<NR2>

Response example:

25.9

 MEASure[:SCALar]:CURRent:LOW?
This returns the lowest current peak value (AC+DC peak value) in Apk units. The lowest current
peak value measurement full scale is ±45.0 Apk. If the measured value exceeds the measurement
range, −99.9 Apk is returned as a measurement error.
Syntax:

MEASure[:SCALar]:CURRent:LOW?

Parameters:

None

Query example:

MEAS:CURR:LOW?

Response format:<NR2>

Response example:

−35.7

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6.3 Command Descriptions

 MEASure[:SCALar]:CURRent:AMPLitude:MAX?
This returns the output current peak value (hold) in Apk units. The held output current peak value
full scale is 45.0 Apk. If the measured value exceeds the measurement range, 99.9 Apk is returned
as a measurement error.
Syntax:

MEASure[:SCALar]:CURRent:AMPLitude:MAX?

Parameters:

None

Query example:

MEAS:CURR:AMPL:MAX?

Response format:<NR2>

Response example:

26.5

 MEASure[:SCALar]:CURRent:AMPLitude:RESet
This resets the stored output current peak value (hold) to 0 Apk.
Syntax:

MEASure[:SCALar]:CURRent:AMPLitude:RESet<NR1>

Parameters:

1

Command example:

MEAS:CURR:AMPL:RES 1

Response format:

None

Response example:

None

 MEASure[:SCALar]:CURRent:AVErage?
This returns the output current average value (AC+DC average value) in a units. The output
current average value measurement full scale is ±15.00 A. If the measured value exceeds themeasurement range, 99.99 A is returned as a measurement error.
Syntax:

MEASure[:SCALar]:CURRent:AVErage?

Parameters:

None

Query example:

MEAS:CURR:AMPL?

Response format:<NR2>

Response example:

1.23

 MEASure[:SCALar]:CURRent:CREStfactor?
This returns the output current crest factor. The crest factor measurement full scale is 50.00. If themeasured value exceeds the measurement range, 99.99 is returned as a measurement error.
The crest factor is calculated as “current peak value/current RMS value”.
Syntax:

MEASure[:SCALar]:CURRent:CREStfactor?

Parameters:

None

Query example:

MEAS:CURR:CRES?

Response format:<NR2>

Response example:

1.41

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6.3 Command Descriptions

 MEASure[:SCALar]:CURRent:HARMonic[:AMPLitude]?
This returns the harmonic current in Arms units within the specified harmonic order range. The
harmonic current measurement range is 15.00 Arms. If the measured value exceeds the full scale,
99.99 Arms is returned as a measurement error.
Before sending a query, change the measurement display selection to HCx which contains the
harmonic order need to be measured using DISP[:WIND]:MEAS:MODE.(See“DISPlay[:WINDow]:MEASure:MODE” on page 6-36.) If the measurement display of
harmonic current (HCx) does not contain the harmonic order, the measurement value will becomeindefinite.
Syntax:

MEASure[:SCALar]:CURRent:HARMonic[:AMPLitude]?
<NR1>Parameters:

1 (first to 10th), 2 (11th to 20th), 3 (21st to 30th), and 4 (31st to 40th)

Query example:

MEAS:CURR:HARM? 1

Response format:<NR2>

Response example:

2.24, 0.02, 0.01, 0.15, 0.06, 0.08, 0.01, 0.01, 0.02, 0.06

 MEASure[:SCALar]:CURRent:HARMonic:RATio?
This returns the ratio (%) of the nth harmonic current to the fundamental wave current as 100 %.
The measurement range is 0.0 % to 500.0 %. When the measured value exceeds the measurement
range, 999.9 % is returned as a measurement error.
Before sending a query, change the measurement display selection to HCx which contains the
harmonic order need to be measured using DISP[:WIND]:MEAS:MODE. (See“DISPlay[:WINDow]:MEASure:MODE” on page 6-36.) If the measurement display of
harmonic current (HCx) does not contain the harmonic order, the measurement value will becomeindefinite.
Syntax:

MEASure[:SCALar]:CURRent:HARMonic:RATio?
<NR1>

Parameters:

1 (first to 10th), 2 (11th to 20th), 3 (21st to 30th), and 4 (31st to 40th)

Query example:

MEAS:CURR:HARM:RAT? 1

Response format:<NR2>

Response example:

100.0, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1

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6.3 Command Descriptions

 MEASure[:SCALar]:FREQuency?
This returns the external sync signal frequency in Hz units. The external sync signal frequency
measurement range is 38.0 Hz to 525.0 Hz. If the measured value exceeds the measurement range,
999.9 Hz is returned as a measurement error.
The frequency measurement can only be performed in external synchronization mode (AC-SYNC
or AC+DC-SYNC). ([3, “Invalid in this mode”] error occurs.)
Syntax:

MEASure[:SCALar]:FREQuency?

Parameters:

None

Query example:

MEAS:FREQ?

Response format:<NR2>

Response example:

50.4

 MEASure[:SCALar]:POWer:AC:APParent?
This returns the apparent power in VA units. The apparent power measurement full scale is 1400
VA. If the measured value exceeds the measurement range, 9999 VA is returned as a measurement
error.
Syntax:

MEASure[:SCALar]:POWer:AC:APParent?

Parameters:

None

Query example:

MEAS:POW:AC:APP?

Response format:<NR1>

Response example:

367

 MEASure[:SCALar]:POWer:AC:PFACtor?
This returns the output power factor. The power factor measurement range is 0.00 to 1.00. Whenthe measured value exceeds the measurement range, 9.99 is returned as a measurement error.
The power factor is calculated as “effective power/apparent power”.
Syntax:

MEASure[:SCALar]:POWer:AC:PFACtor?

Parameters:

None

Query example:

MEAS:POW:AC:PFAC?

Response format:<NR2>

Response example:

0.68

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6.3 Command Descriptions

 MEASure[:SCALar]:POWer:AC:REACtive?
This returns the reactive power in var units. The reactive power measurement full scale is 1400 var.
If the measured value exceeds the measurement range, 9999 var is returned as a measurement
error.
Syntax:

MEASure[:SCALar]:POWer:AC:REACtive?

Parameters:

None

Query example:

MEAS:POW:AC:REAC?

Response format:<NR1>

Response example:

269

 MEASure[:SCALar]:POWer:AC[:REAL]?
The effective power is returned in W units. The effective power measurement full scale is 1200 W.
If the measured value exceeds the measurement range, 9999 W is returned as a measurement error.
Syntax:

MEASure[:SCALar]:POWer:AC[:REAL]?

Parameters:

None

Query example:

MEAS:POW:AC?

Response format:<NR1>

Response example:

249

 MEASure[:SCALar]:VOLTage[:AC]?
This returns the output voltage RMS value (AC+DC RMS value) in Vrms units. For the 100 V
range, the output voltage RMS value measurement full scale is 250.0 Vrms, and for the 200 V
range, it is 500.0 Vrms. If the measured value exceeds the measurement range, 999.9 Vrms isreturned as a measurement error.
Syntax:

MEASure[:SCALar]:VOLTage[:AC]?

Parameters:

None

Query example:

MEAS:VOLT?

Response format:<NR2>

Response example:

100.4

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6.3 Command Descriptions

 MEASure[:SCALar]:VOLTage:HIGH?
This returns the maximum peak value (AC+DC peak value) of the output voltage in Vpk units. For
the 100 V range, the measurement full scale of the maximum peak value of output voltage is ±250
Vpk, and for the 200 V range, it is ±500 Vpk. If the measured value exceeds the measurement
range, 999 Vpk is returned as a measurement error.
Syntax:

MEASure[:SCALar]:VOLTage:HIGH?

Parameters:

None

Query example:

MEAS:VOLT:HIGH?

Response format:<NR1>

Response example:

100

 MEASure[:SCALar]:VOLTage:LOW?
This returns the minimum peak value (AC+DC peak value) of the output voltage in Vpk units. For
the 100 V range, the measurement full scale of the minimum peak value of output voltage is ±250
Vpk, and for the 200 V range, it is ±500 Vpk. If the measured value exceeds the measurement
range, −999 Vpk is returned as a measurement error.
Syntax:

MEASure[:SCALar]:VOLTage:LOW?

Parameters:

None

Query example:

MEAS:VOLT:LOW?

Response format:<NR1>

Response example:−99

 MEASure[:SCALar]:VOLTage:AVErage?
This returns the output voltage average value (AC+DC average value) in V units. For the 100 V
range, the measurement full scale of the average value of output voltage is ±250.0 V, and for the
200 V range, it is ±500.0 V. If the measured value exceeds the measurement range, 999.9 V is
returned as a measurement error.
Syntax:

MEASure[:SCALar]:VOLTage:AVErage?

Parameters:

None

Query example:

MEAS:VOLT:AVE?

Response format:<NR2>

Response example:

150.2

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EC750SA

6.3 Command Descriptionse) DISPlay subsystem

 DISPlay[:WINDow]:MEASure:MODE
This selects the measurement display selection. The measurement display selection setting is
RMS (RMS value), AVG (average DC), PEAK (peak value), and HC (harmonic current) 1 to 4.
The relation between the harmonic current mode and the harmonic degree is as follows.
HC1 ( 1st to 10th)
HC2 (11th to 20th)
HC3 (21st to 30th)
HC4 (31st to 40th)
However, when in AC-INT mode, if the frequency is neither 50 Hz nor 60 Hz, the harmonic
current cannot be measured. ([3, “Invalid in this mode”] or [6, “Invalid in this frequency”] error
occurs.)When the measurement display is set to HC1-HC4, commands except for
MEAS[:SCAL]:CURR:HARMonic[:AMPL]? (See“MEASure[:SCALar]:CURRent:HARMonic[:AMPLitude]?” on page 6-32.) or
MEAS[:SCAL]:CURR:HARM:RAT? (See“MEASure[:SCALar]:CURRent:HARMonic:RATio?” on page 6-32.) will not be accepted.
([4,"Under Busy State"] error will come out.)
Syntax:

DISPlay[:WINDow]:MEASure:MODE<CRD>

Parameters:

RMS/AVG/PEAK/HC1/HC2/HC3/HC4

Command example:

DISP:MEAS:MODE RMS

Query example:

DISP:MEAS:MODE?

Response format:<CRD>

Response example:

RMS

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EC750SA

6.3 Command Descriptionsf) STATus subsystem

 STATus:OPERation:CONDition?
This returns the operation condition register (OPCR). The response ranges from 0 to 20482.
Syntax:STATus:OPERation:CONDition?

Parameters:

None

Query example:

STAT:OPER:COND?

Response format:<NR1>

Response example:

16384

 STATus:OPERation:ENABle
This sets the operation event enable register (OPEE). The setting ranges from 0 to 20482.
Syntax:STATus:OPERation:ENABle<NR1>

Parameters:

0 to 20482

Command example:

STAT:OPER:ENAB 16384

Query example:

STAT:OPER:COND?

Response format:<NR1>

Response example:

16384

 STATus:OPERation[:EVENt]?
This returns the operation event register (OPER) value. The response ranges from 0 to 20482.
Syntax:STATus:OPERation[:EVENt]?

Parameters:

None

Query example:

STAT:OPER?

Response format:<NR1>

Response example:

16384

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6.3 Command Descriptions

 STATus:OPERation:NTRansition
STATus:OPERation:PTRansition
This sets the operation transition filter (OPTF). The setting ranges from 0 to 20482.
• When the NTR filter is set to 1, OPER is set to 1 when OPCR changes from 1 to 0.
• When the PTR filter is set to 1, OPER is set to 1 when OPCR changes from 0 to 1.
• When the NTR and PTR filters are both set to 1, OPER is set to 1 when OPCR changes.
• When the NTR and PTR filters are both set to 0, changes in OPCR are not propagated to OPER.
Syntax:STATus:OPERation:NTRansition<NR1>STATus:OPERation:PTRansition<NR1>

Parameters:

0 to 20482

Command example:

STAT:OPER:NTR 16384
STAT:OPER:PTR 0

Query example:

STAT:OPER:NTR?
STAT:OPER:PTR?

Response format:<NR1>

Response example:

16384 (when NTR is queried)
0 (when PTR is queried) STATus:WARNing:CONDition?
The warning condition register (WRCR) value is returned. The response ranges from 0 to 29947.
Syntax:STATus:WARNing:CONDition?

Parameters:

None

Query example:

STAT:WARN:COND?

Response format:<NR1>

Response example:

16384

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6.3 Command Descriptions

 STATus:WARNing:ENABle
This sets the warning event enable register. The setting ranges from 0 to 29947.
Syntax:STATus:WARNing:ENABle<NR1>

Parameters:

0 to 29947

Command example:

STAT:WARN:ENAB 1

Query example:

STAT:WARN:ENAB?

Response format:<NR1>

Response example:

1

 STATus:WARNing[:EVENt]?
This returns the warning event register value. The response ranges from 0 to 29947.
Syntax:STATus:WARNing[:EVENt]?

Parameters:

None

Query example:

STAT:WARN?

Response format:<NR1>

Response example:

0

 STATus:WARNing:NTRansition
STATus:WARNing:PTRansition
This sets the warning transition filter (WRTF). The setting ranges from 0 to 29947.
• When the NTR filter is set to 1, WRER is set to 1 when WRCR changes from 1 to 0.
• When the PTR filter is set to 1, WRER is set to 1 when WRCR changes from 0 to 1.
• When the NTR and PTR filters are set to 1, WRER is set to 1 when WRCR changes.
• When the NTR and PTR filters are set to 0, changes in WRCR are not propagated to WRER.
Syntax:STATus:WARNing:NTRansition<NR1>STATus:WARNing:PTRansition<NR1>

Parameters:

0 to 29947

Command example:

STAT:WARN:NTR 16384
STAT:WARN:PTR 0

Query example:

STAT:WARN:NTR?
STAT:WARN:PTR?

Response format:<NR1>

Response example:

16384
0

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EC750SA

6.3 Command Descriptionsg) OUTPut subsystem

 OUTPut[:STATe]This controls on/off settings of the output relay.
Syntax:

OUTPut[:STATe]
<bool>Parameters:

OFF|0 / ON|1

Command example:

OUTP ON

Query example:

OUTP?

Response format:<NR1>

Response example:1h) INPut subsystem

 INPut:GAIN
This sets the external input gain used in the external mode (AC-EXT or AC+DC-EXT) andinternal + external mode (AC-ADD or AC+DC-ADD). For the 100 V range, the external input
gain setting ranges from 0.0 to 220.0 and for the 200 V range, it ranges from 0.0 to 440.0.
When in AC-EXT, AC-ADD, AC+DC-EXT, or AC+DC-ADD mode, the output waveform setting
cannot be made. ([3, “Invalid in this mode”] error occurs.)
Syntax:INPut:GAIN<NR2>

Parameters:

0.0 to 220.0 (0.0 to 440.0)

Command example:

INP:GAIN 10.0

Query example:

INP:GAIN?

Response format:<NR2>

Response example:

10.0

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EC750SA

6.3 Command Descriptionsi) TRACe subsystem

 TRACe:CATalog?
This returns a list of defined waveform names. This command returns a list of all waveform namesthat can be selected by the user.
Syntax:TRACe:CATalog?

Parameters:

None

Query example:

TRAC:CAT?

Response format:<CRD>[, <CRD>]

Response example:

SIN, SQU, ARB1, ARB2, ARB3, ARB4, ARB5, ARB6, ARB7, ARB8,

ARB9, ARB10, ARB11, ARB12, ARB13, ARB14, ARB15, ARB16

 TRACe[:DATA]This sends or receives arbitrary waveforms. When a waveform name (ARB1 to ARB16) is
selected as the first parameter, the subsequent parameters are used to send 2 bytes × 4096 words (=8192 bytes) of waveform data in big endian order (one word of waveform data is sent in 2’scomplement format, higher byte first and then lower byte). As in the command example,
everything from the command to the data should be sent at one time.
However, the waveform data must be 4096 words.
The effective range for waveform data is −16384 to 16383. If a value of −16384 or lower is input,
it is recognized as −16384. If a value of 16383 or higher is input, it is recognized as 16383.
It can not be available for RS232 interface. (Use USB interface.)
Syntax:TRACe[:DATA]
<CRD>, <Binary Block Data>First parameter (waveform name)
Type

<CRD>

Range

ARB1 to ARB16

Second parameter and afterward (binary block data)
Configuration #48192<DAB><DAB><DAB><DAB>...
Command example:

TRAC ARB1, #48192<DAB><DAB><DAB><DAB>...

Query example:

TRAC? ARB1

Response format:<Binary Block Data>

Response example:#48192<DAB><DAB><DAB><DAB>...

6-41

EC750SA

6.3 Command Descriptions

 TRACe:DELete[:NAME]
This clears the specified arbitrary waveform memory. When this command is executed, a sine
wave is written to ARB1 to ARB8, a square wave is written to ARB9 to ARB12, and a triangle
wave is written to ARB13 to ARB16.
However, when output is on, the arbitrary waveform memory cannot be cleared. ([1, “Invalid with
output on”] error occurs.)
Syntax:TRACe:DELete[:NAME]
<CRD>

Parameters:

ARB1 to ARB16

Command example:

TRAC:DEL ARB1

Response format:

None

Response example:

Nonej) SYSTem subsystem

 SYSTem:BEEPer:STATe
This controls the beep on/off setting. When the beep sound is enabled, beeps accompanying cursor
operations become enabled, and an operation error or a protected operation will be notified with abeep.
Syntax:SYSTem:BEEPer:STATe<bool>Parameters:

OFF | 0 / ON | 1

Command example:

SYST:BEEP:STATe ON

Query example:

SYST:BEEP:STATe?

Response format:<NR1>

Response example:1

 SYSTem:CONFigure:EXTIOThis controls the external control input enable/disable setting.
Syntax:SYSTem:CONFigure:EXTIO
<bool>Parameters:

OFF | 0 / ON | 1

Command example:

SYST:CONF:EXTIO ON

Query example:

SYST:CONF:EXTIO?

Response format:<NR1>

Response example:

1

6-42

EC750SA

6.3 Command Descriptions

 SYSTem:ERRor?
This reads one error from the error queue (FIFO), and clears the read error in the error queue. The
maximum number of errors that can be held in the error queue is 20. If 21 or more errors occur,[−350, “Too Many Errors”] is inserted as the 20th error.
Syntax:SYSTem:ERRor?

Parameters:

None

Query example:

SYST:ERR?

Response format:<NR1>,<SRD>

Response example:

0, “No error”

 SYSTem:PON[:OUTPut]This sets the output status at power-on. When the output status is on at power-on, the output turns
on after the start-up and its display finishes.
However, if the system is restarted after a problem has been detected and the system has been
locked, it will be started with output off regardless of this setting.
Syntax:SYSTem:PON[:OUTPut]
<bool>Parameters:

OFF | 0 / ON | 1

Command example:

SYST:PON OFF

Query example:

SYST:PON?

Response format:<NR1>

Response example:0

 SYSTem:TUNit
This sets the sequence step execution time unit as s or ms.
Syntax:SYSTem:TUNit<NR1>

Parameters:

0 (s) / 1 (ms)Command example:

SYST:TUN 0

Query example:

SYST:TUN?

Response example:

0

6-43

EC750SA

6.3 Command Descriptions

 SYSTem:WRELease
This clears a warning. When a warning is cleared, the SET screen is displayed and key input isenabled. In order for the warning to be cleared, it is necessary that all the factors of the warning
have been removed and it is ready to be cleared.
If no warning has occurred, or if a warning has occurred but the device is not ready to cancel thewarning, [−200, “Execution error”] error occurs.
Syntax:SYSTem:WRELease<NR1>

Parameters:

1

Command example:

SYST:WREL 1

Response format:

None

Response example:

Nonek) PROGram subsystem

 PROGram[:SELected]:EXECute
This controls sequence operations. Control is performed using the STOP (stop), START (run),
HOLD (hold), BRANCH0 (branch 0), or BRANCH1 (branch 1) parameter.
When in AC-EXT, AC-ADD, AC-SYNC, AC+DC-EXT, AC+DC-ADD, or AC+DC-SYNC mode,sequences cannot be executed. ([3, “Invalid in this mode”] error occurs.)
When output is off, sequence execution is disabled. ([2, “Invalid with output off”] error occurs.)
Syntax:PROGram[:SELected]:EXECute<CRD>

Parameters:

STOP / START / HOLD / BRANCH0 / BRANCH1

Command example:

PROG:EXEC START

Response format:

None

Response example:

None

6-44

EC750SA

6.3 Command Descriptionsl) Common commands

 ∗CLSThis clears the following registers.
• Standard event register• Operation event register• Warning event register• Status byte
• Error queue
Syntax:∗CLS

Parameters:

None

Command example:∗CLS

Response format:

None

Response example:

None ∗ESE
This sets the standard event enable register. The setting ranges from 0 to 255.
Syntax:∗ ESE
<NR1>

Parameters:

0 to 255

Command example:∗ESE 255

Query example:*ESE?

Response format:<NR1>

Response example:

255

 ∗ESR?
This returns the standard event register value. When *ESR reads the standard event register, allbits in the event register are cleared to 0. The response ranges from 0 to 255.
Syntax:∗ ESR?

Parameters:

None

Query example:∗ESR?

Response format:<NR1>

Response example:

128

6-45

EC750SA

6.3 Command Descriptions

 ∗IDN?
This returns the model name, etc. The response message includes the “manufacturer, model name,serial number, and firmware version”.
Syntax:∗IDN?

Parameters:

None

Query example:∗IDN?

Response format:<SRD>

Response example:“NF Corporation, EC750SA, 000001, Ver1.00”

 ∗OPCWhen all operations※ have been completed, this sets the standard event register OPC bit (BIT0).
∗OPC? returns 1 when all operations have been completed. However, the standard event register
OPC bit is not cleared to zero when ∗OPC? is executed.
Syntax:∗ OPCParameters:

None

Command example:∗OPC

Query example:∗OPC?

Response format:<NR1>

Response example:1

 ∗RCL
This recalls status information stored to memory by ∗SAV. The selection range for the recall
memory is 1 to 30. However, recall is disabled when output is on. ([1, “Invalid with output on”]
error occurs.)
Syntax:∗ RCL
<NR1>

Parameters:

1 to 30

Command example:∗RCL 1

Response format:

None

Response example:

None

6-46

EC750SA

6.3 Command Descriptions

 ∗RST
This resets the device to its factory settings. However, reset cannot be executed when output is on.
([1, “Invalid with output on”] error occurs.)
Syntax:∗ RSTParameters:

None

Command example:∗RST

Response format:

None

Response example:

None ∗SAVThis stores the current status information in memory. The memory storage ranges from 1 to 30.
Syntax:∗ SAV
<NR1>

Parameters:

1 to 30

Command example:∗SAV 1

Response format:

None

Response example:

None ∗SRE
This sets the service request enable register. The setting ranges from 0 to 178.
Syntax:∗ SRE
<NR1>

Parameters:

0 to 178

Command example:∗SRE 178

Query example:∗SRE?

Response format:<NR1>

Response example:

178

 ∗STB?
This returns the status byte register value. The response ranges from 0 to 178.
Syntax:∗ STB?

Parameters:

None

Query example:∗STB?

Response format:<NR1>

Response example:

2

6-47

EC750SA

6.3 Command Descriptions

 ∗TST?
This returns the self test results. In this device, “0” is always returned.
Syntax:∗ TST?

Parameters:

None

Query example:∗TST?

Response format:<NR1>

Response example:0 ∗WAIThis is to prohibit the device from executing any subsequent command until all the operations (※)
are completed.
Syntax:∗WAI

Parameters:

None

Command example:∗WAI

Response format:

None

Response example:

None

※

“Operations” means execution process of any commands in the following.
• Output mode setting[SOURce:]MODE• Output range setting[SOURce:]VOLTage:RANGe• Output relay control

OUTPut[:STATe]• Sequence execution

PROGram[:SELected]:EXECute• Memory recall*RCL• Device reset

*RST

6-48

EC750SAAVErage

6-49

CONFigure

EXTIO

STATe

CONDition

LOW

RMS

BEEPerMODE

MEASure[WINDow]

DISPlay

HIGH

PEAK

LIMit

CURRent

ERRor

COUNt

OUTPutPON[EVENt]

CSTep

TUNit

NTRansition[IMMediate]

OPERation

SYSTemENABleCONDition

CLOCK

PHASe

WRELease[AC]

CONDition

STATus

EPARameter

PTRansition

DELeteSEQuence[AC][EVENt]

WARNing[DATA]

TRACe

STEP

HIGH

VOLTage

AVErage

ENABleCATalog

LEN

MODE[SOURce]

MAX

LOW

AC

AVErage

PTRansition

RESet

AMPLitude

NTRansition[NAME]

DELeteTPARameter

DC[LEVel]

HIGH

HIGH

APParent

RATio

HARMonic

GAIN

INPut

[AMPLitude][IMMediate][AMPLitude]

CREStfactor

CURRent[SCALar]

MEASureOFFsetADJustPFACtorLOW

AC

REACtive

RANGe

LOW

[REAL]

FREQuency

EXECute[SELected][STATe][IMMediate]

PROGram

POWer

LOW

OFFSet

HIGH

LIMit

OUTPutLIMit

VOLTage[IMMediate]

FREQuency[IMMediate][SHAPe]

FUNCtion

6.4 Command Tree

6.4 Command Tree
The command tree for each of the EC750SA subsystem is shown in Figure 6-3.

Figure 6-3. Command Tree

EC750SA

6.5 Status System

6.5 Status System
The EC750SA includes the minimum set of status groups defined by IEEE488.2. The EC750SA status
system is outlined below in Figure 6-4.

Not used (always 0)
Warning status summary
Not used (always 0)
Not used (always 0)
Message queue summary
Standard event status summary
Operation status summary

RQS
DI07
OPR
DI08

Servicerequestgeneration

6

ESB
DI06

MAV
DI05

3
DI04

2
DI03

WAR
DI02

MSS
DI07

0
DI01

Status byte register

Read by *STB?
common query

Logical OR

&

&
&

&

7

5

4

1

Service request enableregister*SRE common command*SRE? common query

Figure 6-4. Status System

6-50

EC750SA

6.5 Status System

6.5.1 Status byte
The status byte register definitions are listed in Table6-14. Bits in the status byte register become valid
when 1 is set in the service request enable register, then the ORed result of the valid bits is taken to issue
a service request.
A status byte can be read by the serial poll or an ∗STB? query.
Table6-14. Status Byte Register Definitions
Bit

WeightOPR (7)128

RQS/MSS(6)64

ESB (5)32

MAV (4)16

Description
Operation status summary
During the serial poll, this bit is defined as the RQS (Request Service) whichindicates whether a service request has been issued to the controller by a device.
This bit is cleared to zero when the serial poll is used.
When using an ∗STB? query, this bit is defined as the MSS (Master Status
Summary), and operates as the status byte summary bit. MSS is not cleared until
there are no more enabling factors.
The ESB (Event Status Bit) operates as the standard event status register summary
bit. This bit is set (= 1) when any valid bit in the standard event status register is set(= 1), and is cleared to zero when all bits in that register are 0.
The MAV (Message Available Bit) is set (= 1) when a response to a query is written
to the corresponding response message queue and prepared for output.
This bit is cleared to zero when the response message queue becomes empty.

3

8

Always 0 (not used)

2

4

Always 0 (not used)

WAR (1)

2

Warning status summary

01

Always 0 (not used)a) Checking status when a query is issued
Once a query command has been issued, the answer to the query will be correctly received byreceiving the response message by ordinary. There is no particular need to check the MAV bit in thestatus byte. To continue processing while checking the MAV bit, once the query command has beensent, confirm that the MAV bit = 1 in the status byte by serial poll, then read the response message andconfirm that the MAV bit has been cleared to zero before proceeding to the next operation.

6-51

EC750SA

6.5 Status System

6.5.2 Standard event status
The structure of the standard event status register is shown in Figure 6-5 below.

ESR (standard event register)Power on (PON)

7

7

User request (URQ)66Command error (CME)55

Execution error (EXE)44

Device specific error (DDE)33

Query error (QYE)

2

2

Request control (RQC)

1

1

Operation complete (OPC)00

Logical OR

ESE (standard event enable register)Standard event status summary
Status byte (bit 5)

Figure 6-5. Standard Event Status Register
The definition of the standard event status register is listed in Table6-15. Bits in the standard event status
register become valid when 1 is set to the standard event status enable register, and the ORed result of thevalid bits is reflected in the ESB bit of the status bit register.
The standard event status register can be read by an ∗ESR? query.
All of the bits are cleared when they are read by an *ESR? query, when a *CLS command is executed, orwhen the power is turned on again (except that the PON bit is set to 1 when the power is turned on again).

6-52

EC750SA

6.5 Status System

Table6-15. Standard Event Status Register Definitions
Bit

WeightDescription
Power on bit

PON (7)128

URQ (6)64

CME (5)32

1 is set to this bit when the power is turned on.
When this register is read, this bit is cleared to 0, and it remains 0 until the power isturned on again.
User request bit
Always 0 (not used)
Command error
1 is set to this bit when a syntax error occurs in the program code.
Execution error

EXE (4)16

DDE (3)8

1 is set to this bit when a parameter is out of the setting range or when settings
conflict.
Device definition error
Always 0 (not used)
Query error

QYE (2)4

1 is set to this bit when there is no data in the buffer containing response messages
when trying to read that buffer, or when the data in the buffer containing response
messages has been lost.
Request control
Always 0 (not used)

RQC (1)2

1 is set to this bit when all processing of operation complete (OPC) commands has
been completed.
∗In this device, this bit is always 0.
Operation complete

OPC (0)1

1 is set to this bit when all processing of operation complete (OPC) commands has
been completed.

6-53

EC750SA

6.5 Status System

6.5.3 Operation status
The structure of the operation status register is shown in Figure 6-6 below.
OPCR (operation condition register)

Always 0

15

15

15

15

Under sequence execution

14

14

14

14

Not used

13

13

13

13

Under sequence hold

12

12

12

12

Not used

11

11

11

11

Not used

10

10

10

10

Not used

9

9

9

9

Not used

8

8

8

8

Not used

7

7

7

7

Not used

6

6

6

6

Not used

5

5

5

5

Not used

4

4

4

4

Not used

3

3

3

3

Not used

2

2

2

2

BUSY

1

1

1

1

Not used

0

0

0

0

Logical OR

OPTF (operation transition filter)

OPER (operation event register)
OPEE (operation event enable register)

Operation status summary
Status byte (bit 7)

Figure 6-6. Operation Status
The transition filters convert conditions to events.
The transition filters include an NTRansition filter and a PTRansition filter. The settings and operations ofthese filters are described below.
• When the NTR filter is set to 1, OPER is set to 1 when OPCR changes from 1 to 0.
• When the PTR filter is set to 1, OPER is set to 1 when OPCR changes from 0 to 1.
• When the NTR and PTR filters are both set to 1, OPER is set to 1 when OPCR changes.
• When the NTR and PTR filters are both set to 0, changes in OPCR are not propagated to OPER.

6-54

EC750SA

6.5 Status System

6.5.4 Warning status
The structure of the warning status register is shown in Figure 6-7 below.
WRCR (warning condition register)

Always 0

15

15

15

15

Peak current limiter operation

14

14

14

14

RMS current limiter operation

13

13

13

13

Power limiter operation

12

12

12

12

Not used

11

11

11

11

External synchronization signal unlock

10

10

10

10

Not used

9

9

9

9

Not used
External synchronization
frequency range protection
Overheating protection

8

8

8

8

7

7

7

7

6

6

6

6

DC undervoltage protection

5

5

5

5

DC overvoltage protection

4

4

4

4

Output peak current protection

3

3

3

3

Not used

2

2

2

2

Output RMS current protection

1

1

1

1

Output voltage protection

0

0

0

0

Logical OR

WRTF (warning transition filter)

WRER (warning event register)
WREE (warning event enable register)Warning status summary
Status byte (bit 1)

Figure 6-7. Warning Status

6-55

EC750SA

6.6 Error Message List

6.6 Error Message List
Error messages are listed in Table6-16 below.
Table6-16. Error Message List
No.
0

Message“No error”

Cause
No error.

−100 “Command error”

Command was recognized as invalid due to any cause.

−102 “Syntax error”

Command was recognized as invalid due to reception of
undefined command or parameter.

−200 “Execution error”

Error occurred when executing the command due to any cause.
(General execution error)−222 “Data out of range”

Error occurred when executing the command due to out of range
parameter.

−350 “Too Many Errors”

New errors cannot be retained due to error queue overflow.

(General command error)

1“Invalid with output on”

Error occurred when executing the command because the output
relay was on.

2“Invalid with output off”

Error occurred when executing the command because the output
relay was off.

3

“Invalid in this mode”

Error occurred when executing the command due to inappropriate
output mode.

4“Under Busy State”

Error occurred during execution of command due to busy device.

5“Out of Limiter”

Error occurred during execution of command because limiter
value was exceeded.

6“Invalid in this frequency”

Error occurred when executing the command due to inappropriate
oscillation frequency setting.

7“Out of Input Signal
frequency”

Error occurred when executing the command due to out of theexternal synchronization frequency range.

8“Under Warning State”

Error occurred when executing the command because device wasoperating in protected mode.

6-56

EC750SA

6.7 Programming example

6.7 Programming example
Refer to "Remote Control Programming Example" included in the attached CD-ROM.

6.8 Programming Precautionsa) Arbitrary waveform data
Arbitrary waveform data comprises a block of binary data. The preceding ASCII program message
command field and the binary data block arbitrary waveform data should be transferred at the sametime. Always transfer arbitrary waveform data in 4096-word (8192-byte) batches. If the data count isinsufficient, an error may occur, in which case the correct waveforms cannot be output.
b) Caution concerning commands issued via the USB interface
When transferring commands, LF (0AH) must be appended at the end of the transmitted message
string as the program message terminator. If a command is sent without appending this LF, operation
will be incorrect.

6.9 Notes on Remote Control
If you are using USB interface and your PC environment is as follows, be sure to exit the program before
turning off this product. Otherwise, the program will be forced to shut down and some processes willremain on OS because the VISA driver software cannot detect that power of this product is surely off.
OS:

Windows VISTA

VISA driver software:

NI-VISA

6-57

EC750SA

6.9 Notes on Remote Control

6-58

EC750SA7. TROUBLESHOOTING

7.1

Protection Function .......................................................... 7-2

7.2

Error Messages and Error Handling ................................ 7-4

7.2.1 Error at power-on ...................................................... 7-5
7.2.2 Protection function-related errors .............................. 7-6
7.2.3 Panel operation errors ............................................... 7-7
7.2.4 Warning messages .................................................... 7-9
7.2.5 Remote-related external control errors ..................... 7-11
7.3

When Failure Is Suspected ............................................ 7-12

7-1

EC750SA

7.1 Protection Function

7.1 Protection Function
The EC750SA is equipped with a protection function that monitors the internal status and displays anerror or warning when it detects the following types of abnormalities.
If the beep sound has been set to on, a beep will accompany the displayed error or warning. (A beepsounds whenever a protection function-related error occurs, regardless of the beep sound setting.)a) Abnormal output
When output overvoltage or output overcurrent is detected, output will be set to off and the error
message will be displayed.
b) Abnormal power source block
When an internal power source abnormality is detected, output will be set to off and the error or
warning message will be displayed. If it is an error that occurred, all operations will become disabled
except for the power shutdown operation.
c) Abnormal internal control
When an internal control abnormality is detected, output will be set to off and the error or warning
message will be displayed. If it is an error that occurred, all operations will become disabled except forthe power shutdown operation.
d) Abnormal internal temperature
When an internal temperature abnormality is detected, the warning message will be displayed and theoutput will be set to off.
See “7.2.2 Protection function-related errors”, for description of error messages.
See “7.2.4 Warning messages”, for description of warning messages.
See “5.6.2 Beep sound”, for description of the beep sound.
The EC750SA checks an error listed in Table7-1 sequentially from the top and displays only the error
message detected first.

7-2

EC750SA

7.1 Protection Function

Table7-1. Protection Function
Action When Detected
Protection
Internal
communication error
1

Output off

Internal communication error message 1√√

Internal
communication error
2√√Control panel error√√

AMP no response
error

Displayed Message

SystemLock

See “7.2.2 Protection function-related
errors”.
Internal communication error message 2
See “7.2.2 Protection function-related errors”.
Control panel error message
See “7.2.2 Protection function-related errors”.
AMP no response error message√√

See “7.2.2 Protection function-related
errors”.
Fan failure error message

Fan failure error√√

Output overvoltage
error

√

Output overvoltage error message

Output RMS current
error

√

Output RMS current error message

Output peak current
error

√

Output peak current error message

DC overvoltage error√

DC overvoltage error message

DC undervoltage
error

√

Abnormal internal
temperature√

Internal temperature warning message

External sync signal
frequency range error√

External sync signal frequency range warning message

See “7.2.2 Protection function-related
errors”.
See “7.2.4 Warning messages”.
See “7.2.4 Warning messages”.
See “7.2.4 Warning messages”.
See “7.2.4 Warning messages”.

∆

Note

DC undervoltage error message
See “7.2.4 Warning messages”.
See “7.2.4 Warning messages”.
See “7.2.4 Warning messages”.

Note System lock may occur.

7-3

EC750SA

7.2 Error Messages and Error Handling

7.2 Error Messages and Error Handling
The EC750SA performs a self test at power-on, and displays an error message if any abnormalities aredetected. An error message is also displayed when a setting or operation is performed incorrectly or whenan abnormality is detected in output or internally.
The contents of these error messages, their causes, and the required handlings are described below.

7-4EC750SA

7.2 Error Messages and Error Handling

7.2.1 Error at power-on
The EC750SA performs the following fault checks at power-on.
If an error occurs, NG is displayed on the system check screen. Nothing is displayed when all check items
are OK.

ROM CHECK.....................OKRAM READ/WRITE CHECK..........OKBACKUP MEMORY CHECK...........OKWAVE MEMORY CHECK.............OKSEQUENCE MEMORY CHECK.........OKCALIBRATION MEMORY CHECK......NG .... INITIALIZEDVERSION CHECK.................NG .... INITIALIZED

Figure 7-1. Screen Display When Self Fault Check Errors Have Occurred
Table7-2 lists check items and processing when a fault is detected.
Table7-2. Self Fault Check Messages
Message

Fault Check ItemROM CHECKROM sum check

RAM READ/WRITECHECK

RAM read/write check

BACKUP MEMORYCHECKWAVE MEMORYCHECKSEQUENCE
MEMORY CHECK

Cause and Operation or Action Required
When Fault Is Detected
Message is displayed and the system will not start.
The cause may be a faulty component. Contact NF
Corporation or our agent.

Backup memory sum check Target memory is initialized, then the system isstarted.
(See “3.2 Display and Initial Settings at
Waveform memory sum
Power-on”.)
check
If this occurs frequently, it may be due todeterioration of the backup battery.
Sequence memory sum
See “8.5 Backup Battery”.)(
check

CALIBRATIONMEMORY CHECK

Calibration data check

VERSION CHECK

Version number check

The calibration value memory is initialized, thenthe system is started.
In this case, the EC750SA is started without
calibrated values, so it may not provide theexpected performance. Also, this may be due to afaulty component. Contact NF Corporation or our
agent.
Backup memory, sequence memory, andwaveform memory are initialized, then the systemis started.

7-5

EC750SA

7.2 Error Messages and Error Handling

7.2.2 Protection function-related errors
When a protection function-related error has occurred, an error message is displayed in the message
window, and operation is stopped.

Figure 7-2. Screen Display When Protection Function-Related Error Has Occurred
When a protection function-related error message is displayed, turn off the power switch. (See “7.1

Protection Function”.)
Table7-3 lists error messages and actions when errors are detected.
Table7-3. Protection Function-Related Errors
Error Message
System Locked.
caused by:
COMMUNICATION FAILURE 1
System Locked.
caused by:
COMMUNICATION FAILURE 2
System Locked.
caused by:
FRONT PANEL FAILURE
System Locked.
caused by:
AMP NO RESPONSE ERROR
System Locked.
caused by:
FAN FAILURE ERROR

Protection Item
Internal
communication
error 1
Internal
communication
error 2Control panelerror
AMP no response
error

Cause and Operation or Action Required
When Fault Is Detected

Output is set to off and system lock status isset. Turn off the power switch.
If the same protection error occurs again after
the power is turned back on, contact NF
Corporation or our agent.

Fan failure error

7-6EC750SA

7.2 Error Messages and Error Handling

7.2.3 Panel operation errors
Panel operation error messages are displayed in the status window. The message box closes automaticallyafter 1.5 seconds.

Message box

Figure 7-3. Screen Display When Panel Operation Error Has Occurred
Table7-4. Panel Operation Errors (1/2)
Error Message
INVALID IN THISFREQUENCYOUT OF INPUT SIGNALFREQUENCYOUT OF RANGE

Cause and Action Required
Frequency setting is not valid, so setting (execution) is disabled. Set
50 Hz or 60 Hz.
(

External sync signal frequency is outside of sync enabled range.
See “4.7 Synchronize the Output with External(
Signal”.)
Remote control parameter range check error. Set the parameter within
the possible range of settings. (Remote mode only)(

INVALID WITH OUTPUT ON
INVALID WITH OUTPUT OFF

INVALID IN THIS MODE

See “3.4.6 Setting output frequency”.)

See “6.3.2 Detailed command descriptions”.)

Setting (execution) is invalid while output is on. Turn output off.
(

See “3.4.8 Output on/off”.)

Setting (execution) is invalid while output is off. Turn output on.
(

See “3.4.8 Output on/off”.)

Cannot set (execute) due to invalid output mode. Change the output
mode.
(

See “3.4.2 Setting output mode”.)

7-7

EC750SA

7.2 Error Messages and Error Handling

Table7-5. Panel Operation Errors (2/2)
Error Message
UNDER BUSY STATE

Cause and Action Required
Cannot set (execute) due to BUSY status. Wait until the BUSY display
disappears, then try operation again.
(

UNDER REMOTE STATEUNDER LOCAL STATEUNDER KEYLOCKOUT OF LIMITER

Cannot set (execute) due to remote status. Set local mode.
(

See “5.5.3 Remote”.)

Cannot set (execute) due to local mode. (Remote mode only)(

See “6 REMOTE INTERFACE”.)

Cannot set (execute) due to keylock status. Cancel keylock.
(See “5.6.1 Keylock”.)

Cannot set (execute) because range limit is exceeded. (Remote mode
only)(

COMMAND ERROR

See “3.4.3 Setting output voltage range”.)

See “6 REMOTE INTERFACE”.)

This is the USB interface command error. Check the command.
(Remote mode only)(

See “6.6 Error Message List”.)

UNDER LOCAL LOCK OUT

Setting to local is prohibited under local lockout state.

EXECUTION ERROR

Execution errors other than the above.

7-8

EC750SA

7.2 Error Messages and Error Handling

7.2.4 Warning messages
When output is turned off due to an output error, internal temperature error, or external sync signal
frequency out of range error, a warning is displayed in the message window. (See “7.1 Protection

Function”.)

Figure 7-4. Screen Display When Warning Has Occurred
Until the warning has been canceled for the device, all key operations and command operations are notaccepted.
When the warning is canceled for the device, “Press ENTER key” is displayed on the warning screen. To
close the warning screen, press the ENTER key or CANCEL key. If the “Press ENTER key.” message is
not shown within 10 seconds, turn off the power and turn it on again.
Table7-6 and Table7-7 describe these warning messages.
Table7-6. Warning Messages (1/2)
Message
Output OFF.
caused by:
OUTPUT OVERVOLTAGE
Output OFF.
caused by:
OUTPUT OVERCURRENT[RMS]

Cause and Action Required
Output off due to the output overvoltage error function.
Press the ENTER key or CANCEL key. The error is cleared
and the system becomes available. Check settings and loadconditions before using.
Output off due to the output RMS current error function.
Press the ENTER key or CANCEL key. The error is cleared
and the system becomes available. Check settings and loadconditions before using.

7-9

EC750SA

7.2 Error Messages and Error Handling

Table7-7. Warning Messages (2/2)
Message
Output OFF.
caused by:
OUTPUT OVERCURRENT[PEAK]
Output OFF.
caused by:
DCPS OVERVOLTAGE

Output OFF.
caused by:
DCPS UNDERVOLTAGE

Output OFF.
caused by:
OVERHEATOUTPUT OFF
caused by:
OUT OF SYNC FREQUENCY

Cause and Action Required
Output off due to the output peak current error function.
Press the ENTER key or CANCEL key. The error is cleared
and the system becomes available. Check settings and loadconditions before using.
Output off due to the DC power source block overvoltage
error function.
Press the ENTER key or CANCEL key. The error is cleared
and the system becomes available. Check settings and loadconditions before using.
Output off due to the DC power source block undervoltage
error function. Press the ENTER key or CANCEL key. The
error is cleared and the system becomes available. Checksettings and load conditions before using.
The device may enter the error status and the system may belocked. In such a case, turn the power off. If a protection error
is repeatedly detected after power-on, contact the NF
Corporation or our agent.
Output off due to the internal temperature error protection
function.
Press the ENTER key or CANCEL key. The error is cleared
and the system becomes available. Check the ambient
temperature and other installation conditions before using.
Output off due to the external sync signal frequency out ofrange function.
Press the ENTER key or CANCEL key. The error is cleared
and the system becomes available. Check the external sync
signal source before using.

7-10

EC750SA

7.2 Error Messages and Error Handling

7.2.5 Remote-related external control errors
Table7-8 lists remote-related external control error messages.
Table7-8. Remote Error Message List
No.
0

Message Text
“No error”

Cause
No error.

−100 “Command error”

Command was recognized as invalid due to any cause.

−102 “Syntax error”

Command was recognized as invalid due to reception of
undefined command or parameter.

−200 “Execution error”

Error occurred when executing the command due to any cause.
(General execution error)−222 “Data out of range”

Error occurred when executing the command due to out of range
parameter.

−350 “Too Many Errors”

New errors cannot be retained due to error queue overflow.

(General command error)

1“Invalid with output on”

Error occurred when executing the command because the output
relay was on.

2“Invalid with output off”

Error occurred when executing the command because the output
relay was off.

3

“Invalid in this mode”

Error occurred when executing the command due to inappropriate
operation mode.

4“Under Busy State”

Error occurred during execution of the command, because thedevice is busy state.

5“Out of Limiter”

Error occurred during execution of the command because limiter
value was exceeded.

6“Invalid in this frequency”

Error occurred when executing the command due to inappropriate
oscillation frequency setting.

7“Out of Input Signal
frequency”

Error occurred when executing the command due to out of theexternal synchronization frequency range.

8“Under Warning State”

Error occurred when executing the command because device wasoperating in protected mode.

7-11

EC750SA

7.3 When Failure Is Suspected

7.3 When Failure Is Suspected
If a problem that might be due to a fault occurs when using the EC750SA, check the following table todetermine whether the problem might be due to an operation, use method, connection error, etc.
If the problem is not covered by this table, leave the power off and contact NF Corporation or our agent.
Table7-9. When Failure Is Suspected (Problem when Switching Power on/off)Symptom

Possible Cause

Required Action, etc.

Make sure the power cord is firmly inserted into
Not connected to a commercial
the outlet and the inlet (on rear panel of theDoes not operate after power source.
EC750SA).
turning on power
Use a power source that is within the rated range.
Power source being used isswitch.
outside the rated range.
Does not stop
immediately after
turning off powerswitch.

Internal fuse is broken.

Contact NF Corporation or our agent.

This is not a failure.

Please wait. It will stop in approximately fiveseconds.
Increase the LCD contrast setting.

LCD is blank.
(Fan is operating.)

LCD has low contrast setting.

To adjust the LCD contrast when the screen
contents cannot be seen, press the ENTER key
and CANCEL key at the same time. This sets thedigit cursor to the 10’s column.
See “5.6.3 LCD contrast
adjustment”.

Table7-10. When Failure Is Suspected (Problem During Key Operation)
Symptom

Possible Cause

Required Action, etc.

Keylock has been set to on.
Panel operation does
not work.

Turn off the keylock.
See “5.6.1 Keylock”.

Key or MODIFY dial has been
degraded.

Contact NF Corporation or our agent for repairs.

7-12

EC750SA

7.3 When Failure Is Suspected

Table7-11. When Failure Is Suspected (Problem Related to Output Voltage or Output
Voltage Range Setting)
Symptom

Possible Cause

Required Action, etc.
Output voltage cannot be set when the signal
source mode is external signal input (EXT).

Cannot set output
voltage.

External signal input mode has
been set.

Set the signal source mode to internal (INT) orinternal + external (ADD) mode.
See “3.4.2 Setting output mode”.
See “5.3.1 Output mode setting”.

Unnecessary items have been
Check the settings again.
set (for example, AC has been When using ADD mode, check both the external
set even though only DC output signal and external input gain.
will be used).
See “4.10 Adding External Signals
and Internal Signals”.
Set value differs frommeasured value.

Also, check the selected measurement display
items.
See “5.5.6 Selection of
measurement display (MEASURE)”.
A low impedance load is being
driven.

With a low resistance load, inductance load, or
capacitive load, the measured value may be lessthan the value set for the limiter operation.

Table7-12. When Failure Is Suspected (Problem Related to Frequency Setting)
Symptom

Output frequency
cannot be set.

Possible Cause

Required Action, etc.

Output frequency cannot be set when the signal
source mode is external signal input (EXT) or
External signal input or external external synchronization (SYNC).
synchronization mode has been Set the signal source mode to internal (INT) orinternal + external (ADD) mode.
set.
See “3.4.2 Setting output mode”.
See “5.3.1 Output mode setting”.

Line synchronization
cannot be set.

Set the signal source mode to external
synchronization (SYNC), then set the external
External synchronization mode sync signal source to LINE.
See “3.4.2 Setting output mode”.
has been set.
See “4.7.2 Line synchronization”.
See “5.3.1 Output mode setting”.

7-13

EC750SA

7.3 When Failure Is Suspected

Table7-13. When Failure Is Suspected (Problem Related to Output Error)
Symptom

Possible Cause

Required Action, etc.

Output voltage setting is “0”.
Signal source is not connected.

External input gain is set to “0”.

Check the output voltage setting.
See “3.4.5 Setting output voltage”.
When the signal source mode is external signal(EXT), connect the signal source to the externalsignal input terminal, then set a suitable external
input gain.
See “3.3.5 External signal
input/external sync signal input
terminal”.
See “4.9 Amplification of External
Signal”.

No output

Output on/off switch(OUTPUT) is not set to on.

Set the output on/off switch to on.
Output cannot be set to on when a protection
function-related error or warning message isbeing displayed.

See the required actions listed in“Table7-3. Protection Function-Related
Protection function-related error
Errors” and“Table7-6. Warningor warning message is
Messages”, and eliminate the cause of thedisplayed.
error.
When a protection function-related error
message is being displayed, all key operations
become invalid. Turn the power source switchoff, then turn on again.
Connect a load that is within the maximum
output range or lower the output level.

Overload has occurred.

If the signal source is EXT or ADD, either
Excessive signal level in signal
reduce the connected signal generator output
generator
level or reduce the external input gain.
Warning message isdisplayed.

Ambient temperature is too
high.

Keep the ambient temperature lower than 40°C
during use.

Air filter is clogged.

See “8.2 Routine Maintenance” andclean the air filter.

Something is blocking the air
Make sure the EC750SA complies with theflow near the air intake on the
installation requirements described in“2.2
front panel or the air exhaust on
Installation Environment”.
the rear panel.

7-14

EC750SA

7.3 When Failure Is Suspected

Table7-14. When Failure Is Suspected (Problem Related to Measurement Functions)
Symptom
Measured value forvoltage or current is
not displayedcorrectly.

Possible Cause

Required Action, etc.

Selected display items are notappropriate.

For AC, select RMS. Displayed values will not
be correct unless RMS is selected.

“− − − −” is displayed.

Measurement is out of range.
(Out of measurable range)

Measured values areinconsistent.

Measurements are being taken
in external mode (EXT).

Measurements are at low
frequency (10 Hz or less).

“− − − −” is displayed when any of themeasurement ranges set as described in“5.4 MEASURE Screen” have been
exceeded. Check the load conditions and set
values.
When in external mode (EXT), the measurement
cycle is fixed.
If the external input signal frequency is known,change the output mode to ADD mode
(AC-ADD or AC+DC-ADD), set the internal
oscillator output voltage to “0”, and set thefrequency as the external input frequency.
When the frequency is lower than 10 Hz, themeasurement cycle is fixed, so the measured
values may become unstable.

Table7-15. When Failure Is Suspected (Problem Related to Sequence Function)
Symptom
Sequence control does
not work.
When a sequence iscompleted, the setting
differs from the final
step.

Possible Cause

Required Action, etc.

Output is off.

Set output to on.

Setting range limit was not checked when
When completed, the voltage or
programming the sequence.
frequency is outside the setting
When the final step value is outside the setting
range limit.
range limit, it is forcibly changed.

Table7-16. When Failure Is Suspected (Problem Related to Memory Function)
Symptom
Memory recall does
not work.

Possible Cause
Output on/off switch(OUTPUT) is set to on.

Required Action, etc.
When output is on, recall cannot operate.
Set the output on/off switch to OFF.

7-15

EC750SA

7.3 When Failure Is Suspected

Table7-17. When Failure Is Suspected (Problem Related to Limiter Setting Range Limit)
Symptom

Possible Cause

Required Action, etc.

Peak current value that
Peak current limiter may overshoot, depending
exceeds the setting
Overshoot current value is being
on the load.
value of the peakmeasured.
See “3.4.7 Using limiter functions”.
current limiter is held.

Table7-18. When Failure Is Suspected (Other Problems)
Symptom
Possible Cause
Required Action, etc.
The current
In the AC mode, the control function works towaveform iseliminate the offset voltage (DC component).
abnormal (e.g.,
The output offset voltage (DC When the product is used in the AC+DC
asymmetrical ormode, switch it to the AC mode.
component) caused the load
excessive) when thetransformer core to reach the
See “3.4.2 Setting output mode”
transformer ismagnetic saturation.
If it does not bring much improvement, adjust
connected as the load
the DC offset.
and the AC voltage is
See “5.5.9 Adjusting DC offset”
output.
Output overvoltage
Back EMF was generated by theoccurs when load is
Lower the peak current limiter settings (bothoperation of the peak current
inductive.(transformer
positive and negative).
limiter.
, etc.)
Try restarting several times. If the battery icon
still blinks, the battery needs to be replaced.
Contact NF Corporation or our agent.
Battery consumption
Unconformity occurred in the
If the battery icon never blinks after restarting
icon blinks when turninternal memory.
just once, the battery has not dried out yet.
on the power.
However, the settings may have been reset to thefactory defaults. Check the settings before using
again.

7-16

EC750SA8. MAINTENANCE

8.1 Introduction ........................................................................ 8-2
8.2 Routine Maintenance ......................................................... 8-2
8.3 Storage, Repackaging, and Transportation ........................ 8-4
8.4 Checking the Version Number ........................................... 8-5
8.5 Backup Battery .................................................................. 8-7

8-1

EC750SA

8.1 Introduction

8.1 Introduction
This chapter describes the following items.
• Caution points and storage methods for long periods of non-use• Caution points for transport and when repackaging for transport
See “2.4 Simple Operation Checks”, for description of simple operation checks.
If the product does not pass the operation checks, request calibration and/or repair to NF Corporation or
our agent.

8.2 Routine MaintenanceBe sure to install the EC750SA in a location that meets the installation requirements.
See “2.2 Installation Environment”, for description of the installation requirements.
a) When panel or case is dirty
Wipe clean with a soft cloth. For stubborn dirt, use a cloth that has been dipped in neutral detergent andthen firmly wrung out.
Do not use a cloth treated with a volatile solvent, such as paint thinner or benzene, or a chemicallytreated cloth, which may cause discoloration or peeling of paint.

8-2

EC750SA

8.2 Routine Maintenanceb) When fan filters are dirty
A front panel is provided with air filters for removing dust or dirt from the intake air.
When too much dirt accumulates in the filters, it can clog them and reduce air flow, causing higher
internal temperatures which can reduce reliability. Periodically check the condition of the air filters.
The air filters should be cleaned about once a month, or whenever fine dust has accumulated in thefilter.
To clear the air filters, rinse (with water, etc.) then dry them well. They should be completely dry whenreinstalled.

(1) Press the back of the left side of the air inlet
to the right and pull it.
(2) The left side will be unhooked. Hold the left
side and pull the inlet to the left forward torelease it from the unit.

(3) Take out the inside air filter from the backside of the inlet and clean it.
(4) Perform steps (1) to (3) above to remove andclean the other air filter.
(5) After the air filters are completely dry,
perform steps (1) to (3) in reverse order toattach the air inlet covers.

Figure 8-1. Air Filter Cleaning Steps
The air filter will not function adequately if it becomes clogged, such as with very fine dust. To prevent
this, do not install this device in a location where there is a lot of dust (or fine dirt, etc.). Also avoid humid
locations where condensation occurs easily.

8-3EC750SA

8.3 Storage, Repackaging, and Transportation

8.3 Storage, Repackaging, and Transportation
Store the EC750SA in a location that meets the installation requirements.
See “2.2 Installation Environment”, for description of installation requirements.
a) Storage when unused for a long time
• Remove the power cord from the outlet and the product.
• Store the product on a shelf or rack where it will be protected from falling objects and dust.
If it may be covered with dust, put the cover, such as cloth and polyethylene sheet, on it.
• The minimum storage environment requirements are a temperature range of −10°C to +50°C, with
5% to 95% RH, but it is also important to avoid locations subject to abrupt temperature changes
and/or exposure to direct sunlight. If possible, choose a storage environment that has a steadyambient temperature.
See “9.16 Ambient Temperature Range, Ambient Humidity Range, Etc.”, fordetailed storage conditions.
b) Repackaging and transportation
Note the following caution points when repacking the main unit for transport, repair, or for some otherreason.
• Wrap the main unit in a polyethylene bag or sheet.
• Use a cardboard box that is strong enough to support the main unit weight and large enough for its
size.
• Pack with shock-absorbent material on all six sides of the main unit.
• Inform the transport company that this product is a precision equipment.
• Be sure to include the instruction manual at transportation.

8-4

EC750SA

8.4 Checking the Version Number

8.4 Checking the Version Number
The EC750SA firmware version is displayed in the bottom right of the screen for a few seconds after
power-on.
At other times, the version information can be checked via the control panel system information screen, as
described below.

 Operation steps
Select the SYSTEM menu from the MISC menu

1. Press theor

CANCEL, then select “INFORMATION”.

key to move the cursor to the

icon.

ENTER

Cursor

2. Press the

ENTER

Press thekey to move the cursor to “SYSTEM” .

CANCEL3. Press the

key to display the MISC menu.

ENTER

CANCELENTER

key to display the SYSTEM screen .

ENTER

8-5

EC750SA

8.4 Checking the Version Number

4. Press the

key to move the cursor to “INFORMATION”.

CANCEL5. Press the

ENTER

ENTER

key to display the “SYSTEM INFORMATION” screen.

CANCEL

ENTER

Figure 8-2. SYSTEM INFORMATION Screen
6. Press the TOP MENU key to return to the SET menu screen.
TOP
MENU

START

SEQUENCE
STOP

HOLD

LOCAL

8-6

EC750SA

8.5 Backup Battery

8.5 Backup Battery
The contents of memory (See “4.8 Using Memory Functions”) and other required parametersand data are backed up by a lithium battery in the EC750SA.
The backup period varies according to the temperature and use conditions, but it is approximately five
years when stored with the power off.
The backup data is checked at power-on, and an error message is displayed if the data has been corrupted(

See “7.2 Error Messages and ”), in which case the unit is reset to the initial values.

(

See “4.8 Using Memory Functions”.)

Theicon will blink if the backup battery has been drained and the data has been lost. If theicon still blinks after restarting several times, the battery needs to be replaced. Contact NF

Corporation or our agent.

See “Table7-18”.

8-7

EC750SA

8.5 Backup Battery

8-8EC750SA9. SPECIFICATIONS

9.1

Output  9-2

9.2

Current Limiter  9-6

9.3

Setting Range Limits  9-6

9.4

Signal Sources  9-7

9.5

Measurement Functions  9-8

9.6

Sequence Function  9-11

9.7

Arbitrary Waveform Memory 9-12

9.8

Setting Memory  9-12

9.9

Protection Functions  9-12

9.10 General  9-13
9.11

External Control I/O  9-14

9.12 External Interface  9-15
9.13 Power Input  9-15
9.14 Withstand Voltage and Insulation Resistance  9-16
9.15 Safety, EMC and RoHS  9-16
9.16 Ambient Temperature Range, Ambient Humidity Range, Etc.  9-17
9.17 External Dimensions and Weight  9-18

A value with the accuracy is the guaranteed value of thespecification. However, an accuracy noted as reference value
shows the supplemental data for reference when the productis used, and is not under the guarantee. A value without theaccuracy is the nominal value or representative value (shownas typ.).

9-1

EC750SA

9.1 Output

Unless otherwise noted, the following conditions are adopted:
Load:

Resistance load of power factor 1

Output mode:

INT (internal signal source)

Output waveform:

Sine wave

Current Limiter:

Factory default setting

Output terminals:

Terminal block on rear panel[set] indicates a setting value, and [rdg] indicates a reading value.

9.1 Outputa) Output mode

All eight modes(combination of operation mode + signal source mode)

AC-INT mode

(alternate current - internal signal source)

AC-EXT mode

(alternate current - external signal source)

AC-ADD mode

(alternate current - internal + external source)

AC-SYNC mode

(alternate current - external synchronization)

AC+DC-INT mode(direct current - internal signal source)

AC+DC-EXT mode(direct current - external signal source)

AC+DC-ADD mode(direct current - internal + external source)

AC+DC-SYNC mode(direct current - external synchronization)b) Output voltage ranges

100 V range and 200 V rangec) Maximum output power

750 VA (AC) / 750 W (DC)d) Load power factor

0 to 1 (phase lead or phase lag)Note: External power injection and regeneration are notavailable.

9-2

EC750SA

9.1 Outpute) Output terminals

Terminal block with M4 screws (rear panel)AC outlet (universal type, front panel)
Note 1: Use the AC outlet for AC (0 V AC to 250 V AC).
When DC is included, use screw terminal block on rear
panel.
Note 2: Output is floating output. The Lo terminal can begrounded.

f) Rated output voltage
100 V range:

100 Vrms (AC) / 100 V (DC)200 V range:

200 Vrms (AC) / 200 V (DC)g) Output voltage settings(When signal source mode is INT, SYNC or ADD only)
Note: The AC settings (peak value) + DC setting that can be set
are within the voltage setting limit range.
AC
100 V range:

0.0 Vrms to 155.0 Vrms (sine wave, square wave)
0.0 Vp-p to 440.0 Vp-p (arbitrary wave)

200 V range:

0.0 Vrms to 310.0 Vrms (sine wave, square wave)
0.0 Vp-p to 880.0 Vp-p (arbitrary wave)

Setting resolution:

0.1 Vrms (sine wave, square wave)
0.1 Vp-p (arbitrary wave)

Setting accuracy:

100 V range : ±(0.5% of set + 0.6 Vrms)(23 ±5°C, AC mode, 10 Vrms to 155 Vrms setting, 50 Hz or 60
Hz, sine wave, no load)
200 V range : ±(0.5% of set + 1.2 Vrms)(23 ±5°C, AC mode, 20 Vrms to 310 Vrms setting, 50 Hz or 60
Hz, sine wave, no load)DC
100 V range:−220.0 V to +220.0 V

200 V range:−440.0 V to +440.0 V

Setting resolution:

0.1 V

Setting accuracy:

100 V range : ±( |0.5 % of set| + 0.6 V)(23 ±5°C, AC+DC mode, output AC voltage setting = 0 V,
−220 V to −10 V or +10 V to +220 V setting, no load)
200 V range : ±( |0.5 % of set| + 1.2 V)(23 ±5°C, AC+DC mode, output AC voltage setting = 0 V,
−440 V to −20 V or +20 V to +440 V setting, no load)

9-3EC750SA

9.1 Outputh) Maximum output current
100 V range:

10 Arms (AC) / 10 A (DC)200 V range:

5 Arms (AC) / 5 A (DC)Note 1: The limit on the maximum output power may cause areduction in the maximum output current.
(

See “Figure 3-14” and “Figure 3-15”)

Note 2:When output frequency is 40 Hz or lower, or it is 400
Hz or higher, the maximum output current may
decrease.
Note 3:The RMS value for AC + DC is within the maximum
output current.
i) Maximum output peak current
100 V range:

30 Apk200 V range:

15 ApkNote 1: The limit on the maximum output power may cause areduction in the maximum output peak current.
Note 2: The above values are for the capacitor input typerectifier circuit.
Note 3: When output frequency is 45 Hz or lower, or it is 65 Hz
or higher, the maximum output peak current may
decrease.

j) Frequency setting (When signal source mode is INT or ADD only)
Setting range:

1.0 Hz to 550.0 Hz

Setting resolution:

0.1 HzSetting accuracy:±0.01% (23 ±5°C)k) Output on phase (When signal source mode is INT, SYNC or ADD only)
Setting range:

0.0° to 359.9°

Setting resolution:

0.1°l) Output voltage waveform (When signal source mode is INT, SYNC or ADD only)
Sine wave, square wave, arbitrary waveform (16 types)

9-4

EC750SA

9.1 Outputm) Small amplitude frequency response(When signal source mode is INT or SYNC only)
AC mode40 Hz to 550 Hz:±1%

AC+DC mode

40 Hz to 550 Hz:±1%(100 V range, output voltage is 20 Vrms, 50 Hz rating)(When signal source mode is SYNC, the condition of thefrequency is within the synchronization frequency range.)n) Output voltage distortion factor

0.5% or less

(50 Hz or 60 Hz, 50% or higher of the rated output voltage,
the maximum output current or lower, THD+N)o) Output voltage stability
Fluctuation with output current:

45 Hz to 65 Hz

Within ±0.15%

DC, 40 Hz to 550 Hz

Within ±0.5%(In the case that the output current is changed and the output
power is changed from 0% to 100% of the maximum output
power, at the output terminal)
Fluctuation with input voltage:

Within ±0.2%(The power supply input voltage is 100 V, 120 V or 230 V,
no load, the rated output voltage)p) Output DC offset
100 V range:

Within ±50 mV (typ., fine adjustment available)

200 V range:

Within ±100 mV (typ., fine adjustment available)(AC - INT mode, output voltage setting = 0 V)

9-5

EC750SA

9.2 Current Limiter

9.2 Current Limitera) Output peak current limiter
Positive current setting range:

When limiter is operating, output voltage is clipped.
100 V range: +10.0 A to +31.5 A (Initial value: +31.5 A)
200 V range: +5.0 A to +15.8 A (Initial value: +15.8 A)

Negative current setting range:

100 V range: −31.5 A to −10.0 A (Initial value: −31.5 A)
200 V range: −15.8 A to

Setting resolution:b) Output RMS current limiter
Current setting range:
Setting resolution:−5.0 A (Initial value: −15.8 A)

0.1 A
When limiter is operating, suppresses output voltage.
100 V range:

1.0 A to 10.5 A (Initial value: 10.5 A)

200 V range:

1.0 A to

5.3 A (Initial value: 5.3 A)

0.1 A

9.3 Setting Range Limitsa) Voltage setting limit (When signal source mode is INT, SYNC or ADD only)
Positive voltage setting range:
Negative voltage setting range:
Setting resolution:

100 V range:+0.1 V to +220.0 V (Initial value: +220.0 V)

200 V range:+0.1 V to +440.0 V (Initial value: +440.0 V)

100 V range: −220.0 V to−0.1 V (Initial value: −220.0 V)

200 V range: −440.0 V to−0.1 V (Initial value: −440.0 V)

0.1 Vb) Frequency setting limit(Lower limit ≤ upper limit) (When signal source mode is INT or ADD only)
Upper limit setting range:

1.0 Hz to 550.0 Hz(Initial value: 550.0 Hz)

Lower limit setting range:

1.0 Hz to 550.0 Hz(Initial value: 1.0 Hz)

Setting resolution:

0.1 Hz9-6

EC750SA

9.4 Signal Sources

9.4 Signal Sources
The signal sources that can be selected are internal (INT), external signal input (EXT), internal + external(ADD), and external synchronization (SYNC).
a) Internal signal source (INT mode, ADD mode)
See “9.1 Output”.
b) External signal input (EXT mode, ADD mode)
Gain setting range:

100 V range: 0.0 times to 220.0 times (initial value: 100.0)
200 V range: 0.0 times to 440.0 times (initial value: 200.0)

Gain setting resolution:

0.1 times

Gain accuracy:±5% (DC, or 45 Hz to 65 Hz, gain is at initial value, with rated
voltage output, no load)

Output phase to input:

In-phase

Input terminal:

BNC connector (rear panel)(also used as the external sync signal input terminal)

Input impedance:

10 kΩ

Input voltage range:−2.2 V to +2.2 V

Nondestructive maximum
input voltage:
Frequency range:±10 V
DC to 550 Hz (sine wave)
DC to 100 Hz (other than sine wave)c) External synchronization (SYNC mode)
Synchronization signal source:

External sync signal or line (select one)

Synchronization frequency range:

40 Hz to 500 Hz

Input terminal:

BNC connector (rear panel)(also used as the external signal input terminal)
Note: External sync signal is not required when line
synchronization is selected

Input impedance:

10 kΩ

Input voltage threshold value:

TTL

Minimum pulse width:

3 ms

Nondestructive maximum
input voltage:

±10

9-7

EC750SA

9.5 Measurement Functions

9.5

Measurement Functionsa) Output voltage measurement
RMS value:
Full scale:

RMS value of AC+DC
100 V range : 250.0 Vrms
200 V range : 500.0 Vrms

Display resolution:

0.1 Vrms

Measurement accuracy:

at 45 Hz to 65 Hz
100 V range : ±(0.5% of rdg + 0.3 Vrms)
200 V range : ±(0.5% of rdg + 0.6 Vrms)
at DC, 40 Hz to 550 Hz
100 V range : ±(0.7% of rdg + 0.9 Vrms)
200 V range : ±(0.7% of rdg + 1.8 Vrms)(at 23 ±5°C)

Average value:
Full scale:

Average value of AC+DC (measures DC component)
100 V range : ±250.0 V
200 V range : ±500.0 V

Display resolution:

0.1 V

Measurement accuracy:

100 V range : ±(|0.5% of rdg| + 0.4 V)
200 V range : ±(|0.5% of rdg| + 0.8 V)(at 23 ±5°C)

Peak value:

Maximum voltage and minimum voltage are displayed
separately

Full scale:

100 V range : ±250 Vpk
200 V range : ±500 Vpk

Display resolution:

1 Vpk

Measurement accuracy:

100 V range : ±(|1.5% of rdg| + 3 Vpk)
200 V range : ±(|1.5% of rdg| + 6 Vpk)
(reference value, at 23 ±5°C, sine wave of which frequency is 45
Hz to 65 Hz)b) Output current measurement
RMS value:

RMS value of AC+DC

Full scale:

15.00 Arms

Display resolution:

0.01 Arms

Measurement accuracy:

at 45 Hz to 65 Hz±(0.5% of rdg + 0.04 Arms)
at DC, 40 Hz to 550 Hz±(0.7% of rdg + 0.08 Arms)(at 23 ±5°C, output current is 5% to 100% of the maximum
output current)
9-8EC750SA

9.5 Measurement Functions

Average value:

Average value of AC+DC (measures DC component)

Full scale:±15.00 A

Display resolution:

0.01 A

Measurement accuracy:±(|0.5% of rdg| + 0.08 A)(at 23 ±5°C, output current is 5% to 100% of the maximum
output current)

Peak value:

Minimum current and maximum current are displayed
separately

Full scale:±45.0 Apk

Display resolution:

0.1 Apk

Measurement accuracy:±(|2% of rdg| + 0.4 Apk)
(reference value, at 23 ±5°C, sine wave of which frequency is 45
Hz to 65 Hz)

Peak value hold:Maximum value of | max current | and | min current |Full scale:45.0 Apk

Display resolution:

0.1 Apkc) Output power measurement
Effective power
Full scale:1200 W

Display resolution:

1W

Measurement accuracy:

at 45 Hz to 65 Hz±(2% of rdg + 1 W)
at DC±(3% of rdg + 12 W)(at 23 ±5°C, load with the power factor 0.5 to lower than 1, 50 Vor higher output voltage, output current is 10% to 100% of the
maximum output current)

Apparent power:

Calculated as output voltage RMS value × output current RMS
value

Full scale:

1400 VA

Display resolution:

1 VA

Measurement accuracy:

at 45 Hz to 65 Hz±(2% of rdg + 1 VA)
at DC±(3% of rdg + 12 VA)(at 23 ±5°C, 50 V or higher output voltage, output current is
10% to 100% of the maximum output current)

9-9EC750SA

9.5 Measurement Functions

Reactive power:
Full scale:

Calculated as
1400 var( apparent power) 2-(effective power)2

Display resolution:

1 var

Measurement accuracy:±(2% of rdg + 1 var)
(at 23 ±5°C, load with the power factor 0 to lower than 0.5,
45 Hz to 65 Hz, 50 V or higher output voltage, output current is
10% to 100% of the maximum output current)d) Load power factor measurement: Calculated as effective power / apparent power
Measurement range:

0.00 to 1.00

Display resolution:

0.01e) Load crest factor measurement: Calculated as (maximum value of | maximum current | and| minimum current |) / RMS current
Measurement range:

1.00 to 50.00

Display resolution:

0.01f) Output harmonic current measurement (AC - INT mode only, fundamental wave is 50 Hz
or 60 Hz only)
Measurement range:

To 40th harmonic of fundamental wave

Full scale:

15.00 Arms and 500.0%

Display resolution:

0.01 Arms and 0.1%

Measurement accuracy:

at RMS value current up to 10th±(1% of rdg + 0.08 Arms)
at RMS value current from 11th up to 20th±(2% of rdg + 0.08 Arms)
at RMS value current from 21st up to 40th±(5% of rdg + 0.08 Arms)(All in the case of reference value, at 23 ±5°C)
Note: This measurement does not comply with the IEC or otherstandards.

g) External synchronization frequency measurement (SYNC mode only)
Measurement range:

38.0 Hz to 525.0 Hz

Display resolution:

0.1 HzMeasurement accuracy:±0.2 Hz (at 23 ±5°C)

9-10

EC750SA

9.6 Sequence Function

9.6 Sequence Function
Output parameters can be changed abruptly or swept in sequence.
Signal source is INT only.
Sequence function settings are stored in memory with battery backup.
a) Number of sequences

1 sequence per operation mode (AC or AC+DC mode) andoutput range (100 V or 200 V)b) Number of steps

1 to 255 (within 1 sequence)c) Step time

0.1 ms to 999.9999 s (resolution 0.1 ms)d) Operations within step

Constant, keep, or linear sweepe) Parameters

DC voltage, AC voltage, frequency, waveform, andsynchronous step output (2 bits)f) Jump times

1 to 999 or infiniteg) Sequence control
Start:Starts a sequence.

Stop:

Stops a sequence.

Hold:

Maintains current step output. Restarted when a sequence isstarted.

Branch:Branches to the specified step.

9-11

EC750SA

9.7 Arbitrary Waveform Memory

9.7 Arbitrary Waveform Memory
The contents of arbitrary waveform memory are retained by battery backup.
a) Number of waveform memories

16b) Waveform length4096 wordsc) Waveform data

15 bits
Note: Arbitrary waveform memory cannot be written tofrom the panel screen.
The USB interface is used for writing.

9.8 Setting Memory
Various settings are retained in memory with battery backup, and the settings when the power source waslast turned off are restored at power-on. Among these various settings, the basic settings (output mode,
output range, DC settings, AC settings, output current limiter, and setting range limits) can be stored instore/recall memory No. 1 to No. 30. These stored settings can be recalled.
The recall operation for store/recall memory can be executed only when the output is off.

9.9 Protection Functionsa) Abnormal output

When an output overvoltage or output overcurrent is
detected, the output will be set to off and the error
message is displayed.

b) Abnormal internal power source

When an internal power source abnormality isdetected, the output will be set to off and all
operations will become disabled (system lock) except
for the power-off operation. (In some cases, output
will be set off but shutdown is not necessary.)c) Abnormal internal control

When a control abnormality is detected, the output
will be set to off and all operations will become
disabled (system lock) except for the power shutdown
operation. (In some cases, output will be set off but
shutdown is not necessary.)d) Abnormal internal temperature

When an abnormality is detected, the output will be
set to off.

9-12

EC750SA

9.10 General

9.10 Generala) LCD settings
Contrast:

Adjustable

Display color:

White background or Blue backgroundb) Beep soundOn or off
When the setting is on and a key input error or other operation
error occurs, a beep sound will be output. When a protection
function-related error occurs, an alarm sound will be output
regardless of the beep sound setting.

c) Keylock

On or off
When the setting is on, only the keylock off operation and theoutput off operation are enabled.

d) Output setting at power-on

On or off
When the setting is on, the output is automatically set to on at
power-on.

e) Reset function

This function resets all basic settings to their initial (factory)
settings.

f) Self test function

This function checks memory at power-on.

9-13

EC750SA

9.11 External Control I/O

9.11 External Control I/Oa) External control operation mode

Enabled or disabled (the state output is always on)b) Control input
Input level:

High level: +4.0 V or higher
Low level: +1.0 V or lower

Nondestructive maximum input: +10 V/−5 V
Input impedance:pull-up to +5 V at 47 kΩ

Detection cycle:

2 ms

Control items:

Output off

Output off at fall

Output on

Output on at fall

Sequence start

Start at fall

Stop of sequence

Stop at fall

Hold input

Hold at fall

Branch inputs 0, 1

Start branch at fallc) State output
Output level:

0 V/+5 V (open)

Output impedance:

100 Ω

Switching cycle:

0.1 msStatus items:

Power source on/off status

L: off,

H: on

Output on/off status

L: off,

H: on

Limiter operation

L: Not operating, H: Operating

Software busy

L: Normal,

H: Busy

Sequence operation step synchronized outputs L or Hd) Terminals

D-sub 25-pin multi-connector(rear panel, female, M2.6 screw)

9-14

EC750SA

9.12 External Interface

9.12 External Interface
USB interface and RS232 interface are provided for external control from a personal computer.
(The factory default is USB)a) USB interface
Interface standard:USB1.1, USBTMC

ID:

Already assigned to each device

Terminator:“LF”
Note: The use of USB hub may cause a communication failure.
It is recommended to use fully-shield, short cable.

b) RS232 interface
Terminal:

D-sub 9-pin (male, UNC #4 -40 screws)

Baud rate:

9600 bps/ 19200 bps(Initial value: 9600 bps)

Terminator:“CR”“LF”/”CR”/”LF”(Initial value: “CR” “LF”)

Parity:None/Odd/Even(Initial value: None)

Stop bit:

1/2(Initial value: 1 bit)

Data bit:

7/8(Initial value: 8 bit)

Flow control:

None/Hardware/Software(Initial value: None)

Note: Binary transmission is not supported. So it is notpossible to send or receive the arbitrary waveform data.
Note: Use a cross cable.

9.13 Power Inputa) Input voltage range

100 V AC to 230 V AC ±10% (not exceeding 250 V)
Overvoltage Category IIb) Frequency range

50 Hz ±2 Hz or 60 Hz ±2 Hz (single phase)c) Power consumption

1.2 kVA or lessd) Power factor (typ.)0.95 or higher (the power input voltage is 100 V, at the maximum
output power)
0.90 or higher (the power input voltage is 200 V, at the maximum
output power)

9-15

EC750SA

9.14 Withstand Voltage and Insulation Resistance

9.14 Withstand Voltage and Insulation Resistance
Between input power line vs. output/chassis or input power line/ chassis vs. outputa) Withstand voltage

AC 1500 V, 1 minuteb) Insulation resistance

30 MΩ or higher, 500 V DC

9.15 Safety, EMC and RoHS
Only Models with a CE Marking on the Rear Panel.
a) Safety

Compliant with the following standard requirement
EN61010-1
Pollution Degree 2b) EMC

Compliant with the following standard requirement
EN61326-1 (Group 1, Class A)
EN61000-3-2
EN61000-3-3
Note: This product may cause interference if used in residential
areas. Such use must be avoided unless the user takes
special measures to reduce electromagnetic emissions toprevent interference to the reception of radio andtelevision broadcasts.

c) RoHS

Compliant with the followng
Directive 2011/65/EU

9-16

EC750SA

9.16 Ambient Temperature Range, Ambient Humidity Range, Etc.

9.16 Ambient Temperature Range, Ambient Humidity
Range, Etc.
a) Operating environment

Indoor useb) Altitude2000 m or lowerc) Operation guarantee

0 °C to +40°C,5 % to 85% RH
When absolute humidity is 1 g/m3 to 25 g/m3, with nocondensationd) Performance guarantee+5 °C to +35°C, 5 % to 85% RH
When absolute humidity is 1 g/m3 to 25 g/m3, with nocondensation−10 °C to +50°C, 5 % to 95% RHe) Storage condition

When absolute humidity is 1 g/m3 to 29 g/m3, with nocondensation
Figure 9-1 shows the ambient temperature and humidity ranges.

%RH
Storage condition

90
80

Performance
guarantee

70
60
50

Operation
guarantee

40
30
20
10
0

−10

0

10

20

30

40

50 °C

Figure 9-1. Temperature and Humidity Ranges

9-17

EC750SA

9.17 External Dimensions and Weight

9.17 External Dimensions and Weighta) External dimensions
Width:

258 mmHeight:

176 mmDepth:

440 mm(Projections are not included.)b) Weight

Approximately 9.7 kg

Figure 9-2 shows the external dimensions.

9-18

EC750SABuilt-in air filter

9-19

Detailed view of cover labels

Rear View

Front View

Cover labels

Protective coverSurface treatment
Front panel:
Ultra-light gray (Munsell 6PB9.2/0.1)
Rear panel:
Dark Brown (Munsell 8.5PB2.6/0.2)
Covers:Light gray leather tone (Munsell 6PB7.6/1.2 leather tone)

Left Side View

Right Side View

9.17 External Dimensions and Weight

Figure 9-2. External Dimensions

EC750SA

9.17 External Dimensions and Weight

9-20

EC750SAーーーー
ーーーー WARRANTY ーーーー
ーーーー
NF Corporation certifies that this product was thoroughly tested and inspected and found tomeet its published specifications when it was shipped from our factory. In the unlikely eventthat you experience an issue during use, please contact our company or agency of ourcompany from which you purchased the product.
All NF products are warranted against defects in materials and workmanship for a period of
one year from the date of shipment. During the warranty period, NF will repair the defective
product without any charge for the parts and labor.
For repair service under warranty, the product must be returned to either NF or an agent
designated by NF. The Purchaser shall prepay all shipping cost, duties and taxes for the
product to NF from another country, and NF shall pay shipping charges to return the productto the purchaser.
This warranty shall not apply when corresponding to following particulars.
A) Failure caused by improper handling or use of the product in a manner that does notconform with the provisions of the Instruction Manual.
B) Failure or damage caused by transport, dropping, or other handling of the productafter purchase.
C) Failure caused by repair, adjustment, or modification of the product by a company,
organization, or individual not approved by NF.
D) Failure caused by abnormal voltage or the influence of equipment connected to thisproduct.
E) Failure caused by the influence of supply parts from the customer.
F) Failure caused by such as corrosion that originate in the use of causticity gas,organic solvent, and chemical.
G) Failure caused by the insect or small animal that invaded from the outside.
H) Failure or damage caused by fire, earthquakes, flood damage, lightning, war, orother uncontrollable accident.
I) Failure caused by the reason that was not able to be foreseen by the science andtechnology level when shipped from our company.
J) Replacement and replenishment of consumables such as batteries.

NF CorporationWABUN(DA00048903)

If there are any misplaced or missing pages, we will replace the manual. Contact thesales representative.

NOTES• Reproduction of the contents of this manual is forbidden by applicable laws.
• The contents of this manual may be revised without notice.
• Information provided in this manual is intended to be accurate and reliable. However,
we assume no responsibility for any damage regarding the contents of this manual.
• We assume no responsibility for influences resulting from the operations in thismanual.
© Copyright 2015-2017, NF CORPORATIONPROGRAMMABLE AC/DC POWER SOURCE
EC750SA Instruction Manual

NF Corporation
6-3-20, Tsunashima Higashi, Kohoku-ku, Yokohama
223-8508 JAPAN
Phone +81-45-545-8128 Fax +81-45-545-8187

http://www.nfcorp.co.jp/

NF Corporation
6-3-20, Tsunashima-higashi, Kohoku-ku, Yokohama 223-8508 JAPAN