GW Instek GDM-8251, GDM-8255 User Manual

Digital Multimeter

GDM-8200 Series

USER MANUAL

GW INSTEK PART NO. 82DM-82550M01

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 rights to change specification, equipment, and maintenance procedures at any time without notice.

Good Will Instrument Co., Ltd.

No. 7-1, Jhongsing Rd., Tucheng City, Taipei County 236, Taiwan.

Table of Contents

SAFETY INSTRUCTIONS ................................................... 5

Safety Symbols ....................................................5

Safety Guidelines ................................................6

GETTING STARTED........................................................... 9

GDM-8200 Series Lineup ..................................10

GDM-8200 Series Characteristics ..................... 11

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

Rear Panel Overview ......................................... 17

Set Up ...............................................................19

BASIC MEASUREMENT ....................................................21

Basic Measurement Overview ...........................22

AC/DC/AC+DC Voltage Measurement .............. 24

AC/DC/AC+DC Current Measurement ..............28

2W/4W Resistance Measurement ..................... 30

Diode Test .........................................................32

Continuity Test ..................................................33

Frequency/Period Measurement .......................36

Temperature Measurement ...............................37

ADVANCED MEASUREMENT...........................................40

Advanced Measurement Overview .................... 41

dBm/dB Measurement......................................43

Max/Min Measurement.....................................45

Relative Value Measurement............................. 46

Hold Measurement ...........................................48

Compare Measurement.....................................49

Math Measurement...........................................52

Dual Display Measurement............................... 56

SYSTEM/DISPLAY CONFIGURATION ..............................57

Refresh Rate Setting..........................................58

Trigger Setting...................................................59

GDM-8200 Series User Manual

Digital Filter Setting ..........................................62

Display Light Setting .........................................64

STORE/RECALL ............................................................... 65

Store Measurement Record...............................65

Recall Measurement Record..............................66

Recall Factory Installed Setup ...........................67

SCANNER (OPTIONAL) .................................................. 68

Scanner Installation ..........................................69

Setup Scan ........................................................76

Run Scan ...........................................................82

DIGITAL I/O.................................................................... 85

Digital I/O Terminal Configuration ...................86

REMOTE CONTROL ........................................................ 90

Configure Interface............................................91

Command Syntax ..............................................95

Command Set.................................................... 96

FAQ ................................................................................104

Appendix ........................................................................105

System Information.........................................105

Fuse Replacement ...........................................107

Specification....................................................109

EC Declaration of Conformity..........................115

INDEX ............................................................................116

SAFETY INSTRUCTIONS

This chapter contains important safety instructions that you must follow when operating GDM-8200 series and when keeping it in storage. Read the following before any operation to insure your safety and to keep the best condition for GDM-8200 series.

Safety Symbols

These safety symbols may appear in this manual or on GDM-8200 series.

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 GDM-8200 series or to other properties.

DANGER High Voltage

Attention Refer to the Manual

Protective Conductor Terminal

Earth (ground) Terminal

GDM-8200 Series User Manual

Safety Guidelines

• 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 GDM-8200 series.

• Avoid severe impacts or rough handling that leads to

damaging GDM-8200 series.

• Do not discharge static electricity to GDM-8200 series.

• 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

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

• Do not disassemble GDM-8200 series unless you are

qualified as service personnel.

General Guideline

CAUTION

(Note) EN 61010-1:2001 specifies the measurement categories and their requirements as follows. GDM-8200 series 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: 100–240 V AC, 50–60Hz

• 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.

Fus e

WARNING

• Fuse type: T3.15A/ 250V, 20VA

• Make sure the correct type of fuse is installed before

power up.

• To ensure fire protection, replace the fuse only with

the specified type and rating.

• Disconnect the power cord before fuse replacement.

• Make sure the cause of fuse blowout is fixed before

fuse replacement.

SAFETY INSTRUCTIONS

Cleaning GDM-8200 series

• 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 GDM-8200 series.

• Do not use chemical or cleaner containing harsh

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

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

non-conductive pollution (Note below)

• Relative Humidity: < 75%

• Altitude: < 2000m

• Temperature: 0°C to 40°C (operation), 18°C to 28°C

(full accuracy)

Operation Environment

(Note) EN 61010-1:2001 specifies the pollution degrees and their requirements as follows. GDM-8200 series 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

• Relative Humidity: < 75% (0~35°C), <50% (35~50°C)

• Tem pera tur e: −10°C to 70°C

GDM-8200 Series User Manual

Power cord for the United Kingdom

When using GDM-8200 series 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:

Green/ Yellow: Earth

Blue: Neutral

Brown: Live (Phase)

As the colours of the wires in main leads may not correspond with the colours 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 the letter E or by the earth symbol

or coloured Green

or 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, 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 moulded mains connector that requires removal /replacement must be destroyed by removal of any fuse & fuse carrier and disposed of immediately, as a plug with bared wires is hazardous if a engaged in live socket. Any re-wiring must be carried out in accordance with the information detailed on this label.

GETTING STARTED

This chapter describes GDM-8200 series in a nutshell, including its main features, package contents, and front / rear / display panel introduction. After going through the overview, follow the Power-up sequence and Functionality check section to properly setup GDM-8200 series.

Characteristics GDM-8200 Series Lineup .......................................10

GDM-8200 Series Characteristics...........................11

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

Measurement keys (Upper row) .............................13

Measurement keys (Lower row) .............................15

Rear Panel Overview...............................................17

Setup Tilt Stand................................................................19

Power Up................................................................20

GDM-8200 Series User Manual

GDM-8200 Series Lineup

GDM-8200 series consists of two models: GDM-8251 and GDM-8255.

Appearance

Both two models are identical except for the model name and the meter count of the 1

display.

Model Name

1st Display

Models GDM-8251

1st display meter: 120,000 counts

GDM-8255

1st display meter: 199,999 counts

GETTING STARTED

GDM-8200 Series Characteristics

GDM-8200 series are portable, dual-display digital multimeters suitable for wide range of applications, such as production testing, research, and field verification.

Performance

• High DCV accuracy: 0.012%

• High current range: 10A

• High Voltage range: 1000V

• High ACV frequency response: 100kHz

Feat ures

• 120000 meter count (GDM-8251)

• 199999 meter count (GDM-8255)

• Multi functions: ACV, DCV, ACA, DCA, 2W/4W R,

Hz, Continuity, Diode test, MAX/MIN, REL, dBm, HOLD, AutoHold, Compare.

• Manual or Auto ranging

• AC true RMS or AC + DC true RMS

• Auto recall of the setting upon power On

Interface

• Voltage/Resistance/Diode/Temperature input

• Current input

• 4W sense input

• USB host/RS232/GPIB(optional) for remote control

• 9-pin digital I/O

• 16 channel scanner x2 (optional)

Optional Items

• GPIB module

• 16 channel scanner x 2

GDM-8200 Series User Manual

Front Panel Overview

Measurement

key

Main Terminal

4W Ohm Terminal

Fuse

Power Switch

Main

Display

DCI/ACI Terminal

Output

On/Off key

COM Terminal

Power Switch

Turns O n or Off the main power. For power up sequence, see page20.

Main Display

Shows measurement results and parameters.

For display configuration details, see page64 (light setting).

Input fuse / 4W Ω sense LO terminal

As a fuse, protects the instrument from over-current. Rating: T0.1A, 250V.

For fuse replacement procedure, see page108.

As a sense terminal, accepts 4W Ω measurement LO connection. For details, see page30.

4W Ω Sense HI Term in al

Accepts HI sense line in 4W resistance measurement. For details, see page30.

GETTING STARTED

COM Terminal

Accepts ground (COM) line in all measurements except the sense line in 4W Resistance (page30).

Voltag e/ 2W Ω /

(Diode)

Term in al

Accepts input in all measurements except for DC/AC Current and 4W Resistance sense line.

Current Terminal

Accepts DC/AC Current input.

For DCI/ACI details, see page28.

Output On/Off key (Reserved)

Reserved for the future use in the optional Power source module.

Measurement keys (Upper row)

SHIFT/EXIT

As the Shift key, selects the second functionality assigned to each front panel key. When pressed, the indicator appears in the display.

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

ACV

Measures AC Voltage (page24).

SHIFT → ACV (SCAN)

Starts the optional scan measurement (page76).

DCV

Measures DC Voltage (page24).

GDM-8200 Series User Manual

SHIFT → DCV (STEP)

Starts the step measurement (page76) using the optional scanner.

ACV + DCV

When the ACV key and the DCV key are pressed together, they measure AC+DC Voltage (page24).

ACI

Measures AC Current (page28).

SHIFT → ACI (RECALL)

Recalls a normal measurement result (page66) or a scan measurement result (page83).

DCI

Measures DC Current (page28).

SHIFT → DCI (STORE)

Stores a measurement result (page65).

ACI + DCI

When the ACI key and the DCI key are pressed together, they measure AC+DC Current (page28).

2/4W (Resistance)

Measures 2-wire or 4-wire Resistance (page30).

SHIFT → 2/4W (MATH)

Enters the Math measurement mode (page52).

(Diode/

Continuity)

Tests Diode (page32) or Continuity (page33).

SHIFT → / (dBm)

Measures dBm (page43).

Hz/P (Frequency/ Period)

Measures Frequency or Period (page36).

SHIFT + Hz/P (dB)

Measures dB (page44).

GETTING STARTED

°C/°F (Temperature)

Measures Temperature (page37).

SHIFT + °C/°F (SENSOR)

Selects the type of thermocouple used in the Temperature measurement (page38).

Measurement keys (Lower row)

AUTO/ENTER

As the AUTO key, selects the measurement range automatically.

As the ENTER key, confirms the entered value.

SHIFT → AUTO (RATE)

Selects the measurement update rate: Slow, Medium, or Fast (page22).

Up/Down

Selects the parameter in various occasions: higher (

) or lower ( ).

HOLD

Activates the Hold function (page48).

SHIFT → HOLD (COMPare)

Activates the Compare measurement (page49).

TRIG (Trigger)

Triggers sample acquisition manually (page59).

SHIFT → TRIG (Int/Ext Trigger)

Selects the Internal or the External trigger source (page59).

Left/Right

Selects the parameter in various occasions: left (

) or right ( ).

REL

Measures the Relative value (page46).

SHIFT → REL (RELative base)

Manually sets the reference value for the Relative value measurement (page46).

GDM-8200 Series User Manual

MX/MN (MAX/ MIN)

Measures the Maximum or the Minimum value (page45).

SHIFT → MX/MN (FILTER)

Selects the digital filter type for the signal sampling (page62).

2ND (Display) / LOCAL

As the 2nd key, selects the measurement item on the 2

display (page56). Pressing and holding for more than 1 second turns off the 2

display.

As the Local key, releases the remote control and goes back to the local panel operation (page91).

SHIFT → 2ND (Menu)

Enters the configuration mode. Configures or displays the following items: Display (page57), Beep (page35), Continuity threshold (page34), Scanner (page76), Digital I/O (page85), and System information (page105).

GETTING STARTED

Rear Panel Overview

GPIB Port (Optional)

RS-232C

Port

Optional Item

Slot x2

Power Cord

Socket

Fuse

T3.15A/250V

CAL Key

Port

Digital I/O

Port

USB Host

Port

Power Cord Socket

Accepts the power cord. AC 100–240V, 50–60Hz.

For power on sequence, see page20.

Fuse Socket

Holds the main fuse: T3.15A 250V, 20VA.

For fuse replacement details, see page107.

RS-232C port

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

For remote control details, see page92.

USB host port

Accepts a USB host cable for remote control; Type A, male connector.

For remote control details, see page91.

CAL key port

CAL KEY

Reserved for internal uses as in firmware update and calibration.

GDM-8200 Series User Manual

Digital I/O port

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

For digital I/O details, see page86.

GPIB port (optional)

Factory installed optional GPIB interface. Accepts a GPIB cable for remote control; 24 pin, female.

For remote control details, see page93.

Optional slot x2

Accepts up to two optional scanner modules. 16 channels are available per scanner. When two modules are used, maximum 32 channels are available.

For scanner details, see page68.

GETTING STARTED

Set Up

Tilt Stand

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.

GDM-8200 Series User Manual

Power Up

Power up steps

1. Connect the power

cord to the AC Voltage input.

Note

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

2. Push and turn On the

main power switch on the front panel.

3. The display shows the model name and the version

for a few seconds. Example: GDM-8255, V1.0

4. Then the default setting appears.

Example: DCV, Auto, 1V range

BASIC MEASUREMENT

Overview Basic Measurement Overview ................................22

Common attribute: refresh rate..............................22

Common attribute: reading indicator .....................23

Common attribute: manual/automatic triggering ..23

Voltage AC/DC/AC+DC Voltage Measurement....................24

Select Voltage range...............................................25

Voltage conversion table ........................................26

Crest factor table....................................................27

Current AC/DC/AC+DC Current Measurement ...................28

Select Current range...............................................29

Resistance 2W/4W Resistance Measurement...........................31

Diode Diode Test ..............................................................33

Continuity Continuity Test .......................................................33

Set continuity threshold .........................................34

Select beeper setting ..............................................35

Freque ncy/ Period

Frequency/Period Measurement.............................36

Temperature Temperature Measurement ....................................37

Select thermocouple type .......................................38

Set reference junction temperature ........................39

GDM-8200 Series User Manual

Basic Measurement Overview

Background

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

Measurement type ACV

AC Voltage

DCV

DC Voltage

ACV+DCV

AC+DC Voltage

ACI

AC Current

DCI

DC Current

ACI+DCI

AC+DC Current

2/4W

2-wire and 4-wire Resistance

Diode/Continuity

Hz/P

Frequency/Period

°C/°F

Celsius/Fahrenheit Temperature

Advanced measurement

Advanced measurement (page40) mainly refers to the operation using the result obtained from one or more of the basic measurement.

Common attribute: refresh rate

Background

Refresh rate defines how frequently GDM-8200 series captures and updates the measurement data. Faster refresh rate yields better accuracy but lower resolution. Slower refresh rate yields lower accuracy but higher resolution. Consider these trade-offs when selecting the refresh rate.

Range S

5 ½ digits

4 ½ digits

3 ½ digits

BASIC MEASUREMENT

Selection step

1. Press the Shift key followed by

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

2. The refresh rate indicator shows

the current status.

→ → →

Common attribute: reading indicator

Background

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

Common attribute: manual/automatic triggering

Automatic triggering (default)

GDM-8200 series 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.

GDM-8200 Series User Manual

AC/DC/AC+DC Voltage Measurement

Vol tage typ e AC (true RM S)

0 ~ 750V

0 ~ 1000V

AC+DC

0 ~ 1000V

(AC RMS)2+(DC)

*AC+DC=

1. Activate ACV/ DCV

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

For AC+DC Voltage, press the ACV key and the DCV key together.

2. ACV/DCV mode display appears

AC(DC) + V Indicates AC, DC, 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.

COM

Note

When measuring in1000V (maximum) range immediately followed by 100uV (minimum) range, an error might occur due to extreme range switching. In such case, take at least one minute in between as an interval.

BASIC MEASUREMENT

Select Voltage range

Auto range

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

Manual range

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

Resolution / Full scale @ slow rate Selection list Range

Resolution Full scale

(GDM-8251)

Full scale (GDM-8255)

100mV

1µV 120.000mV 199.999mV

10µV 1.20000V 1.99999V

10V

100µV 12.0000V 19.9999V

100V

1mV 120.000V 199.999V

750V (AC)

10mV 750.0V 750.0V

1000V

(DC, AC+DC)

10mV 1000.0V 1000.0V

Note

For more detailed parameters, see the specification at page109.

GDM-8200 Series User Manual

Voltage conversion table

This table shows the relationship between AC, DC, and AC+DC reading in various wavefor ms.

Waveform Peak to Peak AC

(True RMS)

DC AC + DC

(True RMS)

Sine

PK-PK

2.828 1.000 0.000 1.000

Rectified Sine (full wave)

PK-PK

1.414 0.435 0.900 1.000

Rectified Sine (half wave)

PK-PK

2.000 0.771 0.636 1.000

Square

PK-PK

2.000 1.000 0.000 1.000

Rectified Square

PK-PK

1.414 0.707 0.707 1.000

Rectangular Pulse

PK-PK

2.000 2K

K=√( D-D

)

D=X/Y

2√D

D=X/Y

Tria ng le Sawtooth

PK-PK

3.464 1.000 0.000 1.000

BASIC MEASUREMENT

Crest factor table

Background

Crest factor is the ratio of the peak signal amplitude to the RMS value of the signal. It determines the accuracy of AC measurement. If the crest factor is less than 3.0, voltage measurement will not result in error due to dynamic range limitations at full scale. If the crest factor is more than 3.0, it usually indicates abnormal waveform as seen from the below table.

Waveform Shape Crest factor

Square wave

1.0

Sine wave

1.414

Tr ia ng le sawtooth

1.732

Mixed frequencies

1.414 ~ 2.0

SCR output 100% ~ 10%

1.414 ~ 3.0

White noise

3.0 ~ 4.0

AC Coupled pulse train

3.0

Spike

>9.0

GDM-8200 Series User Manual

AC/DC/AC+DC Current Measurement

Current type AC (true RMS)

0 ~ 10A

AC+DC

0 ~ 10A

(AC RMS)2+(DC)

*AC+DC=

1. Activate ACV/ DCV

Press the ACI (AC Current) key or the DCI (DC Current) key.

For AC+DC Current, press the ACI key and the DCI key together.

2. ACI/DCI mode display appears

AC(DC) + A Indicates AC, DC, AC+DC Current

AUTO Indicates Automatic range selection

10acA 2nd display shows the Current range

10A breaks into 10acA (AC) or 10dcA (DC)

3. Connect the test lead and measure

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

COM

BASIC MEASUREMENT

Select Current range

Auto range

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

Manual range

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

Resolution / Full scale @ slow rate Selection list Range

Resolution Full scale

(GDM-8251)

Full scale (GDM-8255)

10mA

0.1µA 12.0000mA 19.9999mA

100mA

1µA 100.000mA 100.000mA

10A

100µA 10.0000A 10.0000A

Note

*10A range is not available for AC+DC Current. For more detailed range, see the specification at page111.

GDM-8200 Series User Manual

2W/4W Resistance Measurement

Measurement type

2-wire

Uses the standard V-COM ports. Recommended for measuring resistances larger than 1kΩ.

4-wire

Compensates the test lead effect using the 4W compensation ports,, in addition to the standard V-COM ports. Recommended for measuring sensitive resistances smaller than 1kΩ.

For 2-wire resistance measurement, press the 2W/4W key once.

1. Activate resistance measurement

For 4-wire resistance measurement, press the 2W/4W key twice.

2. 2W resistance mode display appears

2W(4W) + Ω

Indicates 2W(4W) Resistance

AUTO Indicates Automatic range selection

10M 2nd display shows the Resistance range

3. Connect the test lead and measure

Connect the test lead. For 2-wire resistance, use the V and the COM port. For 4-wire resistance, use the V and the COM port, plus the 4W sense, and LO port for sensing. The display updates the reading.

2W connection

COM

4W connection

COM

SENSE

BASIC MEASUREMENT

Select Resistance range

Auto range

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

Manual range

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

Selection list Range Full scale @ slow rate

GDM-8251 GDM-8255

100Ω

120.000Ω 199.999Ω

1kΩ

1.2000kΩ 1.9999kΩ

10kΩ

12.0000kΩ 19.9999kΩ

100kΩ

120.000kΩ 199.999kΩ

1MΩ

1.20000MΩ 1.99999MΩ

10MΩ

12.0000MΩ 19.9999MΩ

100MΩ

120.000MΩ 199.999MΩ

Note

For more detailed range, see the specification at page112.

GDM-8200 Series User Manual

Diode Test

Background

Diode test checks the forward bias characteristics of a diode by running a constant forward bias current, 2mA, through the DUT.

1. Activate diode test

Press the key once.

2. Diode mode display appears

+ V Indicates Diode test

DIODE 2nd display shows the title

3. Connect the test lead and measure

Connect the test lead between the V and COM port; Anode-V, Cathode-COM. The display updates the reading.

COM

BASIC MEASUREMENT

Continuity Test

Background

Continuity test checks that the resistance in the DUT is low enough to be considered continuous (of conductive nature).

1. Activate continuity test

Press the key twice.

2. Continuity mode display appears

+ Ω

Indicates Continuity test

CONT 2nd display shows the title

3. Connect the test lead and measure

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

COM

GDM-8200 Series User Manual

Set continuity threshold

Background

Continuity threshold defines the maximum resistance allowed in the DUT when testing the continuity.

Threshold Range

0 ~ 1000Ω, 1Ω resolution, 10Ω default

1. Activate threshold setting

1. Press the Shift key, the 2ND key,

the Right key. The measurement menu appears.

2. Press the Down key, the Right

key, the Enter key. The continuity threshold setting appears.

2. Edit threshold

1. Move the cursor (the flashing

digit) using the Left/Right key.

2. Change the value using the

Up/Down key.

Range:

1 ~ 1000Ω, 1Ω resolution, default 10Ω

3. Go back to the default display

Press the Enter key to confirm the edited threshold. Press the Exit key to go back to the default display.

BASIC MEASUREMENT

Select beeper setting

Background

Beeper setting defines how GDM-8200 series notifies the continuity test result to the user.

Pass

Beeps when the test result is pass

Beeper parameter

Fai l

Beeps when the test result is fail

Off

Beep function is turned Off

1. Activate beeper setting menu

1. Press the Shift key followed by

the 2nd (Menu) key. The system menu appears.

2. Press the Down key followed by

the Right key. The beep menu appears.

3. Press the Down key. The beep

setting appears.

2. Select the beep setting

To change the setting, press the Left/Right key.

Beeper type:

Pass (beep when pass), Fail (beep when fail, default), Off (beep off)

3. Go back to the default display

Press the Enter key to confirm. Press the Exit key to go back to the default display.

GDM-8200 Series User Manual

Frequency/Period Measurement

To measure Frequency, press the Hz/P key once.

1. Activate frequency/period measurement

To measure Period, press the Hz/P key twice.

2. Frequency (Period) mode display appears

Hz (S) Indicates Frequency (period) measurement

FREQ

(PERIOD)

2nd display shows the title

3. Connect the test lead and measure

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

COM

10Hz ~ 800kHz

Frequency range

Sensitivity 10Hz ~ 100kHz: >0.1V

100kHz ~ 600kHz: >1.0V 600kHz ~ 800kHz: >2.5V

Period Range

1.25µs ~ 0.1s

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GW Instek GDM-8251, GDM-8255 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual