Declaration of Conformity
We
GOOD WILL INSTRUMENT CO., LTD.
No. 7-1, Jhongsing Rd, Tucheng City, Taipei County 236, Taiwan
GOOD WILL INSTRUMENT (SUZHOU) CO., LTD.
No.69 Lushan Road, Suzhou New District Jiangsu, China.
declares that the below mentioned product
GOM-801H
are herewith confirmed to comply with the requirements set out in the Council Directive on
the Approximation of the Law of Member States relating to Electromagneti c Compatibility
(89/336/EEC, 92/31/EEC, 93/68/EEC) and Low Voltage Equipment Directive
(73/23/EEC, 93/68/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 +A2:2001+A3:2003)
Conducted and Radiated Emission
EN 55011: 1998+A1:1999 + A2:2002
Group I class B
Current Harmonic
IEC 61000-3-2: 2000
Voltage Fluctuation
IEC 61000-3-3: 1995+A1:2001
-------------------------
-------------------------
-------------------------
-------------------------
◎ Safety
Low Voltage Equipment Directive 73/23/EEC & amended by 93/68/EEC
IEC / EN 61010-1: 2001
Electrostatic Discharge
IEC 61000-4-2: 2001
Radiated Immunity
IEC 61000-4-3: 2002+A1:2002
Electrical Fast Transients
IEC 61000-4-4: 1995+A1:2001+A2:2001
Surge Immunity
IEC 61000-4-5: 2001
Conducted Susceptibility
IEC 61000-4-6: 2001
Power Frequency Magnetic Field
IEC 61000-4-8: 2001
Voltage Dips/ Interrupts
IEC 61000-4-11: 2004
GOM-801H DC MILLI-OHM METER
USER MANUAL
CONTENTS PAGE
1. PRODUCT IN TR OD UC T ION............................................................1
2. SPECIFI CA TI ON S...............................................................................2
3. PRECAUTI O NS B E FO RE OP ER AT IO N.........................................4
3-1. UNPACKING THE INSTRUMENT..........................................................4
3-2. LINE VOLTAGE..................................................................................4
4. PANEL IN TR OD UCT I O N...................................................................5
5. CIRCUIT D ESCR IPT IO N...................................................................7
6. OPERATION INTRODUCTION .................................................9
6-1. PRELIMINARY OPERATION.................................................................9
6-2. MEASURE MENT OF RESISTOR............................................................9
6-3. MEASURE MENT OF SWITCH.............................................................10
7. MAINTENA NCE.................................................................................11
7-1. LINE FUSE REPLACEMENT................................................................11
7-2. CLEANING ........................................................................................11
i
⎯ ⎯
GOM-801H DC MILLI-OHM METER
USER MANUAL
GOM-801H 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
ii
⎯ ⎯
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
⎯ ⎯
GOM-801H 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
2
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-801H DC MILLI-OHM METER
USER MANUAL
1. PRODUCT INTRODUCTION
The Digital Milliohm Meter features with its accuracy and readability. The
circuit of this instrument has equipped with the voltage regulator and
temperature compensation in order for its accuracy not to be influenced by
the unstable AC power source and the alternation of temperature.
The Digital Milliohm Meter is specially produced for the manufacturers of
the low resistor, switch, relay, jacks, plugs, connectors sockets or the electrolytic
capacitor for the QC or IQC purpose, it also can be applied to measure the initial
contact resistance.
iv
⎯ ⎯
1
⎯ ⎯
GOM-801H DC MILLI-OHM METER
e
e
e
USER MANUAL
2. SPECIFICATIONS
The specifications are op era ted und er th e essential 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.
Meter 3 1/2 Digital Panel Meter.
Test Current 10uA, 100uA, 1mA, 10mA, 0.1A, 1A Accuracy:0.2%
Hi/Go/Lo Compar
Accuracy
Test Ranges
Accuracy
0.5%
20, 200mΩ, 2, 20, 200Ω, 2, 20kΩ totally 7 full scal
ranges.
±0.2% rdg+4 digits(±0.2% rdg+6 digits for 20mΩ rang
only)
Range Current
20, 200mΩ 1A
GOM-801H DC MILLI-OHM METER
USER MANUAL
Environment
Indoor use, altitude up to 2000m.
Operation
Environment
Ambient Temperature 0℃ to 40℃.
Relative Humidity 80% (Maximum).
Installation category II
Pollution Degree 2
Storage
Temperature
General
-10℃ to 70℃.
Power source AC 100V/120V/220V/230V±10%, 50/60Hz, 25VA
Accessories Test Lead × 1, Instruction manual × 1
Dimension 245(W)×95(H)×280(D) m/m
Weigh Approx. 2 kg
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 4
0℃.
CAUTION： The maximum input voltage on the testing
terminal is limited at +10V DC. Besides, do not input the
voltage reversely.
2Ω 0.1A
20Ω 10mA
200Ω 1mA
2kΩ 100μA
20kΩ 10μA
2
⎯ ⎯
3
⎯ ⎯
GOM-801H 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. 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
GOM-801H DC MILLI-OHM METER
USER MANUAL
4. PANEL INTRODUCTION
Fuse
GOM-801H
WARNING. To avoid personal injury, disconnect the power cord
before removing the fuse holder.
100V
120V
90-110V
108-132V
⎯ ⎯
TT0.3A
250V
4
220V
230V
198-242V
216-250V
T0.2A
250V
Figure 4-1. Front Panel
5
⎯ ⎯
GOM-801H DC MILLI-OHM METER
Front Panel
USER MANUAL
GOM-801H DC MILLI-OHM METER
USER MANUAL
5. CIRCUIT DESCRIPTION
1. Power Switch Power on/off switch.
2. Range
7 steps: 20, 200mΩ, 2, 20, 200Ω, 2 and 20kΩ.
Set the “SET/TEST” switch to “SET” position,
3. HI/LO
then select HI/LO for high or low value setting.
This button can be used for testing or HI/LO
4. SET/TEST
value setting.
5. FORCE Terminal “+” Test terminal.
6. SENSOR Terminal “+” Test terminal.
7. SENSOR Terminal “-” Test terminal.
8. FORCE Terminal “-” Test terminal.
9. HI of Comparator Set For high value setting.
10. LO of Comparator Set For low value setting.
11. Panel Meter To indicate the test value.
This indicator will be lighted up when the test
12. HI Indicator
value is higher than the setting of high value.
This indicator will be lighted up when the test
value between high and low setting. The buzzer
13. GO Indicator
will be sounded up 2~5 seconds when the GO
indicator is on.
This indicator will be lighted up when the test
14. LO Indicator
value is lower th an th e set ting of low va lue .
z DVM Circuit
The DVM is an A/D converter by u sing I C U301.
z 10 or 100 Times Signal Amplifier
The signal amplifier uses IC U401.
z Test Range selected buttons
There are 7 steps of Test ranges to be selected. It will not affect its
accuracy due to the alternation or temperature.
z Constant Current Source
The circuit uses IC U201and U202 and transistors Q203 and Q204 to
produce constant current.
z Comparator Set and HI, GO and LO Indicators
The setting is consists of the resistors and the variable resistors. The
comparator use IC U403 and U404. The HI, GO and LO indictors use
transistors Q401~Q407.
z Voltage Regulator Circuit
The power supply has regulated ou tput of ±5V and ±15V voltage, which
are regulated by using Q201, Q202 and Q301 resistors to control D201,
D202 and D301 zener diodes. The +5V voltag e regu lator circu it uses I C
U302 voltage regulator.
6
⎯ ⎯
7
⎯ ⎯
GOM-801H DC MILLI-OHM METER
VOLTAGE
REGULATOR
CONSTANT
CURRENT
SOURCE
USER MANUAL
RANGE SELECTOR
& MEASUREMENT
TEST
TERMINAL
10 OR 100
TIMES SIGNAL
AMPLIFIER
GOM-801H DC MILLI-OHM METER
USER MANUAL
6. OPERATION INTRODUCTION
6-1. Preliminary Operation
1. Set the power off.
2. Make sure that line voltage is correct for the input power voltage.
3. Plug power cord into the power outlet.
4. Turn on the instrument and allow about 10 minutes of warm up time to
stabilize the instrument.
6-2. Measurement of Resistor
SET
REFERENCE
SET
TEST
COMPARATOR
1
3
Fig. 5-1
8
⎯ ⎯
/2 DVM
HI.GO.LO
INDICATOR
Fig. 6-1
1. Connect an unknown resistor to the test terminals as shown in Fig. 6-1.
2. Set the range to the position where the reading value can be obtain ed.
9
⎯ ⎯
GOM-801H DC MILLI-OHM METER
USER MANUAL
GOM-801H DC MILLI-OHM METER
USER MANUAL
6-3. Measurement of Switch
Fig. 6-2
1. Connect the switch to be tested as shown in Fig. 6-2.
2. Set the range to the position where the reading value can be obtain ed.
7. MAINTENANCE
Qualified personnel execute the following instructions only. To avoid
electrical shock, do not perform any servicing other than the oper ating
instructions unless you are qualified to do so.
7-1. Line fuse replacement
If the fuse blows, the meter would not work. Try to determine and correct
the cause of the blown fuse, then repla ce the fus e with correc t rating and
type shown as below:
FUSE RATING AND TYPE
100/120V TT0.3A
220/230V T0.2A
WARNING: For continued fire protection, replace only
with 250V fuse of the specified type and rating, and
disconnect the power cord before proceeding fuse
replacement.
7-2. Cleaning
To keep the instrument clean, wipe the case with a damp cloth and
detergent. Do not use abrasives or solvents.
10
⎯ ⎯
11
⎯ ⎯
Loading...