SDM3055 Series
Digital Multimeter
User Manual
EN03B

SDM3055 Series Digital Multimeter User ManualContents
Copyright and Statement................................................................................................................... 1
General Safety Summary ................................................................................................................... 2
Safety Terms and Symbols ............................................................................................................... 6
Daily Maintenance and Cleaning ...................................................................................................... 7
Introduction of SDM3055 ................................................................................................................... 8
Abstract ............................................................................................................................................... 9
Chapter 1

Quick Start............................................................................................................ 10

General Inspection ...................................................................................................................... 11
To adjust the Handle ................................................................................................................... 12
Front Panel .................................................................................................................................. 13
Back Panel .................................................................................................................................. 14Power On .................................................................................................................................... 15
User Interface.............................................................................................................................. 16
Scan Card ................................................................................................................................... 17
Chapter 2

Function and Operation ...................................................................................... 20

To Select Measurement Range .................................................................................................. 21
To Select Measurement Speed .................................................................................................. 23
Basic Measurement Functions.................................................................................................... 24
To Measure DC Voltage ...................................................................................................... 25
To Measure DC Current ...................................................................................................... 27
To Measure AC Voltage ...................................................................................................... 29
To Measure AC Current....................................................................................................... 31
To Measure 2-Wire/4-Wire Resistance ............................................................................... 33
To Measure Capacitance..................................................................................................... 37
To Measure Frequency or Period ........................................................................................ 39
To Test Continuity ................................................................................................................ 43
To Test Diode ...................................................................................................................... 45
To Measure Temperature .................................................................................................... 47
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ISDM3055 Series Digital Multimeter User Manual

Measurement Parameters .......................................................................................................... 51
AC Filter ............................................................................................................................... 51
DC Input Impedance ............................................................................................................ 51
Short-circuit Resistance ....................................................................................................... 52
Dual-display Function.................................................................................................................. 53
Utility Function ............................................................................................................................. 56
Store and Recall................................................................................................................... 56
Manage File ......................................................................................................................... 58
I/O Configuration .................................................................................................................. 60
Board Test............................................................................................................................ 61
Firmware Update.................................................................................................................. 64
System Setup ....................................................................................................................... 64
Acquire ........................................................................................................................................ 67
Auto Trigger ......................................................................................................................... 67
Single Trigger....................................................................................................................... 68
External Trigger.................................................................................................................... 69
Help System ................................................................................................................................ 70
Math Function .............................................................................................................................. 72
Statistics ............................................................................................................................... 73
Limits .................................................................................................................................... 74
dBm ...................................................................................................................................... 76
dB ......................................................................................................................................... 77
Relative Value ...................................................................................................................... 78
Display Mode ............................................................................................................................... 79
Trigger ......................................................................................................................................... 83
Hold Measurement Function........................................................................................................ 84
Chapter 3

Application Examples ......................................................................................... 85

Example 1: Reading Statistic Functions ...................................................................................... 86
Example 2: To Eliminate Leads Impedance ................................................................................ 87II

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SDM3055 Series Digital Multimeter User Manual

Example 3: dBm Measurement ................................................................................................... 89
Example 4: dB Measurement ...................................................................................................... 90
Example 5: Limits Test ................................................................................................................ 92
Example 6: Thermocouple setting and measurement ................................................................ 94
Example 7: To Use Hold Measurement Function ........................................................................ 96
Example 8: To Use Application Software EasySDM ............................................................... 97
Chapter 4

Measurement Tutorial ......................................................................................... 98

True RMS AC Measurement....................................................................................................... 98
Crest Factor Errors (non-sinusoidal inputs) ................................................................................. 99
Loading Errors (AC Voltage) ..................................................................................................... 100
Application of the Analog Filter .................................................................................................. 101
Chapter 5General Troubleshooting .................................................................................. 103

Chapter 6

Appendix ............................................................................................................ 104

Appendix A: Accessories .......................................................................................................... 104
Appendix B: Warranty summary ............................................................................................... 105
Appendix C: Daily Maintenance and Cleaning .......................................................................... 106
Appendix D: Contact SIGLENT ................................................................................................. 107

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SDM3055 Series Digital Multimeter User Manual

Copyright and Statement
Copyright
SIGLENT TECHNOLOGIES CO., LTD. All rights reserved.
Trademark Information
SIGLENT is registered trademark of SIGLENT TECHNOLOGIES CO., LTD.
Statement⚫

SIGLENT products are protected by patent laws in and outside of the P.R.China.

⚫

SIGLENT reserves the rights to change the specification and price.

⚫

Information in this publication replaces all previous corresponding published material.

⚫

Contents in this manual are not allowed to be copied, extracted or translated in any form or by
any means without SIGLENT’s permission.

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SDM3055 Series Digital Multimeter User Manual

General Safety Summary
Read the following safety precautions carefully to avoid any personal injuries or damages to the
instrument and any products connected to it. To avoid potential hazards, please use the instrument
as specified.
Use proper power line.
It’s only allowed to use the special power line which is approved by local state.
Ground the instrument.
The instrument is grounded through the protective terra conductor of the power line. The ground
conductor must be connected to the earth to avoid electric shock. Make sure the instrument isgrounded correctly before connecting its input or output terminals.
Connect the signal wire correctly
The potential of the signal wire is equal to the earth, so do not connect the signal wire to a highvoltage.
Observe all terminal ratings
Please observe all ratings and sign instructions on the instrument to avoid fire or electric shock. Before
connecting the instrument, please read the manual carefully to gain more information about the ratings.
Do not operate with suspected failures
If you suspect that the product is damaged, please contact SIGLENT’s qualified service personnel toinspect it. Any repair and adjustment to the product or replacing a component should be done byqualified personnel only.
Avoid circuit or wire exposure
Don’t touch exposed contacts or components when the power is on.
Don’t operate without covers.
Don’t operate the instrument with covers or panels removed.
Use proper fuse.
It’s only allowed to use the specified fuse for the instrument.
Use proper over-voltage protection.
Make sure there is no over-voltage (like voltage caused by thunder and lightning) reaching to the
instrument, otherwise the operator may suffer an electric shock.

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SDM3055 Series Digital Multimeter User Manual

Antistatic protection.
Static electricity will cause damages to the instrument, so test in antistatic areas as far as possible.
Ground its inner and outer conductors to release the static electricity temporarily before connecting
the cable to the instrument.

Keep good ventilation.
Improper ventilation will cause the rise of the instrument’s temperature. Keep good ventilation andcheck the vent and fan regularly when using it.

Keep the surface of the instrument clean and dry.

Do not operate in wet or damp conditions.

Do not operate in flammable or explosive environment.

The disturbance test of all the models meets the limit values of A in the standard of EN
61326-1:2021.

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SDM3055 Series Digital Multimeter User Manual

Input terminal protection limitation
Protection limitation is defined for the input terminal:
1.

Main input (HI and LO) terminal
HI and LO terminals are used for Voltage, Resistance, Capacitance, Continuity, Frequency andDiode measurement. Two protection limitations are defined:⚫

HI-LO protection limitation: 1000VDC or 750AVC. It’s the maximum measurable voltage.
The limitation can be expressed as 1000Vpk.

⚫

LO-ground protection limitation: LO terminal can “float” 500Vpk relative to the groundsafely. The maximum protection limitation of HI terminal relative to the ground is 1000Vpk.
Therefore, the sum of the “float” voltage and the measured voltage can’t exceed 1000Vpk.

2.

Sampling (HI sense and LO sense) terminal
HI sense and LO sense are used for 4-wire Resistance measurement. Two protection limitations
are defined:3.

⚫

HI sense-LO sense protection limitation: 2000Vpk.

⚫

LO sense-LO sense protection limitation: 2Vpk.

Current input (I) terminal
I and LO terminals are used for current measurement. The maximum current which go throughthe I terminal is limited to 10A by the fuse on the back panel.

NOTE:
Voltage on the current input terminal corresponds to voltage on LO terminal. To keep good
protection, only use the fuse of specified type and level to replace this fuse.

IEC Measurement Category II Over-voltage Protection
SDM3055 Digital Multimeter provides over-voltage protection for line-voltage mains connections
meeting both of the following conditions toavoid the danger of electric shock:⚫

The HI and LO input terminals are connected to the mains under Measurement Category II
conditions as following.

⚫

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The maximum line voltage of the mains is 600VAC.

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SDM3055 Series Digital Multimeter User Manual

WARNING:IEC Measurement Category II includes electrical devices connected to mains at an outlet on a branch
circuit, such as most small appliances, test equipments, and other devices that plug into a branchoutlet or socket.
SDM3055 is capable of making measurements with the HI and LO inputs connected to mains insuch devices (up to 600VAC) or the branch outlet itself. However, the HI and LO terminals of
SDM3055 can’t be connected to mains in permanently installed electrical devices such as the main
circuit-breaker panels, sub-panel disconnected boxes and permanently wired motors. Such devices
and circuits are prone to exceed the protection limits of SDM3055.
NOTE:
Voltages above 600VAC only can be measured in circuits that are isolated from mains. However,there may be transient over-voltage in circuits that are isolated from mains. SDM3055 is able towithstand occasional transient over-voltage up to 2500Vpk. Please don’t use this instrument tomeasure circuits that transient over-voltage may exceed this level.

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SDM3055 Series Digital Multimeter User Manual

Safety Terms and Symbols
Terms in this manual. Terms may appear in this manual.
WARNING:
Warning statements indicate the conditions and behaviors that could result ininjury or loss of life.
CAUTION:
Caution statements indicate the conditions and behaviors that could result indamage to this product or other

CAT I (1000V):
IEC Measurement Category I. The highest measurable voltage is 1000Vpk in
the HI-LO terminal
CAT II (600V):
IEC Measurement Category II. Inputs may be connected to mains (up to
600VAC) under Category II overvoltage

Terms used on the instrument. Terms may appear on the instrument:
DANGER

Indicates an injury or hazard that may immediately happen.

WARNING

Indicates an injury or hazard that may not immediately happen.

CAUTION

Indicates that a potential damage to the instrument or other property mightoccur.

Symbols used on the instrument. Symbols may appear on the instrument.

6

Hazardous

Protective

Voltage

Earth Ground

Warning

Test

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SDM3055 Series Digital Multimeter User Manual

Daily Maintenance and Cleaning
Maintenance
When storing or placing the instrument, please avoid the liquid crystal display from direct
sunlight for a long time.
NOTE:
To avoid damages to the instrument or probe, please don’t place them in mist, liquid or solvent.

Cleaning
Please often clean the instrument or probe according to the use of them.
⚫

Wipe the external ash of the instrument and probe by a soft rag. Be careful not to scratch
the transparent plastic protective screen when cleaning the liquid crystal screen.

⚫

Use a soft rag that has been soaked by water to clean the instrument after cutting off thepower. Or use 75% isopropyl alcohol of water solvent to get a more thorough cleaning.

NOTE:
⚫

To prevent the surface of the instrument or probe from damages, please don’t use any
corrosive or chemical cleaning reagents.

⚫

Please make sure the instrument is already dry before restarting it to avoid short circuits or
personal injuries caused by water.

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SDM3055 Series Digital Multimeter User Manual

Introduction of SDM3055
SDM3055 is a 5½ dual-display instrument, especially fitting to the needs of high-precision,
multifunction, and automation measurements. It realized a combination of basic measurement
functions, multiple math functions, and display functions, etc.

SDM3055 holds a 4.3-inch color TFT-LCD display screen with 480*272 high resolutions. Its clear
keyboard layout and operation hints make it easier and agility to use. Besides, it supports multiinterface such as USB Device & Host, LAN and USB-GPIB (optional), which can meet users‟ demandfurthest.

Main Features:⚫

4.3-inch color TFT-LCD display screen with 480*272 high resolutions⚫

Real 5½ digits readings resolution⚫

Up to 150rdgs/S measurement speed⚫

True-RMS AC Voltage and AC Current measurements⚫

1 Gb Nand Flash size, mass storage configuration files and data files⚫

Built-in cold terminal compensation for thermocouple⚫

Support standard SCPI and control software on PC, compatible with commands of main stream
multimeters⚫

Supports dual-display function, Chinese and English menu⚫

Built-in help system, convenient to acquire information⚫

Support USB Device, USB Host, LAN, and USB-GPIB interfaces⚫

Configuration and measured data can be imported or exported via VXI 11, USBTMC and USB
flash drive, which is convenient for users to modify, view and backup

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SDM3055 Series Digital Multimeter User Manual

Abstract
The manual mainly introduces corresponding information of operating the SDM3055 Digital
Multimeter. It contains these chapters:

Chapter 1

Quick Start

Guide you to prepare the SDM3055 Digital Multimeter and know about the Front/Back panel anduser interface.

Chapter 2

Function and Operation

Introduce the functions and operations of SDM3055 in details.
Chapter 3

Application Examples

Introduce you how to use strong measurement functions of this instrument easily through someexamples.

Chapter 4

Measurement Tutorial

Guide you to eliminate the errors that may appear during your measurement and obtain accurate
result.

Chapter 5General Troubleshooting

Provide you some general troubleshooting.

Chapter 6

Appendix

Provide you information about accessories, warranties, troubleshooting, services and supports.

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SDM3055 Series Digital Multimeter User Manual

Chapter 1

Quick Start

This chapter guides users to quickly get familiar with the front and rear panels, user interface andmeasurement connections of the multimeter.

This chapter contains the following topics:⚫

General Inspection⚫

To adjust the Handle⚫

Front Panel⚫

Back Panel⚫

Power On⚫

User Interface⚫

Scan Card10

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SDM3055 Series Digital Multimeter User Manual

General Inspection
1.

Inspect the shipping container.
Please keep the damaged container or cushioning material until the contents of the shipment
have been checked for completeness and the instrument has passed both electrical andmechanical tests.
Damages of the instrument caused by the shipment will be compensated by the shipper or carrier.
SIGLENT will not be responsible for the free repair or replacement.

2.

Inspect the instrument.
If there exit any mechanical damages or lacking of components, or the instrument fails theelectrical and mechanical test, please contact your SIGLENT sales.

3.

Check the accessories.
Check the accessories according to the packing list carefully. If there exit any accessories
damaged or missing, please contact your SIGLENT sales.

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SDM3055 Series Digital Multimeter User Manual

To adjust the Handle
Adjust the handle position of SDM3055 properly to place the instrument stably so that users canmanipulate and observe the display better. Please grip the handle by the two sides and pull it outward.
Then rotate the handle to the appropriate position. Please operate as the following diagram.

Diagram 1-1 Handle adjustment

Diagram 1-2 Horizontal Position

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Diagram 1-3 Carrying Position

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SDM3055 Series Digital Multimeter User Manual

Front Panel
SDM3055 Digital Multimeter provides users with brief and clear front panel. These control buttons aregroup by logic and users only need choose corresponding buttons to carry out basic operations, as
shown in Diagram 1-4.

Diagram 1-4 Front Panel Overview

LCD Display

Auxiliary Measurement Function KeysUSB Host

Enable Trig Keys

Power Key

Direction Keys

Menu Keys

Signal Input Port

Basic Measurement Function Keys

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SDM3055 Series Digital Multimeter User Manual

Back Panel
SDM3055 Digital Multimeter’s Back Panel provides users with abundant interfaces, including USB
Device, USB Host, LAN and GPIB (Only for SDM3055A), as shown in the following diagram.

Diagram 1-5 Back Panel Overview

Power Socket

10/100 Ethernet

Power FuseVMC Output

AC Voltage Selector

Ext Trig

Inspection card interface

Current Input Fuse

USB Device (USBTMC)

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SDM3055 Series Digital Multimeter User Manual

Power On
Please power on the instrument as the following steps:
1.

Adjust AC Voltage Selector to 110 (100~120V, 45~440Hz, AC) or 220 (200~240V, 50/60Hz, AC)in accordance with power standards in your country;2.

Connect the instrument to AC supply via power cord supplied by SIGLENT;

3.

The power indicator light on the front panel will glitter slowly;

4.

Press the power key on the front panel, the instrument will be started a few seconds later.

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SDM3055 Series Digital Multimeter User Manual

User Interface

Trigger Mode

LAN Status Icon

Control Mode

Measurement
Function

Measurement
ResultOperation Menu

Measurement Range

Diagram 1-6 Single Display Interface

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SDM3055 Series Digital Multimeter User Manual

Scan Card
SDM3065x-sc in this multimeter supports 16 channel external patrol card and multi-point multi signal
test.
Table 1-1 Scan Card SC1016 measurement and test line connection.
Items

No. of wires

Number of channels

DCV, ACV [1]2 wires (H,L)

12 pairs (CH1~CH12) (125VAC,110VDC)

DCI, ACI [2]2 wires (H,L)

4 pairs (CH13~CH16) (2A range only)

2-Wire R,etc. [3]2 wires (H,L)

12 pairs (CH1~CH12)

4-Wire R

4 wires(Input H, L + Sense H,L)

6 pairs (CH1 [input] &CH9 [sense] , 2&8 , ….6&12)

Notes:[1] In 200V gear, the input signal is limited to 125VAC and 110VDC.
[2] Only the current below 2.2A is measured, and the error is: accuracy ± 3% (reading) + 0.02%(range)[3] There

are capacitance, diode, continuity, frequency/period, temperature (thermocouple),temperature 2-W RTD. The No. of wires and the Number of channels are the same with 2-W
resistance.

Operation Steps:
1.

Scanner Installtion① Turn off the power and pull out the power cord.
② Unscrew the two screws and take out the cover plate of the slot.

③ Press the connector button with your finger, and then insert the connecting line.

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SDM3055 Series Digital Multimeter User Manual④ Lead out the connecting line from the opening of the cover plate as shown in the figure, andthen fix the connecting line on the cable fixing base.

⑤ Insert the scan card SC1016 into the body along the guide rail, and lock the two screws again.
⑥ Plug in the power cord and turn it on.

2.

Measurement connection method
1)2-wire measurement mode [1] (voltage, current, 2-W resistance, capacitance, frequency/
period, continuity, diode, temperature)18

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SDM3055 Series Digital Multimeter User ManualNotes:[1] Each channel of CH1-CH12 can be used for switching measurement of voltage, 2-W resistance,

capacitance, frequency, continuity, diode, temperature, etc. CH13-CH16 channels are fixed for
current measurement below 2.2A.

2)4-wire measurement mode

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SDM3055 Series Digital Multimeter User Manual

Chapter 2

Function and Operation⚫

To Measure DC Voltage / Current⚫

To Measure AC Voltage / Current⚫

To Measure 2-Wire / 4-Wire Resistance⚫

To Measure Frequency / Capacitance⚫

To Test Continuity / Diode⚫

To Measure Temperature / Optional Multiple Scan Card⚫

To use Dual-display Function or Set Up the Utility⚫

Acquire Function or Help System⚫

Math Function or Display Function⚫

Run / Stop⚫

Single Trigger / Hold Measurement Function⚫

To Switch Functions or Return to Local Menu⚫

To Select Measurement Range

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SDM3055 Series Digital Multimeter User Manual

To Select Measurement Range
The Multimeter has two kinds of modes of selecting measurement range: “Auto” and “Manual”. It canselect appropriate range according to the signals input in Auto mode, which is very convenient forusers. While in Manual mode, you can obtain higher reading precision. Range selection keys are on
the right side of the front panel as the following diagram.

To increase range

To switch modes

To decrease range
Diagram 2-1 Range Selection Keys

Method 1: By Function keys on the Front Panel
Auto Range: Press
Manual Range: Press

to switch between Auto Range and Manual Range.
to increase range and press

to decrease range.

Method 2: By softkeys on the measurement main interface as Diagram 2-2.
Auto Range: Press [Auto] to choose Auto Range, meanwhile Manual Range is forbidden.
Manual Range: Press [200mV] , [2V] , [20V] , [200V] or [1000V] to choose required range manually.
Auto Range is forbidden at this moment.

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SDM3055 Series Digital Multimeter User Manual

Diagram 2-2 Range selection menus

Explanations:
1.

When the input signal is beyond the current scope of the measurement range, the Multimeter willshow “overload”.

2.

Range option will turn back to default setting “Auto” after restarting and remote reset.

3.

Users are suggested to select “Auto” range so as to protect the instrument against damage andget exact data as much as possible when it’s hard to predict the range of measurement.

4.

For Dual-display Function, the measurement ranges of Main display and vice display are similarand can’t be changed independently

5.

The range is fixed during testing the Continuity and Diode. The range of continuity is selected as
2kΩ, while the Diode is 2V.

6.

Auto Range is not suitable for measuring current up to 10A. If the signal is used to I Terminal,
users need to choose range manually.

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SDM3055 Series Digital Multimeter User Manual

To Select Measurement Speed
The instrument provides three types of measurement rate: 5 reading/s, 50 reading/s and 150 reading/s.
5 reading/s belongs to “Slow” rate; 50 reading/s belongs to “Middle” rate; 150 reading/s belongs to“Fast” rate.
Measurement speed can be controlled by softkey menu. Press [Speed] and then press [Slow], [Middle]
or [Fast] to choose measurement speed.

Diagram 2-3 Range selection menu

Explanations:1.

Three reading rates are available for DCV, ACV, DCI, ACI and 2-Wire/4-Wire Resistance: “Slow”,“Middle” and “Fast”.

2.

There is a linkage for both reading resolution and reading (measurement) rate.

3.

5 reading/s belongs to 5.5 digit resolution.

4.

Both 20 reading/s and 123 reading/s belong to 4.5 digit resolution.

5.

The reading resolution of Temperature is fixed at 5.5 digit and “Slow” respectively.

6.

The reading resolutions and measurement rates of both Diode and Continuity

are fixed at 4.5

digit and “Fast” respectively.
7.

The reading resolution and measurement rate of the Frequency function are fixed 5.5 digit and“Slow” respectively.

8.

The reading resolution and measurement rate of the Capacitance function are fixed at 5.5 digitand “Slow” respectively.

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SDM3055 Series Digital Multimeter User Manual

Basic Measurement Functions
SDM3055 Digital Multimeters have following basic functions:⚫

To Measure DC Voltage⚫

To Measure DC Current⚫

To Measure AC Voltage⚫

To Measure AC Current⚫

To Measure 2-Wire/4-Wire Resistance⚫

To Measure Capacitance⚫

To Measure Frequency or Period⚫

To Test Continuity⚫

To Test Diode⚫

To Measure Temperature24

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SDM3055 Series Digital Multimeter User Manual

To Measure DC Voltage
The Multimeter enables to measure DC Voltage up to 1000V. The method to connect and measure
DC Voltage will be introduced in details as the following steps.
(NOTE: DC Voltage is always the selected function when the Multimeter is turned on)

Operating Steps:
1.

Press

on the front panel to enter the DC Voltage measurement interface, as shown in

Diagram 2- 4.

Diagram 2-4 DC Voltage Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-5 Sketch Map for Measuring DC Voltage

3.

Choose a proper voltage range according to the measured circuit.

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SDM3055 Series Digital Multimeter User Manual

Table 2-1 Measurement Characteristics of DC Voltage
Ranges*200mV , 2V , 20V , 200V , 1000V

Input Protection

1000V on all ranges (HI terminal)

Configurable

Range, DC input impedance, Rel

NOTE*:⚫

All the ranges enable to obtain 20% value higher than original except 1000V. Besides, both
Manual and Auto are available for setting every range.

⚫

When inputting range is higher than 1000V at 1000V Level, “overload” will be shown on thescreen.

⚫

4.

1000V input protection exists in every range.

Set the DC input impedance (Only for Manual 200mV and 2V ranges).
Press [Input Z] to set the DC resistance as “10M” (default value) or “>10G”. Users can execute
DC voltage measurement directly without modifying this parameter which has been setup before
leaving factory.

5.

Set AC Filter function.
Press [Filter] to open or close the AC Filter.
(NOTE: Only DC Voltage and DC Current have this function.)6.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

7.

Read measurement result.
Select required measurement rate (reading rate) by pressing [Speed] and read the measurement
result.

8.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

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SDM3055 Series Digital Multimeter User Manual

To Measure DC Current
The Multimeter enables to measure DC Current up to 10A. The method to connect and measure DC
Current will be introduced in details as the following steps.
Operating Steps:
1.

Press

and

on the front panel to enter the DC Current measurement interface, as

shown in Diagram 2- 6.

Diagram 2-6 DC Current Measurement Interface

2.

Connect the red lead to terminal Input-I and black lead to terminal Input-LO as the following
diagram.

Diagram 2-7 Sketch Map for Measuring DC Current

3.

Choose a proper current range according to the measured circuit.

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SDM3055 Series Digital Multimeter User Manual

Table 2-2 Measurement Characteristics of DC Current
Ranges*200μA , 2mA , 20mA , 200mA , 2A , 10A

Input Protection

10A(back panel), 12A(inside the instrument)

Configurable

Range, Rel

NOTE*:All the ranges enable to obtain 20% value higher than original except 10A. Besides, both Manualand Auto are available for setting every range.

4.

Set AC Filter function.
Press [Filter] to open or close the AC Filter.

5.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

6.

Read measurement result.
Select required measurement rate (reading rate) by pressing [Speed] and read the measurement
result.

7.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

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SDM3055 Series Digital Multimeter User Manual

To Measure AC Voltage
The Multimeter enables to measure AC Voltage up to 750V. The method to connect and measure DC
Voltage will be introduced in details as the following steps.
Operating Steps:
1.

Press

on the front panel to enter the AC Voltage measurement interface, as shown in

Diagram 2- 8.

Diagram 2-8 AC Voltage Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-9 Sketch Map for Measuring AC Voltage

3.

Choose a proper voltage range according to the measured circuit.

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SDM3055 Series Digital Multimeter User Manual

Table 2-3 Measurement Characteristics of AC Voltage
Ranges*200mV , 2V , 20V , 200V ,750V

Input Protection

750Vrms on all ranges (HI terminal)

Configurable

Range, Rel

NOTE*:⚫

All the ranges enable to obtain 20% value higher than original except 750V. Besides, both
Manual and Auto are available for setting every range.

⚫

When inputting range is higher than 750V at 750V Level, “overload” will be shown on thescreen. 750V input protection exists in every range.

4.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Select required measurement rate (reading rate) by pressing [Speed] and read the measurement
result. If you press

and then pressandto get the frequency value measured

from input AC signal.

Diagram 2-10 Dual-display

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

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To Measure AC Current
The Multimeter enables to measure AC Current up to 10A. The method to connect and measure AC
Current will be introduced in details as the following steps.
Operating Steps:
1.

Press

and

on the front panel to enter the AC Current measurement interface, as

shown in Diagram 2-11.

Diagram 2-11 AC Voltage Measurement Interface

2.

Connect the red lead to terminal Input-I and black lead to terminal Input-LO as the following
diagram.

Diagram 2-12 Sketch Map for Measuring AC Current

3.

Choose a proper current range according to the measured circuit.

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SDM3055 Series Digital Multimeter User Manual

Table 2-4 Measurement Characteristics of AC Current
Ranges*200μA , 2mA , 20mA , 200mA , 2A , 10A

Input Protection

10A(back panel), 250V(fuse), 12A(inside the instrument)

Configurable

Range, Rel

NOTE*:All the ranges enable to obtain 20% value higher than original except 10A. Besides, both Manualand Auto are available for setting every range.

4.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Select required measurement rate (reading rate) by pressing [Speed] and read the measurement
result.

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

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To Measure 2-Wire/4-Wire Resistance
The Multimeter enables to measure 2-Wire Resistance and 4-Wire Resistance. The method toconnect and measure 2-Wire/4-Wire Resistance will be introduced in details separately.
2-Wire ResistanceOperating Steps:
1.

Press

on the front panel to enter the 2-Wire Resistance measurement interface, as shownin Diagram 2- 13.

Diagram 2-13 2-Wire Resistance Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-14 Sketch Map for Measuring 2-Wire Resistanceint.siglent.com

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SDM3055 Series Digital Multimeter User Manual3.

Choose a proper resistance range according to the scope.

Table 2-5 Measurement Characteristics of 2-Wire ResistanceRanges*200μA , 2mA , 20mA , 200mA , 2A , 10A

Open-circuit Voltage<8V

Input Protection

1000V on every range (HI terminal)

Configurable

Range, Rel

NOTE*:All the ranges enable to obtain 20% value higher than original. Besides, both Manual and Autoare available for setting every range.

4.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “ Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Select required measurement rate (reading rate) by pressing [Speed] and read the measurement
result.

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

NOTE:
You are suggested to make use of Relative function when measuring small resistance to reduce orescape impedance error from Test leads.

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4-Wire ResistanceOperating Steps:
1.

Press

and

on the front panel to enter the 4-Wire Resistance measurement interface,

as shown in Diagram 2- 14.

Diagram 2-15 4-Wire Resistance Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-16 Sketch Map for Measuring 4-Wire Resistance3.

Choose a proper resistance range according to the scope.

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SDM3055 Series Digital Multimeter User Manual

Table 2-6 Measurement Characteristics of 4-Wire ResistanceRanges*200Ω , 2kΩ , 20kΩ , 200kΩ , 2MΩ , 10MΩ , 100MΩ

Open-circuit Voltage<8V

Input Protection
Configurable Parameters(1) 1000V on each range (HI terminal)(2) 200V on each range (HI Sense, LO Sense)
Range, Rel

NOTE*:All the ranges enable to obtain 20% value higher than original. Besides, both Manual and Autoare available for setting every range.
4.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is open, the reading displayed is arelative value which comes from the result of actual measurement value subtracts the value thathas been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Select required measurement rate (reading rate) by pressing [Speed] and read the measurement
result.

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

NOTE:
Please do not put the terminals of the resistance on the conductive plane or in your hand to avoid
error. The bigger of the resistance, the more affection it will be brought.

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To Measure Capacitance
The Multimeter enables to measure Capacitance up to 1000μF. The method to connect and measure
Capacitance will be introduced in details as the following steps.

Operating Steps:
1.

Press

on the front panel to enter the Capacitance measurement interface, as shown in

Diagram 2- 17.

Diagram 2-17 Capacitance Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-18 Sketch Map for Measuring Capacitance3.

Choose a proper capacitance range according to the measured circuit.

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SDM3055 Series Digital Multimeter User Manual

Table 2-7 Measurement Characteristics of CapacitanceRanges*2nF , 20nF , 200nF , 2μF , 200μF , 200μF , 10000μF

Input Protection

1000V on all ranges (HI terminal)

Configurable Parameters

Range, Rel

NOTE*:All the ranges enable to obtain 20% value higher than original. Besides, both Manual and Autoare available for setting every range.

4.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Capacitance measurement is fixed at “Slow” rate. Therefore, you can’t adjust the reading rate
when reading the result.

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

NOTE:
Before measuring the electrolytic capacitance, you should make the two legs of the electrolytic
capacitance short circuit and let it be discharged.

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To Measure Frequency or Period
The Frequency or Period of a signal could be obtained by Dual-display Function during measuring its
voltage or current or by the function button on the front panel. The method to connect and measure
Frequency or Period will be introduced in details as the following steps.

To Measure Frequency
Operating Steps:
1.

Press

and

on the front panel to enter the Frequency measurement interface. The

lower right corner of the screen shows the unit of Frequency, as shown in Diagram 2- 19.

Diagram 2-19 Frequency Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-20 Sketch Map for Measuring Frequency

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SDM3055 Series Digital Multimeter User Manual3.

Choose a proper voltage range according to the measured circuit.

Table 2-8 Measurement Characteristics of Frequency
Ranges200mV, 2V, 20V, 200V, 750V

Measurement Range

20Hz ~ 1MHz

Input Protection

750Vrms on all ranges (HI terminal)

Configurable

Rel

4.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Frequency measurement is fixed at “Slow” rate. Therefore, you can’t adjust the reading rate while
reading the result.

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

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To Measure Period
Operating Steps:
1.

Press

and

on the front panel and select [Period] to enter the Period measurement

interface. The lower right corner of the screen shows the unit of Period, as shown in Diagram 221.

Diagram 2-21 Period Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-22 Sketch Map for Measuring Period

3.

Choose a proper voltage range according to the measured circuit.

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SDM3055 Series Digital Multimeter User Manual

Table 2-9 Measurement Characteristics of Period

4.

Ranges200mV, 2V, 20V, 200V, 750V

Measurement Range

20Hz ~ 1MHz

Input Protection

750Vrms on all ranges (HI terminal)

Configurable

Rel

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is open, the reading displayed is arelative value which comes from the result of actual measurement value subtracts the value thathas been set. (Please refer to “Math Functions” in Chapter 2 to know about the details.)

5.

Read measurement result.
Period measurement is fixed at “Slow” rate. Therefore, you can’t adjust the reading rate while
reading the result.

6.

View history data.
There are four types of way to view historical data: “Number”, “Bar Meter” “Trend Chart” and“Histogram”.

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To Test Continuity
Continuity test uses double leads method to measure the resistance of the measured circuit via about
0.5mA current. When the measured resistance in circuit is lower than the selected one, it is consideredbeing connected with instrument. The method to test Continuity will be introduced in details as thefollowing steps.

Operating Steps:
1.

Press

on the front panel to enter the Continuity test interface, as shown in Diagram 2- 23.

Diagram 2-23 Continuity Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-24 Sketch Map for Testing Continuity

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SDM3055 Series Digital Multimeter User Manual3.

Set the Short-circuit resistance.
The default value is set as 50Ω before leaving factory. The value can be changed by using
direction keys. You also can execute the Continuity measurement directly without modification.

Table 2-10 Measurement Characteristics of Continuity
Test Current

1mA

Ranges*Fixed at 2kΩ

Open-circuit Voltage<8V

Input Protection

1000V on all ranges (HI terminal)

Beep Condition

4.

0 ≤ Rtesting ≤ Short-circuit impedance1Ω ≤ Short-circuit impedance ≤ 2kΩ

Set the Beeper function.
Press [Beeper] to turn on or off the Beeper. If the circuit is continuous, the instrument will beep
once when the Beeper is turned on.

5.

Search for the test point and read measurement result.

NOTE:
Before testing continuity, please cut off the power and discharge all the high-voltage containers to
avoid damages to the Multimeter.

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To Test DiodeIf input voltage is under +0.7V (about 1.4kΩ), the Beeper will beep one time. If input voltage is under
50mV (about 100Ω) the Beeper will beep persistently. The method to test Diode will be introduced indetails as the following steps.

Operating Steps:
1.

Press

and

on the front panel to enter the Diode test interface, as shown in Diagram

2- 25.

Diagram 2-25 Diode Test Interface

2.

Connect red lead to both terminal Input-HI and anode of the Diode and black lead to both terminal
Input-LO and cathode of the Diode as the following diagram.

Diagram 2-26 Sketch Map for testing Diode3.

Set the Beeper function.
Press [Beeper] to turn on or off the Beeper. If the circuit is continuous, the instrument will beep
once when the Beeper is turned on.

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Table 2-11 Characteristics of Checking Diodes
Test Current

1mA

Ranges*Fixed at 2V

Open-circuit Voltage<8V

Input Protection

1000V (HI terminal)

Beep Condition

0.1V≤V measured≤2.0V

4.

Read measurement result.

5.

Reverse the probes and measure the voltage in the diode once more. Evaluate the diodeaccording to the following rules:⚫

If the Multimeter shows “overload” when in reverse bias model, it indicates that the diode isnormal.

⚫

If the Multimeter shows voltage about 0V and the instrument beeps persistently when inforward and reverse bias model, it indicates that the diode is short.

⚫

If the Multimeter shows “overload” when in forward and reverse model, it indicates that thediode is open.

NOTE:
Before testing diode, please cut off the power and discharge all the high-voltage containers to avoid
damages to the Multimeter.

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To Measure Temperature
The Multimeter supports for two types of temperature sensor: TC and RTD. The method to connect
and measure Temperature will be introduced in details as the following steps.
Operating Steps:
1.

Press

on the front panel to enter the Temperature measurement interface, as shown in

Diagram 2- 27.

Diagram 2-27 Temperature Measurement Interface

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as the following
diagram.

Diagram 2-28 Sketch Map for Measuring Temperature3.

Press [Load] and use direction keys to select the required file. Then press [Read] to recall an
existing configuration file.

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SDM3055 Series Digital Multimeter User Manual

Diagram 2-29 Load a Configuration File

4.

Press [Browse] to view the configuration, as shown in the following diagram:

Diagram 2-30 Configuration of the Sensor

5.

Press [Display] to choose a display mode. The Multimeter supports three display modes:
Temperature Value, Measured Value and All.

Diagram 2-31 Choose Display Mode of Temperature Measurement48

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SDM3055 Series Digital Multimeter User Manual

Press [All], the measured value will be shown on the Vice display and the corresponding value
will be shown on the Main display at the same time, which is convenient for users to observe
temperature and voltage values.

Diagram 2-32 Show Temperature And Voltage Values

6.

Press [Units] to choose the unit of temperature. The Multimeter supports three units: °C, °F, K.

Diagram 2-33 Unit Selection Interface

7.

Choose Cold Junction Compensation program (Optional operation).
Press [Ref Temp] to select inter Cold Junction Compensation or external Cold Junction
Compensation. Inter Cold Junction Compensation is default configuration, external Cold Junction
Compensation need user set calibration equipment temperature during calibration.

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Diagram 2-34 Set external Cold Junction Compensation

8.

Set relative value (Optional operation).
Press [Rel] to open or close Relative math function. When it is opened, the reading displayed isa relative value which comes from the result of actual measurement value subtracts the valuethat has been set.
(Please refer to “Math Functions” in Chapter 2 to know about the details.)

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Measurement Parameters
The parameters have been configured before the Multimeter leaving factory. Users can either
measure directly or modify them to meet your own requirements.
AC Filter
AC Filter is applicable for DC Voltage and DC Current measurement. When DC Voltage or DC Current
function is selected, press [Filter] to open the filter, as shown in the following diagram. If AC
component existing in inputted DC signal, it can be filtered by AC Filter so as to make the data moreexactly.

Diagram 2-35 Turn on or off AC Filter

DC Input Impedance
DC input impedance is only applicable for DC voltage measurement. When DC Voltage function is
selected, press [Range] and select [200mV] or [2V] to show the menu [Input Z], as the following
diagram shows.

Diagram 2-36 Choose DC Input Impedance
The options of input impedance for DC voltage measurements are 10MΩ and 10GΩ. 10MΩ
impedance is general for the Multimeter, but for 200mV and 2V manual ranges, 10GΩ should be
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SDM3055 Series Digital Multimeter User Manual

chosen for better result. The current selection will be saved in nonvolatile memory.

DC input impedance selection:⚫

While the DC input impedance is selected as 10MΩ, the input impedance of all measurement
range is 10MΩ;⚫

While the DC input impedance is selected to 10GΩ, the input impedance for 200mV and 2V
measurement range is 10GΩ; for 20V, 200V and 1000V measurement range is kept at 10MΩ.

⚫

The default value of DC input impedance is 10MΩ; settings of DC input impedance are stored in
the nonvolatile memory.

Short-circuit ResistanceSet up the short-circuit resistance value in the short-circuit test menu. When the measured resistanceis lower than the short-circuit resistance, the circuit is considered as connected, and the beeper
sounds (if sound is turned on). The short-circuit resistance is only applicable to the continuity test.
Operating Steps:
1.

When Continuity function is selected, press [Threshold] to enter interface as the following diagram.

Diagram 2-37 Set Up the Short-circuit Resistance2.

Use direction keys to change the parameter values.
Press left and right directional keys to choose different digits. Each press for the Left key, former
number will be selected, vice versa. Press up and down keys to change the current digit value.
Each press for the up key, value will be increased 1, vice versa.

Short-circuit Resistance:⚫

The range of short-circuit resistance is 0Ω~2000Ω. The default value is 50Ω.

⚫

The value of short-circuit resistance is stored in the nonvolatile memory and the resistanceremains unchanged after the power is off.

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SDM3055 Series Digital Multimeter User ManualDual-display Function
The Dual-display function is used to turn on two basic measurement functions, and observe the two
measurement results at the same time, thus improve the test and measurement functions. For
available combinations of Dual-display, refer to the following table.

Table 2-12 Available combination of Dual-display (letters in brackets correspond to Diagram 2-25
wiring example)
Correspond to
Diagram 2-25 wiring
exampleVice
Display
Function

Main Display Function
DCV

DCI

ACV

ACI

FREQ

PERIODDCV(b)(a)(1)

(b)

(a)

DCI

(a)(1)(c)(a)(1)

(c)

ACV

(b)

(a)(1)

(b)

(a)

(b)

(b)

ACI

(a)

(c)

(a)

(c)

(a)

(a)

FREQ

(b)

(a)

(b)

PERIOD(b)(a)

2-Wire R

2-WireR

4-WireRCap(b)(b)(2)

4-Wire RCap(d)(b)(3)

Remarks:(1) Because connection (a) reverses the polarity of current line, DCI measurement shows its negativevalue.
(2) At this time, connection (b) is not connected to power source, and "load" is the measured resistance.
(3) Inthis case, connection (b) is not connected to power source, and "load" is the measured

capacitance.

Operating Steps:
1.

Enable the Dual-display function
First press a function key on the front panel to open the main display function, and then press,the upper right corner will show “Dual”. By this time, press another function key to open
the vice display function to complete the activation. When enabled, press

to switch theMain / Vice Display Function. If you need to exit dual function, just press the front panel to enter
any function.
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Take the Main Display DCV and the Vice Display DCI as an example, press
, and

,

,

.

Diagram 2-38 Dual-display function Interface (Main DCV, Vice DCI)

2.

Make connection
Connect the test leads with the measured signal by referring to “Measurement Connections”. As
shown in the Diagram below, power source refers to connecting DC / AC power or not.

Diagram 2-39 Dual-display wiring example

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Instruction:
1)

If the same measurement function is used in both Main and Vice Display.
⚫

The readings in both of the display will update at the same time.

⚫

If math function (dBm, dB) is used in Main Display, when opening Vice Display, mathoperation will be closed automatically and Vice Display will show the same measurement
result as Main Display.

⚫

If math function (Statistics, Limits, Relative) is used in Main Display, when opening Vice
Display, the result will still be shown in Main Display and Vice Display will show the samemeasurement result as Main Display.

2)

If different measurement functions are used in both Main and Vice Display.
⚫

The readings in both of the display will update alternately.

⚫

If math function (dBm, dB) is used in Main Display, when opening Vice Display, mathoperation will be closed automatically and Vice Display will show the second selectedfunction normally.

⚫

If math function (Statistics, Limits, Relative) is used in Main Display, when opening Vice
Display, the result will still be shown in Main Display and Vice Display will show the second
selected function normally.

3)

If Temperature function is used in Main Display, set the display mode (→ [Display] →[All]). Then the result will be shown in Main Display and the current measurement value is shownin Vice Display.
4)

Auto Range is adopted by Vice Display. If the same measurement function is used in both thedisplay, so does the range.

5)

Measured data in Vice Display cannot be saved into “History”.

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Utility Function
The Utility function enables users to set up system parameters, interface parameters of themultimeters.
Press

and

to enter the operating menu of Utility function, as the following diagramshows.

Diagram 2-40 Utility Function Configuration Interface

Table 2-13 Utility Function Menu Description
Function Menu

Description

Store/Recall

Store or recall state files.

Manage File

Create a new file, copy, rename or delete a file.

I/O Config

Configure LAN and GPIB interface.

Test/Admin

Provide board test function.

System Setup

Configure instrument’s user settings.

Store and Recall
The Store/Recall function enables users to store and recall the instrument parameters and data
files in the local storage as well as in USB storage.

Operating Steps:
1.

After entering into the function menu of Utility, press [Store/Recall] to enter the interface as shownin diagram 2-40.

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Diagram 2-40 Store and Recall Interface

2.

Press [Store Settings] to enter the following interface.

Diagram 2-41 Store Settings Interface

Table 2-14 Storage Function Menu Description
Function Menu

Settings

BrowseDescription
Choose the location that file will be saved.

File
Name
Type
Store
MS DataDone

3.

Input a file name.
.xml / .csv

Choose the type that the file is saved.
Save the file as input file name to the current selected
location.
Save all changes and return to the higher-level
menu.

Press [Recall Settings] to enter the following interface. Use direction keys to choose storage pathand location, and press [Select] to recall the corresponding file.

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Diagram 2-42 Recall Function Interface

4.

Press [Power on] to set the Power On state of the instrument.
⚫

You can choose [Last] or [Factory Default] as the initial state when the instrument is turnedon.

⚫

The configuration is effective when you restart the Multimeter.

⚫

DC Voltage is always the selected function when the instrument is turned on even if you
have selected [Last] or [Factory Default] as the Power On state.

5.

Press [Set to Defaults] to select “Factory Default” as the Power On state.

6.

Press [Security Erase] to erase all stored files and return the instrument to its factory default state.

Manage File
The Manage File function enables users to create a new folder and save, copy, rename or delete files
in the local storage as well as in USB storage.
Operating Steps:
1.

After entering into the function menu of Utility, press [Manage File] to enter the interface as shownin diagram 2-43.

Diagram 2-43 Manage File Interface

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SDM3055 Series Digital Multimeter User Manual2.

Choose the file location.
Press [Browse] and use direction keys to select the corresponding file.

3.

Press [File Name] to enter the following interface.

Diagram 2-44 Input File Name
The method of inputting file name:4.

⚫

Press direction keys to select a desired char in the input area.

⚫

Press “OK” key on the front panel to input selected char in the input area.

⚫

Press [Clear All] to clear all input chars.

⚫

Press [Delete Char] to delete the letter on which the cursor taking place.

⚫

Press [Previous Char] to move the cursor in the file name area to the previous char.

⚫

Press [Next Char] to move the cursor in the file name area to the next char.

⚫

Press [Done] to save the current file and return to the higher-level menu.

⚫

Press [Cancel] to cancel the current operation and return to the higher-level menu.

Press [Action] and select [Folder], [Capture Display], [Copy], [Rename] or [Delete] to do thecorresponding operation.

Table 2-15 Action Settings
Function Menu

Description

FolderPress [Create Folder] to create a new folder.

CaptureDisplay

Press [Save Screen] to save current captured screen picture as
standard BMP format.

Copy

Press [Perform Copy] to copy the selected file.

RenamePress [Perform Rename] to rename the selected file.

DeletePress [Perform Delete] to delete the selected file.

Done

Save all changes and return to the higher-level menu.

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I/O Configuration
Press [I/O Config] to enter the following interface and set up the parameters.

Diagram 2-45 I/O Configuration Interface
LAN Settings
The Multimeter enables users to operate instrument remotely by LAN interface and store or recall
internet settings. You can look over current LAN settings and set up IP address and subnet mask.
After entering into the function menu of Utility, press [I/O Config] , Select [on] → [LAN Settings] →[Modify Settings] to enter the following interface.

Diagram 2-46 LAN Settings Interface
Table 2-16 LAN Settings
Function Menu

Description

IP Address

Set up IP address and the default setting is 10.11.11.104.

SubnetMask

Set up subnet mask and the default setting is 255.0.0.0.

CancelCancel current operation and return to the higher-level menu.

Done

Save all changes and return to the higher-level menu.

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Operating Steps:
1.

After entering into the function menu of I/O configuration, press [GPIB Settings] to enter theinterface shown in diagram 2-45.

Diagram 2-47 GPIB Settings
2.

Users can change the value of GPIB address by direction keys.

3.

Press [Select] to set the input value as GPIB address and return to the higher-level menu.

Board Test
SDM3055 provides self-test functions, including Key Test, LCD Test, Beeper Test and Chip Test.
Operating Steps:
1.

Press

and

, then choose [Test/Admin] → [Board Test] to enter the followinginterface.

Diagram 2-48 Board Test Interface

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Table 2-17 Board Test Function Description
Function Menu

Description

Key

Test the instrument’s keys.

LCD

Test the instrument’s LCD screen.

BeeperTest the instrument’s beeper.

Chip

Test the instrument’s chips.

Done

Return the higher-level menu.

2.

Test the keys.
Select [Key] to enter the key test interface, as the Diagram 2-47 shows. The on-screen lathy
rectangle shapes represent the keys on the front panel. Test all keys and knobs and you should
also verify that all the backlit buttons illuminate correctly.

Diagram 2-50 Key Test Interface

NOTE:

3.

⚫

Before you operate, the shapes on the screen display blue color.

⚫

The corresponding area of tested buttons or knobs would display green color.

⚫

Press [Done] to exit the test.

Test the LCD screen.
Select [LCD] to enter the screen test interface, the screen shows the message: “Press ‘Change’
to change

Press ‘Done’ to exit”. Press [Change] to start the test and observe if the screen

has severe color or other display error. As the Diagram 2-50 shows.

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Diagram 2-49 LCD Test Interface
NOTE:⚫

Press [Change] to change the color of the screen. There are three colors: red, blue andgreen.

⚫
4.

Press [Done] to exit the test.

Test the beeper.
Press [Beeper] to test the beeper. Under regular circumstance, press [Beeper] one time and the
instrument will beep one time.

5.

Test the chips.
Press [Chip] → [Start] to enter chip test interface, as Diagram 2-51 shows.

Diagram 2-50 Chip Test Interface

NOTE:

6.

⚫

If the test is passed, the corresponding result shows “pass”.

⚫

If the test is failed, the corresponding result shows “fail”.

Press [Done] to exit the board test.

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SDM3055 Series Digital Multimeter User ManualFirmware Update
The software of the Multimeter can be updated directly via USB flash drive, updating current software
version to desired software version.
Operating Steps:
1.

Copy the update file to the USB flash drive.

2.

Insert USB flash drive to USB host interface on the front panel of the Multimeter.

3.

Press

→

→ [Test/Admin】 → [Firmware Update], then press [Browse] and selectthe update file. Next, press [Update] → [Yes] to start updating the system software.
4.

After accomplishing update, the screen shows message:“Firmware Update Done!” Then you can move the USB flash drive away.

5.

Restart the Multimeter and check the version information.
→

Press

→ [System Setup] → [System Info] to check if the software and hardware

version after updating is in accordance with the desired version. If not, the updating is failed andyou need update once more as the above steps.
6.

After checking, press 【Done】 to exit the system information interface.

NOTE:
Don’t cut off the power during the instrument is updating

System Setup
Press

and

, then select [System Setup] to enter the following interface.

Diagram 2-51 System Setup Interface

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Table 2-18 System Settings Menu Description
Function Menu

Description

Language

Select the display interface language.

Calibration

Recalibration function.

Firmware Update

System firmware update by user.

ScreenSet up the screen protection function.

System Info

View system information.

Done

Return to the higher-level menu.

1.

Select language.
The Multimeter supports two kinds of languages, English and Chinese. Press [Language] to enter
the following interface.

Diagram 2-54 Choose Language

2.

User recalibration.

3.

Set up the time of screen protection.
Press [Screen] to set screen protection as 1 Min, 5 Mins, 15 Mins, 30 Mins, 1 Hour, 2 Hours or 5
Hours according to different demands. Activate the screen saver program and screen saver will
be on if no action is taken within the time that you have selected. Press any button the resume.

4.

View system information.
Press [System Info] to view system information, including startup times, software version,
hardware version, production ID and serial number, as shown in the following diagram.

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Diagram 2-52 System Information66

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AcquireSampling is a process of acquiring and digitizing signal. The optional Trigger methods of theMultimeter include Auto Trigger, Single Trigger and External Trigger.

Press

to enter the interface shown as the following diagram:

Diagram 2-53 Acquire Interface

Table 2-19 Function Menu of triggering parameter
Function Menu

Description

Trg Src

Set the source of trigger.

Slope

Set the slope polarity of external trigger.

Delay

Set the delay.

Samples/Trigger

Set the number of samples or trigger.

VMC Out

Set the polarity of output pulse signal when sampling signal
is finished.

Auto Trigger
Auto Trigger parameters that need to be set up include delay, samples /trigger and VMC out.

Operating Steps:
1.

Press

, then select [Trg Src] → [Auto] or press

on the front panel directly to enable

Auto Trigger.
2.

Set the delay.
Delay is the waiting time after the trigger signal is sent out and before the acquiring starts. Press

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SDM3055 Series Digital Multimeter User Manual[Delay] to select Auto or Manual mode. When choosing Manual mode, Left and Right keys areused to switch the number of a numerical value, Up and Down keys are used to change theselected value.

3.

Set the number of samples or trigger.
Press [Samples/Trigger] to set the sample count. Left and Right keys are used to switch thenumber of a numerical value, Up and Down keys are used to change the selected value.

Sample Count⚫

Sample Count indicates the count of point sampled while the Multimeter getting a signal ofSingle Trigger.

4.

⚫

The range of sampling point should be between 1 and 599999999.

⚫

The default value of Sample Count is 1.

Set the VMC Out.
Press [VMC Out] to choose Positive or Negative polarity.

Single Trigger
Single Trigger parameters that need to be set up include delay, samples /trigger and VMC out.

Operating Steps:
1.

Press

, then select [Trg Src] → [Single] or press

on the front panel directly to enable

Single Trigger. See the diagram below.

Diagram 2-54 Setting interface of Auto Trigger2.

Set the delay.
Press [Delay] to select Auto or Manual mode.

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SDM3055 Series Digital Multimeter User Manual3.

Set the number of samples or trigger.
Press [Samples/Trigger] to set sample count.

4.

Set the VMC Out.
Press [VMC Out] to choose Positive or Negative polarity.

External Trigger
The external trigger signal will be input via EXT TRIG interface on the rear panel. External trigger
parameters that need to be set up include delay, samples /trigger, slope and VMC out.

Operating Steps:
1.

Press

, then select [Trg Src] → [Ext] or press

on the front panel directly to enable

External Trigger.

Diagram 2-55 Setting interface of Ext Trigger2.

Set the polarity of slope.
Press [Slope] to choose Positive or Negative polarity.

3.

Set the delay.
Press [Delay] to choose Auto or Manual mode.

4.

Set the number of samples or trigger.
Press [Samples/Trigger] to set sample count.

5.

Set the VMC Out.
In External Trigger mode, the Multimeter could output a pulse signal through the VM COMP
interface on the rear panel after sampling signal is finished.

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SDM3055 Series Digital Multimeter User Manual

Help System
SDM3055 provides powerful built-in help system. You can recall help information at any time during
using the instrument. You also can get a particularly help for every button on the front panel or menu
softkey by using the built-in help system. Or you can get help about familiar operations with thehelp list.
Press

and

to enter the help list, as the following diagram shows.

Diagram 2-56 Help Menu
Table 2-20 Help System Operating Menu
Function Menu

Description

Up

Move up the cursor and select the help menu.

Down

Move down the cursor and select the help menu.

SelectSelect the help information you want and read it.

Done

Return to the higher menu.

1.

Basic Measure.
Get basic measurement types and methods to connect the leads in different measurements.

2.

Measuring Temperature.
Get the method to measure temperature.

3.

Measuring Capacitance.
Get the method to measure temperature.

4.

Math Function.
Introduce how to use the math function while you are measuring.

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SDM3055 Series Digital Multimeter User Manual5.

Dual-display Function.
Get the method to use the dual-display function while you are measuring.

6.

Saving and Recalling Information.
Introduce how to store and recall the data/parameter/ sensors files.

7.

Optional Multiple Scan Card.
Get help about operating optional multiple scan cards.

8.

The convention and Tips of Softkeys.
Get help about the convention and tips of softkeys.

9.

Technical Support.
Get the method to obtain technical support.

Explanation:⚫

In the help menu interface, you also can move cursor and select the corresponding menu by up
and down direction keys and press ”OK” to read the help information.

⚫

While reading help information, you also can look up and down the information by up and down
direction keys.

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SDM3055 Series Digital Multimeter User ManualMath Function
The Multimeter provides five math functions: Statistics, Limits, dBm, dB and Relative. Choose different
math functions to meet different measurement demands. Math functions can only be used in DC
Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Period and Temperature
measurement. Among these functions, dBm and dB are only used in DC Voltage and AC Voltage
measurement.

Press

to show the operating menu of math functions on the screen, as shown in the following

diagram.

Diagram 2-60 Math Function Menu of DC Voltage

Diagram 2-57 Math Function Menu of AC Current

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Table 2-21 Math Function Menu Description
Function Menu

Settings

Description

Statistics

Reading statistic functions, including: max, min, average,
span, std dev and samples.

LimitsThe Limits function performs Pass/Fail testing according to
the specified upper and lower limits.

dBm

The dBm is based on a calculation of power delivered to areference resistance, 0dBm = 1mW.

dB

The dB measurement is the difference between the input
signal and a stored relative value.

Rel Value

Value/OffTurn on the relative value function and set up the value.
Or turn off the function.

Explanations:⚫

Math function can only be applicable to the main display.

⚫

If measurement function is changed, all math functions will be closed except Statistics.

Statistics
There are many kinds of reading statistic functions, including: Max, Min, Average, Standard deviationand so on. The Statistic function is available for DC Voltage, AC Voltage, DC Current, AC Current,
Resistance, Frequency, Period, Capacitance and Temperature measurement.

Press→ [Statistics] → [Show] to enter the interface shown in the following diagram.

Diagram 2-58 Statistics

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Table 2-22 Statistic Measurement Menu Function Description
Function Menu

Settings

Description

Statistics

Show/HideShow or hide the statistics function interface.

Min

Show the minimum statistics value of current measurement.

AverageShow the average statistics value of current measurement.

Max

Show the maximum statistics value of current measurement.

SpanShow the span of current measurement.

Std dev

Show the std dev statistics value of current measurement.

SamplesShow the maximum statistics value of current measurement.

Clear Readings

Clear all current readings and restart statistics.

Done

Return to the higher-level menu.

Statistics Function:⚫

In statistic function, the first reading is usually set to the maximum or minimum value. When
getting more readings, current displaying value is always the maximum/minimum reading among
all the measured values.

⚫

The maximum, minimum, average and reading quantities are stored in volatile memory.

LimitsLimits function is available to prompt signals beyond ranges according to the upper and lower
parameters. Following are some measurement functions which are able to do limit operation: DC
Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Period, Capacitance andTemperature.
Press→ [Limits] → [On] to enter the interface shown in the following diagram.

Diagram 2-59 Limits

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Table 2-23 Limits Measurement Menu Function Description
Function Menu

Settings

Description

Limits

On/OffTurn on or turn off the Limits function.

Low

Set the desired lower limit.

Center

Set the desired center valueHigh

Set the desired upper limit.

StatusShow the status of limit test.

Low Failures

Show the times that reading is lower than the limit.

High Failures

Show the times that reading is higher than the limit.

Span

Set the desired span.

BeeperOn/OffWhen the beeper is on, if the reading is lower or higher
than limits, the instrument will beep once.

Clear Condition

Clear all current readings and restart to test.

Done

Save all changes and return to the higher-level menu.

1.

How to Set Limits
Select [High], [Low], [Center] or [Span] and then switch to the needed digit by Left or Right
Direction keys and input numerical value by Up and Down Direction keys.

2.

Unit
The unit of Limits is decided by the current measurement function.

3.

Over hint⚫

When the reading is lower than the set lower limit, the color of main display will switch blue tored.

⚫

When the reading is higher than the set higher limit, the color of main display will switch blue
to red.

⚫

When the reading is lower or higher than the set limits, the Beeper will beep once. (Thebeeper is turned on.)The range of Limits function:➢

The Limits range is -120% ~ +120% of the current measurement range.

➢

The upper limit value should be always bigger than the lower limit value.

➢

The upper and lower values are stored in volatile memory. They will be set to default values when
the power is on.

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SDM3055 Series Digital Multimeter User ManualdBm
The dBm function is logarithmic and based on a calculation of power delivered to a reference
resistance, relative to 1 mill watt. Besides, this function only applies to AC voltage and DC voltage
measurements.

Press→ [dB/dBm] → [On] and select [Function dBm] to enter the interface shown in thefollowing diagram.

Diagram 2-60 dBm Function Interface

Table 2-24 dB Measurement Function Menu Function Description
Function Menu

Settings

Description

dB/dBmOn/OffTurn on or turn off dB or dBm function.

Function dBm

Open dBm function and the lower right corner ofthe main display show “dBm”.

Ref R

Set the parameter via direction keys: 50Ω ~ 8000Ω.

Done

Save all changes and return to the higher-level menu.

The computation method of the dBm:
When dBm function is turned on, the measured value of voltage is transformed into dBm according
to the following formula.
dBm = 10 x Log10 [(Reading2 / RREF) / 0.001W]

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SDM3055 Series Digital Multimeter User ManualdB
Each dB measurement is different between the input signal and a stored relative value, with both
values converted to dBm. The dB function applies to AC voltage and DC voltage measurements only.

Press→ [dB/dBm On] and select [shown in the following diagram. Function dB] to enter theinterface

Diagram 2-61 dB Function Interface

Table 2-25 dB Measurement Function Menu Function Description
Function Menu

Settings

Description

dB/dBmOn/OffTurn on or turn off dB or dBm function.

Function dB

Open dB function and the lower right corner of the main display
show “dB”.

Ref R

Set the parameter via direction keys: 50Ω ~ 8000Ω.

dB Ref / Value

Set the referred value of dB.

Measure /Ref ValueDone

Set the referred value of measurement.
Save all changes and return to the higher-level menu.

The computation method of the dB:
dB = 10 x Log10 [(Reading2/ RREF) / 0.001W] – (dB setting value)
RREF expressed measuring the resistance value in the actual electric circuit. Range of the dB setting
value: -120 dBm ~ +120 dBm. The default is 0 dBm.

dB value:⚫

Input a value in dB setting interface by direction button, and then store it as dB setting value.

⚫

Settings of dB value are stored in volatile memory.

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Relative Value
Relative value is used for relative measurement. Actual measurement reading is the depression
between measurement value and preset value.
The Multimeter allows operating for the following parameters: DC Voltage, AC Voltage, DC Current,
AC Current, Resistance, Frequency, Period, Capacitance and Temperature.
Press→ 【Rel Value】 to enter the interface shown in the following diagram.

Diagram 2-62 Relative Operation

Table 2-26 Rel Value Operation Function Menu
Function Menu

Description

Value

Select current measurement value as preset value.

Off

Turn off the relative operation function.

The computation method of the dB:
When dBm function is turned on, the result of relative measurement will show on the screen.
Main display = Measurement value – Preset value

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Display Mode
The Multimeter supports four types of way to view measured data: “Number”, “Bar Meter” “Trend
Chart” and “Histogram”.

NumberPress

andto open the menu of display mode and press [Display] to enter the followinginterface. “Number” is always the selected mode when the Multimeter is turned on.

Diagram 2-67 Number Display Mode

Bar Meter
Operating Steps:
1.

Press [Bar Meter] to enter Bar Meter display mode.

Diagram 2-63 Bar Meter Display Mode

2.

Press [Horizontal Scale] to choose the way to set the vertical scale as Default or Manual mode.

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Table 2-27 To Set the Vertical Scale of Bar Meter manuallyFunction Menu

Description

Low

Set the low value of horizontal scale.

High

Set the high value of horizontal scale.

Center

Set the center value of horizontal scale.

Span

Set the span of horizontal scale.

Done

Save all changes and return to the higher-level menu.

Trend Chart
Operating Steps:
1.

Press [Trend Chart] to enter Trend Chart display mode. The default vertical scale is -2V to 2V
when DC Voltage measurement is selected.

Diagram 2-64 Trend Chart Display Mode

Table 2-28 Trend Chart Display Mode
Function Menu

Description

Display / Trend

Currently selected display mode is Trend Chart.

Recent / AllShow recent or all readings.

Time Setting

Set Trend Chart time axis.

Autoscale Once

Automatically set the horizontal scale once.

Vertical Scale

Choose the mode of Vertical Scale.

Clear Readings

Clear all current readings and restart statistics.

2.

Press [Vertical Scale] to choose the way to set the vertical scale as Default, Auto or Manual mode.
Press [Auto] and the Multimeter will set the vertical scale automatically.

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Diagram 2-70 Auto Vertical Scale

Press [Manual] and you can set the vertical scale manually, as the following diagram shows.

Diagram 2-65 Manual Vertical Scale

Histogram
Operating Steps:
1.

Press [Histogram] to enter Histogram display mode.

Diagram 2-66 Histogram Display Mode

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Table 2-29 Histogram Display Mode
Function Menu

Settings

Display

Currently selected display mode is Histogram.

Histogram
Binning

Set Binning as Auto or Manual mode.

Bin SetSet the parameters of Bin.

Cumulative

On/OffClear

Turn on or off Cumulative function.
Clear all current readings and restart statistics.

Readings

2.

Description

Press [Binning] to choose the way to set Binning as Auto or Manual mode. When in Manual mode,press [Bin Settings] to enter the following interface.

Diagram 2-67 Bin Set Interface
Table 2-30 Bin Set
Function Menu

Settings

Description

Num.Bins

Set the number of Bins, 10, 20, 40, 100, 200 or 400 selected.

Low

Set the low value of horizontal scale.

High

Set the high value of horizontal scale.

Center

Set the center value of horizontal scale.

Span

Set the span of horizontal scale.

Outer Bins
Done

82

On/OffShow the bins beyond the scope or not.
Save all changes and return to the higher-level menu.

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Trigger
The Multimeter supports Trigger function. Pressoron the front panel to trigger theMultimeter by Auto or Single mode. Auto trigger is considered as a default when the power is on.

Auto Trigger
Presson the front panel one time and Auto Trigger will be started to capture continuous

readings automatically. By the time, the black field of the screen will show “● Auto Trigger”. Pressagain and the trigger is stopped.
Single Trigger
Presson the front panel, Single Trigger will be started one time and generate an effective

reading. By the time, the black field of the screen will show “● Single Trigger”.

Explanation:
In Remote Mode, the black field just above the screen will show “●ImmediateTrigger”. Press
to switch back to the local mode and the Multimeter will choose Auto Trigger automatically.

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Hold Measurement Function
Hold Measurement function provides users with a stable reading on the screen of the front panel.
When the test leads are put away, the reading is still held on the screen, which makes users can view
measured history data.

Press

and

to open Hold measurement function interface, the black field just above thescreen will show “●Probe Hold”, as shown in the following diagram.

Diagram 2-68 Hold Measurement Function Interface

Table 2-31 Hold Measurement Function
Function Menu

Settings

Description

Probe Hold

On/OffTurn on or off Probe Hold function.

BeeperOn/OffTurn on or off the Beeper.

Clear List

84

Clear all current readings and restart to statistics.

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Chapter 3

Application Examples

This chapter mainly introduces few application examples to help users control and manipulate
SDM3055 quickly.
⚫

Example 1: Reading Statistic Functions⚫

Example 2: To Eliminate Leads Impedance⚫

Example 3: dBm Measurement⚫

Example 4: dB Measurement⚫

Example 5: Limits Test⚫

Example 6: Thermocouple Setting and Measurement⚫

Example 7: To Use Hold Measurement Function⚫

Example 8: To Use Application Software EasySDM

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SDM3055 Series Digital Multimeter User Manual

Example 1: Reading Statistic Functions
Introduce how to realize the statistic function during measuring. When continually measuring few
readings, the Multimeter will update statistic values constantly.

Operating Steps:
1.

Press

on the front panel to select AC Voltage measurement function and choose a proper

voltage range.
2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-9.

3.

Set the Statistics function parameters.
Press

4.

→ [Statistics] to turn on the statistics function.

Lead test leads into the circuit and start to measure. Statistics will update with the increasementof samples, as the following diagram shows.

Diagram 3-1 Statistics 1

Diagram 3-2 Statistics 2

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Example 2: To Eliminate Leads ImpedanceRelative Operation could eliminate impedance errors from leads when measuring smaller resistance.

Operating Steps:
1.

Press

on the front panel to select 2-Wire Resistance measurement function.

2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-14.

3.

Choose a proper resistance range according to the scope. The default is Auto Range.

4.

Lead impedance will be shown on the screen as follow after connecting with two leads together.

Diagram 3-3 Test Lead Impedance

5.

Set parameters for Relative operation.
Press→ [Rel Value] set relative value as current measured value.

Diagram 3-4 Set Relative Value

6.

Besides, pressing [Rel] on the softkey menu could also open Relative operation.

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Diagram 3-5 Lead Impedance after Operation

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Example 3: dBm MeasurementdBm is commonly used in audio signal measurement. The following will introduce you how to measuredBm value.

Operating Steps:
1.

Press

on the front panel to select AC Voltage measurement function and choose a proper

voltage range.
2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-9.

3.

Set the dBm parameters.
Press→ [Statistics] to turn on the statistics function and set the selective value of dBm asa reference value within supposed circuit by using direction keys: 50Ω.

Diagram 3-6 Select Reference Resistance as Measurement Value

4.

Press [Done] to return to the higher-level menu. At this time, the reading shown on the screen is
the Power value of reference resistance.

Diagram 3-7 dBm Operation Result

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Example 4: dB Measurement
As a common measuring unit, dB has been widely used in electrical engineering, radio science,mechanics, shock and vibration, mechanical power and acoustics areas. The following will introduce
you how to measure dB between two circuits.

Operating Steps:
Method 1:
Measure dBm1 and dBm2 existing in two circuits separately according to Example 3, and then dB
could be got:dB = dBm1-dBm2
Method 2:
1.

Press

on the front panel to select AC Voltage measurement function and choose a proper

voltage range.
2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-9.

3.

Set up dBm2 according to Example 3.

4.

Press

→ [dB/dBm] to turn on the dB function and Set parameters of dB operation (dBm1).

Diagram 3-8 Set the Parameters of dB

5.

Press [Done] to return to the higher-level menu. At this time, the reading shown on the screen is
the power difference between two circuits.

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Diagram 3-9 dB Operation Result

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Example 5: Limits Test
Limits Operation hints you the signal is overstep its range according to the selected High and Low
Limit parameters; meanwhile the beeper makes a sound to alarm (if sound is on.)Operating Steps:
1.

Press

on the front panel to select AC Voltage measurement function and choose a proper

voltage range.
2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-9.

3.

Press

→ [Limits] to set the Limits parameters.

Press [Low] to set the low limit value.

Diagram 3-10 Set the Low Limit Value

Press [High] to set the high limit value.

Diagram 3-11 Set the High Limit Value

4.

Turn on the beeper and start Limits Test. As shown in Diagram 3-11. The measured result is
between the Low and High limits, so the test status is “True”.

5.

If changing the high limit value to 1V, the measured result is not between the Low and High limits.

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So the instrument beep once, and the main display is red. The test status is “Fail” and High
Failures is shown. As the following diagram shows.

Diagram 3-12 Limits Test Result

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Example 6: Thermocouple setting and measurement
Thermocouple is a common temperature sensor. Type, voltage and cold-side temperature are
required for thermocouple measurement.
The instrument can measure temperature of HI and LO terminals (cold-side), and calculate absolutetemperature of hot-side. Besides, only the relationship between thermocouple voltage and cold-side
temperature is need to be input according thermocouple type when you set the thermocouple sensor.

Operating Steps:
1.

Please refer to “To Measure Temperature” in chapter 2 to know about the connection of Sensor.

Diagram 3-13 Sketch map for connecting the sensor

2.

Select the type of thermocouple.
Press [Load] and choose thermocouple measurement. The Multimeter supports 8 kinds of probe
type: B , E , J , K , N , R , S and T.

Diagram 3-14 Select the Type of Thermocouple

3.

Use direction keys to select corresponding file and press [Read] to recall the sensor settings file.

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Diagram 3-15 Select Sensor Settings File

4.

Press [Units] to choose the unit of temperature.

5.

View measured result.
Press [Display] and select display mode of measurement result as “All” to view measurement
value and its corresponding value.

Diagram 3-16 View measured result

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SDM3055 Series Digital Multimeter User Manual

Example 7: To Use Hold Measurement Function
Reading Hold can help user to obtain a stable reading and hold it on the display of Front Panel. The
reading would be held all the same although testing pen had been moved away. Then we will
introduce how to keep the readings displayed on screen.
Operating Steps:
1.

Press

on the front panel to select DC Voltage measurement function and choose a proper

voltage range.
2.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-4.

3.

Press

and

to open Hold measurement function interface.

By the time, the screen will record the result of measuring DC voltage, as shown in the following
diagram.

Diagram 3-17 Result 1

4.

Press

on the front panel to select AC Voltage measurement function and choose a proper

voltage range.
5.

Connect the red lead to terminal Input-HI and black lead to terminal Input-LO as Diagram 2-9. By
the time, the screen will record the result of measuring AC voltage, as shown in the following
diagram.

Diagram 3-18 Result 2
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Example 8: To Use Application Software EasySDM
Remote Control function based on EasySDM enables users to operate instrument remotely. The
software supports basic measurements, Acquire, Statistics, Trend Chart and Histogram, etc. The
method to use the software will be introduced in details as the following steps.
Operating Steps:
1.

Connect the Multimeter to your computer by using USB data wire.

2.

Open the main interface of EasySDM, click [Control] on the upper left corner and choose[Connect] to contact the instrument with the software. As shown in the following diagram.

Diagram 3-19 The Main Interface of EasySDM

3.

Click any button on the operating interface to do corresponding operating.

4.

If you want to exit the remote control, turn off the software, and then press

on the front

panel to close the remote function.

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Chapter 4

Measurement Tutorial

True RMS AC Measurement
The AC measurement of the Multimeter has true RMS response. The power dissipated in a resistor
within a time is proportional to the square of the measured true RMS voltage, independent of wave
shape. The instrument can accurately measure true RMS voltage or current, as long as the wave
shape contains negligible energy above the effective bandwidth.
The AC voltage and AC current functions measure the “AC coupled” true RMS value, which is tomeasure the RMS value of the AC component (DC component is rejected) of the input signal. For
sine waves, triangle waves, and square waves, the AC and AC+DC values are equal since thesewaveforms do not contain a DC offset. See the following table 5-1.

Table 4-1 True RMS AC Measurement of Sine, Triangle and Square waves
Waveform

Crest Factor (C.F.)

Sine

√𝟐

Triangle√𝟑

Square𝑻√𝒕

AC RMS

AC+DC RMS

𝑽

𝑽

√𝟐

√𝟐

𝑽

𝑽

√𝟑

√𝟑

𝑽
𝟏 𝟐
× √𝟏 − (
)
𝑪. 𝑭.
𝑪. 𝑭.

𝑽
𝑪. 𝑭.

Non-symmetrical waveforms, such as pulse trains, contain DC voltages which are rejected by ACcoupled true RMS measurements.
An AC coupled true RMS measurement is desirable in situations where you are measuring small AC
signals in the presence of DC offsets. For instance, measuring AC ripple present on DC power
supplies. There are situations, however, where you might want to know the AC+DC true RMS value.
You can determine this value by combining results from DC and AC measurements as the followingshows. You should perform the DC measurement using 5.5-digit mode for best AC rejection.
𝑹𝑴𝑺(𝑨𝑪+𝑫𝑪) = √𝑨𝑪𝟐 + 𝑫𝑪𝟐

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Crest Factor Errors (non-sinusoidal inputs)
A common misconception is that "since an ac Multimeter is true RMS, its sine wave accuracy
specifications apply to all waveforms." Actually, the shape of the input signal can dramatically affectmeasurement accuracy. A common way to describe signal wave shapes is “crest factor”. Crest factor
is the ratio of the peak value to RMS value of a waveform.
Generally speaking, the greater the crest factor, the greater the energy contained in high frequency
harmonics. All Multimeters have errors that are crest factor dependent. Crest factor errors of
SDM3055 are listed in the AC Characteristics section of chapter 6. (The crest factor errors do not
apply for input signals below 100Hz.)
You can estimate the measurement error due to signal crest factor as shown below:
Total Error = Error (Sine wave) + Error (Crest factor) + Error (Bandwidth)
Error (Sine wave): error for sine wave as shown in chapter 6.
Error (Crest factor): crest factor additional error as shown in chapter 6.
Error (Bandwidth): estimated bandwidth error as shown below:
𝑩𝒂𝒏𝒅𝒘𝒊𝒅𝒕𝒉 𝒆𝒓𝒓𝒐𝒓 =−𝑪. 𝑭.× 𝑭
× 𝟏𝟎𝟎% (% 𝒓𝒆𝒂𝒅𝒊𝒏𝒈)
𝟒𝝅 × 𝑩𝑾

C.F.: signal crest factor
F: fundamental frequency of pulse
BW: effective bandwidth of the Multimeter
Example:Calculate the approximate measurement error for a pulse train input with a crest factor of 2 and afundamental frequency of 20 kHz. For this example, assume 1-year accuracy specifications of theMultimeter: ± (0.05%× reading +0.03%×range).

Total Error = (0.05%×reading+0.03%×range) + (0.05%×range) + (0.8%×reading)= 0.85%×reading + 0.08%×range

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Loading Errors (AC Voltage)
In the AC Voltage function, the input of SDM3055 appears as a 1MΩ resistance in parallel with 100pF
of capacitance. The test lead that you use to connect signals to the Multimeter will also add additional
capacitance and loading. The approximate input resistances of the Multimeter at different frequencies
are listed in the following table.

Table 4-2 Approximate Input Resistances at Different Frequencies
Input Frequency

Input Resistance

100Hz

1MΩ

1kHz

850kΩ

10kHz

160kΩ

100kHz16kΩ

For low frequencies:
𝑬𝒓𝒓𝒐𝒓 (%) =−𝑹𝑺
× 𝟏𝟎𝟎%𝑹𝑺 + 𝟏𝑴𝜴

For high frequencies:
𝑬𝒓𝒓𝒐𝒓 (%) = [𝟏√𝟏 + (𝟐𝝅 × 𝑭 × 𝑹𝑺 × 𝑪𝒎 )− 𝟏 ] × 𝟏𝟎𝟎%

F: input frequency
Rs: source resistance
Cm: input capacitance (100pF) plus test lead capacitance100

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Application of the Analog Filter
The analog filter of the Multimeter can be used to reduce the influence of the AC component in DC
measurement. Generally, the filter may not be required, but sometimes it can improve the DC
measurement. For example, if the measured DC electrical source has a big AC ripple, the analog
filter can reduce the influence.

The analog filter can’t be used to filter the internal noise of the instrument. It has no use in DCI
opening measurement, DCV short measurement or in measurement of the output from a precise DC
calibration instrument. On the contrary, it may lead in additional noise and a bigger reading offset.
The Multimeter should be cleared under the selected range and reading rate to decrease theoffset when using the analog filter. If you cannot clear the instrument, the measured results will
have errors. For other ranges and reading rates, the additional error generated by the filter can beomitted.

Table 4-3 Analog Filter Error in DCV measurement
Range

200mV

2V

20V

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Reading Rate

Additional Analog Filter Error

Slow

10μV

Middle

20μV

Fast

20μV

Slow

15μV

Middle

20μV

Fast

20μV

Slow

0.8mV

Middle

1mV

Fast

1mV

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Table 4-4 Analog Filter Error in DCI measurement
Range

200μA

20mA，2A

200mA

10A

102

Reading Rate

Additional Analog Filter Error

Slow

0.002% range

Middle0.005% range

Fast

0.005% range

Slow0.040% range

Middle0.060% range

Fast

0.080% range

Slow0.004% range

Middle0.010% range

Fast

0.010% range

Slow0.008% range

Middle0.010% range

Fast

0.010% range

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Chapter 5General Troubleshooting

The following is a list of the troubles that you may meet while using the Multimeter and their solutions.
Please handle as the corresponding steps when meeting these troubles. If you still can’t handle them,please contact SIGLENT in time.
1.

2.

3.

4.

If the screen of the Multimeter is still dark with nothing displaying after pressing the power key:
1)

Check if the power has been connected correctly.

2)

Check if the main power switch on the back panel has been turned on already.

3)

Check if the power fuse has blown. Replace it as desired if it has blown.

4)

Restart the Multimeter after all above steps have been done.

5)

If the instrument still can’t start up properly, please contact SIGLENT.

The reading doesn’t change when connecting an AC current signal:
1)

Check if the test lead has been connected to the current jack or LO jack correctly.

2)

Check if the fuse in the current location on the back panel has blown.

3)

Check if the measuring location has switched to the DCI or ACI place correctly.

4)

Check if the input is ACI but the measuring location is in DCI place.

The reading doesn’t change when connecting a DC current signal:
1)

Check if the test lead has been connected to the current jack or LO jack correctly.

2)

Check if the fuse in the current location on the back panel has blown.

3)

Check if the measuring location has switched to the DCI or ACI place correctly.

4)

Check if the input is DCI but the measuring location is in ACI place.

USB Disks can’t be recognized by the instrument.
1)

Check if the USB disk can work properly.

2)Make sure the used USB disk is of Flash type. The instrument doesn’t support USB disks ofhard disk type.

3)

Check if the capacity of the used USB disk is too large. The Multimeter is recommended not
to use USB disks which exceed 4GB.

4)After restarting the instrument, insert the USB disk again to inspect.

5)

If you still can’t use the USB disk properly, please contact SIGLENT.

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Chapter 6

Appendix

Appendix A: Accessories

Standard Accessories:⚫

A Power Cord that fits the standard of destination country.

⚫

Two test leads (black and red)⚫

An USB Cable One backup fuses A Quick Start⚫

An Application software

NOTE:
⚫

We suggest that the length of USB data wire and LAN cable connected to the instrument shouldbe less than 3m to avoid affecting the product performance.

⚫

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All the accessories are available by contacting your local SIGLENT office.

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Appendix B: Warranty summary
SIGLENT warrants that the products that it manufactures and sells will be free from defects inmaterials and workmanship for a period of three years from the date of shipment from an authorized
SIGLENT distributor. If a product proves defective within the respective period, SIGLENT will provide
repair or replacement as described in the complete warranty statement.

To arrange for service or obtain a copy of the complete warranty statement, please contact yournearest SIGLENT sales and service office. Except as provided in this summary or the applicablewarranty statement, SIGLENT makes no warranty of any kind, express or implied, including without
limitation the implied warranties of merchantability and fitness for a particular purpose. In no event
shall SIGLENT be liable for indirect, special or consequential damages.

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Appendix C: Daily Maintenance and Cleaning
Maintenance
When storing or placing the instrument, please avoid the liquid crystal display from direct sunlight fora long time.

NOTE:
To avoid damages to the instrument or probe, please don’t place them in mist, liquid or solvent.

Cleaning
Please often clean the instrument or probe according to the use of them.
⚫

Wipe the external ash of the instrument and probe by a soft rag. Be careful not to scratch thetransparent plastic protective screen when cleaning the liquid crystal screen.

⚫

Use a soft rag that has been soaked by water to clean the instrument after cutting off the power.
Or use 75% isopropyl alcohol of water solvent to get a more thorough cleaning.

NOTE:
⚫

To prevent the surface of the instrument or probe from damages, please don’t use any corrosiveor chemical cleaning reagents.

⚫

Please make sure the instrument is already dry before restarting it to avoid short circuits or
personal injuries caused by water.

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Appendix D: Contact SIGLENTSIGLENT TECHNOLOGIES CO., LTD.
Address: 3F, NO.4 building, Antongda Industrial Zone, 3rd Liuxian Road, 68th District, Baoan District,
Shenzhen, P.R. China
Tel: +86-755-36615186
Fax: +86-755-3591582
Post Code: 518101
E-mail: sales@siglent.com
https://www.siglent.com

North America:
Siglent Technologies NA, Inc
6557 Cochran Rd Solon, Ohio 44139
Tel: 440-398-5800
Fax: 440-399-1211
E-mail: info@siglent.com
Web: www.siglentna.com
Europe:Siglent Technologies Germany GmbH
Staetzlinger Str. 70, 86165 Augsburg, Germany
Tel: +49(0)-821-666 0 111 0
Fax: +49(0)-821-666 0 111 22
E-mail: info-eu@siglent.com
Web: www.siglenteu.com

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About SIGLENTSIGLENT is an international high-tech company, concentrating on R&D, sales,
production and services of electronic test & measurement instruments.

SIGLENT first began developing digital oscilloscopes independently in 2002.
After more than a decade of continuous development, SIGLENT has extended

its product line to include digital oscilloscopes, isolated handheld
oscilloscopes,

function/arbitrary

waveform

generators,

RF/MWsignalgenerators, spectrum analyzers, vector network analyzers, digital multimeters,
DC power supplies, electronic loads and other general purpose test
instrumentation. Since its first oscilloscope was launched in 2005, SIGLENT
has become the fastest growing manufacturer of digital oscilloscopes. We
firmly believe that today SIGLENT is the best value in electronic test &measurement.

Headquarters:
SIGLENT Technologies Co., Ltd
Add: Bldg No.4 & No.5, Antongda Industrial
Zone, 3rd Liuxian Road, Bao'an District,
Shenzhen, 518101, China
Tel: + 86 755 3688 7876
Fax: + 86 755 3359 1582
Email: sales@siglent.com
Website: int.siglent.com

North America:
SIGLENT Technologies America, Inc
6557 Cochran Rd Solon, Ohio 44139
Tel: 440-398-5800
Toll Free: 877-515-5551
Fax: 440-399-1211
Email: info@siglentna.com
Website: www.siglentna.com

Europe:SIGLENT Technologies Germany GmbH

Follow us on
Facebook: SiglentTech

Add: Staetzlinger Str. 70
86165 Augsburg, Germany

Tel: +49(0)-821-666 0 111 0
Fax: +49(0)-821-666 0 111 22
Email: info-eu@siglent.com
Website: www.siglenteu.com

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