GW Instek GOM-802 User Manual

Declaration of Conformity

GOM-802 DC MILLI-OHM METER

USER MANUAL

GOOD WILL INSTRUMENT CO., LTD.

No. 95-11, Pao-Chung Rd., Hsin-Tien City, Taipei Hsien, Taiwan

GOOD WILL INSTRUMENT (SUZHOU) CO., LTD.

No.69 Lushan Road, Suzhou New District Jiangsu , China .

declare that the below mentioned product

GOM-802

is herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (89/336/EEC, 92/31/EEC, 93/68/EEC) and Low Voltage Equipment Directive (73/23/EEC). For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Equipment Directive, the following standards were applied:

◎ EMC

EN 61326-1: Electrical equipment for measurement, control and laboratory use –– EMC

requirements (1997+A1: 1998)

Conducted and Radiated Emission EN 55011: 1998 class B

Current Harmonic IEC 61000-3-2: 2000 Voltage Fluctuation IEC 61000-3-3: 1995

-------------------------

Electrostatic Discharge IEC 61000-4-2: 1995+A1: 1998 Radiated Immunity IEC 61000-4-3: 1996+A1: 1998 Electrical Fast Transients IEC 61000-4-4: 1995 Surge Immunity IEC 61000-4-5: 1995 Conducted Susceptibility IEC 61000-4-6: 1996 Power Frequency Magnetic Field IEC 61000-4-8: 1993 Voltage Dips/ Interrupts IEC 61000-4-11: 1994

◎ Safety

Low Voltage Equipment Directive 73/23/EEC & amended by 93/68/EEC

IEC / EN 61010-1: 2001

CONTENTS PAGE

1. PRODUCT INTRODUCTION............................ ........ ...........… …

1-1. Description………………………………………………………….. 1-2. Key Feature……………………………………………..…………..

2. SPECIFICATIONS………………...…………………………… 4

3. PRECAUTIONS BEFORE OPERATION…….………….…...

3-1. Unpacking the Instrument...…………….………….……………....

3-2. Checking the Line Voltage………………..………………………...

4. PANEL INTRODUCTION……………………..………….…...

4-1. Front Panel……………………………………………………….… 4-2. Rear Panel……………………………………….…………………..

5. OPERATION INTRODUCTION...……………………...……..

5-1. The [SHIFT] key and function keys………………..….…………... 5-2. Warm up…………………..……………………………………….. 5-3. Over-range indicator…..…………………………………………… 5-4. TRIG standby indication…………………………………………... 5-5. Input overload protection.….…………………………..………….. 5-6. Interface Operation…….………………………………………….. 5-7. Installation and Operation………………………………………….

6. MEASUREMENT INSTRUCTION……………………………

6-1. Resistance measurement…………………………………………… 6-2. Temperature measurement………………………………………... 6-3. Temperature Compensation Measurement……………………….. 6-4. General Function……………………………………………………

7. MEASUREMENT TECHNIQUES…………….………………

7-1. 4-wire measurement……………………………………………….. 7-2. Temperature measurement………………………………………...

8. MAINTENANCE………………………………………….…….

8-1. Line fuse replacement……………………………….……………... 8-2. Line voltage conversion…..…………………………..……………. 8-3. Cleaning……………………………………………………………..

10 10

11 11 11 11 11 12 12

13 17 18 19

26 28

31 31 32

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GOM-802 DC MILLI-OHM METER

USER MANUAL

GOM-802 DC MILLI-OHM METER

USER MANUAL

SAFETY TERMS AND SYMBOLS

These terms may appear in this manual or on the product:

WARNING. Warning statements identify condition or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

WARNING: This equipment is not for measurements performed for CAT II, III and IV.

The following symbols may appear in this manual or on the product:

FOR UNITED KINGDOM ONLY

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

WARNING: THIS APPLIANCE MUST BE EARTHED

IMPORTANT: The wires in this lead are colored in accordance with

the following code:

Green/ Yellow: Earth Blue: Neutral Brown: Live (Phase)

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

The wire which is colored Green & Yellow must be connected to the

Earth terminal marked with the letter E or by the earth symbol

DANGER ATTENTION Protective Earth(ground) High Voltage refer to Manual Conductor Terminal

Terminal

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or colored Green or Green & Yellow. The wire which is colored Blue must be connected to the terminal

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

marked with the letter L or P or colored Brown or Red. If in doubt, consult the instructions provided with the equipment or

contact the supplier.

iii

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GOM-802 DC MILLI-OHM METER

USER MANUAL

GOM-802 DC MILLI-OHM METER

USER MANUAL

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

0.75mm

should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.

Any mounded 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.

1. PRODUCT INTRODUCTION

1-1. Description

GOM-802 is a high precision programmable DC Milli-ohm meter suitable for the low resistance measurements of switches, relays, connectors, PCB tracks and variety of other devices. With the easy-to-use features, superior performance, and automatic test interfaces described as below, GOM-802 is obviously a reliable and handy instrument for the low resistance measurements.

Easy-to-use features:

Utilizing the arrow key for setting the percentage of upper and lower limit based on the normal value can make it easier to execute the HI-LO-GO comparator function. Besides, through the Alarm Buzzer setting can indicate the PASS/FAIL status, and all kinds of output status can be indicated through Handler Interface output. The RELATIVE feature that enables GOM-802 to remove the stray resistance easily, and the 20 sets of Normal/Hi/Lo setting memories can satisfy with different kind of test condition. Also, the last setting will be recalled every time when the GOM-802 is turned on.

Superior Performance:

There are nine measurement ranges from 30mΩ to 3MΩ selected automatically or manually with the constant current between 1μA and 1A, 0.05% high accuracy, 1μΩ resolution and four terminals Kelvin connection to make a reliable and consistent test result. The flexible choice for a high measurement accuracy at speed of 7 sampling/sec (full scale at 30000) or a less measurement accuracy at speed of 30 sampling/sec (full scale at 3000) can match with the speed requirement of test.

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GOM-802 DC MILLI-OHM METER

USER MANUAL

GOM-802 DC MILLI-OHM METER

USER MANUAL

Temperature Compensation (Option):

The optional temperature probe PT-100 can control the measuring resistance to meet the required temperature. When the temperature coefficient and required temperature is keyed in under TC mode, GOM-802 will display the measuring resistance corresponding to the required temperature.

Automatic Test:

For automatic system applications, the GOM-802 provides a handler interface that can indicate the output status on PASS, FAIL, HI, LO, READY, or EOT, and control signal of measurement trigger. An optional RS-232 GPIB is also available for the computer control application.

Application:

z Production testing for contact resistance of switches, relays, connectors,

cables and printed circuit boards and other low resistance devices.

z Component testing of resistors, motors, fuses, heating elements. z Incoming inspection and quality assurance testing. z Conductivity evaluation for product design.

1-2. Key Feature:

z Four-wire measurement method. z Auto-recall last setting on re-power on. z Diode test. z Alarm setting for PASS/FAIL test result. z Sampling rate: 7 or 30 sampling/sec. z Standard interface: Scan, Handler, optional interface: RS-232 GPIB.

z 30,000 counts. z Measurement Range:

30mΩ~3MΩ.

z 0.05 high accuracy. z Hi/Lo comparator and limit percentage setting with 20 memory sets. z Measurement of REL, Actual and % value. z Manual or Auto-ranging. z Continuous or Trigger measurement mode. z Temperature compensation and measurement.

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GOM-802 DC MILLI-OHM METER

USER MANUAL

GOM-802 DC MILLI-OHM METER

USER MANUAL

2. SPECIFICATIONS

The specifications are operated under the essen tial conditions as follows:

z A 1-year calibration cycle. z An operating temperature of 18 to 28℃ (64.4 to 82.4℉). z Relative humidity not exceeding 80%. z Accuracy is expressed as ±(percentage of reading + digits). z The instrument requires 30 minutes warm-up time to achieve rated

accuracy.

1. Resistance Measurement

30000 counts (speed : 7 times/second)

Range Resolution

Measuring

Current

Accuracy

30m 1μ 1A approx. 0.1%+6*

300m 10μ 100mA 0.05%+6*

3 100μ 100mA 0.05%+3

30 1m 10mA 0.05%+2

300 10m 1mA 0.05%+2

3k 100m 100μA0.05%+2

30k 1 100μA0.05%+2

300k 10 10μA0.05%+2

3Meg 100 1μA0.05%+2

3000 counts Accuracy (speed: 30 times/second) *When the instrument is set to 30mΩ or 300mΩ range, the resistance value will

be changed while connecting or disconnecting the test lead to the panel due to the different temperature between internal and external of the instrument. Therefore, it must wait 1 minute in order to obtain an accurate value after the test lead is connected or disconnected.

* When use Kelvin clip to resume testing after long time ending, it needs more

time to wait for a stable value.

** In high speed mode, first assure that the instrument has been grounded throug

power cord.

±5 counts **

Open-terminal

Voltage

4.8V

Measurement Four-terminal method. Auto-ranging Provided. Over input range“OL” indication

Maximum Applied voltage Comparator 20 sets of comparator status can be selected.

Buzzer mode switchable NON, PASS, FAIL

2.Temperature Measurement

Temperature sensor (option)

Range

-9.9℃ ~ 39.9℃ 0.3%+0.5℃ 0.3%+2℃

-50.0℃ ~ -10.0℃ 40℃ ~ 100℃

3. Temperature Correction Function

Temperature correction range 0.0℃~40.0℃ Reference temperature range 0℃~99.9℃ Thermal coefficient range ±9999 ppm

Temperature range 0℃~39.9℃ 0.3%+resistance measurement accuracy.

40℃~100℃ 0.6%+resistance measurement accuracy. * The temperature coefficiency for the other setting must be calculated individually

according to different conditions.

* If the temperature coefficiency or the difference between the environmental

temperature and the require temperature exceeds normal operation, after compensation calculation, the variation of the reading value will be tremendous.

30m~3Ω range: 30VpDC Other range: 100VpDC

Platinum resistor. Lead length: 1.5m approx.

Accuracy

Speed: 7 times/second

0.3%+1.0℃ 0.3%+3℃

Accuracy of temperature compensation for 3930 ppm/Cu wire, speed: 7 times/second.*

Accuracy

Speed: 30 times/second

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GOM-802 DC MILLI-OHM METER

USER MANUAL

GOM-802 DC MILLI-OHM METER

USER MANUAL

4. Interface

Signal: START TTL input Signal: LOW, HIGH, FAIL, PASS, EOT, READY

Handler interface

Scanner

RS-232 GPIB (option) IEEE488.1-1987, IEEE488.2-1992 and SCPI-1994

5. ENVIRONMENTAL

Operation Environment

Storage temperature

6. GENERAL

Power source

Accessories

Dimension 251(W)×91(H)×291(D) m/m Weigh

total 6 TTL outputs. (This function is valid only under the resistance measurement mode and the compare mode is enabled.) Signal: READY, PASS, LOW, HIGH, CLOCK,

STRB total 6 TTL outputs. (This function is valid only under the resistance measurement mode and the compare mode is enabled.)

Indoor use, altitude up to 2000m. Ambient Temperature 0℃ to 40℃. Relative Humidity 80% (Maximum). Installation category II Pollution Degree 2

-10℃ to 70℃.

AC 100V/120V/220V/230V±10%, 50/60Hz, 27VA, 22W. Test Lead × 1, Instruction manual × 1, Programmable manual × 1 (option), Temperature sensor (option) × 1

Approx. 3 kg

3. PRECAUTIONS BEFORE OPERATION

3-1.Unpacking the Instrument

The product has been fully inspected and tested before shipping from the factory. Upon receiving the instrument, please unpack and inspect it to check if there is any damage caused during transportation. If any sign of damage is found, notify the bearer and/or the dealer immediately.

3-2.Checking the Line Voltage

The product can be applied by any ki nd of line vo ltage s sho wn in the table b elo w. Before connecting the power plug to an AC line outlet, make sure the voltage selector of the rear panel is set to the correct position corresponding to the line voltage. It might be damaged the instrument by connecting to the wrong AC line voltage.

WARNING. To avoid electrical shock the power cord protective grounding conductor must be connected to ground.

AVERISS: Pour éviter les chocs électriques, le fil de terre du cordon secteur doit impérativement être relié à la terre.

When line voltages are changed, replace the required fuses shown as below:

Model

Line

voltage

Range Fuse

Line

voltage

Range Fuse

WARNING： To avoid electrical shock, the power cord protective grounding conductor must b e connect ed to grou nd.

CAUTION：To avoid damaging th e instrument , do not use it in a place where ambient temperature exceeds 4

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0℃.

GOM-802

100V 120V

WARNING. To avoid personal injury, disconnect the power cord

before removing the fuse holder.

90-110V

108-132V

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TT0.3A

250V

220V 230V

198-242V 216-250V

T0.25A

250V

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