MULTIFUNCTION GENERATOR

WF1973/WF1974
Instruction Manual (Basics)

NF Corporation

Preface
Thank you for purchasing the WF1973/WF1974 Multifunction Generator.
To ensure safe and proper use of this electric equipment, please read first Safety Precautions on
the following 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 theequipment.

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 theequipment.

CAUTION

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

●This manual has the following chapter organization.
Instruction manuals of the WF1973/WF1974 are divided to two volumes, Basics andApplication. Instructions for remote control (GPIB and USB) are provided separately.
If reading this manual for the first time, start from 1. OVERVIEW of the Basics Instruction
Manual.
Basics
1. OVERVIEW
Briefly describes and explains the features and brief operation principles of the WF1973/
WF1974.
2. PREPARATIONS BEFORE USE
Describes various cautions regarding preparations to be made before using the WF1973/
WF1974, ranging from installation to connection of the power supply.
3. PANELS AND I/O TERMINALSDescribes the functions and operations of the switches and I/O terminals of the panel
controls.
4. BASIC OPERATION
Describes how to use basic functions.
5. SAVING AND RECALLING SETTINGS
Describes how to store and retrieve the settings.
6. LIST OF INITIAL SETTINGS
Describes initial settings.
7. SPECIFICATIONS
Lists the specifications (functions and performance) of the WF1973/WF1974.
Application
1. DETAILS OF PARAMETER-VARIABLE WAVEFORMS
Explains the meanings of each parameter of parameter-variable waveforms andwaveform examples.
2. CREATING ARBITRARY WAVEFORMS
Explains how to input and edit arbitrary waveforms from the panel control.

WF1973/WF1974

I3. HANDY USE OF 2-CHANNEL DEVICE (WF1974 ONLY)
Explains how to operate two channels at the same time.
4. SYNCHRONIZING MULTIPLE UNITS
Describes how to configure a multi-phase oscillator by connecting multiple units of thisproduct.
5. USING EXTERNAL FREQUENCY REFERENCE
Describes how to use external frequency reference.
6. USING SEQUENCE OSCILLATION
Describes how to set and operate sequence oscillation.
7. USING USER-DEFINED UNITS
Explains the units that can be optionally set by users.
8. OTHER UTILITY SETTINGS
Explains how to set display and operational details.
9. TROUBLESHOOTING
Explains error messages and how to respond to cases where a failure is suspected.
10. MAINTENANCE
Explains the operational inspection and performance test.

II

MULTIFUNCTION GENERATOR

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 thesewarnings and cautions.
This product is a Class I 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 such that ground resistance is 100 Ω or lower.
The WF1973/WF1974 is automatically grounded when the 3-prong power plug is connected
to a 3-prong power outlet with a protective grounding contact.
This product does not come with a 3-prong to 2-prong conversion adapter. When using aseparately sold 3-prong to 2-prong conversion adapter, be sure to connect the (green)
grounding wire of the adapter to the grounding terminal next to the outlet.
●Check the power supply voltage.
This product operates on the power supply voltage shown in 2.3 Grounding and Power
Supply Connection in the Basics 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
and stop using it.
If such an anomaly occurs, do not use this product until it has been repaired, andimmediately report the problem to the location of purchase (either NF Corporation or your
distributor).
●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
this product from repair in case of failure.

WF1973/WF1974

III●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.

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

CAUTION

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

●Other symbols
This symbol indicates that the external conductor of the connector isconnected to the case.

This symbol shows that the external conductor of the connector isinsulated from the case.
It shows, however, that the potential difference from the grounding
potential is restricted to 42 Vpk or lower for safety. (Since this product isgrounded when used, the potential of the case equals the grounding
potential.)●Waste disposal
To help ensure environmental protection, use a professional industrial waste contractor todispose of this product. A battery is not used for this product.

IV

MULTIFUNCTION GENERATORContents
Preface .................................................................................................................I
Safety Precautions..............................................................................................III
Contents ............................................................................................................. V
Figures and Tables .......................................................................................... VIII
1. OVERVIEW ....................................................................................................1
1.1

Features............................................................................................................. 1

1.2

Operating Principles .......................................................................................... 2

2. PREPARATIONS BEFORE USE ...................................................................4
2.1

Checking Before Use......................................................................................... 4

2.2

Installation.......................................................................................................... 5

2.3

Grounding and Power Supply Connection......................................................... 6

2.4

Calibration.......................................................................................................... 7

3. PANELS AND I/O TERMINALS......................................................................8
3.1 Panel Components and Operations................................................................... 8
3.1.1 Front panel of WF1973 .............................................................................. 8
3.1.2 Rear panel of WF1973 ............................................................................... 9
3.1.3 Front panel of WF1974 ............................................................................ 10
3.1.4 Rear panel of WF1974 ............................................................................. 11
3.2 I/O Terminals ................................................................................................... 123.2.1 Waveform output (FCTN OUT) ................................................................ 12
3.2.2 Sync/sub-output (SYNC/SUB OUT)......................................................... 13
3.2.3 External modulation/addition input (MOD/ADD IN) .................................. 14
3.2.4 External trigger input (TRIG IN) ............................................................... 14
3.2.5 External 10 MHz frequency reference input (10 MHz REF IN) ................ 15
3.2.6 Frequency reference output (REF OUT).................................................. 16
3.2.7 Multi-I/O (MULTI I/O)................................................................................ 16
3.3

Cautions on Floating Ground Connection........................................................ 19

4. BASIC OPERATION.....................................................................................21
4.1 Power on/off Switching and Restoration of Settings........................................ 21
4.1.1 Power on/off switching method ................................................................ 21
4.1.2 Restoration of settings at power-on ......................................................... 22
4.2 Screen Configuration and Operation .............................................................. 25
4.2.1 Screen configuration ................................................................................ 25
4.2.2 Switching display format with tabs (displaying waveform graph) ............. 27
4.2.3 Top menu ................................................................................................. 29
4.3

WF1973/WF1974

Basic Settings and Operations ........................................................................ 30V4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.6
4.3.7
4.3.8
4.3.9

Changing the frequency, amplitude, and other values............................. 30
Changing the waveform and oscillation mode ......................................... 33
Manipulating shortcut keys for changing basic parameters ..................... 34
Operations of ENTER key, CANCEL key, and UNDO key ..................... 35
Changing the display unit......................................................................... 36
CH1/CH2 switching key and active channel (WF1974 only).................... 38
Actions possible in the Utility screen........................................................ 39
Restoring the initial settings ..................................................................... 41
Output on/off ............................................................................................ 41

4.4 Setting Methods for Main Items ....................................................................... 43
4.4.1 Configuration of text display screen in continuous oscillation mode ........ 43
4.4.2 Setting the oscillation mode ..................................................................... 43
4.4.3 Setting the waveform ............................................................................... 44
4.4.4 Setting the frequency ............................................................................... 44
4.4.5 Performing setting with period.................................................................. 45
4.4.6 Setting the phase ..................................................................................... 45
4.4.7 Setting the amplitude ............................................................................... 48
4.4.8 Setting DC offset ...................................................................................... 50
4.4.9 Setting the output level with high level/low level ...................................... 51
4.4.10 Setting the waveform polarity and amplitude range ............................... 52
4.4.11 How to use auto range/range hold for the output voltage ...................... 54
4.4.12 Setting the load impedance.................................................................... 55
4.4.13 Adding external signal............................................................................ 57
4.4.14 Setting the square wave duty................................................................. 59
4.4.15 Setting the pulse width and leading/trailing edge time of a pulse wave . 61
4.4.16 Setting the ramp wave symmetry........................................................... 64
4.5

Using Parameter-Variable Waveforms ............................................................ 65

4.6

Using Arbitrary Waveforms.............................................................................. 67

4.7 Modulation Setting and Manipulation............................................................... 69
4.7.1 Modulation types ...................................................................................... 69
4.7.2 Screen for modulation setting and manipulation ...................................... 70
4.7.3 Common modulation settings and manipulations .................................... 72
4.7.4 Setting FM................................................................................................ 75
4.7.5 Setting FSK .............................................................................................. 76
4.7.6 Setting PM................................................................................................ 77
4.7.7 Setting PSK.............................................................................................. 78
4.7.8 Setting AM................................................................................................ 79
4.7.9 Setting AM (DSB-SC)............................................................................... 80
4.7.10 Setting DC offset modulation ................................................................. 81
4.7.11 Setting PWM .......................................................................................... 82
4.8 Sweep Setting and Manipulation ..................................................................... 83
4.8.1 Sweep types............................................................................................. 83
4.8.2 Screen for sweep setting and manipulation ............................................. 83

VI

MULTIFUNCTION GENERATOR

4.8.3
4.8.4
4.8.5
4.8.6
4.8.7
4.8.8

Common sweep settings and manipulations............................................ 86
Setting frequency sweep.......................................................................... 95
Setting phase sweep................................................................................ 97
Setting amplitude sweep .......................................................................... 99
Setting DC offset sweep......................................................................... 101
Setting duty sweep................................................................................. 103

4.9 Burst Setting and Manipulation...................................................................... 105
4.9.1 Burst oscillation types ............................................................................ 105
4.9.2 Auto burst............................................................................................... 106
4.9.3 Trigger burst........................................................................................... 109
4.9.4 Gate oscillation....................................................................................... 113
4.9.5 Triggered gate oscillation ....................................................................... 118

5. SAVING AND RECALLING SETTINGS .....................................................122
5.1

Saving Settings.............................................................................................. 122

5.2

Recalling Settings .......................................................................................... 124

6. LIST OF INITIAL SETTINGS ......................................................................126
7. SPECIFICATIONS......................................................................................129
7.1

Oscillation Modes .......................................................................................... 129

7.2 Waveforms..................................................................................................... 129
7.2.1 Standard waveforms .............................................................................. 129
7.2.2 Arbitrary waveforms ............................................................................... 129
7.3

Frequency, Phase.......................................................................................... 130

7.4 Output Characteristics ................................................................................... 130
7.4.1 Amplitude ............................................................................................... 130
7.4.2 DC offset ................................................................................................ 130
7.4.3 Load impedance setting ......................................................................... 131
7.4.4 Waveform output.................................................................................... 131
7.4.5 Sync/sub output ..................................................................................... 131
7.5 Signal Characteristics .................................................................................... 131
7.5.1 Sine wave............................................................................................... 131
7.5.2 Square wave .......................................................................................... 132
7.5.3 Pulse wave............................................................................................. 132
7.5.4 Ramp wave ............................................................................................ 133
7.5.5 Parameter-variable waveforms .............................................................. 133
7.6 Modulated Oscillation Mode .......................................................................... 136
7.6.1 General .................................................................................................. 136
7.6.2 Modulation conditions ............................................................................ 137
7.7 Sweep Oscillation Mode ................................................................................ 138
7.7.1 General .................................................................................................. 138
7.7.2 Sweep conditions ................................................................................... 139

WF1973/WF1974

VII

7.8

Burst Oscillation Mode................................................................................... 139

7.9

Triggers.......................................................................................................... 140

7.10

Sequence..................................................................................................... 141

7.11

Other I/Os .................................................................................................... 142

7.12

2-channel ganged operation (WF1974 only) ............................................... 143

7.13

Synchronous Operation of Multiple Units .................................................... 144

7.14

User-Defined Units ...................................................................................... 144

7.15

Other Functions ........................................................................................... 145

7.16

Options ........................................................................................................ 145

7.17

General Characteristics ............................................................................... 145■ External dimensions (WF1973) ......................................................................... 147■ External dimensions (WF1974) ......................................................................... 148

RACK MOUNTING DIMENSIONS ..................................................................149■ Inch rack mounting dimensions (for 1 unit) ........................................................ 149■ Inch rack mounting dimensions (for 2 units) ...................................................... 150■ Millimeter rack mounting dimensions (for 1 unit) ............................................... 151■ Millimeter rack mounting dimensions (for 2 units).............................................. 152

Index ................................................................................................................153
WARRANTY ....................................................................................................157

Figures and Tables
Figure 3-1. Front Panel of WF1973............................................................................ 8
Figure 3-2. Rear Panel of WF1973 ............................................................................ 9
Figure 3-3. Front Panel of WF1974.......................................................................... 10
Figure 3-4. Rear Panel of WF1974 .......................................................................... 11
Figure 3-5. Multi-I/O Connector Pin Assignment...................................................... 17
Figure 3-6. Cautions on Floating Ground Connection for WF1973 .......................... 20
Figure 3-7. Cautions on Floating Ground Connection for WF1974 .......................... 20
Table 3-1. Signals Selectable for Sync/Sub-Output ................................................. 13
Table 3-2. Multi-I/O Connector Function Allocation.................................................. 18

VIII

MULTIFUNCTION GENERATOR

1.
1.1

OVERVIEW

Features

The WF1973 and WF1974 are multifunctional generators based on direct digital synthesizers(DDS).
The WF1973 is a 1-channel generator, while the WF1974 is a two-channel generator.
• Highest frequency: 30 MHz (sine wave), 15 MHz (square wave, pulse)• Frequency accuracy: ±(3 ppm + 2 pHz), high resolution of 0.01 μHz. 10 MHz externalfrequency reference can be used.
• Maximum output voltage: 20 Vp-p/open, 10 Vp-p/50 Ω• Large number of standard parameter-variable waveforms: Sine wave, square wave
(variable duty), pulse (variable pulse width/duty, leading edge time, trailing edge time),
ramp wave (variable symmetry), CF controlled sine wave (variable crest factor), staircase
sine wave (variable number of steps), Gaussian pulse (variable σ), Sin(x)/x (variable
number of zero crossings), exponential rise/fall (variable time constant), damped
oscillation (variable oscillation frequency, damping time constant), pulse surge (variablerising and duration times), trapezoid (variable rise, fall, and upper base width), and so on.
• Large-capacity arbitrary waveform memory: 512 K words max., saving capacity: 128
waveforms/4 M words• Phase and waveform remain continuous even when frequency is changed or during
frequency sweep.
• Square wave, pulse with variable duty and high resolution of 0.0001%• Pulse with variable leading edge time and trailing edge time
• Various oscillation modes• Continuous oscillation• Modulation: FM, FSK, PM, PSK, AM, DC offset modulation, PWM• Sweep: Frequency, phase, amplitude, DC offset, duty
• Burst oscillation: Auto burst, trigger burst, gate oscillation, triggered gate oscillation• Sequence oscillation: Variable waveform/ frequency/ phase/ amplitude/ DC offset/
square wave duty, constant value/ linear interpolation, jump/ repeat/ hold/ branch• Sequence function for easy test waveform creation and adjustment
Flexible waveform creation possible through combination with standard parametervariable waveforms
Frequency, phase, amplitude, etc., can be rapidly changed and swept• Intuitive user interface through use of high-resolution QVGA TFT color LCD• Two-channel ganged function with 2 phases, constant frequency difference, constantfrequency ratio, and differential output (only WF1974)• Floated from housing for each channel to reduce effect of ground loop
• Multiple-phase oscillator can be configured by synchronizing multiple units• USB and GPIB interfaces provided• Thin and lightweight: Height of approx. 9 cm, weight of approx. 2.1 kg

WF1973/WF1974

11. OVERVIEW

1.2

Operating Principles■ WF1973 block diagram
ANALOGA/DWAVE
MEMORY

EXTERNAL
MODULATIONLPF

EXTERNAL
ADDITION

16bit
512Kw
PGA

r1V

MOD/ADDIN

2r2Vmax

FCTN
OUT

LPF
ISOLATION
DDS

0/-10/-20/-30dB

16bit2CH
D/A

5

r10Vmax

TTL/r3V
LPF

SYNC/SUBOUT

120MHz
CLOCK
GENERATOR

D/ADC OFFSET

20MHz

100V...230V

㨪LINE
AC/DC

10MHz REF IN+12V

REF OUT

for ANALOG

TRIG IN

for SYSTEMCONTROLLERSYSTEMCONTROLLER

FRONT
PANEL
UNIT

USB

GPIB

POWER
SUPPLY
FAN

MULTI
I/O

■ Analog block• The DDS (digital direct synthesizer) uses a 120 MHz clock to generate various types ofoscillation and waveforms. Modulation, sweep, burst, and sequence are also processed
within the DDS.
• The digital waveforms generated by the DDS are controlled to the specified polarity(normal, inversed) in the amplitude range (−FS/0, ±FS, 0/+FS), and following digital
amplitude adjustment, the signal is input into the digital to analog (D/A) converter.
• The waveform converted into an analog signal by the D/A is then smoothed by the lowpass
filter (LFP), and the amplitude is controlled in 10 dB steps by the programmable gain
amplifier (PGA).
• The external addition signal and DC offset are added to the PGA output. When an output
voltage exceeding ±2V/open is required, output is done via the ×5 amplifier.
• The maximum output voltage of the product is either 20 Vp-p or 4 Vp-p depending onwhether or not the ×5 amplifier is used. Also depending on this, the external addition gain
is either ×10 or ×2.
• After passing through the LPF, the external modulation signal undergoes A/D conversion
and is then input to the DDS.

2

MULTIFUNCTION GENERATOR

1.2 Operating Principles■ WF1974 block diagram
ANALOG CH2ANALOG CH1
EXTERNAL
MODULATION

LPF

A/D

WAVE
MEMORY

EXTERNAL
ADDITION

16bit
512Kw
PGA

r1V

MOD/ADDIN

2r2Vmax

FCTN
OUT

LPF
ISOLATION

0/-10/-20/-30dB

16bit2CH
D/A

DDS

5

r10Vmax

TTL/r3V
LPF

SYNC/SUBOUT

120MHz
CLOCK
GENERATOR

D/ADC OFFSET

20MHz

100V...230V

㨪LINE
AC/DC

10MHz REF IN+12V

REF OUT

for ANALOG CH1

TRIG IN CH1

for ANALOG CH2

TRIG IN CH2

for SYSTEMCONTROLLERSYSTEMCONTROLLER

FRONT
PANEL
UNIT

USB

GPIB

POWER
SUPPLY

FAN

MULTI
I/O

• The analog block is insulated from the system controller block located in the housing
potential.
• In the WF1974, the analog block comprises two channels, each individually isolated fromthe housing potential.

■ System controller block• This block performs control of the analog block, including the display, panel key
processing, remote control (GPIB, USB) processing, trigger input processing, frequency
reference control, DDS control, amplitude, and DC offset.
• A 20 MHz crystal oscillator is used as the basic oscillation of the DDS.
• The signal to synchronize multiple units is sent to REF OUT (frequency reference output),and the inter-channel sync (WF1974 only) is sent to the analog block of each channel.

■ Power supply block• The AC/DC directly connected to the power supply input is in a constantly powered state.
• Control of each power supply circuit is done through power switch manipulation.

WF1973/WF1974

3

2.
2.1

PREPARATIONS BEFORE USE

Checking Before Usea) Safety check
To ensure safety in using the WF1973/WF1974, the user should read the following sectionsof this instruction manual before using the WF1973/WF1974:• Safety Precautions (provided at the beginning of this instruction manual)• 2.3 Grounding and Power Supply Connectionb) Appearance and accessories check
If an abnormality (such as a flaw or dent) is found on the outside surface of the corrugatedbox, carefully check if the product is adversely affected when removing the product from thecorrugated box.
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 its representative.
• Appearance check
Check that no abnormalities such as a flaw and dent are found on the panel, controls,connectors, and so forth.
• Configuration and accessory check
The accessories of this product are listed below. Check that there are no missing items
and no flaws are found.
Main unit................................................................................................................. 1
Instruction Manual (Basics)................................................................................... 1
CD (PDF instruction manuals, application software) .......................................... 1
PDF instruction manuals:
Basics, Application, Remote Control,
Arbitrary Waveform Editing Software, Sequence Editing Software,
LabVIEW Driver
Application software:
Arbitrary Waveform Editing Software, Sequence Editing Software,
LabVIEW DriverPower cord set (2 m, with 3-prong plug)................................................................ 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.

4

MULTIFUNCTION GENERATOR

2. PREPARATIONS BEFORE USEc) Panel and case cleaning
Use a soft cloth to wipe dust from the panel and case. If soiling is severe, moisten the clothwith a neutral detergent and wring it out well.
Do not use volatile substances such as thinners and benzene, or commercial wipes, as thesemay deform or peel the finish.

d) Rack mounting method
When provided with a rack mount adapter (option), this equipment can be mounted on a 19inch IEC, EIA standard rack, or JIS standard rack. Either one unit, or two side-by-side
units, can be mounted.
First, attach the rack mount adapter to the main unit, and then mount the main unit into
the rack. For the rack mount adapter handling method, refer to the manual included withthe adapter.
When rack mounting the main unit, observe the following cautions.
• Be sure to install rails in the rack to support the equipment.
• Mounting the equipment into a fully enclosed rack may cause it to fail due to risingtemperature.
Be sure to provide sufficient ventilation openings and forcibly cool the inside of the rackwith fans.
For external dimensions for rack mounting, refer to:Inch rack mounting dimensions (for 1 unit) ) p. 149
Inch rack mounting dimensions (for 2 units) ) p. 150
Millimeter rack mounting dimensions (for 1 unit) ) p. 151
Millimeter rack mounting dimensions (for 2 units) ) p. 152

2.3

Grounding and Power Supply Connectiona) Grounding
Be sure to ground the equipment.

WARNING This product uses a line filter. Be sure to ground this product. Otherwise, anelectric shock may occur.
To prevent electric shock, be sure to safely implement grounding such thatground resistance is 100 Ω or lower.
When a 3-prong power plug that includes a protective ground contact is connected to a 3prong power supply outlet, this product is grounded automatically.
This product does not come with a 3-prong to 2-prong conversion adapter. When using aseparately sold 3-prong to 2-prong conversion adapter, be sure to connect the grounding
wire of the adapter to the grounding terminal next to the outlet.

b) Power supply conditions
Voltage range: 100 V AC to 230 V AC ±10% (250 V or lower)
Frequency range: 50 Hz/60 Hz
Power consumption: WF1973: 50 VA or lower; WF1974: 75 VA or lower

6

MULTIFUNCTION GENERATOR

2.4 Calibrationc) Power supply connection procedure
1) Check that the commercial power supply voltage to be connected is within the voltage
range specified for the equipment.
2) Connect the power cord to the power supply inlet on the rear panel of the equipment.
3) Connect the power cord plug to the 3-prong power supply outlet.
The withstand voltage of the main unit proper is 1500 Vrms (AC).

CAUTION

2.4

The power cord supplied with this equipment is designed to be used for thisequipment only. Do not use this power cord for other equipment or purposes.

Calibration

This equipment should undergo performance testing about once a year as a guideline,
although this depends on the usage environment and usage frequency. Moreover, when using
this equipment to perform important measurements and tests, the execution of a performance
test immediately before is recommended.
Performance testing of this equipment should be performed by a person with generalknowledge of test instruments and experienced in their operation.
For details on performance tests, ) “10. MAINTENANCE” in the Application Instruction
Manual.

WF1973/WF1974

7

3.
3.1

PANELS AND I/O TERMINALS

Panel Components and Operations
This section describes the names and functions of the various components on the front andrear panels.

3.1.1 Front panel of WF1973
Figure 3-1. Front Panel of WF1973

Numeric keypad
Used for numerical input) p. 31
Basic parameter
shortcut keys
Press to allow the waveform,
frequency, amplitude, and DC
offset to be changed) p. 34
MENU key
Displays the top menu
) p. 29
LCD panel

UNDO keyPress to undo setting changes.
) p. 35CANCEL key
Press to cancel.
) p. 35
ENTER keyPress to enter a setting.
) p. 35
Arrow keys
Press to select items, or increase/decrease values.
) p. 30
Modify knob
Press to select items, or increase/decrease values.
) p. 30
Manual trigger key
Used for sweep, burst trigger) pp. 90, 111, 115, 120
Triggered lamp
Lights when a trigger is accepted) pp. 90, 111, 115, 120

Power switch) p. 21
Soft keys
The manipulation
parameter is displayed on
the LCD panel.
) p. 26
NEXT keyPress to switch setting
screen pages.
) p. 26

External trigger input terminal) p. 14External modulation/addition input terminal) p. 14
Sync/sub-output terminal) p. 13

Waveform output on/off key
Press to switch waveform output on/off.
When on, the lamp on the left is lit.
) p. 41
Waveform output terminal) p. 12Figure 3-1. Front Panel of WF1973

8

MULTIFUNCTION GENERATOR

3.1 Panel Components and Operations

3.1.2 Rear panel of WF1973
Figure 3-2. Rear Panel of WF1973

Exhaust vent) p. 5

Power supply input) p. 6
USB connector

GPIB connector
Multi-I/O connector
Used for sweep, sequence control,sync code output) p. 16
Frequency reference output terminal) p. 16
External 10 MHz frequency reference input
terminal) p. 15

Figure 3-2. Rear Panel of WF1973

WF1973/WF1974

9

3. PANELS AND I/O TERMINALS

3.1.3 Front panel of WF1974
Figure 3-3. Front Panel of WF1974

Numeric keypad
Used for numerical input) p. 31
Basic parameter
shortcut keys
Press to allow the waveform,
frequency, amplitude, and DC
offset to be changed) p. 34
MENU key
Displays the top menu
) p. 29
LCD panel

UNDO keyPress to undo setting changes) p. 35CANCEL key
Press to cancel.
) p. 35
ENTER keyPress to enter a setting) p. 35
Arrow keys
Press to select items, orincrease/decrease values) p. 30
Modify knob
Press to select items, orincrease/decrease values) p. 30
Manual trigger key
Used for sweep, burst trigger) pp. 90, 111, 115, 120
Triggered lamp
Lights when a trigger is accepted) pp. 90, 111, 115, 120

Power switch) p. 21
Soft keys
The manipulation
parameter is displayed on
the LCD panel.
) p. 26
NEXT keyPress to switch setting
screen pages.
) p. 26
CH1/CH2 switching key
Press to switch the channel
to be set on the LCD panel.
) p. 38

CH2 sync/sub-output terminal) p. 13
CH2 waveform output on/off key
Press to switch CH2 waveform output on/off.
When off, the lamp on the left is lit.
) p. 41
CH2 waveform output terminal) p. 12
CH1 sync/sub-output terminal) p. 13
CH1 waveform output on/off key
Press to switch CH1 waveform output on/off.
When on, the lamp on the left is lit.
) p. 41
CH1 waveform output terminal) p. 12Figure 3-3. Front Panel of WF197410

MULTIFUNCTION GENERATOR

3.1 Panel Components and Operations

3.1.4 Rear panel of WF1974
Figure 3-4. Rear Panel of WF1974

CH1 external trigger input terminal) p. 14
CH2 external trigger input terminal) p. 14
Exhaust vent) p. 5

Power supply input) p. 6
USB connector

GPIB connector
Multi-I/O connector
Used for sweep, sequence control,sync code output) p. 16
Frequency reference output terminal) p. 16
External 10 MHz frequency reference input
terminal) p. 15
CH2 external modulation/addition input
terminal) p. 14
CH1 external modulation/addition input
terminal) p. 14

Figure 3-4. Rear Panel of WF1974

WF1973/WF1974

11

3. PANELS AND I/O TERMINALS

3.2

I/O Terminals
WARNING To prevent electric shocks, do not apply a voltage exceeding 42 Vpk (DC+ACpeak) between the ground of the BNC connectors insulated from the housing
and the housing.
Also, do not apply a voltage exceeding 42 Vpk (DC+AC peak) between the
grounds of the BNC connector groups insulated from the housing. “BNC
connector group”, as used here, refers to multiple BNC connectors that areconnected to a common ground.
If such a voltage were to be applied, the internal voltage limiting elements will
try to curb the working voltage, but if the voltage is too large, equipment burnout
may result.
) p. 19

CAUTION

Do not apply a voltage from external to the output terminal, as this may damage
the equipment.

CAUTION

Do not apply a voltage exceeding the maximum input level to the input terminal,as this may damage the equipment.

CAUTION

If there is a difference in potential between the ground of a BNC connector
insulated from the housing and the housing, do not short circuit the hot side ofthat BNC connector and the housing, as this may damage the equipment.

CAUTION

If a difference in potential exists between the grounds of the BNC connectors,
do not short circuit these BNC connector grounds, as this may damage theequipment.

3.2.1 Waveform output (FCTN OUT)
WF1973

WF1974FCTN OUT[Insulated from housing]

CH1
FCTN OUT[Insulated from housing]

CH2
FCTN OUT[Insulated from housing]This is the main output.
■ Output characteristics

12

Output voltage

Maximum ±10 V/open

Output impedance

50 Ω

Load impedance

0 Ω or higher (short-circuit protection provided)

Signal GND

Insulation from the housing (42 Vpk max.)
WF1974: Insulation also between channels (42 Vpk max.)

MULTIFUNCTION GENERATOR

3.2 I/O Terminals

3.2.2 Sync/sub-output (SYNC/SUB OUT)
WF1973

WF1974

SYNC/SUBOUT[Insulated from housing]

CH1
SYNC/SUBOUT[Insulated fromhousing]

CH2
SYNC/SUBOUT[Insulated fromhousing]

A sync signal is output according to the waveform or oscillation status. This signal can beused as the oscilloscope synchronization signal.
As shown in the following table, the output signal can be selected according to theoscillation mode.
Table 3-1. Signals Selectable for Sync/Sub-Output
Oscillation Mode

Selectable Output Signal

All

50% duty TTL level logic signal that rises at zero phase position ofreference phase of waveform output (hereafter, reference phase sync
signal).
The phase relationship with waveform output can be changed.
) p. 45

Modulation mode withinternal modulation
source) p. 74

・Reference phase sync signal
・Internal modulation signal (−3 V to +3 V/open)
・TTL level logic signal synchronized with internal modulation signal

Sweep oscillation mode
) p. 92

・Reference phase sync signal
・Sweep X drive signal (0 V to +3 V/open)
・TTL level logic signal synchronized with sweep, marker signal mixing
possible

Burst oscillation mode
) pp. 108, 111, 115, 120

・Reference phase sync signal
・TTL level logic signal synchronized with burst oscillation

Sequence oscillationmode) “6.2 Basics” in the
Application Instruction
Manual・Reference phase sync signal
・TTL level logic signal synchronized with sequence step■ Output characteristics
Output voltage

TTL level (low: 0.4 or lower; high: 2.7 V or higher), −3 V to +3 V/open,
0 V to +3 V/open

Output impedance

50 Ω

Load impedance

50 Ω or higher recommended

Signal GND

Same potential as same channel waveform output, insulated fromhousing (42 Vpk max.).
WF1974: Insulation also between channels (42 Vpk max.)

WF1973/WF1974

13

3. PANELS AND I/O TERMINALS

3.2.3 External modulation/addition input (MOD/ADD IN)
WF1973

WF1974

CH1
MOD/ADDIN[Insulated fromhousing]

MOD/ADDIN[Insulated from housing]

CH2
MOD/ADDIN[Insulated fromhousing]

When the modulation source is external, except for FSK and PSK, an external modulation
signal is input. In the case of the FSK and PSK, the external trigger input is used asexternal modulation signal input.
When not used as external modulation signal input, MOD/ADD IN may be used as theexternal addition signal input. The gain during external addition is either ×2 or ×10.
External modulation input: ) p. 73.
External addition input: ) p. 57.
■ Input Specifications
Input voltage±1 V full scale

Maximum allowed input±2 V

Input impedance

10 kΩ

Input frequency

During modulation: DC to 25 kHz
During addition: DC to 10 MHz (−3 dB)

Signal GND

Same potential as same channel waveform output, insulated fromhousing (42 Vpk max.).
WF1974: Insulation also between channels (42 Vpk max.)

3.2.4 External trigger input (TRIG IN)
WF1973

WF1974

CH2
TRIG
IN

TRIG
IN

CH1
TRIG
IN

TRIG IN may be used as external trigger input in the following cases. The polarity setting
can be changed.
• Single-shot sweep start trigger

14) p. 90.

• Gated single-shot sweep start trigger) p. 90.

• Trigger burst oscillation start trigger) p. 111.

MULTIFUNCTION GENERATOR

3.2 I/O Terminals• Gate of gated oscillation) p. 115.

• Triggered gate oscillation trigger) p. 120.

• Sequence oscillation start trigger ) “6.2 Basics” in the Application Instruction Manual
TRIG IN can also be used as the external modulation input for FSK and PSK ) p. 73■ Input Characteristics
Input voltage

TTL level (low: 0.8 V or lower; high: 2.6 V or higher)

Maximum allowed input−0.5 V to +5.5 V

Input impedance

10 kΩ, pull up to +3.3 V

Signal GND

Same potential as housing

3.2.5 External 10 MHz frequency reference input (10 MHz REF IN)
WF1973

WF1974

10MHz REF IN[Insulated from housing]

10MHz REF IN[Insulated from housing]

10 MHz REF IN can be used for the following purposes.
■ When frequency accuracy higher than the frequency accuracy specification of theequipment is required, or when the frequency reference of a different signal generator isdesiredInput the 10 MHz reference signal output from an external frequency standard or anothersignal generator.
Enable external frequency reference setting.
) “5. USING EXTERNAL FREQUENCY REFERENCE” in the Application Instruction
Manual■ To unify the frequency and phase for multiple WF1973, WF1974 units
Connect the frequency reference output of the master unit when multiple units are
combined in synchronous connection, or the master WF1973 or WF1974, to the external 10
MHz frequency reference input of the WF1973 or WF1974.
Set the frequency setting of each unit to the same value.
Also enable external frequency reference setting for the slave units and perform phasesynchronization with the master unit.
) “4. SYNCHRONIZING MULTIPLE UNITS” in the Application Instruction Manual
The frequency accuracies of the connected WF1973 and WF1974 units are all the same asthat of the master unit.
An external frequency standard can also be used for the master unit.
■ Input Characteristics
Input voltage

0.5 Vp-p to 5 Vp-p

Maximum allowed input

10 Vp-pInput impedance

1 kΩ, AC coupled

WF1973/WF1974

15

3. PANELS AND I/O TERMINALS

Input frequency

10 MHz (±0.5% (±50 kHz))

Input waveform

Sine or square (50 ±5% duty)

Signal GND

Insulated from housing and each channel waveform output (42 Vpk max.)

3.2.6 Frequency reference output (REF OUT)
WF1973

WF1974REF OUTREF OUT

Use REF OUT to unify the frequency and phase for multiple WF1973, WF1974 units.
Connect the frequency reference output of the master unit when multiple units are
combined in synchronous connection, or the master WF1973 or WF1974, to the external 10
MHz frequency reference input of the WF1973 or WF1974.
) “4. SYNCHRONIZING MULTIPLE UNITS” in the Application Instruction Manual■ Output Characteristics
Output voltage

1 Vp-p / 50 Ω

Output impedance

50 Ω, AC coupled

Output frequency

10 MHzOutput waveform

SquareSignal GND

Same potential as housing

Check
Do not connect any equipment other than the WF1973 and WF1974 notspecified by NF Corporation to the frequency reference output.
The special signal that is output from this terminal during synchronization may
make the operation of such connected equipment unstable.

3.2.7 Multi-I/O (MULTI I/O)
WF1973

WF1974

MULTI I/O

MULTI I/O

MULTI I/O can be used for sweep control and sequence control. It outputs the step
synchronization code for the sequence.

16

MULTIFUNCTION GENERATOR

3.2 I/O Terminals■ Control input for sweep oscillation mode
The following types of control for sweep oscillation can be done with 3-bit logic input.
) p. 94
Start

Start the sweep from the start through fall input.
ORed with external trigger input.

Stop

Stop the sweep through fall input.

Hold/resume

Hold the sweep through fall input during sweep execution.
The sweep is resumed from where it was held through rise input duringhold.

■ Control input for sequence oscillation mode
The following types of control for sequence oscillation can be done with 4-bit logic input.
) “6.2 Basics” in the Application Instruction ManualStart or state branchStart control and state branch control can be selected.
During start control, the sequence is started from the beginning throughfall input. ORed with external trigger input.
During state branch control, the sequence is branched to the specified
destination step through low level input upon step completion.

Stop

Stop the sequence through fall input.

Hold/resume

Hold the sequence through fall input during sequence execution.
The sequence is resumed from where it was held through rise input
during hold.

Event branch

The sequence is branched to the specified destination step through fall
input.

In the sequence oscillation mode, the 4-bit step synchronization code specified for each stepis output.

Check
When not using control input for multi-I/O connector, it is recommended todisable control input to prevent malfunction due to external noise.
) p. 94

Figure 3-5. Multi-I/O Connector Pin Assignment

10

5

1

15

11

6

Figure 3-5. Multi-I/O Connector Pin Assignment

WF1973/WF1974

17

3. PANELS AND I/O TERMINALS

Table 3-2. Multi-I/O Connector Function Allocation
Sequence Oscillation
Mode

Option Cable Color andMarking

Not used

Step sync code D0 (LSB)

Light brown Black ■OutputNot used

Step sync code D1

Light brown

3

OutputNot used

Step sync code D2

Yellow Black ■4

OutputNot used

Step sync code D3 (MSB)

Yellow5

OutputNot usedNot used

6

GND

–

–

7

GND

–

–

Gray Black ■

8

GND

–

–

Gray Red ■9

Reserved

10

GND

11

Input

12

Pin No.

I/O

1

Output2

Sweep Oscillation
Mode

Leave unconnected

Red ■Bright green Black ■Bright green

Leave unconnected

–

Red ■

Red ■

White Black ■–White Red ■Not used

Sequence event branchLight brown Black ■■Input

Sweep hold/resumeSequence hold/resume

Light brown

13

Input

Sweep stop

Sequence stop

Yellow Black ■■

14

Input

Sweep start

Sequence start or state
branchYellow

15

Input

Not usedNot used

Shell

–

–

Red ■■Red ■■

Bright green Black ■■–Bright green

Red ■■

Note: +5 V is output for testing purposes during production to pin No. 9. This pin is not designed foruse by users. Leave this pin unconnected, as its use may cause the operation of the equipment tobecome unstable.

■ I/O characteristics
Input voltage

TTL level (low: 0.8 V or lower; high: 2.6 V or higher)

Maximum allowed input−0.5 V to +5.5 V

Input impedance

10 kΩ, pull up to +5 V

Output voltage

TTL level (low: 0.4 V or lower; high: 2.7 V or higher)

Signal GND

Same potential as housing

Connector

Mini D-sub 15-pin

The connection cable is an option. Contact NF Corporation or an NF distributor for details.

18

MULTIFUNCTION GENERATOR

3.3 Cautions on Floating Ground Connection

3.3

Cautions on Floating Ground Connection
The signal ground of the BNC terminals for waveform output, sync/sub-output, and external
modulation/addition input, is shared, but since it is insulated from the housing (ground
potential), it can be connected to equipment that have a different potential. Moreover, thepotential has no influence even when the equipment is mounted in a rack.
In the WF1974, the above-mentioned BNC terminals are also insulated between channels.
Further, the signal ground of the external 10 MHz frequency reference input is also
insulated from the housing. Therefore, noise caused by ground-loop is not a problem forconnection with a frequency standard. Nor is noise caused by ground-loop a problem in thecase of synchronized connection of multiple units of the WF1973 or WF1974.
However, in all cases, the floating voltage should be limited to 42 Vpk (DC+AC peak) or
lower to prevent electric shocks.
The other signal grounds are all connected to the housing. The housing itself is connected toa protective grounding terminal.

WARNING To prevent electric shocks, do not apply a voltage exceeding 42 Vpk (DC+ACpeak) between the ground of the BNC connectors insulated from the housing
and the housing.
Also, do not apply a voltage exceeding 42 Vpk (DC+AC peak) between the
grounds of the BNC connector groups insulated from the housing. “BNC
connector group,” as used here, refers to multiple BNC connectors that areconnected to a common ground.
If such a voltage were to be applied, the internal voltage limiting elements will
try to curb the working voltage, but if the voltage is too large, equipment burnout
may result.

CAUTION

If there is a difference in potential between the ground of a BNC connector
insulated from the housing and the housing, do not short circuit the hot side ofthat BNC connector and the housing, as this may damage the equipment.

CAUTION

If a difference in potential exists between the grounds of the BNC connectors,
do not short circuit these BNC connector grounds, as this may damage theequipment.

WF1973/WF1974

19

3. PANELS AND I/O TERMINALS■ Cautions on Floating Ground Connection for WF1973
Figure 3-6. Cautions on Floating Ground Connection for WF1973

FCTN OUTANALOGCKTSYNC/SUB OUT
MOD/ADD IN
Use with potential
difference of 42 Vpk
or less!

1 MΩ

Use with potential
difference of 42 Vpk
or less!

Housing ground

10 MHzREF IN

EXT
REF
CKT

Use with potential
1 MΩ
difference of 42 Vpk
or less!
Housing groundFigure 3-6. Cautions on Floating Ground Connection for WF1973■ Cautions on Floating Ground Connection for WF1974
Figure 3-7. Cautions on Floating Ground Connection for WF1974

FCTN OUTCH1
ANALOGCKTFCTN OUTSYNC/SUB OUTCH2ANALOGCKT

MOD/ADD IN
Use with potential
difference of
42 Vpk or less!

SYNC/SUB OUT
MOD/ADD IN
Use with potential
difference of
42 Vpk or less!

Use with potential
1 MΩ
difference of
Housing ground
Housing ground
42 Vpkor less! Use with potential
Use with potential
difference of 42 Vpk
difference of 42 Vpk
or less!
or less!

1 MΩ

10 MHzREF IN

EXT
REF
CKT

Use with potential
1 MΩ
difference of 42 Vpk
or less!
Housing groundFigure 3-7. Cautions on Floating Ground Connection for WF197420

MULTIFUNCTION GENERATOR

4.
4.1

BASIC OPERATIONPower on/off Switching and Restoration of Settings

4.1.1 Power on/off switching method■ Power-on procedure
The startup screen is displayed

Power off state(standby state)

Press thepower switch.

The power is switched on.

Once the power is switched on, a self-check test is automatically executed and the unit
becomes operable.

■ Power-off procedure
The display goes off.

Power on state

WF1973/WF1974

Press thepower switch.

The power is switched off(standby state)21

4. BASIC OPERATION

4.1.2 Restoration of settings at power-on
When the power is switched on/off with the power switch, the settings before the previous
time the power was switched off are restored when the power is switched on again.
The output on/off settings at power-on can be set on the Utility screen. ) p. 41
However, if the power supply to the equipment is directly cut off while the equipment's
power is on, the settings are set to the contents of setting memory 1 when the equipment is
powered on again.

a) Restoration of settings when power switch is switched on/off while power supply
is connected
The most general case is illustrated below.

㨪LINE

㨪LINE

Power supply connected

Power supply connected

Settings
AAA

1
Press the power switch.

Power on state

The power is switched off(standby state)

㨪LINE
㨪LINE

Even if thepower supply is
disconnected in
the power off
state, this has
no influence on
the next restore
operation.

1

Power supply disconnected

Power supply
reconnected
2

The power remains off

The power remains off(standby state)

㨪LINEPower supply connected
Settings
AAA

2
Press the power switch.

The power is switched on(former settings are restored)

While the equipment power is off, even if the power supply is cut off due to the disconnection of
the cord or the shutoff of a connected breaker, this has no influence on the restore operation
the next time the equipment is powered on again.

22

MULTIFUNCTION GENERATOR

4.1 Power on/off Switching and Restoration of Settings•The settings before the equipment was powered off last are restored.
•The output on/off settings at power-on can be set on the Utility screen. ) p. 41

Check
The previous settings can be restored only if the equipment was powered off
using the power switch.

WF1973/WF1974

23

4. BASIC OPERATIONb) Restoration of settings during power supply on/off
This applies to switching the power supply on/off at one time for this equipment and otherembedded devices when this equipment is mounted in a rack.
When the power supply is cut off while the equipment power is on, the equipment power
automatically goes on the next time the power supply is reconnected.

㨪LINE
㨪LINE
Power supply connected

Power supply disconnected

Settings
AAA

1

Power on state

The power is switched off.

㨪LINE

㨪LINE
Power supply reconnected

1Power supply connected
Settings
BBB

Settings
MMM
The power is switched on.
(The settings are set to thecontents of setting memory 1.)

Setting change
procedure

2Power on state

㨪LINE
㨪LINE
Power supply disconnected

Power supply reconnected
Settings
MMM

2

The power is switched off.

The power is switched on.
(The settings are set to thecontents of setting memory 1.)• The settings before the power is switched off cannot be restored.
• The contents of setting memory number 1 are set. ) p. 122• The output on/off settings at power-on can be set on the Utility screen. ) p. 41

Check
Since the settings before the power supply is cut off are not restored, specify
the contents of setting memory number 1 beforehand if required. ) p. 122

24

MULTIFUNCTION GENERATOR

4.2 Screen Configuration and Operation

4.2

Screen Configuration and Operation

4.2.1 Screen configuration
The screen consists of three areas, as shown in the following figure.
Status display area

Setting area

Display format
switching tabs
Soft key display area

■ Status display area
Displays the status of the equipment.
The following items are displayed.
• Uncalibrated status UCal
Displayed when the calibration information of the equipment is lost due to a problem, andthe prescribed performance cannot be maintained. Since this is a malfunction, notify NF
Corporation or an NF distributor.
• Overheating status Temp
Displayed when the internal temperature of the equipment becomes abnormally high.
When this status is displayed during use at an ambient temperature of 40°C or lower, thisindicates a malfunction, so notify NF Corporation or an NF distributor.
• Remote status USB ， GPIB
Displayed when the equipment is controlled via the USB or GPIB interface.
• External frequency reference status Ref
Displays whether a valid signal is input or not, when the external frequency reference isenabled.
• Sequence status/channel mode (WF1974 only)
The status when the sequence oscillation mode is selected is displayed.
In the WF1974, the mode when the channel mode is other than independent (2-phase,
constant frequency difference, constant frequency ratio, and differential output).
• 2-channel same value (Both) setting (WF1974 only) Both
Displayed when the same setting is done for CH1 and CH2.
Remote status
Overheating status
Uncalibrated status

WF1973/WF1974

External frequency reference status
Sequence status/
2-channel
channel modesame value (WF1974 only)
setting(WF1974 only)25

4. BASIC OPERATION■ Setting area
This area is used to display and set the various parameters.
When multiple display formats can be selected, display format switch tabs are displayed on
the left side of the screen. ) p. 27
Due to the large number of setting parameters in the case ofmodulation, sweep, and burst oscillation, the setting screen
consists of two or three pages. The screen pages can be switchedwith the NEXT key.

ME

NEXT

Setting screen page position
display icon

Switching setting
screen pages with
the NEXT key

When there are several setting screen pages, an icon
indicating which page is displayed appears at the top center of the screen.
In the example on the left, there is a total of two setting
screen pages, and the icon indicates that the second page iscurrently displayed.

Indicates that there are several
setting screen pages, which canbe switched with the NEXT key.

■ Soft key display area
Displays the functions of the soft keys allocated according to the status.
If five or more soft keys are allocated, “ ▼ n/m” is displayed over the right-most soft key. This
indicates that the set of soft keys belonging to the current setting screen extends of mstages, and that the set corresponding to the nth stage is currently displayed. When the soft
key over which “ ▼ n/m” is displayed is pressed, the next set of soft keys is displayed.
Start

26

StartStٕ

Indicates that the first of twostages of soft keys isdisplayed.
When this key is pressed, thenext stage of soft keys isdisplayed.

MULTIFUNCTION GENERATOR

4.2 Screen Configuration and Operation

4.2.2 Switching display format with tabs (displaying waveform graph)
When a number of display formats can be selected, a display format switching tab isdisplayed on the left side of the screen. When the Graph tab is displayed on the screen,
settings can be performed while checking the image of the output waveform.

a) Display format types
There are three types of display formats, as follows.
■ Text display [Text] (WF1973)■ Graph display [Graph]or [Single](WF1974)
Displays the settings of one channel in both
Displays the settings of 1 channel intext form.

text and graph form, allowing the image of theoutput waveform to be checked.

■ 2-channel simultaneous display [Dual] (WF1974 only)
Displays the settings of channel 1 and channel 2 in text form vertically superposed.
The channel to be set can be switched with theCH1/CH2 key.

WF1973/WF1974

27

4. BASIC OPERATIONb) Switching the display format

1. In the example on the left, the Text tab
The Text tab
screen isdisplayed.

screen is displayed.
On this screen, the settings are displayedin text form.

2. Select the Graph tab with the arrow keys
or the modify knob.
Tab selection
The Graph tab isselected.

or

3. The Graph tab screen display is switched

The Graph tab
screen isdisplayed.

to by pressing the ENTER key. The
settings can be done while checking theimage of the output waveform on thisscreen.
ENTER

Check
In the WF1974, display can be switched between 1-channel display and 2channel simultaneous display.

28

MULTIFUNCTION GENERATOR

4.2 Screen Configuration and Operation

4.2.3 Top menu
Sequence oscillation, arbitrary waveform editing, system settings, saving and recalling
settings, and other actions are done by selecting the desired item from the top menu.

a) Displaying the top menu
Press the MENU menu key to display the following top menu window.
The top menu window opens.
FCTN

FREQ

AMPTD

OFFSET

MENU

Select the desired menu item using theup/down arrow keys or themodify knob,
and then press the ENTER ENTER key to display the menu item setting screen.
With the top menu window open, the desired menu item can also be specified by inputting a
number using the 0 ... 9

numeric keypad.

If the display contents are invisible for the backlight out, press on the MENU menu key for awhile to light up the backlight forcibly.

b) Actions possible using the top menu items
The menu items are displayed at the top left of each setting screen.
Settings and operations such as those described below can be done with the various menu items.
Menu item■ Oscillator
Almost all settings other than arbitrary waveform editing
and sequence oscillation can be set and manipulated.
When the power is applied, the Oscillator setting screen isalways displayed.
■ Sequence
Sequence oscillation setting and manipulation can be
done. ) “6. USING SEQUENCE OSCILLATON” in the
Application Instruction Manual■ ARB edit
Arbitrary waveform editing can be done. ) “2. CREATING ARBITRARY WAVEFORMS” in
the Application Instruction Manual■ Utility
Various settings and manipulations can be done. ) p. 39■ Store memory
The settings can be saved to the setting memory. ) p. 122■ Recall memory
The settings can be called from the setting memory. ) p. 124

WF1973/WF1974

29

4. BASIC OPERATION

4.3

Basic Settings and Operations

4.3.1 Changing the frequency, amplitude, and other valuesa) Changing a value with theup/down arrow keys or themodify knob

1. Select the desired item with the arrow
keys or the modify knob.
In the example on the left, the [Freq]
frequency field is selected.
The frequency is
selected.
The current
frequency isdisplayed.

Item selection

or

2. Press the ENTER key. The input field

The input field is
opened.

below the selected item opens and theselected item status changes so that thecurrent value can be changed.
In this state, a value can also be input by
using the numeric keypad.
ENTER

3. Press the left/right arrow keys to move thecursor to the digit of the value to bechanged.
In the example on the left, the cursor is
moved to the 1 kHz digit.
The digit to bechanged is the 1
kHz digit.

Cursor movement

4. Increment or decrement the value of the

The value of thechanged digit is
now 2.

digit to be changed with the up/downarrow keys or the modify knob.
In the example on the left, the value ischanged to 2 kHz.
The change is instantly reflected to the
output.
Value incrementing/decrementing
or

30

MULTIFUNCTION GENERATOR

4.3 Basic Settings and Operations

5. Press the ENTER key to close the input
field.
ENTER

The input field
has closed.
If the CANCEL key is pressed instead of the ENTER
key, the value changed with the modify knob is
discarded and the status of step 1 (pre-change
setting) is returned to.

b) Changing a value with the 0 ... 9 numeric keypad

1. Select the desired item with the arrow
keys or the modify knob.
In the example on the left, the [Freq](frequency) field is selected.
The frequency is
selected.
The current
frequency isdisplayed.

Item selection

or

2. Press a key of the numeric keypad. The

The input field
opens and avalue is input.

input field under the selected item opens
and the numeric value is input.
In the example on the left, “2” is input.
During numeric input, the left arrow key
serves as the delete key, and the rightarrow key as the zero input key.
Numeric input
7

8

9

4

5

6

1

2

3

0

.

3. Press the ENTER key or the unit key (softThe setting ischanged and the
input field closes.

key) to set the input value and reflect it tothe output. The input field closes.
If the ENTER key is pressed, the setting is
performed in a unit without the “k” or “m”
prefix.
ENTER

orIf the CANCEL key is pressed instead of the ENTER
key, the input value is discarded and the setting
remains unchanged.

Check
During numeric input, the left arrow key serves as the delete key, and the rightarrow key as the zero input key.

WF1973/WF1974

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4. BASIC OPERATION

Check
If a setting item is displayed on a soft key, the input field for that item can be
opened by pressing that soft key.

32

MULTIFUNCTION GENERATOR

4.3 Basic Settings and Operations

4.3.2 Changing the waveform and oscillation mode

1. Select the desired item with the arrow

The waveform isselected.
The current
waveform isdisplayed.

keys or the modify knob.
In the example on the left, the [Fctn](waveform) field is selected.
Item selection

or

2. Press the ENTER key to open the list of
choices.
ENTER

The choice list
opens.

3. Scroll the choice list with the up/downarrow keys or the modify knob.
In this state, the desired item can also be
selected by inputting a number from thenumeric keypad.
“Ramp” isselected.

Item selection

or

4. Press the ENTER key to set the selected
item and reflect it to the output. The list of
choices closes.
The setting ischanged and the
choice list closes.

ENTER

If the CANCEL key is pressed instead of the ENTER
key, the setting remains unchanged and the statusof step 1 is returned to.

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4. BASIC OPERATION

4.3.3 Manipulating shortcut keys for changing basic parameters
The choice list or input field for waveform, frequency, amplitude, and DC offset can be
immediately opened with the corresponding basic parameter shortcut key.
■ Waveform) p. 44
The waveform choice list
opens.

FCTN

FREQ

AMPTD

OFFSET

MENU■ Frequency) p. 44
The frequency input field
opens.

FCTN

FREQ

AMPTD

OFFSET

MENU■ Amplitude) p. 48
The amplitude input field
opens.

FCTN

FREQ

AMPTD

OFFSET

MENU■ DC offset) p. 50
The DC offset input field
opens.

FCTN

FREQ

AMPTD

OFFSETMENU

34

MULTIFUNCTION GENERATOR

4.3 Basic Settings and Operations

4.3.4 Operations of ENTER key, CANCEL key, and UNDO key■ ENTER key operation
The ENTER key can be used to perform the following actions.
・Open the input field or choice list for the selected item
・Set the value input from the numeric keypad
・Perform the function of the button displayed on the screen■ CANCEL key operation
The CANCEL key can be used to perform the following cancellation
actions. However, once a setting has been changed, the original
setting cannot be returned to (this can be done with the UNDO key
described next).

CANCEL

ENTER

・Close an input field or choice list
・Discard a value input from the numeric keypad

UNDO

・Return a changed value to the original value with the modify knob
・Close the setting window or dialog box■ UNDO key operation
The UNDO key can be used to restore the settings changed by using
the ENTER key or the modify knob. Changes to settings that havebeen automatically executed as the result of the user's
manipulations can also be restored to the original settings.
When the UNDO key is pressed again immediately following undo
manipulation, the settings are restored to their state before undo.
It should be noted, however, that undo does not work for someitems.

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35

4. BASIC OPERATION

4.3.5 Changing the display unita) Changing the prefix (unit prefix: k, m, M, etc.)
Frequency is used as an example below. The amplitude and pulse width can be changed in asimilar manner.

1. Select frequency and then press the
ENTER key to open the input field.
ENTER

The input field
opens.

2. Press the [Prefix] soft key and the cursor
will move to before “Hz”.
The right arrow key can also be used tomove the cursor to before “Hz”.
The cursor
moves to before“Hz” when[Prefix] ispressed.

3. Change the unit to MHz, kHz, Hz, mHz, or uHz with theUnit change

up/down arrow keys or the modify knob. Even when thedisplay unit and decimal point position are changed, thevalue of the setting itself remains unchanged.

kHz display

36or

MHz display

MULTIFUNCTION GENERATOR

4.3 Basic Settings and Operationsb) Changing Vp-p, Vrms, user-defined unit, etc.
Amplitude is used as an example below. The frequency and pulse width can be changed in asimilar manner.

1. Select amplitude and then press the
ENTER key to open the input field.
ENTER

The input field
opens.

2. Press the [Unit] soft key and the cursor will
move to “Vp-p”.
The right arrow key can also be used tomove the cursor to “Vp-p”.

The cursor
moves to “Vp-p”
when [Unit] ispressed.

3. The unit can be changed to Vrms, dBV, or a userdefined unit with the up/down arrow keys or the modify
knob (in the case of sine wave, load impedance HighZ). Even when the display unit is changed, the output
value remains unchanged.

Vrms display

Unit changeordBV display

Also refer to the following sections:• Changing the frequency and period settings ) p. 45.
• Changing the amplitude unit (Vp-p, Vpk, Vrms, dBm, dBV) ) p. 48.
• Changing the pulse width time and duty settings ) p. 61.
• Setting the user-defined unit ) “7. USING USER-DEFINED UNITS” in the Application
Instruction Manual

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37

4. BASIC OPERATION

4.3.6 CH1/CH2 switching key and active channel (WF1974 only)
The channel to be set is switched each time the CH1/CH2 switchingkey is pressed.

MENU

This key is invalid in setting screens that are channel independent.

FCTN OU
CH 1/CH 2

The channel that is to be set is called the “active channel” in this
MAN TRIG

product. In the burst oscillation mode, etc., theMAN TRIG key
works for the active channel. Even if the screen is changed to achannel independent screen, the channel that was active up to thatpoint is saved.
CH1 active(CH1 = channel to be set)

NEXT
±10V
Zout 50Ω

CH1/CH2
switching key

CH2 active(CH2 = channel to be set)

CH 1/CH 2

CH 1/CH 2

38

MULTIFUNCTION GENERATOR

4.3 Basic Settings and Operations

4.3.7 Actions possible in the Utility screena) Displaying the Utility screen

Select [Utility] inthe top menu andpress the ENTER
key

The top menu window is displayed bypressing the MENU MENU key. In thiswindow, select [Utility] and then press the
ENTER
ENTER key to display the Utility
screen.

b) Utility screen configuration
Setting initialization
External addition setting
Power-on output setting

External 10 MHz frequency
reference enable/disable
External 10 MHz frequency
reference input status display

User-defined unit setting
Display setting

Phase synchronization

Operation sound setting

Modify direction setting

Internal information display
Channel mode setting(WF1974 only)
2-channel same value setting On/Off(WF1974 only)

Remote setting
Self check
Inter-channel
parameter copy
(WF1974 only)

Setting initialization [Reset]
Initializes the settings. The initial settings are continuous oscillation, sine wave, 1 kHz, 0.1
Vp-p/open, and output off. ) p. 41
External 10 MHz frequency reference enable/disable [Ext Reference]
Enables/disables the external 10 MHz frequency reference. ) “5. USING EXTERNALFREQUENCY REFERENCE” in the Application Instruction Manual
External addition setting [Ext Add]
Sets external addition gain. The setting can be selected from off, ×2, and ×10. ) p. 57
External 10 MHz frequency reference input status display [10MHz Ref In]
Displays whether a valid signal for external 10 MHz frequency reference input is available.
) “5. USING EXTERNAL FREQUENCY REFERENCE” in the Application Instruction
ManualPower-on output setting [Power-On Output]
Sets the output on/off setting at power-on. ) p. 41
Phase synchronization[φ Sync]
Performs inter-unit synchronization during multiple unit synchronization connection andinter-channel synchronization of the WF1974.
) “3.3 Phase Synchronization Between Channels” and “4. SYNCHRONIZING MULTIPLE
UNITS” in the Application Instruction Manual.
User-defined unit setting [User Unit]
Sets user-defined units. ) “7. USING USER-DEFINED UNITS” in the Application
Instruction Manual.

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4. BASIC OPERATION

Remote setting [Remote]
Selects GPIB/USB and sets the GPIB address. The USB ID is also displayed. ) “8.1Selecting Remote Interface [Remote]” in the Application Instruction Manual.
Display setting [Display]
Sets the backlight of the display. ) “8.2 Display Settings [Display]” in the Application
Instruction Manual.
If the display contents are invisible for the backlight out, press on the MENU MENU key for awhile to light up the backlight forcibly.
Modify direction setting [Modify Direction]
Sets the movement direction when the modify knob is turned. ) “8.3 Modify Knob andModify Direction Setting [Modify Direction]” in the Application Instruction Manual.
Operation sound setting [Sound]
Sets the operation sound. ) “8.4 Operation Sound Setting [Sound]” in the Application
Instruction Manual.
Self-check [Self Check]
Performs internal status check. ) “8.5 Self Check [Self Check]” in the Application
Instruction Manual.
Internal information display [Information]
Displays the firmware version and latest calibration date. ) “8.6 Product Information
Display [Information]” in the Application Instruction Manual.
Channel mode setting [Channel Mode] (WF1974 only)
Sets the type of 2-channel ganged operation. Independent, 2-phase, constant frequency
difference, constant frequency ratio, and differential output can be selected from. ) “3.4
Maintaining Both Channels to Same Frequency (2-Channel Ganged Operation, 2-Phase)”,“3.5 Keeping Frequency Difference Constant (2-Channel Ganged Operation, 2-Tone)”, “3.6
Keeping Frequency Ratio Constant (2-Channel Ganged Operation, Ratio)”, and “3.7Obtaining Differential Output (2-Channel Ganged Operation, Differential)” in the
Application Instruction Manual.
Inter-channel parameter copy [Parameter Copy] (WF1974 only)
Copies the settings between channels. ) “3.1 Copying Settings Between Channels” in the
Application Instruction Manual.
2-channel same value setting On/Off [Both] (WF1974 only)
Switches on/off setting of the same value for both channels. ) “3.2 Unifying Settings of 2
Channels” in the Application Instruction Manual.

40

MULTIFUNCTION GENERATOR

4.3 Basic Settings and Operations

4.3.8 Restoring the initial settings
The initial settings can be restored from the Utility screen.
The initial settings that are restored consist of continuous oscillation, sine wave, 1 kHz, 0.1
Vp-p/open, and output off.
For a list of the initial settings, ) p. 126.

1. Press the MENU MENU key to display the
top menu window. In that window, select[Utility] and then press the ENTER ENTER
key to display the Utility screen.

In the top menu,
select [Utility] andthen press the
ENTER key.

2. On the Utility screen, select the [Reset]
field and then press the ENTER ENTER key.
The settings are initialized.
On the Utility
screen, select[Reset] and thenpress the ENTER
key.

4.3.9 Output on/offa) Manipulation method on panel
Each time the waveform output on/off key is pressed, the waveform
output is switched on/off. When the output is on, the lamp located to
the left of the key lights.

OUT

FCTN OUTSYNC/SUB OUT

CH 1
42Vpk

Output off

Output on

OUT

Output on/off key

OUT
OUT

When the output is off, the output terminal is open. When the output is on, the output
impedance is 50 Ω. Sync/sub output is always on regardless of the on/off setting of the
waveform output.

b) Setting at power-on
The waveform output on/off status at power-on can be specified.
The output setting at power-on can be selected from the following three.
• Off [Off]The output is off.
• On [On]The output is on.

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41

4. BASIC OPERATION• Return to previous setting [Last State]
The operation differs as follows according to the method used the previous time to set
the power off.
If the power was switched off the previous time with the power switch on the panel
The settings before the power was switched off are restored.
If the power was switched off the previous time by cutting off the power supply
The output is off.
This is the case when the equipment is mounted along with other devices on arack and the power supply to all the units is switched on/off at the same time.
The operation is done on the Utility screen.

In the top menu,
select [Utility] andthen press the
ENTER key.

1. Press the MENU MENU key to display the
top menu window. In this window, select[Utility] and then press the ENTER ENTER
key to display the Utility screen.

2. On the Utility screen, select the [PowerOn Output] field and then press the ENTER
ENTER key.
On the Utility
screen, select[Power-On
Output] and thenpress the ENTER
key.
The power-on
output setting
window isdisplayed.

3. The power-on output setting window isdisplayed, so select the desired item andthen press the ENTER ENTER key.
The output setting condition choice list isdisplayed, so select the desired item andthen press the ENTER ENTER key.

Set the output
setting condition.

4. Once the desired power-on output setting

Select [OK] andthen press the
ENTER key.

42

has been completed, select [OK] in thelower part of the window and then press
the ENTER ENTER key. The power-on
output setting change is applied and thewindow closes.
To not apply the power-on output settingchange, select [Cancel] in the lower part of
the window and then press the ENTER
ENTER key, or press the CANCEL CANCEL
key.

MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Items

4.4

Setting Methods for Main Items
This section describes the setting methods for the main items, mainly done on the Oscillator
setting screen. “Oscillator” is displayed at the top left of the Oscillator setting screen. Whenanother screen is displayed, pressing the MENU MENU key displays the top menu, so select[Oscillator] and then press the ENTER ENTER key.
The following explanation uses the text display screen (1 channel display) in the continuous
oscillation mode. The setting screen consists of one page only.

4.4.1 Configuration of text display screen in continuous oscillation modeThis screen is where the basic settings for the output waveform are done.
Waveform
Oscillation mode

Polarity and amplitude
range of waveform(depending on the
waveform, additional
selection buttons may
be displayed)

Frequency
Amplitude
DC offset
Phase

Waveform-specific parameters

4.4.2 Setting the oscillation mode

1. Select the [Mode] field and then press the
ENTER key to display the oscillation
mode choice list.
Even if there are several setting screens,the [Mode] field is displayed at the top leftof each page.
ENTER

Oscillation
mode choice list

2. Select the desired oscillation mode from the choice list and then press the ENTER ENTER
key to apply the setting and reflect it to the output.
The desired oscillation mode can also be set and reflected to the output by inputting thenumber of the desired oscillation mode displayed in the choice list from the numeric
keypad.
The oscillation mode can also be set by inputting a number from the numeric keypad
while the [Mode] field is selected (without the choice list displayed).

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43

4. BASIC OPERATION

4.4.3 Setting the waveform

1. Press the

FCTN
FCTN shortcut key todisplay the waveform choice list.
Alternatively, select the [Fctn] field andpress the ENTER ENTER key to open the
choice list.
Even if there are several setting screens,the [Fctn] field is always displayed at the
top right of the first page.

Waveformchoice list

2. Select the desired waveform from the choice list and then press the ENTER ENTER key toapply the setting and reflect it to the output.
The desired waveform can also be set and reflected to the output by inputting the numberof the desired waveform displayed in the choice list from the numeric keypad.
The desired waveform can also be set by inputting a number from the numeric keypad
while the [Fctn] field is selected (without the choice list displayed).

4.4.4 Setting the frequency

1. Press theFrequency
input field

FREQ
FREQ shortcut key todisplay the frequency input field, or selectthe [Freq] field and then press the ENTER
ENTER key to open the input field.
Even if there are several setting screens,the [Freq] field is always displayed at the
top left of the first page.
When [Period] is displayed in the [Freq]
field and the period and not the frequency
is displayed, either press the FREQ FREQ
key or press the [Freq] soft key, to switch
to the frequency display.

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or one of the unit keys (soft keys: [uHz] [mHz] [Hz] [kHz] [MHz]) to set
the input value and reflect it to the output. If the ENTER key is used, the unit is set to Hz.

44

MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Items

4.4.5 Performing setting with period
Settings can be performed using the period instead of the frequency.
The frequency display can be changed to the period display with one of the following two
methods.
○ Changing to period display with [Freq] / [Period] soft key
When the frequency input field is open and the current frequency is displayed, the[Period] soft key is displayed. Press this key to open the period input field and change theitem display from [Freq] to [Period].
The [Period] soft key changes to [Freq]. When the [Freq] key is pressed, the frequency
input field opens again.
○ Changing to period display by pressing the FREQ FREQ key twice
While the frequency input field is not open, press the FREQ FREQ shortcut key twice toopen the period input field.
When either the frequency or period input field is open, the frequency display and period
display are toggled each time the FREQ FREQ key is pressed.
Once the period input field is opened, thesetting procedure is the same as for thefrequency.
When a value is input with the numeric
keypad, the unit key for period setting isdisplayed as a soft key.

Period input
field

When period display is changed to, thedisplay changes as follows.
Item name: Freq

→ Period

Unit display: Hz→ sSoft key:

Period → Freq

4.4.6 Setting the phasea) Setting method

1. Select the [Phase] field and then press thePhase input
field

ENTER ENTER key to open the phase input
field.
Even if there are several setting screens,the [Phase] field is always displayed on
the first page.

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or the [deg] unit key (soft key) to set the input value and reflect it to the
output. If the ENTER key is used, the unit is also set to deg.

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45

4. BASIC OPERATIONb) Items that can be changed in the phase setting
The following items can be changed with the phase setting.
■ The phase difference between the sync/sub-output’s reference phase sync output andwaveform output can be changed
The following example assumes a phase setting of +90°. At this time, the waveform output’s
zero phase position is 90° ahead of the rise of the reference phase sync output.

Phase setting: +90°
Waveform output

Waveform output’s
zero phase position

Sync/sub-output(reference phase sync output)

90°■ The oscillation start/stop phase for burst oscillation, gated single-shot sweep can bechangedThe following example is burst oscillation with the oscillation start/stop phase set to +30°.
At this time, the oscillation starts at +30° and stops at the same +30° position.
Burst oscillation: ) p. 105, gated single-shot sweep: ) p. 89.
Phase setting: +30°

Oscillation
start at +30°

46

Oscillation
stop at +30°

MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Items■ The phase difference between channels during sync oscillation and 2-phase oscillation
can be changed (WF1974 only)
The difference between the phase setting of each channel is the phase difference between
channels.
If [CH2 phase setting − CH1 phase setting] is positive, the waveform of CH2 is ahead of the
waveform of CH1, as shown in the following figure.
For details on sync oscillation and 2-phase oscillation, ) “3.3 Phase Synchronization
Between Channels” and “3.4 Maintaining Both Channels to Same Frequency (2-Channel
Ganged Operation, 2-Phase)” in the Application Instruction Manual.

CH1 waveform output

CH2 waveform output

CH2 phase setting –CH1 phase setting

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47

4. BASIC OPERATION

4.4.7 Setting the amplitudea) Setting method

1. Press the AMPTD AMPTD shortcut key toopentheamplitude
input
field.
Alternatively, select the [Amptd] field andthen press the ENTER ENTER key to open
the amplitude input field.
Even if there are several setting screens,the [Amptd] field is always displayed on
the first page. If [High] is displayed in the[Amptd] field and the high level instead of
the amplitude is displayed, press the AMPTD
AMPTD key once more to switch to theamplitude display.

Amplitude input
field

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or one of the unit keys (soft keys) to set the input value and reflect it tothe output.

b) Changing the unit (Vp-p, Vpk, Vrms, dBV, dBm, user-defined unit)

1. When the amplitude input field is open,press the [Unit] soft key and move thecursor to the unit position on the right end.
Place cursor onunit

2. The unit can be changed with theup/down arrow keys or themodifyknob. (Units that cannot be used are notdisplayed.) Even if the display unit ischanged, the actual output value remains
unchanged.

c) The units that can be used differ according to the waveform
Vp-p, Vpk, Vrms, dBV, dBm, and user-defined units can be used as the amplitude units.
However, the applicable waveforms are limited as follows (not applicable to DC).
Unit
Vp-p

Standard waveform and arbitrary waveform with amplitude range of ±FS

Vpk

Standard waveform and arbitrary waveform with amplitude range of 0/+FS, −FS/0

Vrms

Sine wave and noisedBV

Sine wave and noise
1 Vrms = 0 dBV

dBm

Sine wave and noise
Voltage of 1 mW set as 0 dBm for the specified load impedance（) p. 55）
Example: In the case of a load impedance setting of 50 Ω, 0 dBm = 223.6 mVrms/50 Ω.
Not usable when the load impedance setting is High-Z.

User-defined
unit

48

Applicable Waveform

All waveforms.

For details on user-defined waveforms, ) “7. USING USER-DEFINEDUNITS” in the Application Instruction Manual.

MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Itemsd) AC+DC limitation
The maximum value for [AC amplitude + DC offset] is limited to ±10 V/open.
For example, if the AC amplitude is 5 Vp-p/open, the DC offset range is limited to the range
from −7.5 V/open to +7.5 V/open.
The maximum value varies according to the output voltage range setting and the external
addition input setting.
) p. 54, p. 57

WF1973/WF1974

49

4. BASIC OPERATION

4.4.8 Setting DC offseta) Setting method

1. Press the OFFSET OFFSET shortcut key to

DC offset input
field

open the DC offset input field.
Alternatively, select the [Offset] field andthen press the ENTER ENTER key to open
the DC offset input field.
Even if there are several setting screens,the [Offset] field is always displayed on thefirst page.
If [Low] is displayed in the [Offset] field
and the low level instead of the offset isdisplayed, press the OFFSET OFFSET key
once more to switch to the DC offset
display.

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or one of the unit keys (soft keys) to set the input value and reflect it tothe output.

b) AC+DC limitation
The maximum value for [AC amplitude + DC offset] is limited to ±10 V/open.
For example, if the AC amplitude is 5 Vp-p/open, the DC offset range is limited to the range
from −7.5 V/open to +7.5 V/open.
The maximum value varies according to the output voltage range setting and the external
addition input setting.
) p. 54, p. 57

50

MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Items

4.4.9 Setting the output level with high level/low level
The output level can be set by specifying the high level and low level of the waveform,
instead of setting the amplitude and DC offset.

a) Changing the amplitude/DC offset display to high/low display
There are three methods for changing the amplitude/DC offset display to high/low display,described below.
○ Changing to high/low display with the [High] or [Low] soft key
When the amplitude or DC offset input field is open and the current value is displayed,
the [High] or [Low] soft key is displayed. By pressing this key, the high level or low level
input field opens, and the item displays change from [Amptd] and [Offset] to [High] and[Low], respectively.
The [High] or [Low] soft key changes to [Amptd] or [Offset]. When the [Amptd] or [Offset]
soft key is pressed at this time, the amplitude or DC offset input field opens.
○ Changing to high/low display by pressing the AMPTD AMPTD key twice
While the amplitude input field is not opened, press the AMPTD AMPTD shortcut key twice
to open the high level input field.
If the high level input field is open, the amplitude/DC offset display and high/low display
are toggled each time the AMPTD AMPTD key is pressed.
○ Changing to high/low display by pressing the OFFSET OFFSET key twice
While the DC offset input field is not open, press the OFFSET OFFSET shortcut key twice toopen the low level input field.
If the low level input field is open, the amplitude/DC offset display and high/low display
are toggled each time the OFFSET OFFSET key is pressed.

High level input field

Low level input field

Once the high level or low level field is open, the setting procedure is the same as for DC
offset.
When a numeric value is input from the numeric keypad, the high level/low level setting
unit is displayed on a soft key.
The display changes as follows when the high level/low level display is switched to.
Item name:

Amptd

→

High,

Offset →Unit display: Vp-p, Vpk, Vrms, dBV, dBm, V
Soft key:

High→

Amptd, Low

→

Low
→

V

Offsetb) AC+DC limitation
The high level and low level are limited to the range of −10 V to + 10 V/open.
The maximum range varies according to the output voltage range setting and the external

WF1973/WF1974

51

4. BASIC OPERATION

addition input setting.
) p. 54, p. 57

4.4.10 Setting the waveform polarity and amplitude rangea) Setting method
Select thepolarity/amplitude
range icon andthen press the
ENTER key
The current
polarity/amplitude
range is displayedwhen the polarity/
amplitude range
icon is selected.

1. Select the polarity/amplitude range icon to
the right of the waveform name to display
the current polarity/amplitude range
settings under that icon.
Press the ENTER ENTER key to open thepolarity/amplitude range choice list.

2. Select the desired polarity and amplitude
range from the choice list and then press
the ENTER ENTER key to set the input
values and reflect them to the output.
Alternatively,
input
the
numbers
corresponding to the desired polarity andamplitude range displayed in the choicelist from the numeric keypad to set thesevalues and reflect them to the output.

Polarity andamplitude range
choice listb) What are the polarity and amplitude range?
The polarity can be inverted and the amplitude range can be changed to a single polarity foreach waveform. Examples for a sine wave are shown below.
Polarity

Amplitude Range
±FS

−FS/0

0/+FS

+FS
Normal[Norm]

0

+FS

0
-FS

-FS

0

+FS
Inverted
[Inv]

0

+FS
0
-FS

0
-FS

In the case of polarity inversion, only the waveform is inverted, and the DC offset sign of theoutput remains unchanged.

Check
The polarity and amplitude range settings are done independently for eachwaveform.

52

MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Itemsc) Amplitude range determination method
Determine the amplitude range by observing how the waveform changes when theamplitude is changed.
Under the initial settings, the waveform oscillating between the two polarities is set to ±FS,
while the unipolar waveform is set to 0/+FS.
■ Example when amplitude range is ±FS for sine wave

Amplitude change

When the amplitude is changed, the waveform amplitude changes
in a +/– symmetric manner with the DC offset position as
reference.
Normally, in the case of a waveform that oscillates between thetwo polarities with zero as the center, it is convenient to set the0
amplitude range to ±FS.

DC offset

Amplitudechange■ Example of Gaussian pulse with amplitude range of 0/+FS
When the amplitude is changed, only the waveform amplitude ischanged at the peak on the positive side, using the DC offset
position as reference. The amplitude is changed using the bottomof the waveform as reference. Normally, in the case of a unipolar
waveform, it is convenient to set the amplitude range to 0/+FS or0−FS/0.

DC offset

If the amplitude range is set to −FS/0, the amplitude changes
using the top of the waveform as reference.
(Gaussian pulse is a waveform that is included in parameter-variable waveforms.)d) Limitation through amplitude range• If the amplitude range is −FS/0 or 0/+FS, the maximum amplitude is one half of ±FS.
• If the amplitude range is −FS/0 or 0/+FS, this is equivalent to only the lower half or theupper half of the waveform memory being used. Therefore, the amplitude resolution is
reduced by 1 bit compared to ±FS.
• The amplitude setting when the amplitude setting is ±FS is Vp-p, and in the case of −FS/
0 or 0/+FS, it is Vpk. In either case, the amplitude refers to the peak-to-peak size of the
waveform.

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4. BASIC OPERATION

4.4.11 How to use auto range/range hold for the output voltage
Since auto range is set as part of the initial settings, the optimum range is automaticallyselected according to the amplitude and DC offset (including settings with high level andlow level). A transient voltage is generated when the range is changed, but control is
performed so that overvoltage does not result.
If the transient voltage generated as the result of range switching is not desirable, the range
can be fixed. However, reducing the amplitude while the range is fixed lowers the amplitudeaccuracy and waveform quality.

a) Setting method
Select the range
icon and thenpress the ENTER
key

1. Select the range icon on the right of theamplitude display to display the current
range under that icon. The current range
is displayed as a combination of maximum
output voltage Vp-p and the amplitudeattenuator.
Press the ENTER ENTER key to open therange processing choice list.

The current
range isdisplayed when
the range icon is
selected

2. Auto range is selected when [Auto] isselected from the choice list, and when
[Hold] is selected, the range is fixed to therange at that time. The respective range
icons are displayed as “Auto” and “Hold”.
Select the desired range processing andthen press the ENTER ENTER key.

Range
processing
choice listb) Maximum values of amplitude and DC offset when range is fixed
When the range is fixed, the maximum values of the amplitude and DC offset, and theexternal addition gain are as listed in the following table.
Range (Maximum
Output Voltage Vp-p,
Amplitude
Attenuator)

54

Maximum Value of Maximum Value of Maximum Value of
Amplitude
DC Offset
AC+DC(Load Open Value) (Load Open Value) (Load Open Value)

External Addition
Gain(±1 V Rating)

20 V, 0 dB

20 Vp-p

±10 V

±10 V

×10 or Off

20 V, −10 dB

6.325 Vp-p

±10 V

±10 V

×10 or Off

20 V, −20 dB

2 Vp-p

±10 V

±10 V

×10 or Off

20 V, −30 dB

0.6325 Vp-p

±10 V

±10 V

×10 or Off

4 V, 0 dB

4 Vp-p±2 V±2 V

×2 or Off

4 V, −10 dB

1.265 Vp-p

±2 V

±2 V

×2 or Off

4 V, −20 dB

0.4 Vp-p

±2 V

±2 V

×2 or Off

4 V, −30 dB

0.1265 Vp-p

±2 V

±2 V

×2 or OffMULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Items

4.4.12 Setting the load impedance
When the load impedance setting value is made the same as the actual load condition, theamplitude and DC offset (including setting with high level, low level) can be set with thevoltage value that appears at load end.
The load impedance value can be set in the range of 1 Ω to 10 kΩ, 50 Ω, or open (High-Z).
However, even if the load impedance setting value is changed, only the displayed amplitudesetting value and DC offset setting value change, and the load-open output voltage remains
unchanged.

a) Setting method

1. Select the load impedance icon on theright of the range icon and then press the
ENTER ENTER key.
Select the load
impedance icon
and then press
the ENTER key

The load
impedance
setting window
opens

Set the load
impedance
condition

2. The load impedance setting window
opens, so press the ENTER ENTER key
again.
The load impedance condition choice list
opens. Select the desired load impedance
and then press the ENTER ENTER key.
When [Variable] is selected, the load
impedance value can be set.

3. Once the load impedance setting has

Select [OK] andthen press the
ENTER key

been completed, select [OK] in the lower
part of the window and then press the
ENTER
ENTER key to apply the load
impedance setting change and close thewindow.
To not change the load impedance
setting, select [Cancel] in the lower part of
the window and then press the ENTER
ENTER key, or press the CANCEL CANCEL
key.

b) Conversion formula
Conversion is done with the following formula.
Load impedance setting value: Rload (Ω)
Load-open output voltage: Vopen
Output voltage setting value (load-end voltage): Vload

R loadV load = --------------------------- × V open
50 + R load

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4. BASIC OPERATION

Check・The output impedance is constant at 50 Ω.
・The output impedance error and output voltage error are not corrected.
The output voltage accuracy specification is the load-open value.

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4.4 Setting Methods for Main Items

4.4.13 Adding external signal
An external signal can be added to the waveform output of this equipment.

a) Connecting the addition signal
Connect the addition signal to the external modulation/addition input (MOD/ADD IN) BNC
terminal on the front panel and the rear panel in the WF1973 and WF1974, respectively.
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WF1974

Addition signal

CH1
addition signal

CH2
addition signal

For the input characteristics, ) p. 14.
This BNC terminal is insulated from the housing and has the same ground potential as the
waveform output of the same channel. For the floating ground connection, ) p. 19.

b) Enabling the addition signal
The external addition setting is done on the Utility screen.
1. Press the MENU MENU key to open the top
menu window. There, select [Utility] andthen press the ENTER ENTER key to
Select [Utility] inthe top menu anddisplay the Utility screen.
then press the
ENTER key

2. On the Utility screen, select the [Ext Add]
field and then press the
key.

ENTER

ENTER

Select [Ext Add]on the Utility
screen and thenpress the ENTER
key

The external
addition setting
window opens

Set the external
addition condition

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3. The external addition setting window
opens, so select the desired item and thenpress the ENTER ENTER key.
The external addition condition choice list
opens, so select the desired condition andthen press the ENTER ENTER key. [×2] and[x10] represent the addition gain.

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4. BASIC OPERATION

4. Once the external addition settings have

Select [OK] andthen press the
ENTER key

been completed, select [OK] in the lower
part of the window and then press the
ENTER
ENTER key to apply the external
addition setting change and close thewindow.
To not change the external addition
setting, select [Cancel] in the lower part of
the window and then press the ENTER
ENTER key, or press the CANCEL CANCEL
key.

c) When the desired external addition condition cannot be selected■ When the external addition cannot be set on (×2, ×10 setting)External modulation is used.
To use external addition, change the modulation source to the internal source.
The external addition input terminal is shared with the external modulation input
terminal. Therefore, when an external modulation source is specified for modulated
oscillation except FSK and PSK, external addition cannot be used. The external addition
setting is always [Off] at such time.
Similarly, when external addition is used, external modulation cannot be used (except FSK,
PSK).
■ When the external addition gain cannot be set to the desired value
The external addition gain is determined by the output voltage range.
To set the external addition gain to ×2, set the amplitude and DC offset so that the output
voltage range is 4 V.
To set the external addition gain to ×10, set the amplitude and DC offset so that the output
voltage range is 20 V.
Since external addition is done at the last stage of waveform output () p. 2), the addition
gain is closely related to the output voltage range. When the maximum output voltage of therange is 20 V and 4 V, the addition gain is fixed to ×10 and ×2, respectively. Other addition
gain values cannot be selected. ) p. 54
Conversely, when external addition is used, the maximum output voltage of the range isfixed according to the addition gain. It should be noted in particular that when the addition
gain is ×10, the maximum output voltage is fixed to 20 V, so that the amplitude accuracy
and waveform quality may decline when the amplitude is made smaller.

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MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Items

4.4.14 Setting the square wave duty
The waveform is assumed to be set to [Square]. For the waveform setting method, ) p. 44.
The duty setting unit is % only. Setting and display using time is not possible.

a) Duty setting method

1. Select the [Duty] field and then press the
ENTER key to open the duty input
field.
Even if there are several setting screens,the [Duty] field is always displayed on thefirst page.
ENTER

Duty input field

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or the [%] unit key (soft key) to set the input value and reflect it to the
output. If the ENTER key is used, the unit is set to %.

b) Variable duty range switching method
Normally, use [Off] (normal range).

1. Select the [Extend] field and then press
the ENTER ENTER key to open the variable
duty range extension on/off choice list.
Even if there are several setting screens,the [Extend] field is always displayed on
the first page.

Variable duty
range extension
choice list

2. Select the desired condition from the choice list and then press the ENTER ENTER key toapply the setting and reflect it to the output.
The desired condition can also be set and reflected to the output by inputting the numberof the desired condition displayed in the choice list from the numeric keypad.
The desired condition can also be set by inputting a number from the numeric keypad
while the [Extend] field is selected (without the choice list displayed).

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4. BASIC OPERATIONc) Difference between normal and extended variable duty range
Variable Range

Characteristics

NormalSetting range: 0.0100% to 99.9900%• Range in which the duty can be changed with little jitter and no pulse loss
• The higher the frequency, the narrower the duty setting range.
• At 15 MHz, the duty is fixed to 50%.

Extended

Setting range: 0.0000% to 100.0000% (independent of the frequency)• Jitter of 2.5 ns rms or less typ., duty can always be changed from 0% to 100%.
• If the high-level or low-level pulse width is less than 8.4 ns, the pulse may attimes vanish. However, on average, the duty is equivalent to the set duty.
• When 0% is set, the waveform is fixed on the low-level side, and when 100% isset, it is fixed to the high-level side. In either case, the pulse stops being output.

d) Duty and frequency limitations for standard variable duty range
The duty setting range is limited to the following range according to the frequency.
Frequency (Hz) / 300,000 ≤ Duty (%) ≤ 100 − Frequency (Hz) / 300,000
For example, the variable range at 3 MHz is limited to 10% to 90%.
If the above limitation according to the frequency setting is not satisfied, the duty is
adjusted.

Check
In the case of the extended variable duty range, the pulse may at times vanish,
and thus the frequency may become lower than the set frequency. Do not use
the extended variable duty range for applications that require that a constantfrequency be maintained.

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4.4 Setting Methods for Main Items

4.4.15 Setting the pulse width and leading/trailing edge time of a pulse wave
The waveform is assumed to be set to [Pulse]. For the waveform setting method, ) p. 44.
The pulse width can be set either with time or duty.
The leading and trailing edge times can be set only with time.

a) Pulse width time setting method

1. Select the [Width] field and then press the
ENTER key to open the pulse widthtime input field.
Even if there are several setting screens,the [Width] field is always displayed on thefirst page.
If [Duty] is displayed in the [Width] field
and the pulse width duty and not the pulse
width time is displayed, press the [Width]
soft key if the duty input field is open toswitch to the pulse width time display.
ENTER

Pulse width time
input field

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or the unit key (soft key) to set the input value and reflect it to the
output. If the ENTER key is used, the unit is set to s.

b) Pulse width duty setting method

1. Select the [Duty] field and then press the
ENTER key to open the pulse width
duty input field.
Even if there are several setting screens,the [Duty] field is always displayed on thefirst page.
If [Width] is displayed in the [Duty] field
and the pulse width time and not the pulse
width duty is displayed, press the [Duty]
soft key if the time input field is open toswitch to the pulse width duty display.
ENTER

Pulse width duty
input field

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or the [%] unit key (soft key) to set the input value and reflect it to the
output. If the ENTER key is used, the unit is set to %.

c) Switching the pulse width time and pulse width duty
○ Pulse width time → Pulse width duty
When the pulse width time input field is open and the current pulse width time isdisplayed, the [Duty] soft key is displayed. Press this key to open the pulse width duty
input field and change the item display from [Width] to [Duty]. The [Duty] soft key
changes to [Width].

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4. BASIC OPERATION○ Pulse width duty → Pulse width time
When the pulse width duty input field opens and the current pulse width duty isdisplayed, the [Width] soft key is displayed. Press this soft key to open the pulse widthtime input field and change the item display from [Duty] to [Width]. The [Width] soft key
changes to [Duty].

d) Difference between pulse width time setting and duty setting
The following operation differences exist depending on whether the pulse width is set withtime or duty.
Pulse width set with time

Pulse width set with duty

The pulse width time is constanteven if the frequency is changed

The pulse width duty is constanteven if the frequency is changede) Leading edge time and trailing edge time setting method
The leading edge time [LE] and trailing edge time [TE] can be set only with time.
1. To set the leading edge time, select the[LE] field and then press the ENTER ENTER
key to open the leading edge time input
field.
To set the trailing edge time, select the[TE] field and then press the ENTER
ENTER key to open the trailing edge time
Leading edge
time input field
input field.
Even if there are several setting screens,the [LE] and [TE] fields are displayed oneach page.

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or a unit key (soft key) to set the input value and reflect it to the output.
If the ENTER key is used, the unit is set to s.

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MULTIFUNCTION GENERATOR

4.4 Setting Methods for Main Itemsf) Pulse width, leading edge time, and trailing edge time definitions and limitations
The pulse width, leading edge time, and trailing edge time are defined as shown in thefollowing figure.
Pulse width
100%
90% 90%

50%

50%

10%

10%

0%

Leading edge
Trailing edge time
time
PeriodHowever, the setting ranges of the pulse width, leading edge time, trailing edge time, andfrequency are mutually limited as follows.
If the following limitations are not met by the frequency or pulse width setting, the leadingedge time and trailing edge time are adjusted first, and the pulse width is adjusted next.
■ Leading edge time and trailing edge time limitations
The ranges of the leading edge time, trailing edge time, and frequency or cycle are limited asfollows.
Largest of 0.01% of period or 15 ns ≤ Leading edge time
Largest of 0.01% of period or 15 ns ≤ Trailing edge timeFor example, the leading edge time and trailing edge time at 1 kHz are limited to 100 ns or
more.
■ Pulse width, leading edge time, and trailing edge time limitations
The ranges of the pulse width time, leading edge time, trailing edge time, and frequency or
cycle are limited as follows. If the pulse width is set with duty, the value converted to time isused as the pulse width time.
Leading edge time +trailing edge time× 0.85 ≤Pulse width≤ Period －time

Leading edge time +trailing edge time× 0.85For example, when the leading edge time and the trailing edge time are each set to 100 ns at
1 kHz, the pulse width time can vary in the range of 170 ns to 999.83 μs.

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4. BASIC OPERATION

4.4.16 Setting the ramp wave symmetry
The waveform is assumed to be set to [Ramp] (ramp wave). For the waveform setting
method, ) p. 44.
The symmetry setting unit is % only. Setting and display with time is not possible.

a) Symmetry setting method

1. Select the [Symm] field and then press the
ENTER key to open the symmetry
input field.
Even if there are several setting screens,the [Symm] field is always displayed on
the first page.
ENTER

Symmetry input
field

2. Select the digit to be changed with theleft/right arrow keys, and increment/
decrement the value with theup/down arrow keys or themodify knob. Thechange is instantly reflected to the output.
Alternatively, enter a numeric value using the 0 ... 9 numeric keypad. Then press the
ENTER ENTER key or the [%] unit key (soft key) to set the input value and reflect it to the
output. If the ENTER key is used, the unit is set to %.

b) Relationship between symmetry and waveform
One waveform cycle changes as follows according to the symmetry setting. A symmetry isexpressed by the amount of the ratios of the first and second rises. Except in the case of 0%
symmetry, the phase zero position is fixed to the 0 amplitude center position.
0%

Phase
zero position

20%

Phase
zero position

50%

80%

100%

Phase
zero position

Phase
zero position

Phase
zero position

If it is preferable for the phase zero position to be at the bottom of the waveform, use thebottom referenced ramp wave of a parameter-variable waveform. ) “1.2.7 Other waveformgroup” in the Application Instruction Manual
Example of 20% and 80% symmetry
for bottom referenced ramp wave

Phase
zero position

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4.5 Using Parameter-Variable Waveforms

4.5

Using Parameter-Variable Waveformsa) Outputting a parameter-variable waveform

Select [PWF]
and then press
the ENTER key

Select the [PWF] parameter-variable
waveform in the [Fctn] field and then press
the ENTER ENTER key.
The waveform that is currently set as theparameter-variable waveform is output.
Like for other waveforms, the polarity andamplitude range of the waveform can also
be changed.

b) Changing the waveform of a parameter-variable waveform
Set the waveform
to [PWF]

Polarity/amplitude
range icon
Select the [Select]button and thenpress the ENTER
key

When the [Select] button is selected,
the current parameter-variable
waveform name is displayed

1. When the waveform is set to [PWF](parameter-variable
waveform),the[Select] button is displayed to the right ofthe polarity/amplitude range icon.
When this button is selected, the currently
selected parameter-variable waveform
name is displayed.
Press the ENTER ENTER button to display
the parameter-variable waveform selection screen.

2. The parameter-variable waveform setting and various parameter settings can be done in
the parameter-variable waveform selection screen. “Oscillator > PWF Select” is displayedin the top left part of the parameter-variable waveform selection screen.
Waveform polarity/amplitude range
Waveform group
Waveform
Variable parametersof waveform
Waveform graphApplies the changes andexits the selection screen
Returns the variable
parameter values tothe initial values

Discards the changes andexits the selection screen

Due to the large number of parameter-variable waveforms, they are categorized into a
number of different groups.
First, select the desired group in the [Group] field.
Next, in the [Waveform] field, set the desired waveform from the various waveforms listed
within the selected group.
Set the polarity and amplitude range of the waveform with the polarity/amplitude range
icon. These settings are done independently for each waveform, and can be changed
even when the selection screen has been exited.
Each waveform has up to 5 specific parameters. Set the desired value for each one ofthese parameters.

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4. BASIC OPERATIONTo return the variable parameter values to their initial value, press the [Reset] soft key.
The change is instantly reflected to the output waveform, and the shape of the set
waveform is displayed in graph form.
For details on the variable parameters, ) “1. DETAILS OF PARAMETER-VARIABLE
WAVEFORMS” in the Application Instruction Manual.

3. To apply the changes and quit the selection screen, press the [OK] soft key.
To discard the changes and quit the selection screen, press the [Cancel] soft key.
The changes can also be applied and the selection screen exited by pressing a basic
parameter shortcut key.

Check
The waveform may disappear according to the parameter settings.
If you do not know how to restore the waveform display, press the [Reset] soft
key. This will return each parameter value to the factory default. The polarity
and amplitude range remain unchanged.

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MULTIFUNCTION GENERATOR

4.6 Using Arbitrary Waveforms

4.6

Using Arbitrary Waveformsa) Outputting an arbitrary waveform

Select [ARB] andthen press the
ENTER key

Select [ARB] (arbitrary waveform) in the[Fctn] field and then press the ENTER
ENTER key.
The currently set arbitrary waveform is
output.
Like for other waveforms, the polarity andamplitude range of the waveform can also
be changed.

b) Changing the waveform of an arbitrary waveform
Set the waveform
to [ARB]

Polarity/amplitude
range icon
Select the [Select]button and thenpress the ENTER
key.

When the [Select] button is selected,
the number and name of the current
arbitrary waveform is displayed.

1. When the waveform is set to [ARB](arbitrary waveform), the [Select] button isdisplayed to the right of the polarity/
amplitude range icon.
When this button is selected, the currently
selected arbitrary waveform name isdisplayed.
Press the ENTER ENTER button to display
the screen for selecting currently saved
arbitrary waveforms.

2. Arbitrary waveform selection and name change can be done on the arbitrary waveform
selection screen. “Oscillator > ARB Select” is displayed in the top left part of the arbitrary
waveform selection screen.
Set the number of the waveform in the [ARB No.] field. The waveform can be selectedfrom waveform No. 0 saved in volatile editing memory and the waveforms No. 1 to No.
128 saved in non-volatile memory. The outline of the selected waveform can be checkedwith the graph display. The [Type] field shows the arbitrary waveform data format, and the[Size] field shows the memory size used for saving data.
Arbitrary waveform number

Arbitrary waveform nameArbitrary waveformoutlineList of currently saved
arbitrary waveforms
Applies the changes andexits the selection screen.
Discards the changes
and exits the selection
screen.

The changes are not reflected to the output waveform until applied by pressing the [OK]soft key (the operation differs from that for parameter-variable waveforms).
Arbitrary waveforms cannot be created on this screen. For how to create arbitrary
waveforms, data fomat, and memory size, ) “2. CREATING ARBITRARY WAVEFORMS”
in the Application Instruction Manual.
The name changing method is the same as for the setting memory. Names of up to 20
characters can be set. ) p. 123

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4. BASIC OPERATION

3. To apply the changes and quit the selection screen, press the [OK] soft key.
To discard the changes and quit the selection screen, press the [Cancel] soft key.
The changes can also be discarded and the selection screen exited by pressing a basic
parameter shortcut key (the operation differs from that in the parameter-variable
waveform selection screen).

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4.7 Modulation Setting and Manipulation

4.7

Modulation Setting and Manipulation

4.7.1 Modulation types
The following eight types of modulation can be done.
• FM: Frequency Modulation ) p. 75• FSK: Frequency Shift Keying
This is binary frequency shift modulation. ) p. 76• PM: Phase Modulation ) p. 77• PSK: Phase Shift Keying
This is binary phase shift modulation. ) p. 78• AM: Amplitude Modulation ) p. 79• AM(DSB-SC): Amplitude Modulation（Double Side Band − Suppressed Carrier）
This is AM that does not include the carrier frequency component. ) p. 80• DC offset modulation ) p. 81• PWM: Pulse Width Modulation ) p. 82

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4.7.2 Screen for modulation setting and manipulation
This subsection describes the screen configuration used in common for the modulated
oscillation mode.
The settings and manipulations are done on the Oscillator setting screen. The Oscillator
setting screen is displayed as “Oscillator” in the top left part of the screen. When anotherscreen is displayed, press the MENU MENU key to display the top menu, then select[Oscillator] and press the ENTER ENTER key.

a) Setting the oscillation mode to modulations

Select [Modulation] in [Mode] andthen press the
ENTER key

Set [Mode] (oscillation mode) to [Modulation] on the Oscillator setting screen. The
oscillation mode is switched to modulation
as a result.
In the modulated oscillation mode, thesetting screen consists of two pages,
which can be toggled with the NEXT NEXTkey.

b) 1st page of setting screen: Screen for setting the carrier signal
This is the modulation carrier signal setting screen, which is common to all the oscillation
modes.
Set the oscillation mode to[Modulation]

Indicates that the
1st page isdisplayed

Press the NEXT
key to display
the 2nd pagec) 2nd page of setting screen: Screen for setting the modulation
The figure shows an example of selecting FM as the modulation type.

Modulation width
Modulation source
Internal modulation waveform
Internal modulation frequency
Sync output

Indicates that the
2nd page isdisplayed
Modulation typePress the NEXT
key to display
the 1st page

Modulation type [Type]
This is the type of modulation. FM, FSK, PM, PSK, AM, AM (DSB-SC), DC offset
modulation, and PWM can be chosen from. ) p. 72
Modulation width [Deviation, Depth, HopFreq]
This is the modulation width. The name of this item differs according to the modulation
type. ) p. 72

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4.7 Modulation Setting and Manipulation

Modulation source [Source]
Either an internal or external modulation source can be selected. ) p. 72
Internal modulation waveform [ModFctn]
This is the internal modulation source waveform. Sine, square, triangular, rising ramp,
falling ramp, noise, and arbitrary can be chosen from. ) p. 72
Internal modulation frequency [ModFreq]
This is the frequency of the internal modulation source. ) p. 72
Sync output [SyncOut]
This is the output signal from the sync/sub-output terminal. Waveform basic phasesync, internal modulation sync, and internal modulation waveform can be chosen from.
) p. 74

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4.7.3 Common modulation settings and manipulations
This subsection describes the settings and manipulations that are common to all types ofmodulation.

a) To set the oscillation mode to modulation → Oscillation mode setting
Select[Modulation] in[Mode] and thenpress theENTER keyb) To select the modulation typeOn the Oscillator setting screen, set[Mode] (oscillation mode) to [Modulation].
This changes the mode to the modulated
oscillation mode.
In the modulated oscillation mode, thesetting screen consists of two pages,
which can be toggled with the NEXT NEXTkey.

→ Modulation type setting

The following eight modulation types can be selected in [Type] (modulation type) on the 2nd
page of the setting screen.
• FM[FM] ) p. 75
Modulation type

• FSK[FSK]• PM[PM]) p. 76) p. 77• PSK[PSK]• AM[AM]) p. 78) p. 79• AM(DSB-SC)[AM(SC)]) p. 80• DC offset modulation [OFSM]• PWM[PWM]) p. 81) p. 82c) To set the carrier condition
Set the various parameters of the carrier signal on the 1st page of the setting screen.

d) To set the modulation width
The modulation width setting is done on the 2nd page of the setting screen. The item namethat is displayed is either [Deviation], [Depth], or [HopFreq], depending on the modulation
type.
For details, refer to the description of each modulation type.

e) To perform modulation with the internal signal source
Set [Source] (modulation source) on the 2nd page of the setting screen to [Int] (internal).
[ModFctn] (internal modulation waveform) and [ModFreq] (internal modulation frequency)
must also be set.
[ModFctn] (internal modulation waveform) can be selected from the following seven choices.
• Sine [Sine]• Falling ramp [DnRamp]• Square (50% duty) [Square]• Noise [Noise]• Triangle (50% symmetry) [Triangle]• Arbitrary [ARB]• Rising ramp [UpRamp]

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The internal modulation frequency cannot be set if the internal modulation waveform isnoise.
If the modulation type is FSK or PSK, the internal modulation waveform is fixed to a 50%
duty square wave, and the internal modulation waveform cannot be selected.
When an arbitrary waveform is selected for the internal modulation waveform, waveform
data simply decimated to 4096 points from the start is used as the modulation waveform incase of the array format. When [RAW] is shown in the [Type] field in the arbitrary waveform
selection screen, the arbitrary waveform is in the array format. If the value in the [Size]
field is 17 KB or more, the original waveform size is larger than 4096 points. On the other
hand, when [Point] is shown in the [Type] field, the arbitrary waveform is in the control
point format. The arbitrary waveform in this format, the waveform is developed using 4096
points to maintain the waveform characteristics as much as possible. For details on thearbitrary waveforms, ) “2. CREATING ARBITRARY WAVEFORMS” in the Application
Instruction Manual.

f) To perform modulation with an external signal source
Set [Source] (modulation source) on the 2nd page of the setting screen to [Ext] (external).
The external modulation signal input terminal differs as follows according to themodulation type.
■ When the modulation type is FM, PM, AM, AM(SC), OSFM, or PWM
Input the modulation signal to the external modulation/addition input terminal. The
modulation width setting is the value when the signal level is ±1 V. If the input level islower than ±1 V, keep it mind that the modulation width may become below the specified
modulation width.
When the external modulation/addition input terminal is used for external addition input,
the external modulation function cannot be used.
■ When the modulation type is FSK or PSK
Input the modulation signal (TTL level) to the external trigger input terminal.
The polarity can be set on the screen.

g) To start modulation
soft key.

→ Modulation starts automatically. Resume with the [Start]

When the modulated oscillation mode is set, modulated oscillation starts automatically.
However, if the modulation setting is improper, modulated oscillation will not start.
([Conflict!] is displayed in the top right part of the screen in this case.) When the [?] soft key
appearing at the left end is pressed, a message about the inappropriate setting is displayed.
Once the setting has been changed to an appropriate setting, modulated oscillation starts.
When modulation has been paused, it can be resumed by pressing the [Start] soft key.

h) To stop modulation → [Stop] soft key
Modulation can be paused.
When the [Stop] soft key is pressed during modulation, modulation stops and the carrier
signal is output without being modulated. The oscillation mode remains the modulated
oscillation mode.

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i) To output modulation sync signal, modulation waveform signal → Sync output
setting
Perform the sync output setting with [SyncOut] (sync output) on the 2nd page of the setting
screen. The sync output setting can be chosen from the following three.
・Signal synchronized with reference phase of waveform [Sync]
・Signal synchronized with internal modulation waveform [ModSync]
・Internal modulation waveform [ModFctn]■ When [Sync] is selected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/
sub-output terminal.
■ When [ModSync] is selected
A TTL level signal synchronized with the internal modulation waveform is output from thesync/sub-output terminal. This is a 50% duty square wave that rises at the zero phase
position of the internal modulation waveform. If the internal modulation waveform is noise,
it is fixed to low level.
When the signal being modulated is observed with an oscilloscope, it can be used as thetrigger signal for the oscilloscope.
■ When [ModFctn] is selected
The internal modulation waveform is output from the sync/sub-output terminal. The signal
level is ±3 V/open.
[ModFctn] cannot be selected when the modulation type is FSK or PSK.

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4.7.4 Setting FM
The output frequency varies according to the instantaneous value of the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) FM example
Frequency shifting of the output signal grows larger when the modulation signal swings to
the positive side.
Modulation sync signal(during internal modulation)

Modulation signal

Output signalb) Selecting FM

Select [FM] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation], set [Type] (modulation type)on the 2nd page of the setting screen to[FM] (FM).

c) Waveforms for which FM is not possible
FM is not possible for noise, pulse wave, and DC.

d) Setting items required for FM
Set [Freq] (carrier frequency) on the 1st page of the setting screen.
Set [Deviation] (peak frequency deviation) on the 2nd page of the setting screen.
The output frequency varies according to the range of carrier frequency ± peak frequency
deviation.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation
waveform) and [ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to theexternal modulation/addition input terminal. In the case of ±1 V input, the prescribed peakfrequency deviation results.

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4.7.5 Setting FSKThis is binary frequency shift modulation by which the output frequency switches between
the carrier frequency and hop frequency according to the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) FSK example
The frequency changes suddenly, but the phase continuity of the output signal ismaintained.
Modulation sync signal(during internal modulation)

Modulation signal(during external modulation,
positive polarity)

Hopfrequency

CarrierfrequencyHopfrequency

Output signalb) Selecting FSK

Select [FSK] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation] (modulation), set [Type](modulation type) on the 2nd page of thesetting screen to [FSK] (FSK).

c) Waveforms for which FSK is not possible
FSK is not possible for noise, pulse wave, and DC.

d) Setting items required for FSK
Set [Freq] (carrier frequency) on the 1st page of the setting screen.
Set [HopFreq] (hop frequency) on the 2nd page of the setting screen.
The output frequency alternates between the carrier frequency and the hop frequency.
If [Source] (modulation source) is [Int] (internal), set [ModFreq] (modulation frequency).
If [Source] (modulation source) is [Ext] (external), set the trigger polarity and input themodulation signal (TTL level) to the external trigger input terminal. If the polarity is set to[High] (positive), the carrier frequency is output during low-level input, and the hop
frequency is output during high-level input, and vice versa if the polarity is set to [Low].

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4.7.6 Setting PM
The output phase varies according to the instantaneous value of the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) PM example
Phase shifting of the output signal grows larger when the modulation signal swings to thepositive side.
Since the phase changes along with time, the instantaneous frequency also changes
simultaneously.
Modulation sync signal(during internal modulation)

Modulation signal

Output signalb) Selecting PM

Select [PM] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation], set [Type] (modulation type)on the 2nd page of the setting screen to[PM] (PM).

c) Waveforms for which FM is not possible
PM is not possible for noise and DC.

d) Setting items required for PM
Set [Deviation] (peak phase deviation) on the 2nd page of the setting screen.
The output phase changes in the range of ± peak phase deviation.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation
waveform) and [ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to theexternal modulation/addition input terminal. In the case of ±1 V input, the prescribed peakfrequency deviation results.

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4.7.7 Setting PSKThis is binary phase shift modulation by which the output phase is offset according to themodulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) PSK example
Since the phase changes suddenly, the output signal waveform is non-continuous.
Modulation sync signal(during internal modulation)

Modulation signal(during external modulation,
positive polarity)

Phase
deviation
additionPhasedeviation zeroPhase
deviation
addition

Output signalb) Selecting PSK

Select [PSK] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation], set [Type] (modulation type)on the 2nd page of the setting screen to[PSK] (PSK).

c) Waveforms for which PSK is not possible
PSK is not possible for noise and DC.

d) Setting items required for PSK
Set [Deviation] (phase deviation) on the 2nd page of the setting screen.
The phase deviation zero state and the specified phase deviation state alternate for the
output.
Note that the phase does not vary in the ± phase deviation range.
If [Source] (modulation source) is set to [Int] (internal), set [ModFreq] (modulation
frequency).
If [Source] (modulation source) is [Ext] (external), set the trigger polarity and input themodulation signal (TTL level) to the external trigger input terminal. If the polarity is set to[High] (positive), the phase deviation is zero during low-level input, and the specified phasedeviation is output during high-level input, and vice versa if the polarity is set to [Low].

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4.7.8 Setting AM
The output amplitude changes according to the instantaneous value of the modulation
signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) AM example
The amplitude of the output signal grows larger when the modulation signal swings to thepositive side.
Modulation sync signal(during internal modulation)

Modulation signal

Output signal

Amplitude setting value (Vp-p) / 2 x(1 + modulation depth (%) / 100)

Amplitude setting value (Vp-p) / 2 x(1 – modulation depth (%) / 100)b) Selecting AM

Select [AM] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation] (modulation), set [Type](modulation type) on the 2nd page of thesetting screen to [AM] (AM).

c) Waveforms for which AM is not possible
AM is not possible for DC.

d) Setting items required for AM
Set [Amptd] (carrier amplitude) on the 1st page of the setting screen.
Set [Depth] (modulation depth) on the 2nd page of the setting screen.
The output amplitude varies in the range of carrier amplitude setting value (Vp-p) / 2 × (1 ±modulation depth (%) / 100).
When the modulation depth is 0% or the modulation is stopped, the output amplitude is 1/2of that during continuous oscillation.
When the modulation depth is 100%, the maximum output amplitude envelope value isequal to the carrier amplitude setting value.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation
waveform) and [ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to theexternal modulation/addition input terminal. In the case of ±1 V input, the prescribed
modulation depth results.

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4.7.9 Setting AM (DSB-SC)
The output amplitude varies according to the instantaneous value of the modulation signal.
This is AM without the carrier frequency component. DSB-SC stands for Double Side Band
− Suppressed Carrier.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) AM (DSB-SC) example
When the absolute value of the modulation signal amplitude is large, the amplitude of theoutput signal is also large. When the value of the modulation signal is negative, the polarityof the output signal is inverted.
Modulation sync signal(during internal modulation)

Modulation signal

Output signal

Amplitude setting value (Vp-p) × modulation depth (%) / 100b) Selecting AM (DSB-SC)

Select [AM(SC)] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation] (modulation), set [Type](modulation type) on the 2nd page of thesetting screen to [AM(SC)] (AM (DSBSC)).

c) Waveforms for which AM (DSB-SC) is not possible
AM (DSB-SC) is not possible for DC.

d) Setting items required for AM (DSB-SC)
Set [Amptd] (carrier amplitude) on the 1st page of the setting screen.
Set [Depth] (modulation depth) on the 2nd page of the setting screen.
The output amplitude varies in the range of carrier amplitude setting value (Vp-p) ×
modulation depth (%) / 100.
When the modulation depth is 100%, the maximum output amplitude envelope value isequal to the carrier amplitude setting value.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation
waveform) and [ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to theexternal modulation/addition input terminal. In the case of ±1 V input, the prescribed
modulation depth results.

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4.7.10 Setting DC offset modulation
DC offset varies according to the instantaneous value of the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) DC offset modulation example
DC offset of the output signal grows larger when the modulation signal swings to thepositive side.
Modulation sync signal(during internal modulation)

Modulation signal

Output signal

0V

DC offset setting± peak DC offset deviationb) Selecting DC offset modulation

Select [OFSM] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Modulation] (modulation), set [Type](modulation type) on the 2nd page of thesetting screen to [OFSM] (DC offset
modulation).

c) Waveforms for which DC offset modulation is not possible
None. DC offset modulation is possible for all waveforms.

d) Setting items required for DC offset modulation
Set [Offset] (carrier DC offset) on the 1st page of the setting screen.
Set [Deviation] (peak DC offset deviation) on the 2nd page of the setting screen.
The output DC offset varies in the range of carrier DC offset setting ± peak DC offset
deviation.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation
waveform) and [ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to theexternal modulation/addition input terminal. In the case of ±1 V input, the prescribed peak
DC offset deviation results.

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4.7.11 Setting PWM
The duty of square waves and pulse waves varies according to the instantaneous value ofthe modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.

a) PWM example
The duty of the output signal grows larger when the modulation signal swings to thepositive side.
Modulation sync signal(during internal modulation)

Modulation signal

Output signalb) Selecting PWM

Select [PWM] in[Type] and thenpress the ENTER
key

When [Mode] (modulation mode) is set to[Modulation] (modulation), set [Type](modulation type) on the 2nd page of thesetting screen to [PWM] (PWM).

c) Waveforms for which PWM is not possible
PWM is possible only for square waves and pulse waves.
PWM is not possible for other waveforms.

d) Setting items required for PWM
Set [Duty] (carrier duty) on the 1st page of the setting screen.
Set [Deviation] (peak duty deviation) on the 2nd page of the setting screen.
The output duty varies in the range of carrier duty ± peak duty deviation.
When the pulse wave is used, the pulse width of the carrier is fixed to the duty setting andcannot be set with time.
If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation
waveform) and [ModFreq] (modulation frequency).
If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to theexternal modulation/addition input terminal. In the case of ±1 V input, the prescribed peak
duty deviation results.

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4.8 Sweep Setting and Manipulation

4.8

Sweep Setting and Manipulation

4.8.1 Sweep types
The following five types of sweep can be done.
• Frequency sweep• Phase sweep) p. 95) p. 97• Amplitude sweep) p. 99• DC offset sweep) p. 101• Duty sweep) p. 103

4.8.2 Screen for sweep setting and manipulation
This subsection describes the screen configuration used in common for the sweep oscillation
mode.
The settings and manipulations are done on the Oscillator setting screen. The Oscillator
setting screen is displayed as “Oscillator” in the top left part of the screen. When anotherscreen is displayed, press the MENU MENU key to display the top menu, then select[Oscillator] and press the ENTER ENTER key.

a) Setting the oscillation mode to sweep

Select [Sweep] in[Mode] and thenpress the ENTER
key

Set [Mode] (oscillation mode) to [Sweep]on the Oscillator setting screen. The
oscillation mode is switched to sweep as aresult.
In the sweep oscillation mode, the setting
screen consists of three pages, which canbe switched with the NEXT NEXT key.

b) 1st page of setting screen: Screen for setting the basic parameters
These are the common setting items that are common to all the oscillation modes. Some ofthe settings may be invalid depending on the sweep type.
Set the oscillation
mode to [Sweep]

There are twostages of soft
keys

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Indicates that the
1st page isdisplayed

Press the NEXT
key to display
the 2nd page83

4. BASIC OPERATIONc) 2nd page of setting screen: Screen for the main sweep settings
The figure is an example that shows frequency selection as the sweep type.
Sweep start value

Sweep stop value
Sweep timeSingle-shot, gated singleshot sweep trigger
Sweep mode
Sweep function

Indicates that the
2nd page isdisplayed
Sweep type
Sweep marker value
Press the NEXT
key to switch tothe 3rd page

Two soft key stages

Sweep type [Type]
This is the type of sweep. Frequency, phase, amplitude, DC offset, and duty can bechosen from. ) p. 86
Sweep start value [Start]
This is the sweep start value.
Sweep stop value [Stop]
This is the sweep stop value.
Sweep time [Time]
This is the transition time from the start value to the stop value.
Sweep mode [SwpMode]
This is the sweep oscillation mode. Continuous sweep, single-shot sweep, and gatedsingle-shot sweep can be chosen from. ) p. 87
Trigger [Trig]
This is the trigger condition for single-shot sweep and gated single-shot sweep.
Internal and external can be chosen as the trigger source. ) p. 90
Sweep function [SwpFctn]
This is the sweep form. One-way and shuttle can be chosen from. Linear and log arealso possible if the sweep type is frequency. ) p. 86
Sweep marker value [Marker]
This is the sweep marker value. ) p. 92

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4.8 Sweep Setting and Manipulationd) 3rd page of setting screen: Screen for complementary settings for sweep
The figure is an example that shows frequency selection as the sweep type.
Stop level of gated singleshot sweep

Sweep control withmulti-I/O connector

Indicates that the
3rd page isdisplayed

Gated sweep
oscillation stop unit
Sync output
Two soft key stages

Press the NEXT
key to display
the 1st page

Stop level [StpLvl]
This is the signal level when gated single-shot sweep oscillation is stopped. It can be set
either to [Off] or [On] for setting the level. Normally, [Off] is set. ) p. 89
External control with multi-I/O connector [ExtCtrl]
Enables/disables external control with the multi-I/O connector. ) p. 94
Oscillation stop unit for gated single-shot sweep [OscStop]
This is the oscillation stop unit for gated single-shot sweep. The unit can be selectedfrom 1 cycle and 1/2 cycle. Normally, the unit is set to 1 cycle. ) p. 89
Sync output [SyncOut]
This is the output signal from the sync/sub-output terminal. Waveform reference phasesync, sweep sync, sweep marker, and sweep X drive can be selected from. ) p. 92

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4.8.3 Common sweep settings and manipulations
This subsection describes the settings and manipulations that are used in common
regardless of the item to be swept.

a) To set the oscillation mode to sweep → Oscillation mode setting
On the Oscillator setting screen, set[Mode] (oscillation mode) to [Sweep]. Thischanges the mode to the sweep oscillation
mode.
In the sweep oscillation mode, the setting
screen consists of three pages, which canbe switched with the NEXT NEXT key.

Select [Sweep] in[Mode] and thenpress the ENTER
keyb) To select the item to be swept → Sweep type setting
The following five sweep items can be selected in [Type] (sweep type) on the 2nd page of thesetting screen.
• Frequency sweep [Freq] ) p. 95
Sweep type• Phase sweep [Phase]) p. 97• Amplitude sweep [Amptd]) p. 99• DC offset sweep [Offset]) p. 101• Duty sweep [Duty]) p. 103c) To set the sweep range and time
Set the following items on the 2nd page of the setting screen.
• Start value [Start]• Stop value [Stop]• Sweep time [Time]: This is the transition time from the start value to the stop value.
For details, refer to the description of each sweep type.

d) To set the sweep range with center and span
When the start value or stop value input field is open on the 2nd page of the setting screen
and the current value is displayed, the [Center] or [Span] soft key is displayed. When thiskey is pressed, the center value or span value input field opens, and the item displayschange from [Start] and [Stop] to [Center] and [Span], respectively.
The [Center] or [Span] soft key changes to [Start] or [Stop]. When the [Start] or [Stop] soft
key is pressed at this time, the start value or stop value input field is displayed.
The center value is the average of the start value and stop value. The span value is theabsolute value of the difference between the start value and the stop value. Even if
frequency log sweep is selected, the center value is the linear average of the start value andstop value.
Even when center value and span value display are selected, the relation of magnitude
between the start value and stop value is saved.

e) To sweep a sawtooth wave → One-way sweep
Set [SwpFctn] (sweep function) on the 2nd page of the setting screen to [Lin-OneWay]
In the case of frequency sweep, it is also possible to set the slope to [Lin-OneWay] (linear) or[Log-OneWay] (log).

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4.8 Sweep Setting and Manipulation

One-way sweep

Sweep valuef) To sweep a triangular wave → Shuttle sweep
Set [SwpFctn] (sweep function) on the 2nd page of the setting screen to [Lin-Shuttle](shuttle).
In the case of frequency sweep, it is also possible to set the slope to [Lin-Shuttle] (linear) or[Log-Shuttle] (log).
Shuttle sweep

Sweep valueg) To change the rising/falling direction of the sweep → Magnitude relation of startand stop values
When sweeping is done with a sawtooth wave (one-way sweep), sweeping is done from thestart value to the stop value. If start value < stop value, the value increases during sweep
execution. Reversely, if start value > stop value, the value decreases during sweep
execution.
When the [Stt ⇔ Stp] soft key included in the second stage of the soft key set on the 2nd pageof the setting screen ([ ▼ 2/2] is displayed on the right-most soft key) is pressed, the startvalue and stop value can be swapped.

h) To continuously repeat sweep → Continuous sweep
Set [SwpMode] (sweep mode) on the 2nd page of the setting screen to [Cont] (continuous).
No trigger signal is required.
The transition time from the start value to the stop value is set with [Time] (sweep time) on
the 2nd page.

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Since the sweep time is the transition time from the start value to the stop value, when thesweep function is shuttle, the repeat period is twice the length of the sweep time setting, asshown in the following figure.
Continuous one-way sweep
Stop value
Sweep value
Start value
Sweep time
Frequency sweep example

Continuous shuttle sweep
Stop value
Sweep value
Start value

Sweep time

Sweep time

Frequency sweep examplei) To start sweep in synchronization with a trigger → Single-shot sweep
Set [SwpMode] (sweep mode) on the 2nd page of the setting screen to [Single] (single).
Since a trigger signal is required, set the trigger signal with [Trig] (trigger) on the 2nd page.
For the trigger setting procedure, ) p. 90.
The transition time from the start value to the stop value is set with [Time] (sweep time) on
the 2nd page.
In the case of single-shot sweep, one sweep is executed upon reception of a trigger.
The change sequence differs depending on whether the sweep function is one-way or
shuttle, as shown in the following figure.
In the case of one-way sweep, the start value is immediately returned to upon sweep
completion.
In the case of shuttle sweep, execution enters standby in the sweep completion state.
Single-shot one-way sweep
Trigger
Stop value
Sweep value
Start value

Sweep time

Start value

Frequency sweep example

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4.8 Sweep Setting and Manipulation

Single-shot shuttle sweep
Trigger

Stop value
Sweep value
Start value

Sweep time

Sweep time

Frequency sweep examplej) To output the waveform only during sweep execution
sweep→ Gated single-shot

Set [SwpMode] (sweep mode) on the 2nd page of the setting screen to [Gated] (gated singleshot). This operation combines gated oscillation and sweep, with sweep execution insynchronization with a trigger.
Since a trigger signal is required, set the trigger signal with [Trig] (trigger) on the 2nd page.
For the trigger setting procedure, ) p. 90.
■ Oscillation start/stop phase
The oscillation start/stop phase setting is done with [Phase] (phase) on the 1st page of thesetting screen.
However, during phase sweep, the start phase setting is the oscillation start phase, and thestop phase setting is the oscillation stop phase.
■ Stop level (normally set to [Off])To set the level while the oscillation is stopped separately from the phase, set [StpLvl] (stoplevel) on the 3rd page of the setting screen to [On] (on) and set the level with a % value using
the amplitude full scale as reference. Normally, [Off] (off) is set. When [Off] is selected, thesignal level while oscillation is stopped is determined by the phase set in [Phase] on the 1st
page of the setting screen. For details on the stop level, ) p. 112.
■ Oscillation stop unit (normally set to [Cycle] (1 cycle))
To stop oscillation in half-cycle units, set [OscStop] (oscillation stop unit) on the 3rd page ofthe setting screen to [HalfCycle] (half cycle). Normally, set to [Cycle] (1 cycle). When [Cycle](1 cycle) is set, whole integer cycle oscillation results.
When oscillation is stopped, it always stops either in 1-cycle or half-cycle units according to
the [OscStop] (oscillation stop unit) setting, and the oscillation time is usually longer than
the sweep time setting.

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Gated single-shot one-way sweep
Trigger
Stop value
Sweep value
Start value

Sweep time

Start value

Frequency sweep example

Gated single-shot shuttle sweep
Trigger

Stop value
Sweep value
Start value

Sweep time

Sweep time

Frequency sweep example

Check
In the case of phase sweep, the start phase setting is the oscillation start phase,and the stop phase setting is the oscillation stop phase.

k) To set trigger condition for single-shot sweep and gated single-shot sweep
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
manipulation, and remote trigger manipulation.
Upon receipt of a trigger, the TRIG’D lamp next to the MAN TRIG key lights.
The trigger condition is set with [Trig] (trigger) on the 2nd page of the setting screen.
■ Trigger source setting
The trigger source can be chosen from [Int] (internal) and [Ext] (external).
When the trigger source is [Int] (internal), the trigger period can be set.
When the trigger source is [Ext] (external), the trigger polarity can be set.
If the trigger source is set to [Ext] (external), a TTL level trigger signal is input to theexternal trigger input terminal (TRIG IN).
Sweeping can be started and stopped independently of the trigger source setting throughinput of a logic signal to the multi-I/O connector. ) p. 94■ Usage of manual trigger and remote trigger
Manual trigger manipulation and remote trigger manipulation are always effective
regardless of the trigger source setting.
The [Start] soft key and the90

MAN TRIGMAN TRIG key can be used for manual trigger

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4.8 Sweep Setting and Manipulation

manipulation.
Note that, in the case of the WF1974, the MAN TRIG key works for the channel whose
display is active.
For details on the channel whose display is active, ) p. 38.
To use only manual trigger manipulation and remote trigger manipulation as the trigger,
set the trigger source to [Ext] (external). Also, to prevent malfunction due to external noise,
it is recommended to set the polarity to [Off].

l) To start sweep → [Start] soft key or trigger
When, during continuous sweep, the mode is the sweep oscillation mode, the sweep
operation starts automatically.
However, if the sweep setting is improper, sweep oscillation will not start. ([Conflict!] isdisplayed in the top right part of the screen.) When the [?] soft key appearing at the left end
is pressed, a message about the inappropriate setting is displayed. Once the setting has
been changed to a suitable setting, sweep oscillation starts.
If sweep operation is currently stopped, press the [Start] soft key to start it. If the [Start]
key is not displayed, press the [ ▼ 2/2] soft key on the right end to switch soft key sets.
In the case of single-shot sweep and gated single-shot sweep, sweeping starts upon receipt ofa trigger.
However, if the sweep setting is improper, no trigger can be received ([Conflict!] is displayedin the top right part of the screen). When the [?] soft key appearing at the left end is pressed,
a message about the inappropriate setting is displayed. Once the setting has been changed
to a suitable setting, trigger reception becomes possible.
MAN TRIG

The [Start] soft key and themanual trigger key on the panel operate like manualtrigger regardless of the trigger source setting.

m) To stop sweep → [Stop] soft key
When the [Stop] soft key is pressed during sweep execution, the sweep operation stops andthe sweep start value output state (and not the stop value output state) is entered. Whenthe [Stop] soft key is not displayed, press the [ ▼ 2/2] soft key on the right end to switch soft
key sets.
However, during single-shot sweep and gated single-shot sweep, sweeping resumes uponreceipt of a new trigger.

n) To pause sweep → [Hold] soft key
Press the [Hold] soft key during sweep execution to pause the sweep operation. Then, whenthe [Resume] soft key is pressed, the sweep operation resumes from where it was paused. If
the [Hold] or [Resume] soft key is not displayed, press the [ ▼ 2/2] soft key on the right end
to switch the soft key sets.
However, during hold for single-shot sweep and gated single-shot sweep, sweeping starts
from the start upon receipt of a new trigger.
The [Hold] and [Resume] soft keys are displayed in the same location. [Hold] is displayed
during sweep execution, and [Resume] is displayed when the sweep operation is paused.

o) To output the sweep start value → [SttState] soft key
Press the [SttState] soft key to set the sweep start value output state.
The status of the equipment under test at the sweep start value can be checked.
The [SttState] soft key is displayed in the sweep start value output state or in the sweep
stop value output state. If the [SttState] soft key is not displayed, press the [ ▼ 2/2] soft key
on the right end to switch the soft key sets.

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4. BASIC OPERATIONIn the case of gated single-shot sweep, the state is the start value oscillation state. To stop
oscillation, press the [Stop] soft key.

p) To output the sweep stop value → [StpState] soft key
Press the [StpState] soft key to set the sweep stop value output state.
The status of the equipment under test at the sweep stop value can be checked.
The [StpState] soft key is always displayed in the sweep mode. If the [StpState] soft key is
not displayed, press the [ ▼ 2/2] soft key on the right end to switch the soft key sets.
In the case of gated single-shot sweep, the state is the stop value oscillation state results. To
stop the oscillation, press the [Stop] soft key.

q) To output sweep sync signal, sweep marker signal, sweep X drive signal → Sync
output settingThis setting is done with [SyncOut] (sync output) on the 3rd page of the setting screen. Oneof the following four settings can be chosen.
• Signal synchronized with reference phase of the waveform [Sync]• Signal synchronized with sweep [SwpSync]• Signal combining marker signal with signal synchronized with sweep [SwpSync+Mkr]• X drive signal of sweep [X-Drive]■ When [Sync] is selected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/
sub-output terminal.
■ When [SwpSync] is selected
A TTL level signal synchronized with sweep is output from the sync/sub-output terminal.
This signal changes from high to low at sweep start.
When the signal being swept is observed with an oscilloscope, it can be used as the trigger
signal for the oscilloscope.
■ When [SwpSync+Mkr] is selected
The leading edge of the sweep sync output is used as the marker signal. During the intervalfrom the sweep start value to the marker value, the sweep sync output is low. The sweep
sync output does not change over the shuttle sweep course.
It is possible to know the timing at which the signal during sweep execution passes themarker value.
Note that the time width when the sweep sync output is low is limited as follows.
• The time width is limited to about 0.05% to 99.95% of the sweep time. Therefore, whenthe marker value is close to the start value or the stop value, the time width will notchange even if the marker value is changed.
• The resolution of the time width is limited to either 1/32,768 of the sweep time or 8.33 ns,
whichever is longer. Therefore, even if the marker value is changed finely, the time width
may not always change.
■ When [X-Drive] is selected
A signal of 0 to +3 V/open corresponding to the sweep value is output from the sync/suboutput terminal. The voltage changes linearly proportionally to the elapsed sweep time.
Even if [Log-OneWay] or [Log-Shuttle] is selected as the log for the sweep function during
frequency sweep, the voltage changes linearly proportionally to the elapsed sweep time.
When the signal during sweep execution is observed with an X-Y display oscilloscope or X-Y
recorder, it can be used as the X-axis signal.

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4.8 Sweep Setting and Manipulation

The relationships between the sweep values and the various signals are shown in thefollowing figure. When stop value < start value, the slope of the sweep X drive output is the
opposite of that in the figure.
Continuous sweep
One way
Marker value

Sweep value

ShuttleStop value

Start value

Stop valueMarker value

Start value

Sweep sync
signal SwpSync(marker disabled)

Low during
the 1st halfof intervalfrom startvalue tostop value

Sweep sync signal
SwpSync+Mkr(marker enabled)

Low from
start value tomarker value

Low from startvalue to stopvalue

Low from
start value tomarker value

Low from
start value tomarker value+3 V
Sweep X drive
signal X-Drive
0V

Sweep time

Sweep time

Sweep timeSingle-shot sweep, gated single-shot sweep
One way
Marker value

Sweep value

ShuttleStop value

Start valueMarker value

Stop value

Start value

Sweep sync
signal SwpSync(marker disabled)

Low during
the 1st halfof intervalfrom startvalue tostop value

Low from startvalue to stop
value

Sweep sync signal
SwpSync+Mkr(marker enabled)

Low from
start value tomarker value

Low from
start value tomarker value
+3 V

+3 V

Sweep X drive
signal X-Drive
0V

0V
Sweep time

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4. BASIC OPERATIONr) To substitute center value to marker value, or substitute marker value to center
value
When the [Ctr ⇒ Mkr] soft key on the 2nd page of the setting screen is pressed, the center
value is substituted to the marker value. When the [Mkr ⇒ Ctr] soft key is pressed, themarker value is substituted to the center value.
When these soft keys are not displayed on the 2nd page of the setting screen, press the[ ▼ 1/2] soft key on the right end to switch the soft key sets.

s) To control sweep start, stop, and pause with external logic signal
When [ExtCtrl] (external control) on the 3rd page of the setting screen is set to [Enable],
sweep manipulation through TTL level logic input to the multi-I/O connector on the rear
panel can be done. This applies in common to CH1 and CH2.
To prevent malfunction due to external noise, it is recommended to set [Disable] (disable)
when not using control with an external signal.
For the pin number allocation, ) p. 18.
The following manipulations can be done.
■ Sweep startIf sweep operation is currently stopped, the sweep operation starts from the beginning upon
input of a falling edge.
During sweep execution, the sweep operation is resumed from the beginning upon input of afalling edge.
During single-shot sweep and gated single-shot sweep, the sweep operation starts from the
beginning if a trigger other than this signal is received. ORing with the set trigger source isdone.
■ Sweep stop
The sweep operation stops upon input of a falling edge during sweep execution, and thestate becomes the sweep start value output state.
However, during single sweep and gated single sweep, the sweep operation starts again
from the beginning upon receipt of a new trigger.
■ Sweep hold/resume
The sweep operation is held upon input of a falling edge during sweep execution. The sweep
operation resumes from where it was held upon input of a rising edge during hold.
However, during single-shot sweep and gated single-shot sweep, the sweep operation starts
again from the beginning upon receipt of a new trigger during hold.

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4.8 Sweep Setting and Manipulation

4.8.4 Setting frequency sweep
For the manipulation methods that are common with the sweep setting screen, refer to
pp. 83 and 86.

a) Frequency sweep example
The following is an example of continuous, linear shuttle sweep.
Shuttle sweep
Stop value
Sweep value
Start value

Sweep time

Sweep time

Output signalb) Selecting frequency sweep

Select [Freq] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Sweep] (sweep), set [Type] (sweep type)on the 2nd page of the setting screen to[Freq] (frequency).

c) Waveforms for which frequency sweep is not possible
Frequency sweep is not possible for noise, pulse wave, and DC.

d) Setting items required for frequency sweep
Set the following items on the 2nd page of the setting screen. The frequency settings on the
1st page of the setting screen are disabled.
• Start frequency [Start]
The frequency range depends on the waveform.
• Stop frequency [Stop]
The frequency range depends on the waveform.
• Sweep time [Time]
This is the transition time from the start frequency to the stop frequency. ) p. 87• Sweep mode [SwpMode]
Continuous, single-shot, and gated single-shot can be chosen from. ) p. 87• Sweep function [SwpFctn]
One-way/shuttle, and linear/log can be chosen from. ) p. 86
Setting with [Center] (center frequency) and [Span] (span frequency) instead of the startfrequency and stop frequency is also possible. ) p. 86
When the sweep mode is single-shot or gated single-shot, [Trig] (trigger condition) must be
set. ) p. 90

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Set the following items as needed.
• Marker frequency [Marker] (2nd page of setting screen) ) p. 92• Stop level [StpLvl] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• External control with multi-I/O connector [ExtCtrl] (3rd page of setting screen) ) p. 94• Oscillation stop unit for gated single-shot sweep [OscStop] (3rd page of setting screen)) p. 89
This setting can be used only for gated single-shot sweep.
• Sync output [SyncOut] (3rd page of setting screen) ) p. 92

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4.8 Sweep Setting and Manipulation

4.8.5 Setting phase sweep
For the manipulation methods that are common with the sweep setting screen, refer to
pp. 83 and 86.

a) Phase sweep example
The following is an example of continuous, linear shuttle sweep.
Shuttle sweep
Stop value
Sweep value
Start value

Sweep time

Sweep time

Output signal

As the phase increases, the frequency rises by the value below, and as the phase decreases,
the frequency drops by the value below.
｜ Stop phase (deg)－Start phase (deg) ｜

360

×

1
Sweep time (s)b) Selecting phase sweep

Select [Phase] in[Type] and thenpress the ENTER
key.

When [Mode] (oscillation mode) is set to[Sweep] (sweep), set [Type] (sweep type)on the 2nd page of the setting screen to[Phase] (phase).

c) Waveforms for which phase sweep is not possible
Phase sweep is not possible for noise and DC.

d) Setting items required for phase sweep
Set the following items on the 2nd page of the setting screen. The phase settings on the 1st
page of the setting screen are disabled.
• Start phase [Start]• Stop phase [Stop]• Sweep time [Time]
This is the transition time from the start phase to the stop phase. ) p. 87• Sweep mode [SwpMode]
Continuous, single-shot, and gated single-shot can be chosen from. ) p. 87

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4. BASIC OPERATION• Sweep function [SwpFctn]
One-way/shuttle can be chosen from. ) p. 86
Setting with [Center] (center phase) and [Span] (span phase) instead of the start phase andstop phase is also possible. ) p. 86
When the sweep mode is single-shot or gated single-shot, [Trig] (trigger condition) must be
set. ) p. 90
Set the following items as needed.
• Marker phase [Marker] (2nd page of setting screen) ) p. 92• Stop level [StpLvl] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• External control with multi-I/O connector [ExtCtrl] (3rd page of setting screen) ) p. 94• Oscillation stop unit for gated single-shot sweep [OscStop] (3rd page of setting screen)) p. 89
This setting can be used only for gated single sweep.
• Sync output [SyncOut] (3rd page of setting screen) ) p. 92

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4.8 Sweep Setting and Manipulation

4.8.6 Setting amplitude sweep
For the manipulation methods that are common with the sweep setting screen, refer to
pp. 83 and 86.

a) Amplitude sweep example
The following is an example of continuous, linear shuttle sweep.
Shuttle sweep
Stop value
Sweep value
Start value

Sweep time

Sweep time

Output signalb) Selecting amplitude sweep

Select [Amptd] in[Type] and thenpress the ENTER
key

When [Mode] (oscillation mode) is set to[Sweep] (sweep), set [Type] (sweep type)on the 2nd page of the setting screen to[Amptd] (amplitude).

c) Waveforms for which amplitude sweep is not possible
Amplitude sweep is not possible for DC.

d) Setting items required for amplitude sweep
Set the following items on the 2nd page of the setting screen. The amplitude settings on the
1st page of the setting screen are disabled.
• Start amplitude [Start]• Stop amplitude [Stop]• Sweep time [Time]
This is the transition time from the start amplitude to the stop amplitude. ) p. 87• Sweep mode [SwpMode]
Continuous, single-shot, and gated single-shot can be chosen from. ) p. 87• Sweep function [SwpFctn]
One-way/shuttle can be chosen from. ) p. 86
Setting with [Center] (center amplitude) and [Span] (span amplitude) instead of the start
amplitude and stop amplitude is also possible. ) p. 86
When the sweep mode is single-shot or gated single-shot, [Trig] (trigger condition) must be
set. ) p. 90

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Set the following items as needed.
• Marker amplitude [Marker] (2nd page of setting screen) ) p. 92• Stop level [StpLvl] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• External control with multi-I/O connector [ExtCtrl] (3rd page of setting screen) ) p. 94• Oscillation stop unit for gated single sweep [OscStop] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• Sync output [SyncOut] (3rd page of setting screen) ) p. 92

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4.8 Sweep Setting and Manipulation

4.8.7 Setting DC offset sweep
For the manipulation methods that are common with the sweep setting screen, refer to
pp. 83 and 86.

a) DC offset sweep example
The following is an example of continuous, linear shuttle sweep.
Shuttle sweep
Stop value
Sweep value
Start value

Sweep time

Sweep time

Output signalb) Selecting DC offset sweep

Select [Offset] in[Type] and thenpress the ENTER
key.

When [Mode] (oscillation mode) is set to[Sweep] (sweep), set [Type] (sweep type)on the 2nd page of the setting screen to[Offset] (DC offset).

c) Waveforms for which DC offset sweep is not possible
None. DC offset sweep is possible for all waveforms. However, when DC is selected as the
waveform, the DC level itself becomes the sweep object. Moreover, when DC is selected as
the waveform, gated single-shot sweep cannot be done.

d) Setting items required for DC offset sweep
Set the following items on the 2nd page of the setting screen. The DC offset settings on the
1st page of the setting screen are invalid.
• Start DC offset [Start]• Stop DC offset [Stop]• Sweep time [Time]
This is the transition time from start DC offset to stop DC offset. ) p. 87• Sweep mode [SwpMode]
Continuous, single-shot, and gated single-shot can be chosen from. ) p. 87• Sweep function [SwpFctn]
One-way/shuttle can be chosen from. ) p. 86
Setting with [Center] (center DC offset) and [Span] (span DC offset) instead of start DC
offset and stop DC offset is also possible. ) p. 86
When the sweep mode is single-shot or gated single-shot, [Trig] (trigger condition) must be
set. ) p. 90

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4. BASIC OPERATION

Set the following items as needed.
• Marker DC offset [Marker] (2nd page of setting screen) ) p. 92• Stop level [StpLvl] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• External control with multi-I/O connector [ExtCtrl] (3rd page of setting screen) ) p. 94• Oscillation stop unit for gated single sweep [OscStop] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• Sync output [SyncOut] (3rd page of setting screen) ) p. 92

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4.8 Sweep Setting and Manipulation

4.8.8 Setting duty sweep
For the manipulation methods that are common with the sweep setting screen, refer to
pp. 83 and 86.

a) Duty sweep example
The following is an example of continuous, linear shuttle sweep.
Shuttle sweep
Stop value
Sweep value
Start value

Sweep time

Sweep time

Output signalb) Selecting duty sweep

Select [Duty] in[Type] and thenpress the ENTER
key.

When [Mode] (oscillation mode) is set to[Sweep] (sweep), set [Type] (sweep type)on the 2nd page of the setting screen to[Duty] (duty).

c) Waveforms for which duty sweep is not possible
Duty sweep is possible only for square and pulse waves.

d) Setting items required for duty sweep
Set the following items on the 2nd page of the setting screen. The duty settings on the 1st
page of the setting screen are disabled.
• Start duty [Start]
The duty range depends on the frequency. In the case of a pulse wave, it also depends on
the leading edge time and the trailing edge time. ) pp. 60, 63• Stop duty [Stop]
The duty range depends on the frequency. In the case of a pulse wave, it also depends on
the leading edge time and the trailing edge time. ) pp. 60, 63• Sweep time [Time]
This is the transition time from the start duty to the stop duty. ) p. 87• Sweep mode [SwpMode]
Continuous, single-shot, and gated single-shot can be chosen from. ) p. 87• Sweep function [SwpFctn]
One-way/shuttle can be chosen from. ) p. 86
Setting with [Center] (center duty) and [Span] (span duty) instead of the start duty and stop
duty is also possible. ) p. 86

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When the sweep mode is single-shot or gated single-shot, [Trig] (trigger condition) must be
set. ) p. 90
Set the following items as needed.
• Marker duty [Marker] (2nd page of setting screen) ) p. 92• Stop level [StpLvl] (3rd page of setting screen) ) p. 89
This setting can be used only for gated single-shot sweep.
• External control with multi-I/O connector [ExtCtrl] (3rd page of setting screen) ) p. 94• Oscillation stop unit for gated single-shot sweep [OscStop] (3rd page of setting screen)) p. 89
This setting can be used only for gated single-shot sweep.
• Sync output [SyncOut] (3rd page of setting screen) ) p. 92

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4.9 Burst Setting and Manipulation

4.9

Burst Setting and Manipulation

4.9.1 Burst oscillation types
The following four types of burst oscillation can be done.
• Auto burst
Oscillation and stop are automatically repeated with the respectively specified wave
number. No trigger signal is required. ) p. 106• Trigger burst
Oscillation with the specified wave number is done each time a trigger is received.
) p. 109• Gate oscillation
Oscillation is done in integer cycles or half cycles while the gate is on. ) p. 113• Triggered gate oscillation
This is gate oscillation that switches the gate on/off each time a trigger is received.
) p. 118

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4. BASIC OPERATION

4.9.2 Auto burst
Oscillation and stop are automatically repeated with the respectively specified wave
number. No trigger signal is required.
Settings and manipulations are done on the Oscillator setting screen. “Oscillator” isdisplayed at the top left of the Oscillator setting screen. When another screen is displayed,pressing the MENU MENU key displays the top menu, so select [Oscillator] and then press
the ENTER ENTER key.

a) Auto burst example
The following example is for mark wave number (oscillation wave number) = 3, space wave
number (oscillation stop wave number) = 2, oscillation start/stop phase = 30°, stop level =off.
Oscillation start/stop phase
30°

Mark wave
number: 3
Oscillation

Oscillation phase continues even during stop

Space wave
number: 2
Stopb) Setting the oscillation mode to auto burst

Select [Burst] in[Mode] and thenpress the ENTER
key

Select [Auto] in[BrstMode] andthen press the
ENTER key106

Set [Mode] (oscillation mode) to [Burst] on
the Oscillator setting screen. The oscillation mode is switched to the burst
oscillation mode as a result.
In the burst oscillation mode, the setting
screen consists of two pages, which canbe toggled with the NEXT NEXT key.
Next, set [BrstMode] (burst mode) to[Auto] (auto) on the 2nd page of the burst
oscillation mode.

MULTIFUNCTION GENERATOR

4.9 Burst Setting and Manipulationc) Auto burst setting screen■ 1st page: Screen for the basic parameters
These are the common setting items that are common to all the oscillation modes.
Indicates that the 1st pageis displayed

Set the oscillation
mode to [Burst]

Press the NEXT
key to display
the 2nd page

Oscillation start/stop
phase setting

Oscillation start/stop phase [Phase]This is the phase at which oscillation starts and stops.
■ 2nd page: Screen for the auto burst settings
Indicates that the 2nd
page is displayedMark wave number

Set burst mode to[Auto]Space wave number
Stop level

Sync output

Press the NEXT
key to display
the 1st page

Mark wave number [Mark]This is the wave number for oscillation. It can be set in 0.5-cycle units. Normally, it isset in 1-cycle units.
Space wave number [Space]
This is the wave number for oscillation stop. It can be set in 0.5-cycle units. Normally, it
is set in 1-cycle units.
Stop level [StpLvl]
This is the signal level during oscillation stop. The level can be set to either off or on.
Normally, it is set to off. ) p. 108
Sync output [SyncOut]
This is the output signal from the sync/sub-output terminal. Waveform reference phasesynchronization and burst synchronization can be chosen from. ) p. 108d) Waveforms for which auto burst is not possible
Auto burst is not possible for noise and DC.

e) Setting items required for auto burst
Set [Phase] (oscillation start/stop phase) on the 1st page of the setting screen.
Set [Mark[ (mark wave number) and [Space] (space wave number) on the 2nd page of thesetting screen.
Each wave number is normally set to an integer value.
[StpLvl] (stop level) on the 2nd page of the setting screen is normally set to [Off] (off). ) p. 108

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4. BASIC OPERATIONf) To start auto burst → Automatically starts
When, in the auto burst mode, the mode is set to the burst oscillation mode, burst starts
automatically.
However, if the burst setting is improper, burst oscillation will not start. ([Conflict!] isdisplayed in the top right part of the screen.) When the [?] soft key appearing at the left end
is pressed, a message about the inappropriate setting is displayed. Once the setting has
been changed to an appropriate setting, burst oscillation starts.

g) Stopping auto burst → Not possible
Oscillation cannot be stopped in the auto burst mode as is.
To stop oscillation, set [BrstMode] (burst mode) on the 2nd page of the setting screen to asetting other than [Auto] (auto), and then set so that no trigger or gate signal is input. ) p.
111
To set continuous oscillation, change [Mode] (oscillation mode) to [Continuous].

h) To output burst sync signal: Sync output setting
Set burst sync signal with [SyncOut] (sync output) on the 2nd page of the setting screen.
One of the following two settings can be selected.
• Signal synchronized with the reference phase of the waveform [Sync]• Signal synchronized with burst oscillation [BrstSync]■ When [Sync] is selected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/
sub-output terminal.
■ When [BrstSync] is selected
A TTL level signal synchronized with the burst oscillation is output from the sync/suboutput terminal. As shown in the following figure, this signal is low during oscillation andhigh during oscillation stop.
When the signal during burst is observed with an oscilloscope, it can be used as the trigger
signal for the oscilloscope.
Burst sync signal

Oscillation

Stop

Oscillation

Stop

Output signali) Usage of stop level
The level when oscillation is stopped is normally set with the oscillation start/stop phase,
but it can also be set independently from that with a proportion of the amplitude full scale.
Set [StpLvl] (stop level) on the 2nd page of the setting screen to [On] and set the level with a% value. ) p. 112

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4.9.3 Trigger burst
Oscillation with the specified wave number is done each time a trigger is received.
Settings and manipulations are done on the Oscillator setting screen. “Oscillator” isdisplayed at the top left of the oscillator setting screen. When another screen is displayed,pressing the MENU MENU key displays the top menu, so select [Oscillator] and then press
the ENTER ENTER key.

a) Trigger burst example
The following example is for mark wave number (oscillation wave number) = 4, oscillation
start/stop phase = 30°, stop level = off.
Oscillation start/stop phase30°
Trigger signal

Output signal

Triggerdelay time

Triggerdelay time

No new trigger acceptedin this intervalb) Setting the oscillation mode to trigger burst

Select [Burst] in[Mode] and thenpress the ENTER
key.

Set [Mode] (oscillation mode) to [Burst] on
the Oscillator setting screen. The oscillation mode is switched to the burst oscillation mode as a result.
In the burst oscillation mode, the setting
screen consists of two pages, which canbe toggled with the NEXT NEXT key.
Next, set [BrstMode] (burst mode) on the
2nd page of the burst oscillation modesetting screen to [Trigger] (trigger burst).

Select [Trigger] in[BrstMode] andthen press the
ENTER key

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4. BASIC OPERATIONc) Trigger burst setting screen■ 1st page: Screen for the basic parameters
These are the common setting items that are common to all the oscillation modes.
Indicates that the 1st pageis displayed

Set the oscillation
mode to [Burst].

Press the NEXT
key to display
the 2nd page

Oscillation start/stop
phase setting

Oscillation start/stop phase [Phase]This is the phase at which oscillation starts and stops.
■ 2nd page: Screen for the trigger burst settings
Indicates that the 2nd
page is displayedMark wave number
Stop level
Trigger
Sync output

Set burst mode to[Trigger]
Trigger delay
Press the NEXT
key to display
the 1st page

Mark wave number [Mark]This is the wave number for oscillation each time a trigger is received. It can be set in
0.5-cycle units.
Stop level [StpLvl]
This is the signal level during oscillation stop. The level can be set to either off or on.
Normally, it is set to off. ) p. 112
Trigger [Trig]
This is the trigger condition. Internal and external can be chosen as the trigger source.
) p. 111
Trigger delay [TrigDly]
This is the trigger delay time. Upon receipt of a trigger, oscillation starts following thelapse of the specified time. ) p. 111
Sync out [SyncOut]
This is the output signal from the sync/sub-output terminal. Waveform reference phasesynchronization and burst synchronization can be chosen from. ) p. 111d) Waveforms for which trigger burst is not possible
Trigger burst is not possible for noise and DC.

e) Setting items required for trigger burst
On the 1st page of the setting screen, set [Phase] (oscillation start/stop phase).
On the 2nd page of the setting screen, set [Mark] (mark wave number). Normally, the wave

110

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4.9 Burst Setting and Manipulation

number is set to an integer value.
[StpLvl] (stop level) on the 2nd page of the setting screen is normally set to [Off] (off). ) p. 112
A trigger is required for trigger burst. Refer to the following item.

f) Trigger settings for trigger burst
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
key manipulation, and remote trigger manipulation.
Upon receipt of a trigger, the TRIG’D lamp next to the MAN TRIG key lights.
The trigger source is set with [Trig] (trigger) on the 2nd page of the setting screen.
■ Trigger source setting
The trigger source can be chosen from [Int] (internal) and [Ext] (external).
When the trigger source is [Int] (internal), the trigger period can be set.
When the trigger source is [Ext] (external), the trigger polarity can be set.
If the trigger source is set to [Ext] (external), a TTL level trigger signal is input to theexternal trigger input terminal (TRIG IN).
■ Usage of manual trigger and remote trigger
Manual trigger manipulation and remote trigger manipulation are always effective
regardless of the trigger source setting.
The

MAN TRIGMAN TRIG key can be used for manual trigger manipulation.

Note that, in the case of the WF1974, the MAN TRIG key works for the channel whose
display is active.
For details on the channel whose display is active, ) p. 38.
To use only manual trigger manipulation and remote trigger manipulation as the trigger,
set the trigger source to [Ext] (external). Also, to prevent malfunction due to external noiseat this time, it is recommended to set the polarity to [Off].
■ Trigger delay setting
Set the trigger delay time with [TrigDly] (trigger delay) on the 2nd page of the setting
screen. Upon receipt of a trigger, oscillation starts following the lapse of the specified time.
The trigger delay time setting is valid both for internal and external. Set the trigger delay
time for the internal trigger source to 0. The trigger delay time setting is invalid for amanual trigger and a remote trigger.
When the trigger delay time setting is zero, the delay within the unit is minimal, but the
waveform that is actually output contains a delay. ) p. 140
Following receipt of a trigger, no new trigger is accepted until the oscillation of the specified
mark wave number has been completed.

g) To start trigger burst → Trigger
Upon receipt of a trigger, oscillation of the specified wave number is performed.
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
manipulation, and remote trigger manipulation.

h) To output burst sync signal → Sync output settingThis setting is done with [SyncOut] (sync output) on the 2nd page of the setting screen. Oneof the following two settings can be selected.
• Signal synchronized with the reference phase of the waveform [Sync]• Signal synchronized with burst oscillation [BrstSync]

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4. BASIC OPERATION■ When [Sync] is selected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/
sub-output terminal.
■ When [BrstSync] is selected
A TTL level signal synchronized with the burst oscillation is output from the sync/suboutput terminal. As shown in the following figure, this signal is low during oscillation andhigh during oscillation stop.
When the signal during burst is observed with an oscilloscope, it can be used as the trigger
signal for the oscilloscope.
Burst sync signal

Oscillation

Stop

Oscillation

Stop

Output signali) Usage of stop level
The level when oscillation is stopped is normally set with the oscillation start/stop phase,
but it can also be set independently from that with a proportion of the amplitude full scale.
Set [StpLvl] (stop level) on the 2nd page of the setting screen to [On] (on) and set the levelwith a % value.
The following examples are for mark wave number = 3, oscillation start/stop phase = 30°,stop level = off, and −50% when on. Note that the oscillation start/stop phase remains valid.
Oscillation start/stop phase: 30°

Stop level off

Oscillation start/stop phase: 30°

Stop level: –50%

Stop level on

When the stop level is applied to a square waveform, a 3-value square waveform can be
output, as shown in the following figure. In the example presented in this figure, the stoplevel is set to 0%, and the oscillation start/stop phase to 0°. (Either the normal or extended
variable duty range may be used.) If the stop level is not applied, the level of the square
waveform during oscillation stop is either to low level or high level.

112

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4.9 Burst Setting and Manipulation

4.9.4 Gate oscillation
Oscillation is done in integer cycles or half cycles while the gate is on.
The settings and manipulations are done on the Oscillator setting screen. “Oscillator” isdisplayed at the top left of the Oscillator setting screen. When another screen is displayed,pressing the MENU MENU key displays the top menu, so select [Oscillator] and then press
the ENTER ENTER key.

a) Gate oscillation example
The following example is for oscillation start/stop phase = 30°, oscillation stop unit = 1 cycle,
stop level = off.
After the gate signal becomes off, oscillation stops once the oscillation start/stop phase isreached.
Gate signal

Gate onGate off

Gate onGate off

Output signal

Oscillation start/stop phase: 30°b) Setting the oscillation mode to gate oscillation

Select [Burst] in[Mode] and thenpress the ENTER
key

Select [Gate] in[BrstMode] andthen press the
ENTER key

WF1973/WF1974

Set [Mode] (oscillation mode) to [Burst](burst) on the Oscillator setting screen.
The oscillation mode is switched to theburst oscillation mode as a result. In the
burst oscillation mode, the setting screen
consists of two pages, which can be
toggled with the NEXT NEXT key.
Next, set [BrstMode] (burst mode) on the
2nd page of the burst oscillation modesetting screen to [Gate] (gate oscillation).

113

4. BASIC OPERATIONc) Gate oscillation setting screen■ 1st page: Screen for the basic parameters
These are the common setting items that are common to all the oscillation modes.
Indicates that the 1st pageis displayed

Set the oscillation
mode to [Burst]

Press the NEXT
key to display
the 2nd page

Oscillation start/stop
phase setting

Oscillation start/stop phase [Phase]This is the phase at which oscillation starts and stops.
■ 2nd page: Screen for the gate oscillation settings
Indicates that the 2nd
page is displayed
Set burst mode to[Gate].

Stop level
Trigger
Sync output Oscillation stop unit
Sync output

Press the NEXT
key to display
the 1st page

Stop level [StpLvl]
This is the signal level during oscillation stop. The level can be set to either off or on.
Normally, it is set to off. ) p. 116
Trigger [Trig]
This is the trigger condition (gate condition). Internal and external can be chosen as thetrigger source. ) p. 115
Oscillation stop unit [OscStop]
This is the oscillation stop unit. One cycle and 0.5 cycles can be chosen from. Normally,
1 cycle is set. ) p. 116
Sync output [SyncOut]
This is the output signal from the sync/sub-output terminal. Waveform reference phasesynchronization and burst synchronization can be chosen from. ) p. 115d) Waveforms for which auto burst is not possible
Gate oscillation is not possible for DC.
Gate oscillation can be done for noise, but the operation differs from that of otherwaveforms. ) p. 117e) Setting items required for gate oscillation
On the 1st page of the setting screen, set [Phase] (oscillation start/stop phase).
Normally, set [StepLvl] (stop level) on the 2nd page of the setting screen to [Off]. ) p. 116
Set [OscStop] (oscillation stop unit) on the 2nd page of the setting screen to [Cycle] (1 cycle)

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4.9 Burst Setting and Manipulation

normally. ) p. 116
A trigger (gate) is required for gate oscillation. Refer to the following item.

f) Trigger (gate) settings for gate oscillation
The trigger (gate) can be selected from internal trigger oscillator, external signal, manualtrigger key manipulation, and remote trigger manipulation.
While the gate signal is on, the TRIG’D lamp next to the MAN TRIG key lights.
The trigger source is set with [Trig] (trigger) on the 2nd page of the setting screen. The
trigger delay is fixed to minimum.
■ Trigger source setting
The trigger source can be chosen from [Int] (internal) and [Ext] (external).
When the trigger source is [Int] (internal), the trigger period can be set. At this time, thegate signal is a square wave with 50% duty.
When the trigger source is [Ext] (external), the trigger polarity can be set.
If the trigger source is set to [Ext] (external), a TTL level trigger signal is input to theexternal trigger input terminal (TRIG IN).
■ Usage of manual trigger and remote trigger
Manual trigger manipulation and remote trigger manipulation are always valid regardlessof the trigger source setting.
The

MAN TRIGMAN TRIG key can be used for manual trigger manipulation.

The gate signal is on while the MAN TRIG key is pressed. However, in the case of theWF1974, the MAN TRIG key works for the channel whose display is active.
For details on the channel whose display is active, ) p. 38.
To use only manual trigger manipulation and remote trigger manipulation as the trigger,
set the trigger source to [Ext] (external). Also, to prevent malfunction due to external noiseat this time, it is recommended to set the polarity to [Off].

g) To start gate oscillation → Trigger (gate signal)
Oscillation is executed upon reception of gate signal on.
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
manipulation, and remote trigger manipulation.

h) To output the burst sync signal → Sync output settingThis setting is done with [SyncOut] (sync output) on the 2nd page of the setting screen. Oneof the following two settings can be selected.
• Signal synchronized with the reference phase of the waveform [Sync]• Signal synchronized with burst oscillation [BrstSync]■ When [Sync] is selected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/
sub-output terminal.

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4. BASIC OPERATION■ When [BrstSync] is selected
A TTL level signal synchronized with the gate oscillation is output from the sync/sub-output
terminal. As shown in the following figure, this signal is low during oscillation and highduring oscillation stop. Note that this differs from the gate signal.
When the signal during burst is observed with an oscilloscope, it can be used as the trigger
signal for the oscilloscope.
Gate signal

Gate onGate off

Oscillation

Burst sync signal

Stop

Gate onGate off

Oscillation

Stop

Output signali) To execute oscillation in half-cycle units → Set oscillation stop unit to half cycle
To stop oscillation in half-cycle units, set [OscStop] (oscillation stop unit) on the 2nd page ofthe setting screen to [HalfCycle] (half cycle). Normally [Cycle] (1 cycle) is set. When [Cycle](1 cycle) is set, oscillation is done in integer cycles.
The next figure compares oscillation done using 1 cycle and half cycle as the oscillation stop
unit, under the following conditions: oscillation start/stop phase = 30°, stop level = off.
In the case of 1-cycle units, following gate off, oscillation stops once the oscillation start/stop
phase is reached.
In the case of the half-cycle unit, following gate off, the oscillation stops once the oscillation
start/stop phase or [oscillation start/stop phase + 180° (or − 180°)] is reached, and then theoscillation start/stop phase is transited to.
Gate signal

Gate onGate off

Gate onGate off

Oscillation in
1-cycle units
Oscillation start/stop
phase: 30°

Oscillation stopat 210°

Oscillation in
half-cycle unitsj) Usage of stop level
The level when oscillation is stopped is normally set with the oscillation start/stop phase,
but it can also be set independently from that with a proportion of the amplitude full scale.
Set [StpLvl] (stop level) on the 2nd page of the setting screen to [On] (on) and set the levelwith a % value. ) p. 112

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4.9 Burst Setting and Manipulationk) Noise gate oscillation
Noise having no cycle, the gate-on period is the oscillation period, and the gate-off period is
the oscillation stop period. Further, since noise has no phase, the stop level setting is always
enabled.
The next figure is an example of noise gate oscillation when the stop level is 0%.
Gate signal

Gate onGate off

Gate onBurst sync signal

Oscillation

Stop

Oscillation

Signal output

Stop level: 0%

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4. BASIC OPERATION

4.9.5 Triggered gate oscillation
Triggered gate oscillation is gate oscillation that switches the gate on/off each time a trigger
is received.
The settings and manipulations are done on the Oscillator setting screen. “Oscillator” isdisplayed at the top left of the Oscillator setting screen. When another screen is displayed,press the MENU MENU key to display the top menu, then select [Oscillator] and press the
ENTER ENTER key.

a) Triggered gate oscillation example
The following example is for oscillation start/stop phase = 30°, oscillation stop unit = 1 cycle,
stop level: off.
After the gate signal becomes off, oscillation stops once the oscillation start/stop phase isreached.
Trigger signal

Internal gate signal

Gate onGate off

Gate onGate off

Output signal

Oscillation start/stop phase: 30°b) Setting the oscillation mode to triggered gate oscillation

Select [Burst] in[Mode] and thenpress the ENTER
key

Select [TrigGate] in[BrstMode] andthen press the
ENTER key118

Set [Mode] (oscillation mode) to [Burst] on
the oscillator setting screen. The oscillation mode is switched to the burst oscillation mode as a result. In the burst oscillation mode, the setting screen consists of
two pages, which can be toggled with theNEXT NEXT key.
Next, set [BrstMode] (burst mode) on the
2nd page of the burst oscillation modesetting screen to [TrigGate] (triggered gateoscillation).

MULTIFUNCTION GENERATOR

4.9 Burst Setting and Manipulationc) Triggered gate oscillation setting screen■ 1st page: Screen for the basic parameters
These are the common setting items that are common to all the oscillation modes.
Indicates that the 1st pageis displayed

Set the oscillation
mode to [Burst]

Press the NEXT
key to display
the 2nd page

Oscillation start/stop
phase setting

Oscillation start/stop phase [Phase]This is the phase at which oscillation starts and stops.
■ 2nd page: Screen for the triggered gate oscillation settings
Indicates that the 2nd
page is displayed
Set burst mode to[TrigGate]

Stop level
Trigger
Oscillation stop unit
Sync output

Press the NEXT
key to display
the 1st page

Stop level [StpLvl]
This is the signal level during oscillation stop. The level can be set to either off or on.
Normally, it is set to off. ) p. 121
Trigger [Trig]
This is the trigger condition.
Internal and external can be chosen as the trigger source. ) p. 120
Oscillation stop unit [OscStop]
This is the oscillation stop unit. A choice can be made between 1-cycle unit and 0.5-cycle
units. Normally, 1-cycle unit is set. ) p. 121
Sync output [SyncOut]
This is the output signal from the sync/sub-output terminal. Waveform reference phasesynchronization and burst synchronization can be chosen from. ) p. 120d) Waveforms for which triggered gate oscillation is not possible
Gate oscillation is not possible for DC.
Gate oscillation can be done for noise, but the operation differs from that of otherwaveforms. ) p. 121e) Setting items required for triggered gate oscillation
Set [Phase] (oscillation start/stop phase) on the 1st page of the setting screen.
[StepLvl] (stop level) on the 2nd page of the setting screen is set to [Off] normally. ) p. 121[OscStop] (oscillation stop unit) on the 2nd page of the setting screen is set to [Cycle] (1WF1973/WF1974

119

4. BASIC OPERATION

cycle) normally. ) p. 121
A trigger is required for triggered gate oscillation. Refer to the following item.

f) Trigger settings for triggered gate oscillation
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
key manipulation, and remote trigger manipulation.
Upon receipt of a trigger, the TRIG’D lamp next to the MAN TRIG key lights.
The trigger source is set with [Trig] (trigger) on the 2nd page of the setting screen. The
trigger delay is fixed to minimum.
■ Trigger source setting
The trigger source can be chosen from [Int] (internal) and [Ext] (external).
When the trigger source is [Int] (internal), the trigger period can be set.
When the trigger source is [Ext] (external), the trigger polarity can be set.
If the trigger source is set to [Ext] (external), a TTL level trigger signal is input to theexternal trigger input terminal (TRIG IN).
■ Usage of manual trigger and remote trigger
Manual trigger manipulation and remote trigger manipulation are always valid regardlessof the trigger source setting.
The

MAN TRIGMAN TRIG key can be used for manual trigger manipulation.

However, in the case of the WF1974, the MAN TRIG key works for the channel whose
display is active.
For details on the channel whose display is active, ) p. 38.
To use only manual trigger manipulation and remote trigger manipulation as the trigger,
set the trigger source to [Ext] (external). Also, to prevent malfunction due to external noiseat this time, it is recommended to set the polarity to [Off].

g) To start triggered gate oscillation → Trigger
Oscillation is executed upon reception of a trigger if the internal gate signal is on.
The trigger can be selected from internal trigger oscillator, external signal, manual trigger
manipulation, and remote trigger manipulation.

h) To output the burst sync signal → Sync output settingThis setting is done with [SyncOut] (sync output) on the 2nd page of the setting screen. Oneof the following two settings can be selected.
・Signal synchronized with the reference phase of the waveform [Sync]
・Signal synchronized with burst oscillation [BrstSync]■ When [Sync] is selected
A TTL level signal that rises at the reference phase of the waveform is output from the sync/
sub-output terminal.
■ When [BrstSync] is selected
A TTL level signal synchronized with the gate oscillation is output from the sync/sub-output
terminal. As shown in the following figure, this signal is low during oscillation and highduring oscillation stop. Note that this differs from the gate signal.
When the signal during burst is observed with an oscilloscope, it can be used as the trigger

120

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4.9 Burst Setting and Manipulation

signal for the oscilloscope.
Trigger signal

Internal gate signal

Gate onBurst sync signal

Oscillation

Gate off

Stop

Gate onGate off

Oscillation

Stop

Output signali) To execute oscillation in half-cycle units: Set oscillation stop unit to half cycle
To stop oscillation in half-cycle units, set [OscStop] (oscillation stop unit) on the 2nd page ofthe setting screen to [HalfCycle] (half cycle). Normally [Cycle] (1 cycle) is set. When [Cycle](1 cycle) is set, oscillation is done in integer cycles. ) p. 116j) Usage of stop level
The level when oscillation is stopped is normally set with the oscillation start/stop phase,
but it can also be set independently from that with a proportion of the amplitude full scale.
Set [StpLvl] (stop level) on the 2nd page of the setting screen to [On] (on) and set the levelwith a % value. ) p. 112k) Noise triggered gate oscillation
Noise having no cycle, the gate-on period is the oscillation period, and the gate-off period is
the period stop interval. Further, since noise has no phase, the stop level setting is always
enabled. ) p. 117

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121

5.
5.1

SAVING AND RECALLING SETTINGS

Saving Settings
The current setting conditions can be saved to the setting memory and then recalled for use.
The setting saving operation is done on the Store Memory screen.
The settings when the power supply is cut off/restored are saved to setting memory No. 1.
) p. 24a) Setting saving procedure

1. Press the MENU MENU key to open the top
In the top menu,
select [Store
Memory] andthen press the
ENTER key.

Select [Memory No.] in the top left of the screen and thenpress the ENTER key to open the field for inputting thenumber of the setting memory to which the setting is to besaved
An outline of thesetting in thespecified setting
memory number
is displayed

The specified setting memory number and the setting nameare displayed in highlight

Press the [Store]
soft key to open
the dialog box forchecking thesaving operation

Select [OK] andthen press the
ENTER key tosave the setting

122

menu window. In this window, select[Store Memory] and then press the ENTER
ENTER key to display the Store Memory
screen.

2. On the Store Memory screen, select the[Memory No.] field and then press the
ENTER
ENTER key to open the field for
inputting the number of the setting memory
to which the setting is to be saved.

3. Increment/decrement the setting memory
number with theup/down arrow
keys or themodify knob.
The specified setting memory number andsetting name are displayed in highlight in
the left part of the screen. An outline of thesetting saved to the setting memory of thespecified number is displayed in the rightpart of the screen.

4. Select the number of the setting memory
to which the setting is to be saved andthen press the ENTER ENTER key to close
the setting memory number input field.

5. Press the [Store] soft key to open the
dialog box in which the saving operation
can be checked.
To save the setting, select [OK] and thenpress the ENTER ENTER key. The setting issaved, overwriting any setting previously
saved to this setting memory number.

MULTIFUNCTION GENERATOR

5.1 Saving Settingsb) Restoring the saved contents to the initial settings
Press the [Clear]soft key to open
the dialog box forchecking theinitialization
operation
Select [OK] andthen press the
ENTER key torestore the initial
setting

Similarly to the saving operation, after
setting the setting memory number, press
the [Clear] soft key. This opens the dialog
box for checking the initialization operation.
To perform initialization, select [OK] andthen press the ENTER ENTER key. This
causes the setting contents previously
saved to that setting memory number to be
overwritten with the initial setting contents.

c) Changing the setting memory namePress the[Rename] soft
key to open thesetting memory
name input field

1. Similarly to the saving operation, after
setting the setting memory number, press
the [Rename] soft key to open the setting
memory name input field.

2. Select the digit to be changed with the left/right arrow keys

, and change thecharacter with theup/down arrow keys or themodify knob. Uppercase andlowercase alphabetic characters, numbers, and symbols can be input. Numeric values
can be directly input by using the 0 ... 9 numeric keypad.
Press the [Delete] soft key to delete the character at the cursor position. The character
string to the right of the cursor moves one place left.
Press the [Insert] soft key to insert a space at the cursor position.
Press the [CLR ⇒ ] soft key to delete the character string to the right of the cursor position(cursor position not included).
Press the [Clear] soft key to delete all the characters.
The name may consist of up to 20 characters.

3. Press the [Apply] soft key or the ENTER ENTER key to fix the changed name and close thesetting memory name input field.
When the CANCEL CANCEL key is pressed here, the name remains unchanged and thesetting memory name input field closes.
The setting memory name can also be changed on the Recall Memory screen.

Check
The following characters can be used for the setting memory name.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9! # $ % & ’ ( ) * + , - . / : ; < = > ? @ [ ] \ ^ _ ` { | } ~ space

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5. SAVING AND RECALLING SETTINGS

5.2

Recalling Settings
The setting conditions saved to the setting memory can be recalled for use.
The setting recall operation is done on the Recall Memory screen.
At shipping, the same contents as the initial settings are saved to all the setting memories.

a) Setting recall procedure

1. Press the MENU MENU key to display the
In the top menu,
select [Recall
Memory] andthen press the
ENTER key

Select [Memory No.] in the top left of the screen andthen press the ENTER key to open the field for inputting
the number of the setting memory to be recalled
An outline of thesetting in thespecified setting
memory number
is displayed

The specified setting memory number and the setting nameare displayed in highlight

Press the [Recall]soft key to open
the dialog box forchecking therecall operation

Select [OK] andthen press the
ENTER key toexecute recall

124

top menu window. In this window, select[Recall Memory] and then press the ENTER
ENTER key to display the Recall Memory
screen.

2. In the Recall Memory screen, select the[Memory No.] field in the top left part of thescreen and then press the ENTER ENTER
key to open the field for inputting thenumber of the setting memory to berecalled.

3. Increment/decrement the setting memory
number with theup/down arrow
keys or themodify knob.
The specified setting memory number andsetting name are displayed in highlight in
the left part of the screen. An outline of thesetting saved to the setting memory of thespecified number is displayed in the rightpart of the screen.

4. Select the number of the setting memory
to be recalled and then press the ENTER
ENTER key to close the setting memory
number input field.

5. Press the [Recall] soft key to open the
dialog box for checking the recall
operation.
To execute recall, select [OK] and thenpress the ENTER ENTER key. Recall is
executed and the current setting contents
are replaced with the recalled setting
contents.

MULTIFUNCTION GENERATOR

5.2 Recalling Settingsb) Changing the setting memory namePress the[Rename] soft
key to open thesetting memory
name input field

1. Similarly to the saving operation, after
setting the setting memory number, press
the [Rename] soft key to open the setting
memory name input field.

2. The name input method is the same as in
the case of the Store Memory screen.
) p. 123

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6.

LIST OF INITIAL SETTINGS

The following initial settings are restored by executing [Reset] (setting initialization) on the
Utility screen.
These items are also the targets to be saved in the setting memory (except for the output on/off
setting).
The arbitrary waveform memory, setting memory, sequence memory, user-defined unit
definition, output setting at power-on, panel operation setting, and remote setting are notinitialized. Although the user-defined unit definition is not initialized, it is the target to be
saved in the setting memory.

■ Output setting
Oscillation mode

Continuous oscillation

Waveform

Sine

Polarity and amplitude range

Normal, ±FS

Frequency

1 kHz

Amplitude

0.1 Vp-p

DC offset

0V

Range

Auto

Load impedance

Open

Phase

0°

OutputOff

Sync/sub-output

Reference phase synchronization■ Waveform
Square wave duty

Normal range, 50%

Pulse wave duty

50%

Pulse wave leading edge time, trailing edge time

1 μs

Ramp wave symmetry

50%

Parameter-variable waveform

Steady sine group, unbalanced sine

■ Modulation

126

Modulation typeFM

FM peak deviation

100 Hz

FSK hop frequency

1.1 kHzPM peak deviation

90°

PSK deviation

90°

AM modulation depth

50%

DC offset modulation peak deviation

0.1 V

PWM peak deviation

10%

Modulation source

Internal, sine, 100 Hz

FSK, PSK external modulation input polarity

Positive

Sync/sub-output

Internal modulation synchronization

MULTIFUNCTION GENERATOR

■ Sweep
Sweep type

Frequency

Frequency sweep range

1 kHz to 10 kHz

Phase sweep range−90° to 90°

Amplitude sweep range

0.1 Vp-p to 0.2 Vp-p

DC offset sweep range−0.1 V to 0.1 V

Duty sweep range

40% to 60%

Sweep time

0.1 s

Sweep mode

Continuous

Trigger source

Internal, 1 sExternal trigger input polarity

Negative

Sweep function

One-way, linear

Mark values

5 kHz, 0°, 0.15 Vp-p, 0 V, 50%

Stop level

Off, 0%External control input

Disabled

Oscillation stop unit during gated single-shot

1 cycleSync/sub-output

Sweep synchronization, marker on■ BurstBurst mode

Trigger burst

Mark wave number

1 cycleSpace wave number

1 cycleTrigger source

Internal, 10 ms

External trigger input polarity

Negative

Trigger delay

0s

Stop level

Off, 0%

Oscillation stop unit during gate

1 cycleSync/sub-output

Burst synchronization■ 2-channel operation (WF1974 only)
Channel mode

Independent

Frequency difference

0 Hz

Frequency ratio

1:1

Same-value setting

Off■ Other
Use of user-defined unit

Released

External 10 MHz frequency reference

Disabled

External addition

Off

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6. LIST OF INITIAL SETTINGS

The following settings are factory-default settings for items which do not return to their initialvalues even if initialization is executed once the settings are changed by the user.
■ User-defined unit definition
Unit nameusr1 to usr6

Calculation formula(h+n)*m

m

1

n

0

■ Output settings at power-on and power operation settings
Output at power-on

Off

Display

Backlight on, dark color

Modify direction

Downward through clockwise
rotation

Operation soundOn■ Remote settings
Interface

USB

GPIB address

2

The following settings are initialized every time the power is switched on.
■ Sequence

128

Start step

1

Trigger polarity

Off

External control input

Disabled

External control start/state branchStart

Sync/sub-output

Step synchronization

Step time

1s

Auto hold

Off

Jump destination

Off

Number of jumps

Infinite

Stop phase

OffState branch

Off

Event branch

Off

Control of step termination

Go to next step

Step code

LLLL

Internal step operation

Constant

Channel parameters

Equal to initial settings

MULTIFUNCTION GENERATOR

7.

SPECIFICATIONS

The values of items marked with *1 are guaranteed values. All other values are either nominal
values or typical (typ.) values, and are not guaranteed.
Conditions unless otherwise mentioned are as follows: Continuous oscillation, 50 Ω load, 10
Vp-p/50 Ω amplitude setting, 0 V DC offset setting, auto-range, ±FS waveform amplitude
range, external addition off, AC voltage = RMS value measurement.

7.1

Oscillation Modes
Continuous, modulated, sweep, burst, sequence

7.2

Waveforms

7.2.1 Standard waveforms
Types

Sine, square, pulse, ramp, parameter-variable
waveform, noise (Gaussian distribution), DC

Polarity

Normal, inverted (selectable) (excluding DC)

Amplitude range−FS/0, ±FS, 0/+FS (selectable)(excluding DC)

7.2.2 Arbitrary waveforms
Waveform length

4 K to 512 K words (2n, n = 12 to 19) or
2 to 10,000 control points (linear interpolation
between control points)

Total waveform saving capacity

Up to 128 waveforms or 4 M words (combined total
for channels 1 and 2)
Saved to non-volatile memory

Waveform data amplitude resolution

16 bits

Sampling rate

120 MS/sPolarity

Normal, inverted (selectable)

Amplitude range−FS/0, ±FS, 0/+FS (selectable)

Output bandwidth

25 MHz, −3 dB

WF1973/WF1974

129

7. SPECIFICATIONS

7.3

Frequency, Phase
Frequency setting range
Oscillation Mode
WaveformContinuous, Modulated,
Sweep (Continuous,
Single-Shot)

Sweep (Gated SingleShot), Burst

SequenceSine

0.01 μHz to 30 MHz

0.01 μHz to 10 MHz

0.01 μHz to 10 MHz

Square0.01 μHz to 15 MHz

0.01 μHz to 10 MHz

0.01 μHz to 10 MHz

Pulse

0.01 μHz to 15 MHz

0.01 μHz to 10 MHz

Not usable

Ramp

0.01 μHz to 5 MHz

0.01 μHz to 5 MHz*2

Parameter-variable
waveform

0.01 μHz to 5 MHz

0.01 μHz to 5 MHz*2

Noise

Fixed to 26 MHz equivalent bandwidthDC

Frequency setting invalid

Arbitrary0.01 μHz to 5 MHz*2: Used through conversion to arbitrary waveform

7.4

Frequency setting resolution

0.01 μHz

Frequency setting by period

Setting equivalent to inverse number of the set period

Frequency accuracy at shipping*1±(3 ppm of setting + 2 pHz)

Frequency aging rate*1±1 ppm/year

Phase setting range−1800.000° to +1800.000°(0.001° resolution)

Output Characteristics

7.4.1 Amplitude
Setting range

0 Vp-p to 20 Vp-p/open, 0 Vp-p to 10 Vp-p/50 ΩPeak value combining waveform amplitude and DC
offset is limited to ±10 V/open or lower.

Setting resolution

999.9 mVp-p or lower 4 digits or 0.1 mVp-p
1 Vp-p or higher
5 digits or 1 mVp-p

Accuracy*1±(1% of amplitude setting [Vp-p] + 2 mVp-p)/open
Condition: 1 kHz sine, amplitude setting of 20 mVp-p/
open or higher

Setting units

Vp-p, Vpk, Vrms, dBV, dBm

Range

Auto, hold (selectable)
Maximum output voltage range: 20 Vp-p, 4 Vp-p
Amplitude attenuator range: 0 dB, −10 dB, −20 dB,−30 dB

Waveform amplitude resolution

Approx. 14 bits
Condition: Amplitude setting of 36 mVp-p/open or
higher

7.4.2 DC offset

130

Setting range±10 V/open, ±5 V/50 Ω

Setting resolution±499.9 mV or lower 4 digits or 0.1 mV±0.5 V or higher
5 digits or 1 mV

MULTIFUNCTION GENERATOR

7.5 Signal Characteristics

Accuracy*1±( | 1% of DC offset setting [V] | +5mV
+ 0.5% of amplitude setting [Vp-p])/open
Condition: Sine wave output of 10 MHz or lower, 20°C
to 30°C
Outside 20°C to 30°C temperature range,
1 mV/°C typ. is added

7.4.3 Load impedance setting
Functions

Setting and display of the amplitude and DC offset forthe output termination voltage under the specified loadcondition.

Setting range

1 Ω to 10 kΩ (1 Ω resolution), 50 Ω, High-Z (load open)

7.4.4 Waveform output
Output on/off control

On, Off (selectable) (When Off, output pin open state)

Output impedance

50 Ω, unbalanced

Short-circuit protection

Protection against short circuit to signal GND

Output connector

Front panel, BNC receptacle

7.4.5 Sync/sub output

7.5

Output signal

Reference phase sync, internal modulation sync, burst
sync, sweep sync, sequence step sync, internal
modulation signal, sweep X drive (selectable)

Reference phase sync output
waveform

Square waveform with 50% duty that rises at zero
phase position of reference phase (DDS oscillation
phase) of waveform output

Output voltage

Sync signals: TTL level (low level 0.4 V/open or lower,
high level 2.7 V/open or higher)
Internal modulation signal: −3 V to +3 V/open
Sweep X drive: 0 V to +3 V/open

Output impedance

50 Ω, unbalanced

Load impedance

50 Ω or higher recommended

Output connector

Front panel, BNC receptacle

Signal Characteristics

7.5.1 Sine wave
Amplitude frequency characteristics*1
100 kHz or lower±0.1 dB

100 kHz to 5 MHz±0.15 dB

5 MHz to 20 MHz±0.3 dB

20 MHz to 30 MHz±0.5 dB (±0.8 dB at amplitude setting of 2.8 Vp-p/50 Ωor higher)
Condition: Amplitude setting 50 mVp-p to 10 Vp-p/50
Ω, reference frequency 1 kHz

Total harmonic distortion*1
10 Hz to 20 kHz

WF1973/WF1974

0.2% or less
Condition: Amplitude setting of 0.5 Vp-p to 10 Vp-p/50 Ω

131

7. SPECIFICATIONS

Harmonic spurious*1
0.5 Vp-p to 2 Vp-p/50 Ω

2 Vp-p to 10 Vp-p/50 Ω

1 MHz or lower−60 dBc or lower−60 dBc or lower

1 MHz to 10 MHz−50 dBc or lower−43 dBc or lower

10 MHz to 30 MHz−40 dBc or lower−30 dBc or lower

Condition: Amplitude setting

Non-harmonic spurious*1
1 MHz or lower−60 dBc or lower

1 MHz to 10 MHz−50 dBc or lower

10 MHz to 30 MHz−45 dBc or lower
Condition: Amplitude setting of 0.5 Vp-p to 10 Vp-p/50 Ω7.5.2 Square wave
Duty
Variable range selectable

Normal, extended (selectable)

Normal range

Duty can be changed in range with little jitter and no
pulse loss. The higher the frequency, the narrower the
duty setting range.

Extended range

With 2.5 ns rms or less typ. jitter, duty can be changed
always in maximum range. In the case of a pulse widthof 8.4 ns or less, loss may occur; on average, it is equal
to the set duty.

Setting range
Normal range

0.0100% to 99.9900% (0.0001% resolution)
Upper limit (%): 100 − frequency (Hz) / 300,000
Lower limit (%): frequency (Hz) / 300,000

Extended range

0.0000% to 100.0000% (0.0001% resolution)

Duty accuracy*1
100 kHz or lower±0.1% of period (duty setting 1% to 99%)

100 kHz to 1 MHz±1% of period (duty setting 5% to 95%)

1 MHz to 3 MHz±3% of period (duty setting 40% to 60%)

Rising/falling time*1

17 ns or lessHowever, approx. 20 ns in the case of burst oscillation
with stop level setting, gated single-shot sweep withstop level setting, and sequence oscillation

Overshoot

5% or less typ.

JitterNormal variable duty range: 300 ps rms or less typ.
(100 Hz or higher)
Extended variable duty range:2.5 ns rms or less typ.

7.5.3 Pulse wave
Pulse width132

Duty setting range

0.0170% to 99.9830% (0.0001% resolution)

Time setting range

25.50 ns to 99.9830 Ms (0.001% or less of period, or 0.01
ns resolution)

MULTIFUNCTION GENERATOR

7.5 Signal Characteristics

Leading edge time, trailing edge time
Setting range

15.0 ns to 58.8 Ms (3 digits or 0.1 ns resolution)
Leading edge time and trailing edge
independently settable

Minimum setting value

timeLargest of either 0.01% of period or 15 ns

Pulse width, leading edge time, trailing edge time limits
The pulse width time, leading edge time, trailing edge time, and period are mutuallyconstrained by the following equations.
The duty is converted from pulse width time / period.
(leading edge time + trailing edge time) × 0.85 ≤ pulse width time
pulse width time ≤ period − (leading edge time + trailing edge time) × 0.85
Overshoot

5% or less typ.

Jitter500 ps rms or less typ. (10 kHz or higher)
2.5 ns rms or less typ.
(under 10 kHz)7.5.4 Ramp wave
Symmetry setting range

0.00% to 100.00% (0.01% resolution)

7.5.5 Parameter-variable waveformsa) Steady sine group
Waveform
Name
Unbalanced
sine

Waveform
Example
1.5
1.0
0.5
0
0.5
1.0
1.5

Clipped
sine

1.5
1.0
0.5
0
0.5
1.0

Description and Variable Parameters
Waveform for which the amplitudes of the first half cycle and second halfcycle of a sine wave can be changed independently
First-half amplitude (−100.00% to 100.00%)
Second-half amplitude (−100.00% to 100.00%)
Waveform obtained by clipping the top and bottom of the amplitude of asine wave
Clip rate (0.00% to 99.99%)

1.5

CFcontrolled
sine

1.5
1.0
0.5
0
0.5
1.0

Waveform obtained by extracting only the 90° and 270° neighborhood of asine wave and expanding the amplitude
Crest factor (1.41 to 10.00)

1.5

Conduction
angle
controlled
sine
Staircase
sine

1.5
1.0
0.5
0
0.5
1.0
1.5

1.5
1.0
0.5
0

Waveform obtained by extracting only the front or back of each half cycleof a sine wave
Conduction angle (−180.00° to 180.00°)
Remark: In the case of a positive/negative conduction angle, back/front
conduction angle
Staircase shaped sine wave
Number of steps (2 to 100)

0.5
1.0
1.5

Multi-cycle
sine

1.5
1.0
0.5
0
0.5
1.0

Waveform obtained by continuing sine for several cycles
Number of cycles (0.01 to 50.00)
Start phase (−360.00° to 360.00°)

1.5

WF1973/WF1974

133

7. SPECIFICATIONSb) Transient sine group
Waveform
Name
On-phase
controlled
sine

Waveform
Example
1.5
1.0
0.5
0
0.5
1.0

Description and Variable Parameters
Sine wave with slope into on state
Complete-on phase (0.00° to 360.00°)
On-slope time (0.00% to 50.00% of basic period)

1.5

Off-phasecontrolled
sine

1.5
1.0
0.5
0
0.5
1.0

Sine wave with slope into off state
Off-phase (0.00° to 360.00°)
Off-slope time (0.00% to 50.00% of basic period)

1.5

Chatteringon sine

1.5
1.0
0.5
0
0.5
1.0
1.5

Chatteringoff sine

1.5
1.0
0.5
0
0.5
1.0
1.5

Sine wave with chattering into on stateOn-phase (0.00° to 360.00°)
Number of chatterings (0 to 3)
On-state time (0.00% to 20.00% of basic period)
Off-state time (0.00% to 20.00% of basic period)
Sine wave with chattering into off state
Off-phase (0.00° to 360.00°)
Number of chattering (0 to 3)
On-state time (0.00% to 20.00% of basic period)
Off-state time (0.00% to 20.00% of basic period)c) Pulse group
Waveform
Name
Gaussianpulse

Waveform
Example
1.5
1.0
0.5
0

Description and Variable Parameters
Gaussian distribution waveformStandard deviation (0.01% to 100.00% of basic period)

0.5
1.0
1.5

Lorentz
pulse

1.5
1.0
0.5
0

Lorentz waveform
Half value of width (0.01% to 100.00% of basic period)

0.5
1.0
1.5

Haversine

1.5
1.0
0.5
0

Sin2 pulse
Width (0.01% to 100.00% of basic period)

0.5
1.0
1.5

Half-sine
pulse

1.5
1.0
0.5
0

Half-sine cycle pulse
Width (0.01% to 100.00% of basic period)

0.5
1.0
1.5

Trapezoid
pulse

1.5
1.0
0.5
0
0.5
1.0

Trapezoid pulse
Slope width (0.00% to 50.00% of basic period)
Upper base width (0.00% to 100.00% of basic period)

1.5

Sin(x)/x

1.5
1.0
0.5
0

Sin(x)/x waveform
Number of zero crossings (1 to 50)

0.5
1.0
1.5

134

MULTIFUNCTION GENERATOR

7.5 Signal Characteristicsd) Transient response group
Waveform
Name
Exponential
rise

Waveform
Example
1.5
1.0
0.5
0

Description and Variable Parameters
First order LPF step response waveform
Time constant (0.01% to 100.00% of basic period)

0.5
1.0
1.5

Exponential
fall

1.5
1.0
0.5
0

First order HPF step response waveform
Time constant (0.01% to 100.00% of basic period)

0.5
1.0
1.5

Secondorder LPF
step
response
Dampedoscillation

1.5
1.0
0.5
0
0.5
1.0

Second order LPF step response waveform
LPF natural frequency (1.00 to 50.00 times basic frequency)
LPF Q (0.50 to 50.00)

1.5

1.5
1.0
0.5
0
0.5
1.0
1.5

Oscillation waveform with an amplitude that decreases exponentially
Oscillation frequency (0.01 to 50.00 times basic frequency)
Damping time constant (−100.00% to 100.00% of basic period)
Remark: In the case of a negative damping time constant, oscillation
waveform with an amplitude that increases exponentiallye) Surge group
Waveform
Name
Oscillation
surge

Waveform
Example
1.5
1.0
0.5
0
0.5
1.0
1.5

Pulse surge

1.5
1.0
0.5
0
0.5
1.0
1.5

Description and Variable Parameters
Surge waveform with damped oscillation
Oscillation frequency (0.01 to 50.00 times basic frequency)
Damping time constant (0.01% to 100.00% of basic period)
Trailing time constant (0.01% to 100.00% of basic period)
Pulsed surge waveform
Rising time (0.01% to 100.00% of basic period)
Duration time (0.01% to 100.00% of basic period)
Remark: The rising time represents the time from the 10% threshold tothe 90% threshold of the rising edge. The duration time
represents the time from the 10% threshold of the rising edge tothe 10% threshold of the next falling edge.

f) Other waveform group
Waveform
Name
Trapezoidwith offset

Waveform
Example
1.5
1.0
0.5
0
0.5
1.0
1.5

WF1973/WF1974

Description and Variable Parameters
Trapezoid waveform with offset in the amplitude direction
Leading delay (0.00% to 100.00% of basic period)
Rising-slope width (0.00% to 100.00% of basic period)
Upper base width (0.00% to 100.00% of basic period)
Falling-slope width (0.00% to 100.00% of basic period)
Offset (0.00% to 100.00%)

135

7. SPECIFICATIONS

Waveform
Name

Waveform
ExampleHalf-sineedge pulse

1.5
1.0
0.5
0
0.5
1.0
1.5

Bottomreferenced
ramp

1.5
1.0
0.5
0

Description and Variable Parameters
Pulse whose rise and fall are half-sine waveform
Leading edge time (0.00% to 100.00% of basic period)
Trailing edge time (0.00% to 100.00% of basic period)
Duty (0.00% to 100.00%）
Ramp waveform with bottom level as reference
Symmetry (0.00% to 100.00%)

0.5
1.0
1.5

7.6

Modulated Oscillation Mode

7.6.1 General
Modulation type

FM, FSK, PM, PSK, AM, DC offset modulation, PWM

Modulation source

Internal, external (selectable)

Internal modulation waveform
Other than FSK, PSK

Sine wave, square wave (50% duty), triangular wave
(50% symmetry), rising ramp wave, falling ramp wave,
noise, arbitrary wave

FSK, PSK

Square wave (50% duty)Internal modulation frequency
Other than FSK, PSK

0.1 mHz to 100 kHz (5 digits or 0.1 mHz resolution)

FSK. PSK

0.1 mHz to 1 MHz (5 digits or 0.1 mHz resolution)

Internal modulation sync output
Output waveform

Square wave with 50% duty that rises at zero phase
position of internal modulation waveform
Fixed to low level while internal modulation waveform
is noise

Output connector

Shared with sync/sub-output connector

Internal modulation signal output
Output voltage−3 V to +3 V/open

Output connector

Shared with sync/sub-output connector

External modulation input (other than FSK, PSK)
Input voltage range±1 V full scale

Maximum allowed input±2 V

Input impedance

10 kΩ, unbalanced

Input frequency

DC to 25 kHz

Input connector

Front panel (WF1973) / rear panel (WF1974)
BNC receptacle
Shared with external addition input, cannot be usedsimultaneously with adding operation

External modulation input (FSK, PSK)

136

Polarity

Positive, negative (selectable)

Input frequency

DC to 1 MHz

MULTIFUNCTION GENERATOR

7.6 Modulated Oscillation Mode

Input connector

Use of external trigger input.
Input voltage and input impedance follow the external
trigger input specifications.

7.6.2 Modulation conditions■ FM
Carrier waveformStandard waveform other than noise, pulse wave andDC, and arbitrary waveform

Peak deviation setting range

0.00 μHz to less than 15 MHz (8 digits or 0.01 μHz
resolution)■ FSK
Carrier waveformStandard waveform other than noise, pulse wave andDC, and arbitrary waveform

Hop frequency setting range

Within settable carrier waveform frequency range(8 digits or 0.01 μHz resolution)■ PM
Carrier waveformStandard waveform other than noise and DC, andarbitrary waveform

Peak deviation setting range

0.000° to 180.000° (0.001° resolution)■ PSK
Carrier waveformStandard waveform other than noise and DC, andarbitrary waveform

Deviation setting range−1800.00° to +1800.000° (0.001° resolution)

RemarkThe sine wave amplitude frequency characteristics
during PSK are limited to 25 MHz, −3 dB.

■ AM (non-DSB-SC)
Carrier waveformStandard waveform other than DC, and arbitrary
waveform

Modulation depth setting range

0.0% to 100.0% (0.1% resolution)

RemarkWhen the modulation depth is 0%, the amplitude is 1/2of the set value.

■ AM (DSB-SC) (Double Side Band - Suppressed Carrier)
Carrier waveformStandard waveform other than DC, and arbitrary
waveform

Modulation depth setting range

0.0% to 100.0% (0.1% resolution)

RemarkWhen the modulation depth is 100%, the maximum
amplitude is equal to the set value.
During DSB-SC, the carrier frequency component is
zero.

■ DC offset modulation
Carrier waveformStandard waveform and arbitrary waveform

Peak deviation setting range

0 V to 10 V/open■ PWM
Carrier waveform

Square wave, pulse wave

Peak deviation setting range
Square wave
Normal variable duty range

WF1973/WF1974

0.0000% to 49.9900% (0.0001% resolution)137

7. SPECIFICATIONSExtended variable duty range 0.0000% to 50.0000% (0.0001% resolution)
Pulse wave

7.7

0.0000% to 49.9000% (0.0001% resolution)

Sweep Oscillation Mode7.7.1 General
Sweep types

Frequency, phase, amplitude, DC offset, duty

Sweep functions

One-way (ramp waveform shape), shuttle (triangular
waveform shape) (selectable)
Linear, log (frequency sweep only) (selectable)

Sweep range setting

Start value and stop value specification
Center value and span value specification.

Sweep time setting range

0.1 ms to 10,000s (4 digits or 0.1 ms resolution)

Sweep mode

Continuous, single-shot, gated single-shot (selectable)
During gated single-shot, oscillation occurs only during
sweep execution.

Operation

Start, stop, hold/resume, start value output, stop value
outputTrigger source (used for single-shot sweep and gated single-shot sweep)
Internal, external (selectable)
Trigger delay setting is invalid. Manual trigger
possible.
Internal trigger oscillator for sweep(used for single-shot sweep and gated single-shot sweep)
Period setting range

100.0 μs to 10,000 s (5 digits or 0.1 μs resolution)

Stop level setting (used for gated single-shot sweep)
Function

Specification of signal level while oscillation is stopped
during gated single-shot sweep

Setting range−100.00% to +100.00% of amplitude full scale (0.01%
resolution) or off

Oscillation stop unit during gated single-shot
1 cycle, 0.5 cycles (selectable)
Sweep sync/marker output
Marker off, one-way sweep

Low level from sweep start value to half of sweep time.
High level at any other time.

Marker off, shuttle sweep

Low level from sweep start value to sweep stop value.
High level at any other time.

Marker on

Low level from sweep start value until marker value.
High level at any other time.

Output connector

Shared with sync/sub-output connector

Sweep X drive output
Output voltage

0 V to +3 V/open
0 V → +3 V during sweep value rise
+3 V → 0 V during sweep value fall

Output connector

Shared with sync/sub-output connector

Sweep external control input

138

Input connector

Use of 3 bits of multi-I/O connector

Control items

Start, stop, hold/resume

MULTIFUNCTION GENERATOR

7.8 Burst Oscillation Mode

Sweep external trigger input (used for single-shot sweep and gated single-shot sweep)
Polarity

Positive, negative, off (selectable)

Input connector

Use of external trigger input. Input voltage and input
impedance follow the external trigger input
specifications.

7.7.2 Sweep conditions■ Frequency sweep
Waveform

Standard waveform other than noise, pulse wave, andDC, and arbitrary waveform

Start, stop frequency setting range 0.01 μHz to 30 MHz (0.01 μHz resolution)■ Phase sweep
Waveform

Standard waveform other than noise and DC, andarbitrary waveform

Start, stop phase setting range−1800.000° to 1800.000° (0.001° resolution)■ Amplitude sweep
Waveform

Standard waveform other than DC, and arbitrary
waveform

Start, stop amplitude setting range 0 Vp-p to 20 Vp-p/open■ DC offset sweep
Waveform

Standard waveform and arbitrary waveform

Start, stop DC offset setting range −10 V to +10 V/open■ Duty sweep
Waveform

Square wave, pulse wave

Start, stop duty setting range
Square wave
Normal variable duty range

0.0100% to 99.9900% (0.0001% resolution)

Extended variable duty range 0.0000% to 100.0000% (0.0001% resolution)
Pulse wave

7.8

0.0170% to 99.9830% (0.0001% resolution)

Burst Oscillation Mode
Burst mode
Auto burst

Repeats oscillation of mark wave number andoscillation stop of space wave number. Trigger invalid.

Trigger burst

Performs oscillation of mark wave number in sync withtrigger.

Gate

Performs oscillations in cycles of integers or integer
multiples of half-cycles, in sync with the gate signal.
However, if the waveform is noise, oscillation on/off
operation is done through the gate signal.

Triggered gate

Gate oscillation switched on/off by gate upon trigger

Target waveforms
Auto, trigger burst

Standard waveform other than noise and DC, andarbitrary waveform

Gate, triggered gate

Standard waveform other than DC, and arbitrary
waveform

WF1973/WF1974

139

7. SPECIFICATIONS

Setting range of mark wave number 0.5 cycles to 999,999.5 cycles, in 0.5-cycle units
Setting range of space wave number 0.5 cycles to 999,999.5 cycles, in 0.5-cycle units
Oscillation stop unit during gate

1 cycle, 0.5 cycles (selectable)

Oscillation start/stop phase setting range−1800.000° to +1800.000° (0.001° resolution)
Remark: Same setting value as phase setting in section
7.3
Stop level setting range
Function

Specification of signal level when oscillation is stopped

Setting range−100.00% to +100.00% of amplitude full scale (0.01%
resolution) or off
When the stop level is set to off, stop occurs at the set
oscillation start/stop phase

Trigger source (used during other than auto burst)
Internal, external (selectable). Manual trigger possible.
Internal trigger oscillator for burst (used during other than auto burst)
Period setting range

1.0 μs to 1,000 s (5 digits or 0.1 μs resolution)

Trigger delay setting range

0.00 μs to 100.00 s (5 digits or 0.01 μs resolution)
Latent delay of 0.55 μs
Only valid for trigger burst (not valid for gate,
triggered gate)
Valid for both internal and external trigger sources.
Not valid for manual trigger.

Trigger jitter1 ns rms or less typ.

Burst sync output

7.9

Polarity

Low level during oscillation. High level at all othertimes.

Output connector

Shared with sync/sub-output connector

Triggers
External trigger input
Applications

Used for single-shot sweep, gated single-shot sweep,
trigger burst, gate, triggered gate, and sequence

Input voltage

TTL level (low level of 0.8 V or lower, high level of 2.6 V
or higher)

Maximum allowed input−0.5 V to +5.5 V

Polarity

Positive, negative, off (selectable)
FSK and PSK, sweep, sequence
settable)

Minimum pulse width

50 ns

Input impedance

10 kΩ (pulled up to +3.3 V), unbalanced

Input connector

Front panel (WF1973) / rear panel (WF1974)
BNC receptacle

Manual trigger
Applications
Internal trigger oscillator

140(independently

Panel key operation
Used for single-shot sweep, gated single-shot sweep,
trigger burst, gate, triggered gate
Independent for sweep and burst
Refer to internal trigger oscillator of each section.

MULTIFUNCTION GENERATOR

7.10 Sequence

7.10 Sequence
Number of saved sequences

10 sequences (saved to non-volatile memory)

Maximum number of steps

Maximum of 255 steps per sequence (not including stepof pre-start status)Inter-channel operation

In sequence mode, the mode of both channels is thesequence mode. Step control is done in common forboth channels.

Step control parameters

Step time, hold operation, jump destination, number ofjumps, step stop phase, branch operation, step
termination control, step sync code output

Intra-step channel parameters

Waveform, frequency, phase, amplitude, DC offset,
square wave duty

In-step operations

Constant, keep, linear interpolation (except waveform
switching)

Step time setting range

0.1 ms to 1,000 s (4 digits or 0.01 ms resolution)

Jump count setting range

1 to 999 or infinite

Step stop phase setting range

0.000° to 360.000° (CH1 reference phase. 0.001°
resolution) or invalid

Branch operation
State branch

Check of state branch input from multi-I/O connector
at step end. Upon branch input detection, branching to
specified destination step

Event branch

Immediate branching to specified destination step
through event branch manipulation or input

Control of step termination

Sequence end or transition to next step

Step sync code output

Output of 4-bit code specified for each step to multi-I/O
connector
LSB outputtable to sync/sub-output connector

Usable waveforms

Sine wave, square wave, noise, DC, and arbitrary wave
Ramp wave and parameter-variable waveform can beused through saving as arbitrary waveforms.

Maximum number ofusable waveforms

128

Step start phase

Oscillation start from reference phase 0° of eachchannel at next step after DC or noise (excluding DC
and noise)

Sequence manipulations

Start, stop, hold/resume, event branch

Sequence external control
Input connector

Use of 4 bits of multi-I/O connector

Control items

Start or state branch, stop, hold/resume, event branch

Sequence external trigger input (start trigger)
Polarity

Positive, negative, off (selectable)

Input connector

Use of external trigger input on CH1 side. Input
voltage and input impedance follow the external
trigger input specifications.

WF1973/WF1974

141

7. SPECIFICATIONS

7.11 Other I/Os
External 10 MHz frequency reference input
Frequency reference selection

External reference enable, disable (selectable)

Input voltage

0.5 Vp-p to 5 Vp-p

Maximum allowed input

10 Vp-pInput impedance

1 kΩ, unbalanced, AC coupled

Input frequency

10 MHz (±0.5% (±50 kHz))

Input waveform

Sine wave or square wave (50 ±5% duty)

Input connector

Rear panel, BNC receptacle

Frequency reference output (for synchronizing multiple WF1973, WF1974 units)
Output voltage

1 Vp-p/50 Ω square wave

Output impedance

50 Ω, AC coupled

Output frequency

10 MHzOutput connector

Real panel, BNC receptacle

External addition input
Addition gain

×2, ×10, off (selectable)
During ×2, the maximum output voltage range is fixed
to 4 Vp-p, and during ×10, 20 Vp-p.

Off during sequence oscillation
Input voltage−1 V to +1 V

Maximum allowed input±2 V

Input frequency

DC to 10 MHz (−3 dB)

Input impedance

10 kΩ, unbalanced

Input connector

Front panel (WF1973) / rear panel (WF1974)
BNC receptacle
Shared with external modulation input, cannot be usedduring external modulation

Multi-I/O

142

Applications

Sweep control, sequence control

Input voltage

TTL level (low level of 0.8 V or lower, high level of 2.6 V
or higher. Pulled up to +5 V through 10 kΩ)Maximum allowed input−0.5 V to +5.5 V

Output voltage

TTL level (low level of 0.4 V/open or lower, high level of
2.7 V/open or higher)

Connector

Rear panel, Mini-Dsub 15-pin multiconnector

MULTIFUNCTION GENERATOR

7.12 2-channel ganged operation (WF1974 only)

7.12 2-channel ganged operation (WF1974 only)
Channel modes
Channel Mode
Independent

Operation
Independent setting

2-phaseHolds same frequency. During frequency sweep, internal frequency
modulation, and internal FSK, the same frequency is controlled to be
held.
External frequency modulation and external FSK are not possible.
Phase independently set for each channel.

Constant frequency
difference

Holds the frequency difference as a constant value.
During frequency sweep, internal frequency modulation, and internal
FSK, the frequency difference is controlled to be held.
External frequency modulation and external FSK are not possible.

Constant frequency ratio Holds the frequency ratio as a constant value.
During frequency sweep, internal frequency modulation, and internal
FSK, the frequency ratio is controlled to be held.
External frequency modulation and external FSK are not possible.
Differential output

Same frequency, amplitude, and DC offset. Reverse phase waveform.
Differential output is controlled to be held during all types of sweep andinternal modulation.
External modulation and external addition are not possible.

Common limiting conditions during 2-phase, constant frequency difference, constantfrequency ratio, and differential output• Oscillation in same oscillation mode (also same modulation type during modulated
oscillation, and same sweep type during sweep oscillation)• Applicable to standard waveform other than noise and DC, and arbitrary waveform• Burst, gated single-shot sweep not possible
Same value setting, same manipulation
Yes
Frequency difference setting range 0.00 μHz to less than 30 MHz (0.01 μHz resolution)
CH2 frequency − CH1 frequency
Frequency ratio N:M setting range 1 to 9,999,999 (for each of N and M)
N:M = CH2 frequency:CH1 frequency
Phase synchronization
Time difference between
channels during 2-phase*1

WF1973/WF1974

Automatically executed during channel mode switching±20 ns or less (±10 ns or less typ.)
Condition: Same waveform (sine or square)143

7. SPECIFICATIONS

7.13 Synchronous Operation of Multiple Units
Connection
Connection method 1
Master unit

10MHz
REF INREF
OUTExternal reference
use possible

Slave unit

10MHz
REF INREF
OUT

T divider

Slave unit

10MHz
REF IN

Slave unit

REF
OUT

10MHz
REF IN50 Ω
termination
resistor

T divider

Connection method 2

Master unit

10MHz
REF INREF
OUT

Slave unit

10MHz
REF IN

REF
OUT

REF
OUT

Slave unit

10MHz
REF INREF
OUTExternal reference
use possible

Connection cable
Cable type

Coaxial cable with characteristic impedance of 50 Ωwith BNC connector (RG-58A/U, etc.)

Cable length limit

1 m or less between units, total length of 3 m or lessMaximum number ofconnectable units
Phase synchronization operation

Connection method 1: 6 units including master unit
Connection method 2: 4 units including master unit
Manual operation

Time difference between units
Delay of each channel of nth slave unit in relation to each channel of the master unit
(1 ≤ N)
Connection method 1:
31 ns + (N−1) × 6 ns
± 25 ns or less typ.
Connection method 2:± 25 ns or less typ.
31 ns + (N−1) × 31 ns
Condition: Same frequency, same phase, same waveform (sine or square), length of connection
cable between frequency reference output
and external frequency reference input = 1
m (RG-58A/U)

7.14 User-Defined Units

144

Function

Setting and display in arbitrary unit according to thespecified conversion expression

Setting target

Frequency (Hz), period (s), amplitude (Vp-p, Vpk), DC
offset (V), phase (deg), duty (%)

Conversion expression[(Setting target value) + n] × m, or[log10 (setting target value) + n] × m
Specification of conversion expression and values of nand mUnit character string

Up to 4 characters can be set

MULTIFUNCTION GENERATORWF1973/WF1974

Rear panel

Front panel

Surface treatment
Front panel: Plastic ultra-light gray (Munsell 6PB9.2/0.1)
Rear panel: Munsell 8.5PB2.6/0.2
Covers: Light gray leather tone (Munsell 6PB7.6/1.2 leather tone)

Side view

7.17 General Characteristics■ External dimensions (WF1973)

147

148

Rear panel

Front panel

Surface treatment
Front panel: Plastic ultra-light gray (Munsell 6PB9.2/0.1)
Rear panel: Munsell 8.5PB2.6/0.2
Covers: Light gray leather tone (Munsell 6PB7.6/1.2 leather tone)

Side view

7. SPECIFICATIONS■ External dimensions (WF1974)

MULTIFUNCTION GENERATORWF1973/WF1974

CautionTo mount the unit in the rack, do not hold it only with the rack mount adapters.
Be sure to use L-brackets or shelves in the rack to hold the main unit.

Surface treatment
Rack mount adapter: Painted in ultra-light gray (Munsell 6PB9.2/0.1)

RACK MOUNTING DIMENSIONSRACK MOUNTING DIMENSIONS■ Inch rack mounting dimensions (for 1 unit)

149

150

CautionTo mount the unit in the rack, do not hold it only with the rack mount adapters.
Be sure to use L-brackets or shelves in the rack to hold the main unit.
When mounting the unit with shelves, the thickness of the connecting brackets must
be taken into consideration.

Surface treatment
Rack mount adapter: Painted in ultra-light gray (Munsell 6PB9.2/0.1)

Connecting bracket dimensions(bottom side of housing)Connecting bracket
lengthConnecting bracket
length

RACK MOUNTING DIMENSIONS■ Inch rack mounting dimensions (for 2 units)

MULTIFUNCTION GENERATORWF1973/WF1974

CautionTo mount the unit in the rack, do not hold it only with the rack mount adapters.
Be sure to use L-brackets or shelves in the rack to hold the main unit.

Surface treatment
Rack mount adapter: Painted in ultra-light gray (Munsell 6PB9.2/0.1)

RACK MOUNTING DIMENSIONS■ Millimeter rack mounting dimensions (for 1 unit)

151

152

CautionTo mount the unit in the rack, do not hold it only with the rack mount adapters.
Be sure to use L-brackets or shelves in the rack to hold the main unit.
When mounting the unit with shelves, the thickness of the connecting brackets must
be taken into consideration.

Surface treatment
Rack mount adapter: Painted in ultra-light gray (Munsell 6PB9.2/0.1)

Connecting bracket dimensions(bottom side of housing)Connecting bracket
lengthConnecting bracket
length

RACK MOUNTING DIMENSIONS■ Millimeter rack mounting dimensions (for 2 units)

MULTIFUNCTION GENERATOR

Index10 MHz REF IN ...........................................15
42 Vpk ................................................... IV, 19

A

AC+DC limitation ..........................49, 50, 51
accessories check ...........................................4
active channel ..............................................38
adding external signal ................................57
amplitude range ................................... 52, 54
amplitude setting ........................................48
AMPTD key .................................................48
application ..................................................... I
arbitrary waveforms use .............................67
auto burst ...................................................106
mark wave number ..................... 106, 107
space wave number ..................... 106, 107
start auto burst ....................................108
start/stop phase ....................................107
stop auto burst .....................................108
stop level ...............................................108
sync output setting ..............................108
auto range/range hold .................................54

B
Basics ............................................................. I
block diagram (WF1973) ...............................2
block diagram (WF1974) ...............................3
Both ....................................................... 25, 40
burst ...........................................................105
auto burst .............................................106
burst mode .................. 106, 109, 113, 118
gate oscillation .....................................113
mode ........................... 106, 109, 113, 118
trigger burst .........................................109
triggered gate oscillation .....................118
types .....................................................105

C
calibration ......................................................7
CANCEL key ...............................................35
CH1/CH2 key ...............................................38
Conflict! .........................................73, 91, 108

D
dBm ..............................................................48

WF1973/WF1974

dBV .............................................................. 48
DC offset setting ......................................... 50
display format switching ............................ 28

E
ENTER key ................................................. 35
external dimensions (WF1973) ................ 147
external dimensions (WF1974) ................ 148
external frequency reference ................25, 39

F
FCTN key .................................................... 44
FCTN OUT .................................................. 12features ......................................................... 1
floating ground connection ......................... 19
FREQ key .................................................... 44
frequency setting ........................................ 44

Ggate oscillation .......................................... 113
manual trigger .................................... 115
noise gate oscillation ........................... 117
oscillation in half-cycle units .............. 116
start gate oscillation ........................... 115
start/stop phase ................................... 114
stop level .............................................. 116
sync signal ........................................... 115
trigger (gate) settings for gateoscillation .......................................... 115
grounding ...................................................... 6Hhigh level/low level setting of output
level ............................................................. 51

I
I/O terminals ............................................... 12
10 MHz frequency reference input ....... 15
external 10 MHz frequency reference
input .................................................... 15
external addition input ......................... 14
external modulation input .................... 14
external modulation/addition input ..... 14
external trigger input ........................... 14
frequency reference input ..................... 15
frequency reference output ................... 16

153

modulation/addition input .....................14
multi-I/O .................................................16
sync/sub-output ......................................13
trigger input ...........................................14
waveform output ....................................12
initial settings list .....................................126
installation .....................................................5
inverted (waveform polarity) ......................52

L
LINE ..............................................................6
load impedance setting ...............................55

M

MAN TRIG key .................. 90, 111, 115, 120
MENU key ...................................................29
MOD/ADD IN ..............................................14
modify knob .................................................30
modulation ...................................................69
AM (DSB-SC) setting .............................80
AM setting ..............................................79
carrier condition setting ........................72
common modulation settings andmanipulations .....................................72
DC offset modulation setting ................81
FM setting ..............................................75
FSK setting ............................................76
modulation sync signal, modulation
waveform signal ..................................74
modulation type selecting ......................72
modulation types ....................................69
modulation waveform signal .................74
modulation width setting ......................72
modulation with an external signal
source ...................................................73
modulation with arbitrary waveform ...73
modulation with the internal signal
source ...................................................72
PM setting ..............................................77
PSK setting ............................................78
PWM setting ..........................................82
screen for modulation setting andmanipulation .......................................70
start modulation ....................................73
stop modulation .....................................73
type .........................................................72
MULTI I/O ...................................................16

N
NEXT key ....................................................26
normal (waveform polarity) ........................52

154

numeric input ............................................. 31
numeric keypad .......................................... 31

O
OFFSET key ............................................... 50
operating principles ...................................... 2
options ........................................................... 5
oscillation mode setting .............................. 43
OUT key ...................................................... 41
output on/off ................................................ 41
overheating ................................................. 25P
panel
front panel of WF1973 ............................ 8
front panel of WF1974 .......................... 10
rear panel of WF1973 ............................. 9rear panel of WF1974 ........................... 11
panel and case cleaning ................................ 6
parameter-variable waveforms use ........... 65
period display .............................................. 45
period setting .............................................. 45
phase difference between channels ........... 47
phase difference setting ............................. 47
phase setting ............................................... 45
polarity ........................................................ 52
power on/off switching method .................. 21
power supply connection .............................. 7
pulse wave ................................................... 61
leading edge time .................................. 61
switching the pulse width time andpulse width duty ................................ 61
trailing edge time .................................. 61
width and leading/trailing edge time
setting ................................................. 61
width, leading edge time, and trailing edge
time definitions and limitations ........ 63

Rrack mounting dimensions ....................... 149
rack mounting method ................................. 6
ramp wave ................................................... 64
symmetry setting .................................. 64
recall procedure setting ............................ 124
Ref .........................................................25, 39
REF OUT .................................................... 16
reference phase ........................................... 46
remote control ................................................I
repacking ....................................................... 5
repair service ............................................ 157
restoration of settings ................................ 22

MULTIFUNCTION GENERATOR

restoring the initial settings .......................41
restoring the saved contents to theinitial settings ...........................................123

S
safety check ...................................................4
safety precautions ...................................... III
safety-related symbols ............................... IVsaving procedure setting ...........................122
screen configuration ....................................25
screen page swithching ...............................26
setting memory name changing ...... 123, 125
shortcut keys ...............................................34
soft key display ............................................26
specifications .............................................129
square wave .................................................59
difference between normal and extended
variable duty range .............................60
duty and frequency limitations forstandard variable duty range .............60
duty setting ............................................59
start/stop phase ...........................................46
status display area ......................................25
sweep ............................................................83
amplitude sweep setting ........................99
center and span ......................................86
common sweep settings andmanipulations .....................................86
continuously repeat ...............................87
DC offset sweep setting .......................101
duty sweep setting ...............................103
external logic control .............................94
frequency sweep setting ........................95
function ............................................ 86, 87
gated single-shot sweep .........................89
hold .........................................................91
item to be swept selecting .....................86
manual trigger .......................................90
mode ..........................................87, 88, 89
one-way sweep .......................................86
oscillation stop unit ...............................89
output the waveform only during sweep
execution .............................................89
pause sweep ...........................................91
phase sweep setting ...............................97
rising/falling direction ...........................87
sawtooth wave sweep .............................86
screen for sweep setting andmanipulation .......................................83
shuttle sweep .........................................87

WF1973/WF1974

single-shot sweep .................................. 88
start sweep ............................................ 91
start sweep in synchronization with atrigger ................................................. 88
start value output ................................. 91
start/stop phase ..................................... 89
stop level ................................................ 89
stop sweep .............................................. 91
stop value output ................................... 92
substitute center value to marker
value ................................................... 94
substitute marker value to center
value ................................................... 94
sweep function .................................86, 87
sweep marker signal ............................. 92
sweep mode ............................... 87, 88, 89
sweep range and time ........................... 86
sweep type ............................................. 86
sweep types ............................................ 83
sweep X drive signal ............................. 92
sync signal ............................................. 92
sync signal, marker signal, X drive
signal .................................................. 92
time ........................................................ 86
triangular wave sweep .......................... 87
trigger condition setting ....................... 90
type ........................................................ 86
SYNC/SUB OUT ......................................... 13Ttabs .............................................................. 27
Temp ............................................................ 25
top menu ..................................................... 29
TRIG IN ...................................................... 14
trigger burst .............................................. 109
manual trigger .................................... 111
mark wave number .....................109, 110
start trigger burst ............................... 111
start/stop phase ................................... 110
stop level .............................................. 112
sync signal ........................................... 111
trigger delay setting ............................ 111
trigger settings for trigger burst ........ 111
triggered gate oscillation .......................... 118
manual trigger .................................... 120
noise triggered gate oscillation ........... 121
oscillation in half-cycle units .............. 121
start triggered gate oscillation ........... 120
start/stop phase ................................... 119
stop level .............................................. 121

155

sync signal ............................................120
trigger settings .....................................120
TRIG’D lamp ...................... 90, 111, 115, 120

U
UCal .............................................................25
uncalibrated .................................................25
UNDO key ...................................................35
unit changing ...............................................36
unit of amplitude changing .........................48
user-defined unit .........................................37
Utility screen function ................................39

V

Vpk ........................................................ 48, 53
Vp-p ....................................................... 48, 53
Vrms .............................................................48

W
warranty ....................................................157
waste disposal ............................................. IV
waveform amplitude range .........................52
waveform polarity .......................................52
waveform polarity and amplitude range
setting ..........................................................52
waveform setting .........................................44156

MULTIFUNCTION GENERATORWARRANTYNF CORPORATION certifies that this instrument was thoroughly tested and inspected and foundto meet its published specifications when it was shipped from our factory.
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 of, NF will, at its option, either will
repair the defective product without any charge for the parts and labor, or either repair or replace
products which prove to be defective. For repair service under warranty, the product must be
returned to a service center designated by NF. Purchaser shall prepay all shipping cost, duties,
and taxes for the product to NF from another country, and NF shall pay shipping charge to return
the product to purchaser.
This warranty shall not apply to any defect, failure or damage caused by improper use, improperor inadequate maintenance and care or modified by purchaser or personnel other than NF
representatives.
NF CORPORATION

WF1973/WF1974

157http://www.nfcorp.co.jp/

NF Corporation

6-3-20, Tsunashima-higashi, Kohoku-ku, Yokohama 223-8508