Declaration of Conformity
We
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 |
Electrostatic Discharge |
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EN 55011: 1998 class B |
IEC 61000-4-2: 1995+A1: 1998 |
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Current Harmonic |
Radiated Immunity |
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IEC 61000-3-2: 2000 |
IEC 61000-4-3: 1996+A1: 1998 |
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Voltage Fluctuation |
Electrical Fast Transients |
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IEC 61000-3-3: 1995 |
IEC 61000-4-4: 1995 |
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Surge Immunity |
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IEC 61000-4-5: 1995 |
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Conducted Susceptibility |
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IEC 61000-4-6: 1996 |
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Power Frequency Magnetic Field |
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IEC 61000-4-8: 1993 |
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Voltage Dips/ Interrupts |
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IEC 61000-4-11: 1994 |
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Safety
Low Voltage Equipment Directive 73/23/EEC & amended by 93/68/EEC
IEC / EN 61010-1: 2001
GOM-802 DC MILLI-OHM METER
USER MANUAL
CONTENTS |
PAGE |
1.PRODUCT INTRODUCTION...............................................…… 1
1-1. Description………………………………………………………….. 1
1-2. Key Feature……………………………………………..………….. 2
2.SPECIFICATIONS………………...…………………………… 4
3.PRECAUTIONS BEFORE OPERATION…….………….…... 7
3-1. Unpacking the Instrument...…………….………….…………….... 7
3-2. Checking the Line Voltage………………..………………………... 7
4.PANEL INTRODUCTION……………………..………….…... 8
4-1. Front Panel……………………………………………………….… 10
4-2. Rear Panel……………………………………….………………….. 10
5.OPERATION INTRODUCTION...……………………...…….. 11
5-1. The [SHIFT] key and function keys………………..….…………... 11 5-2. Warm up…………………..……………………………………….. 11 5-3. Over-range indicator…..…………………………………………… 11 5-4. TRIG standby indication…………………………………………... 11 5-5. Input overload protection.….…………………………..………….. 11 5-6. Interface Operation…….………………………………………….. 12 5-7. Installation and Operation…………………………………………. 12
6.MEASUREMENT INSTRUCTION…………………………… 13
6-1. Resistance measurement…………………………………………… 13
6-2. Temperature measurement………………………………………... 17
6-3. Temperature Compensation Measurement……………………….. 18
6-4. General Function…………………………………………………… 19
7.MEASUREMENT TECHNIQUES…………….……………… 26
7-1. 4-wire measurement……………………………………………….. 26
7-2. Temperature measurement………………………………………... 28
8.MAINTENANCE………………………………………….……. 31
8-1. Line fuse replacement……………………………….……………... 31
8-2. Line voltage conversion…..…………………………..……………. 31
8-3. Cleaning…………………………………………………………….. 32
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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:
DANGER |
ATTENTION |
Protective |
Earth(ground) |
High Voltage |
refer to Manual |
Conductor |
Terminal |
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Terminal |
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GOM-802 DC MILLI-OHM METER
USER MANUAL
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 
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.
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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 0.75mm2 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.
GOM-802 DC MILLI-OHM METER
USER MANUAL
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
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:
zProduction testing for contact resistance of switches, relays, connectors, cables and printed circuit boards and other low resistance devices.
zComponent testing of resistors, motors, fuses, heating elements.
zIncoming inspection and quality assurance testing.
zConductivity evaluation for product design.
1-2. Key Feature:
z30,000 counts.
zMeasurement Range: 30mΩ~3MΩ.
z0.05 high accuracy.
zHi/Lo comparator and limit percentage setting with 20 memory sets.
zMeasurement of REL, Actual and % value.
zManual or Auto-ranging.
zContinuous or Trigger measurement mode.
zTemperature compensation and measurement.
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GOM-802 DC MILLI-OHM METER
USER MANUAL
zFour-wire measurement method.
zAuto-recall last setting on re-power on.
zDiode test.
zAlarm setting for PASS/FAIL test result.
zSampling rate: 7 or 30 sampling/sec.
zStandard interface: Scan, Handler, optional interface: RS-232 GPIB.
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GOM-802 DC MILLI-OHM METER
USER MANUAL
2. SPECIFICATIONS
The specifications are operated under the essential conditions as follows:
zA 1-year calibration cycle.
zAn operating temperature of 18 to 28 (64.4 to 82.4 ).
zRelative humidity not exceeding 80%.
zAccuracy is expressed as ±(percentage of reading + digits).
zThe instrument requires 30 minutes warm-up time to achieve rated accuracy.
1. Resistance Measurement |
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30000 counts (speed : 7 times/second) |
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Range |
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Resolution |
Measuring |
Accuracy |
Open-terminal |
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Current |
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Voltage |
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30m |
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1μ |
1A approx. |
0.1%+6* |
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300m |
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10μ |
100mA |
0.05%+6* |
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3 |
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100μ |
100mA |
0.05%+3 |
3V |
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30 |
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1m |
10mA |
0.05%+2 |
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300 |
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10m |
1mA |
0.05%+2 |
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3k |
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100m |
100μA |
0.05%+2 |
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30k |
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1 |
100μA |
0.05%+2 |
4.8V |
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300k |
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10 |
10μA |
0.05%+2 |
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3Meg |
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100 |
1μA |
0.05%+2 |
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3000 counts Accuracy |
±5 counts ** |
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(speed: 30 times/second) |
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*When the instrument is set to 30mΩ or 300mΩ range, the resistance value will |
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be changed while connecting or disconnecting the test lead to the panel due to the |
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different temperature between internal and external of the instrument. Therefore, |
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it must wait 1 minute in order to obtain an accurate value after the test lead is |
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connected or disconnected. |
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* When use Kelvin clip to resume testing after long time ending, it needs more |
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time to wait for a stable value. |
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** In high speed mode, first assure that the instrument has been grounded through |
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power cord. |
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GOM-802 DC MILLI-OHM METER
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USER MANUAL |
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Measurement |
Four-terminal method. |
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Auto-ranging |
Provided. |
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Over input range |
“OL” indication |
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Maximum Applied voltage |
30m~3Ω range: 30VpDC |
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Other range: 100VpDC |
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Comparator |
20 sets of comparator status can be selected. |
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Buzzer mode switchable |
NON, PASS, FAIL |
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2.Temperature Measurement |
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Temperature sensor (option) |
Platinum resistor. |
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Lead length: 1.5m approx. |
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Range |
Accuracy |
Accuracy |
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Speed: 7 times/second |
Speed: 30 times/second |
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-9.9 ~ 39.9 |
0.3%+0.5 |
0.3%+2 |
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-50.0 ~ -10.0 |
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0.3%+1.0 |
0.3%+3 |
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40 ~ 100 |
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3. Temperature Correction Function |
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Temperature correction range |
0.0 ~40.0 |
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Reference temperature range |
0 ~99.9 |
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Thermal coefficient range |
±9999 ppm |
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Temperature range |
Accuracy of temperature compensation for |
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3930 ppm/Cu wire, speed: 7 times/second.* |
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0 ~39.9 |
0.3%+resistance measurement accuracy. |
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40 ~100 |
0.6%+resistance measurement accuracy. |
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*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.
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GOM-802 DC MILLI-OHM METER
USER MANUAL
4. Interface
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Signal: START TTL input |
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Signal: LOW, HIGH, FAIL, PASS, EOT, READY |
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Handler interface |
total 6 TTL outputs. |
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(This function is valid only under the resistance |
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measurement mode and the compare mode is |
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enabled.) |
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Signal: READY, PASS, LOW, HIGH, CLOCK, |
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STRB total 6 TTL outputs. |
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Scanner |
(This function is valid only under the resistance |
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measurement mode and the compare mode is |
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enabled.) |
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RS-232 GPIB (option) |
IEEE488.1-1987, IEEE488.2-1992 and SCPI-1994 |
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5. ENVIRONMENTAL |
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Indoor use, altitude up to 2000m. |
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Operation |
Ambient Temperature 0 to 40 . |
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Relative Humidity 80% (Maximum). |
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Environment |
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Installation category |
II |
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Pollution Degree |
2 |
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Storage temperature |
-10 to 70 . |
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6. GENERAL |
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Power source |
AC 100V/120V/220V/230V±10%, 50/60Hz, 27VA, |
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22W. |
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Accessories |
Test Lead × 1, Instruction manual × 1, |
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Programmable manual × 1 (option), |
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Temperature sensor (option) × 1 |
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Dimension |
251(W)×91(H)×291(D) m/m |
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Weigh |
Approx. 3 kg |
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WARNING To avoid electrical shock, the power cord protective grounding conductor must be connected to ground.
CAUTION To avoid damaging the instrument, do not use it in a place where ambient temperature exceeds 40 .
GOM-802 DC MILLI-OHM METER
USER MANUAL
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 kind of line voltages shown in the table below. 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 |
Range |
Fuse |
Line |
Range |
Fuse |
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voltage |
voltage |
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GOM-802 |
100V |
90-110V |
TT0.3A |
220V |
198-242V |
T0.25A |
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120V |
108-132V |
250V |
230V |
216-250V |
250V |
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WARNING. To avoid personal injury, disconnect the power cord before removing the fuse holder.
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