GW Instek GDM-8261 User Manual

Dual Measurement Multimeter

GDM-8261

USER MANUAL

GW INSTEK PART NO. 82DM-82610EB1

ISO-9001 CERTIFIED MANUFACTURER

This manual contains proprietary information, which is protected by copyrights. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company.

The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the right to change specifications, equipment, and maintenance procedures at any time without notice.

Good Will Instrument Co., Ltd.

No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan (R.O.C.).

Table of Contents

SAFETY INSTRUCTIONS .................................................... 6

Safety Symbols .................................................... 6

Safety Guidelines ................................................ 7

GETTING STARTED .......................................................... 10

GDM-8261 Characteristics ................................ 11

Front Panel Overview ........................................ 12

Rear Panel Overview ......................................... 18

Set Up ............................................................... 20

BASIC MEASUREMENT .................................................... 23

Basic Measurement Overview ........................... 25

AC/DC Voltage Measurement ........................... 27

AC/DC Current Measurement ........................... 32

2W/4W Resistance Measurement ..................... 34

Diode Test ......................................................... 37

Continuity Test .................................................. 38

Frequency/Period Measurement ....................... 41

Temperature Measurement ............................... 43

DUAL MEASUREMENT .................................................... 49

Dual Measurement ........................................... 49

ADVANCED MEASUREMENT ........................................... 55

Advanced Measurement Overview .................... 56

dBm/dB/W Measurement ................................. 58

Max/Min Measurement..................................... 61

Relative Value Measurement ............................. 62

Hold Measurement ........................................... 64

Compare Measurement ..................................... 65

Math Measurement ........................................... 68

SYSTEM/DISPLAY CONFIGURATION .............................. 74

Refresh Rate Setting .......................................... 75

GDM-8261 User Manual

View Serial Number ........................................... 75

Trigger Setting ................................................... 76

Digital Filter Setting .......................................... 79

Display Setting .................................................. 81

Measurement Configuration Settings ............... 82

ADC Setting ....................................................... 87

Frequency / Period Settings .............................. 91

Identification Settings ....................................... 94

STORE/RECALL ............................................................... 95

Store Measurement Record ............................... 96

Recall Measurement Record .............................. 97

Save Instrument Settings .................................. 98

Recall Instrument Settings ................................ 99

SCANNER (OPTIONAL) ................................................. 101

GDM-SC1 Scanner Specifications ................... 102

Scanner Installation ........................................ 102

Setup Scan ...................................................... 110

Run Scan ......................................................... 117

DIGITAL I/O ................................................................... 120

Digital I/O Terminal Configuration ................. 121

REMOTE CONTROL ....................................................... 127

Configure Interface .......................................... 129

Web Control Interface ..................................... 156

Command Syntax ............................................ 160

Command Set .................................................. 161

FAQ ................................................................................ 205

APPENDIX ...................................................................... 206

Firmware Version ............................................ 207

Fuse Replacement ........................................... 208

Menu Tree ....................................................... 210

Specifications .................................................. 212

EC Declaration of Conformity .......................... 221

Table of Contents

INDEX ............................................................................ 222

GDM-8261 User Manual

WARNING

Warning: Identifies conditions or practices that could result in injury or loss of life.

CAUTION

Caution: Identifies conditions or practices that could result in damage to the GDM-8261 or to other property.

DANGER High Voltage

Attention Refer to the Manual

Protective Conductor Terminal

Earth (ground) Terminal

Do not dispose electronic equipment as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased.

SAFETY INSTRUCTIONS

This chapter contains important safety instructions that you must follow when operating the GDM-8261 and when keeping it in storage. Read the following before any operation to insure your safety and to keep the GDM-8261 in the best possible condition.

Safety Symbols

These safety symbols may appear in this manual or on the GDM-8261.

SAFETY INSTRUCTIONS

General Guideline

CAUTION

 Make sure that the voltage input level does not exceed

DC1000V/AC750V.

 Make sure the current input level does not exceed 10A.  Do not place any heavy object on the GDM-8261.  Avoid severe impact or rough handling that can lead to

damaging the GDM-8261.

 Do not discharge static electricity to the GDM-8261.  Use only mating connectors, not bare wires, for the

terminals.

 Do not block or obstruct the cooling fan vent opening.  Do not perform measurement at the source of a

low-voltage installation or at building installations (Note below).

 Do not disassemble the GDM-8261 unless you are

qualified as service personnel.

(Note) EN 61010-1:2010 specifies the measurement categories and their requirements as follows. The GDM-8261 falls under category I or II.

 Measurement category IV is for measurement performed at the

source of low-voltage installation.

 Measurement category III is for measurement performed in the

building installation.

 Measurement category II is for measurement performed on the

circuits directly connected to the low voltage installation.

 Measurement category I is for measurements performed on circuits

not directly connected to Mains.

Power Supply

WARNING

 AC Input voltage: 100/120/220/240 V AC ±10%,

45Hz to 66Hz / 360Hz to 440Hz

 The power supply voltage should not fluctuate more

than 10%.

 Connect the protective grounding conductor of the

AC power cord to an earth ground, to avoid electrical shock.

Safety Guidelines

GDM-8261 User Manual

Fuse

WARNING

 Fuse type: 0.315AT 100/120VAC

0.125AT 220/240 VAC

 Make sure the correct type of fuse is installed before

power up.

 To avoid risk of fire, replace the fuse only with the

specified type and rating.

 Disconnect the power cord before fuse replacement.  Make sure the cause of a fuse blowout is fixed before

fuse replacement.

Cleaning the GDM-8261

 Disconnect the power cord before cleaning.  Use a soft cloth dampened in a solution of mild

detergent and water. Do not spray any liquid into the GDM-8261.

 Do not use chemicals or cleaners containing harsh

material such as benzene, toluene, xylene, and acetone.

Operation Environment

 Location: Indoor, no direct sunlight, dust free, almost

non-conductive pollution (Note below)

 Temperature: Full accuracy for 0°C to 55°C.  Humidity: Full accuracy to 80% RH at 40°C

(Note) EN 61010-1:2010 specifies the pollution degrees and their requirements as follows. The GDM-8261 falls under degree 2.

Pollution refers to ―addition of foreign matter, solid, liquid, or

gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity‖.

 Pollution degree 1: No pollution or only dry, non-conductive pollution

occurs. The pollution has no influence.

 Pollution degree 2: Normally only non-conductive pollution occurs.

Occasionally, however, a temporary conductivity caused by condensation must be expected.

 Pollution degree 3: Conductive pollution occurs, or dry,

non-conductive pollution occurs which becomes conductive due to condensation which is expected. In such conditions, equipment is normally protected against exposure to direct sunlight, precipitation, and full wind pressure, but neither temperature nor humidity is controlled.

Storage Environment

 Location: Indoor  Temperature: −40°C to 70°C

Disposal

Do not dispose this instrument as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased. Please make sure discarded electrical waste is properly recycled to reduce environmental impact.

SAFETY INSTRUCTIONS

Green/ Yellow:

Earth

Blue:

Neutral

Brown:

Live (Phase)

Power cord for the United Kingdom

When using the GDM-8261 in the United Kingdom, make sure the power cord meets the following safety instructions.

NOTE: This lead / appliance must only be wired by competent persons

WARNING: THIS APPLIANCE MUST BE EARTHED

IMPORTANT: The wires in this lead are coloured in accordance with the following code:

As the colours of the wires in main leads may not correspond with the coloured marking identified in your plug/appliance, proceed as follows:

The wire which is coloured Green & Yellow must be connected to the Earth terminal marked with either the letter E, the earth symbol or coloured Green/Green & Yellow.

The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.

The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.

If in doubt, consult the instructions provided with the equipment or contact the supplier.

This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, a cable of 0.75mm2 should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.

Any exposed wiring from a cable, plug or connection that is engaged in a live socket is extremely hazardous. If a cable or plug is deemed hazardous, turn off the mains power and remove the cable, any fuses and fuse assemblies. All hazardous wiring must be immediately destroyed and replaced in accordance to the above standard.

GDM-8261 User Manual

Characteristics

GDM-8261 Characteristics ..................................... 11

Panel Overview

Front Panel Overview ............................................. 12

Measurement Keys (upper row) ............................. 13

Measurement Keys (lower row) ............................. 16

Rear Panel Overview .............................................. 18

Setup

Tilt Stand ............................................................... 20

Power Up ............................................................... 21

GETTING STARTED

This chapter describes the GDM-8261 in a nutshell, including an Overview of its main features and front / rear panel introduction. After going through the Overview, follow the Power-up sequence to properly setup the GDM-8261.

Please note the information in this manual was correct at the time of printing. However as GW Instek continues to improve its products, changes can occur at any time without notice. Please see the GW Instek website for the latest information and content.

GETTING STARTED

Performance

 High DCV accuracy: 0.0035%  High current range: 10A  High Voltage range: 1000V  High ACV frequency response: 300kHz

Features

 6

digits

 Multi functions: ACV, DCV, ACI, DCI, 2W/4W R, Hz,

Temp, Continuity, Diode test, MAX/MIN, REL, dBm, Hold, MX+B, 1/X, REF%, dB, Compare, Statistics.

 Manual or Auto ranging  AC true RMS

Interface

 Voltage/Resistance/Diode/Temperature input  Current input  4W sense input  USB device/RS232/GPIB(optional)/LAN(optional)

for remote control

 9-pin digital I/O  16 channel scanner (optional)

Optional Items

 16 channel scanner  GPIB port  Ethernet port

GDM-8261 Characteristics

The GDM-8261 is a portable, dual-display digital multimeter suitable for a wide range of applications, such as production testing, research, and field verification.

GDM-8261 User Manual

Measurement

Keys

Input Hi Terminal

Sense Hi

Terminal

Sense Lo,

DC/AC 1A Terminal

Power Switch

Main

Display

DC/AC 10A Terminal

Input Lo Terminal

AMPS Fuse

Holder

Main Display

Output On/Off Key

CAT 1000V CAT 600V

ON/OFF

REAROUTCVCCSWEEPFILTRCLSTOCOMP2ND

dBmEXTSHIFTERRLIMITAUTOMATH4W2WDCAC

AVmm

HzWkM

WSFC

mdB

AVmm

HzWkM

WSFC

RMTMAXMINRELHOLDSMFAUTO4W2WDCAC

TEMP

Hz/P2/4WACV DCV ACI DCI

HOLD MX/MNRELTRIGAUTO 2ND

SENSORdBMATHSTORE dBmSTEPSCAN RECALL

MENUREL# FILTERINT/EXTCOMPRATE

ENTER LOCAL

POWER

RANGE CHOICES

/ EXITSHIFT

GDM-8261

MAX

1.2A

MAX

DC1000V AC 750V

MAX 10A

500V

MAX

INPUT

SENSE

FUSE

T1.25A

250V

MAX

200Vpk

COM

Digit Dual Measurement Multimeter

Power Switch

POWER

Turns On or Off the main power. For the power up sequence, see page 21.

Main Display

Shows measurement results and parameters.

For display configuration details, see page 81 (light setting).

Sense Lo

DC/AC 1A Terminal

AMPS Fuse

Holder

FUSE

T1.25A

250V

As a fuse, protects the instrument from over-current. Rating: T1.25A, 250V.

For the fuse replacement procedure, see page 209.

As a sense terminal, accepts 4W Ω

measurement LO connection. For details, see page 33

Also accepts current input

DC: 100μA~1A

AC:1mA~1A

For details see page 32.

Front Panel Overview

GETTING STARTED

Sense HI Terminal

SENSE

Accepts HI sense line in 4W resistance measurement. For details, see page 33.

Input Lo Terminal

500V

MAX

COM

Accepts ground (COM) line in all measurements except the sense line in 4W Resistance (page 33). The maximum withstand voltage between this terminal and earth is 500Vpk.

Input Hi Terminal

MAX

DC1000V AC 750V

INPUT

V W

Used as an input port for all measurements except for DC/AC Current measurements.

DC/AC 10A Terminal

MAX

10A

Accepts DC/AC Current input.

For DCI or ACI details, see page 32.

Main Display Output On/Off key

ON/OFF

Turns the display on or off. When the display is turned off, all panel keys except the Output On/Off key become disabled. The Output On/Off key is On by default.

SHIFT/EXIT

/ EXITSHIFT

The Shift key is used to select the secondary functions assigned to each front panel key. When pressed, the SHIFT indicator appears in the display.

As the Exit key, it gets out of the parameter configuration mode and goes back to the measurement result display mode.

ACV

Measures AC Voltage (page 27).

Measurement Keys (upper row)

GDM-8261 User Manual

SHIFT → ACV (SCAN)

/ EXITSHIFT

ACV

SCAN

Starts the optional scan measurement (page 110).

DCV

Measures DC Voltage (page 27).

SHIFT → DCV (STEP)

/ EXITSHIFT

DCV

STEP

Starts the step measurement (page

110) using the optional scanner.

ACI

Measures AC Current (page 32).

SHIFT → ACI (RECALL)

/ EXITSHIFT

ACI

RECALL

Recalls a normal measurement result, standard deviation measurement readings (page 97) or scan measurement results (page

118).

DCI

Measures DC Current (page 32).

SHIFT → DCI (STORE)

/ EXITSHIFT

DCI

STORE

Stores a measurement result (page

96).

2/4W (Resistance)

2/4W

Measures 2-wire or 4-wire Resistance (page 33).

SHIFT → 2/4W (MATH)

/ EXITSHIFT

2/4W

MATH

Enters the Math measurement mode (page 68).

(Diode/

Continuity)

Tests Diode (page 37) or Continuity (page 38).

GETTING STARTED

SHIFT →

(dBm)

/ EXITSHIFT

dBm

Measures dBm (page 58).

Hz/P (Frequency/ Period)

Hz/P

Measures Frequency or Period (page

41).

SHIFT + Hz/P (dB)

/ EXITSHIFT

Hz/P

Measures dB (page 59).

TEMP (Temperature)

TEMP

Measures Temperature (page 43).

SHIFT + TEMP (SENSOR)

/ EXITSHIFT

TEMP

SENSOR

Selects the type of thermocouple used in the Temperature measurement (page 44).

GDM-8261 User Manual

AUTO/ENTER

AUTO

ENTER

As the AUTO key, selects the measurement range automatically.

As the Enter key, confirms the entered value.

SHIFT → AUTO (RATE)

/ EXITSHIFT

AUTO

RATE

ENTER

Selects the measurement update rate: Slow, Medium, or Fast (page

25).

Up/Down

RANGE

Selects the parameter in various occasions: higher ( ) or lower ( ).

HOLD

Activates the Hold function (page

64).

SHIFT → HOLD (COMPare )

/ EXITSHIFT

HOLD

COMP

Activates the Compare measurement (page 65).

TRIG (Trigger)

TRIG

Triggers sample acquisition manually (page 76).

SHIFT → TRIG (Int/Ext Trigger)

/ EXITSHIFT

TRIG

INT/EXT

Selects the Internal or the External trigger source (page 76).

Left/Right

HOLD TRIG

CHOICES

Selects parameters in various menus: left ( ) or right ( ).

REL

Measures the Relative value (page

62).

Measurement Keys (lower row)

GETTING STARTED

SHIFT → REL (RELative base )

/ EXITSHIFT

REL

REL#

Manually sets the reference value for the Relative value measurement (page 62).

MX/MN (MAX/ MIN)

MX/MN

Measures the Maximum or the Minimum value (page 61).

SHIFT → MX/MN (FILTER)

/ EXITSHIFT

MX/MN

FILTER

Selects the digital filter type for the signal sampling (page 79).

2nd (Display) / LOCAL

2ND

LOCAL

As the 2nd key, selects the measurement item on the 2nd display (page 49). Pressing and holding for more than 1 second turns off the 2nd display.

As the Local key, releases the remote control and returns the instrument to local panel operation (page 129).

SHIFT → 2nd (Menu)

/ EXITSHIFT

2ND

LOCAL

Enters the configuration mode for; System Settings, Measurement Settings, ADC Settings, Frequency/Period Settings, I/O Settings, TX TERM Settings and Scanner Settings.

GDM-8261 User Manual

RS232

CAL KEY

DIGITAL I / O

SER.NO. LABEL

50 , 60 , 400Hz

25VA MAX.

LINE RATING

FUSE LINE

100VAC 120VAC

220VAC 240VAC

0.315AT

0.125AT

TEST LEADS BEFORE REPLACING FUSE

DISCONNECT POWER CORD AND

16 CHANNEL

SCANNER

MAX. RATING

250V , 2A

RS-232C

Port

Optional

Scanner Port

Power Cord

Socket

Fuse

0.315AT/

0.125AT

CAL Key

Port

Optional

Communication port

USB Device

Port

Digital I/O

Port

Power Cord Socket

100

220

120

240

Accepts the power cord. AC 100/120/220/240V ±10%, 45Hz~66Hz, 360Hz~440Hz.

For power on sequence, see page 21.

Fuse Socket

100

220

120

240

Holds the main fuse:

100/120 VAC: 0.315AT

220/240 VAC: 0.125AT

For fuse replacement details, see page

208.

RS-232C port

RS232

Accepts an RS-232C cable for remote control; DB-9 male connector.

For remote control details, see page

130.

Rear Panel Overview

GETTING STARTED

USB device port

Accepts a USB device cable for remote control; Type A, female connector.

For remote control details, see page

129.

CAL key port

CAL KEY

Reserved for internal purposes such as firmware updates and calibration.

Digital I/O port

DIGITAL I / O

Accepts a digital I/O cable for the Hi/Lo limit tests; DB-9 pin, female connector.

For digital I/O details, see page 121.

Optional slot x1

Accepts the optional 16 channel scanner module. For scanner details, see page 101.

16 CHANNEL

SCANNER

MAX. RATING

250V , 2A

Optional Communication port

Accepts an optional GPIB or Ethernet card.

Set Up

Tilt stand steps

Pull out the handle sideways and rotate it.

Place the unit horizontally,

Or in the tilt stand position.

Place the handle vertically for hand carry.

Tilt Stand

GDM-8261 User Manual

Power Up

Steps

1. Ensure the correct line voltage is

lined up with the arrow on the fuse holder. If not, see page 208 to set the line voltage and fuse.

10 0

22 0

2. Connect the power

cord to the AC Voltage input.

Note

Make sure the ground connector on the power cord is connected to a safety ground. This will affect the measurement accuracy.

3. Push to turn on the

main power switch on the front panel.

































4. The display shows the model name and the version

for a few seconds. Example: GDM-8261, V1.00

5. Followed by the default measurement settings.

6. And the interface I/O settings.

GETTING STARTED

GDM-8261 User Manual

7. Then the default setting appears.

Example: DCV, Auto, 100mV range

SDC

AUTO

BASIC MEASUREMENT

ACV

DCV

ACI

DCI

2/4W/Hz/P

TEMP

Overview

Basic Measurement Overview ................................ 25

Refresh Rate ........................................................... 25

Reading Indicator ................................................... 26

Manual/Automatic Triggering ................................ 27

Voltage

AC/DC Voltage Measurement ................................. 27

Select Voltage Range .............................................. 28

Voltage Conversion Table ....................................... 30

Crest Factor Table ................................................... 31

Current

AC/DC Current Measurement ................................ 32

Select Current Range .............................................. 33

Resistance

2W/4W Resistance Measurement ........................... 34

Select Resistance Range ......................................... 35

Diode

Diode Test .............................................................. 37

Continuity

Continuity Test ....................................................... 38

Set Continuity Threshold ........................................ 39

Select Beeper Setting ............................................. 40

Frequency/ Period

Frequency/Period Measurement ............................ 41

Select Frequency/Period Voltage Range ................. 42

continued next page

BASIC MEASUREMENT

GDM-8261 User Manual

Temperature

Temperature Measurement .................................... 43

Select Thermocouple Type ..................................... 44

Set Reference Junction Temperature (T-CUP) ........ 45

Select Temperature Sensor Type ............................ 46

Set User RTD ......................................................... 47

BASIC MEASUREMENT

Background

Basic measurement refers to the eight types of measurements assigned to the upper row keys on the front panel.

ACV

DCV

ACI

DCI

2/4W/Hz/P

TEMP

Measurement type

ACV

AC Voltage

DCV

DC Voltage

ACI

AC Current

DCI

DC Current

2/4W

2-wire and 4-wire Resistance

Diode/Continuity

Hz/P

Frequency/Period

TEMP

Celsius/Fahrenheit Temperature

Advanced measurement

Advanced measurement (page 55) mainly refers to the operation using the result obtained from one or more of the basic measurements.

Background

Refresh rate defines how frequently the GDM-8261 captures and updates measurement data. A faster refresh rate yields a lower accuracy and resolution. A slower refresh rate yields a higher accuracy and resolution. Consider these tradeoffs when selecting the refresh rate.

For DC measurements, the frequency of the refresh rate depends on the rate settings (S, M, F) and the ADC speed settings (Accurate, Quick) (page 90 ).

For AC measurements, the refresh rate (S, M, F) is directly tied to the AC bandwidth settings (page 84).

For further details, please see the specifications.

Basic Measurement Overview

Refresh Rate

GDM-8261 User Manual

Refresh Rate

Function

S M F

(Readings/s)

Continuity / Diode

100

200

300

DCV/DCI/100Ω~ 100MΩ (Accurate)

240

DCV/DCI/100Ω~ 100MΩ (Quick)

600

2400

ACV/ACI

1.2

(sec/reading)

3.38

Frequency / Period

100

Selection steps

1. Press the Shift key followed by

the AUTO (RATE) key. The refresh rate switches to the next.

/ EXITSHIFT

AUTO

RATE

2. The refresh rate indicator shows

the current status.

S→M→F→S

Background

The reading indicator next to the 1st display flashes according to the refresh rate setting.

When no data is captured

When there is no captured data, the reading indicator flashes once every two seconds (slower than the normal refresh rate), indicating the DMM is in standby mode.

Reading Indicator

BASIC MEASUREMENT

Automatic triggering (default)

The GDM-8261 triggers according to the refresh rate. See the previous page for refresh rate setting details.

Manual triggering

Press the Trig key to trigger measurement manually. The trigger must be set to external (EXT) for manual triggering. See page 76.

TRIG

Voltage type

0 ~ 750V

0 ~ 1000V

1. Activate ACV/ DCV

Press the ACV (AC Voltage) key or DCV (DC Voltage) key.

ACVorDCV

2. ACV/DCV mode display appears

SAC AUTO

AC or DC + V

Indicates AC, DC voltage

AUTO

Indicates Automatic range selection

100mV

2nd display shows the Voltage range

3. Connect the test lead and measure

Connect the test lead between the V and the COM port. The display updates the reading.

INPUT

V W

COM

Manual/Automatic Triggering

AC/DC Voltage Measurement

GDM-8261 User Manual

Auto range

To turn the automatic range selection On/Off, press the AUTO key.

AUTO

Manual range

Press the Up or the Down key to select the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range.

Selection list

Range

Resolution

Full scale @ slow rate

100mV

0.1µV

119.9999mV

1µV

1.199999V

10V

10µV

11.99999V

100V

100µV

119.9999V

750V (AC)

1mV

750.000V

1000V (DC)

1mV

1000.000V

Note:

For more detailed parameters, see the specification s on page 212.

DC Voltage Range Note:

DC voltages with AC components cannot be accurately measured if the DC+AC component exceed the ADC dynamic range for the selected DC range. Any voltage exceeding the ADC dynamic range will be clipped at the upper/lower range limit. Under these conditions the range that is chosen with the Auto range function may be too small.

Example:

+2V

-2V

C D

DC 1V Range

A,B: Input exceeds the ADC dynamic range.

C,D: The DCV offset causes the input to exceed the upper ADC dynamic range.

E: The DCV offset causes the input to exceed the lower ADC dynamic range.

Select Voltage Range

BASIC MEASUREMENT

The DC voltage range should be manually selected when any of the following conditions are true:

1. When DCV measurement is used.

2. When the signals being measured contain both DC

and AC components.

3. When the amplitude of the AC component in the

measured signal is higher or lower than the dynamic range of the range being currently selected by auto-range function.

DCV Voltage Range Selection List

DCV Range

ADC Dynamic Range

DC100mV

max±200mV

DC1V

max±2V

DC10V

max±20V

DC100V

max±200V

DC1000V

max±1000V

GDM-8261 User Manual

Waveform

Peak to Peak

(True RMS)

Sine

PK-PK

2.828

1.000

0.000

Rectified Sine (full wave)

PK-PK

1.414

0.435

0.900

Rectified Sine (half wave)

PK-PK

2.000

0.771

0.636

Square

PK-PK

2.000

1.000

0.000

Rectified Square

PK-PK

1.414

0.707

Rectangular Pulse

PK-PK

2.000

( DD 

D=X/Y

Triangle Sawtooth

PK-PK

3.464

1.000

0.000

Voltage Conversion Table

This table shows the relationship between AC and DC reading in various waveforms.

+ 194 hidden pages