DIGITAL MILLI OHM METER 3.

3. Input terminal for the black test lead Ambient environment to ensure accuracy: temperature
OPERATION MANUAL 4. Input terminal for the red test lead (23±5)℃, relative humidity <75%
Contents 5. Zero knob: used to calibrate the zero readings in mΩ range Calibration date: 1 year from off-factory date
1. General……………………………………..1 6. “*” key: LCD backlight ON/OFF key Range Accuracy Resolution Testing current
20 mΩ ±（0.5%rdg±3） 0.01 mΩ Approx.100mA
2. Panel Description…………………………1 7. “HOLD” key: press to hold the current readings on the LCD. 200 mΩ 0.1 mΩ
3. Technical Specifications...………………1 The LCD will display “HOLD” symbol. Press again to 2Ω 1 mΩ
4. Operation Instruction………………….…1 cancel the data hold function. 20Ω ±（0.5%rdg±3） 1 0mΩ Approx.50mA
200Ω 1 00mΩ
5. Measuring Insulated Resistance…….…2 8. Power indicator (LED) 2kΩ 1Ω
6. Safety Instructions…………………….….2 9. Terminal of DC 9V AC adapter ( ). It is used to
7. Packing List……………………………......2 connect to external power source for power supply. 4. Operation Instructions
8. Trouble Shooting…………………….……3 10. Shoulder strap locker: used to lock the shoulder strap so 1) For the first time of operation, please make sure there is
that the instrument can be hung on the neck to save enough power source. If not, open the battery door and put
1. General hands. into 6 pcs of 5# batteries (Refer to battery replacement on
Adopting a highly precise constant current source, this page 3). Note the batter polarities.
milli-ohm meter can make 4-wire resistance measurement via 3. Technical Specifications 2) When connecting to an external AC adapter, the battery
accurate digital bridge. It can meansure milli resistance over 1. General Specifications power supply will be shut off. Do not charge the batteries.
0.01mΩ, different conductors, heating components, soldered 1) Display: 3 1/2 LCD display, max.display 1999 NOTE: choose a correct power supply mode ( ).
point resistance, ect.. With digital bridge, the instrument has the 2) Over range indication: displays “1” when exceeding upper 3) To ensure measurement accuracy, warm up the instrument
features of easy to operate, wide test range, highly stable limit for at least 10 seconds before operation.
performance, backlit LCD display, data hold and auto power off. 3) Zero calibration: calibrated to zero by external tools 4) Before measurement, make sure the 4-wire test leads are
Using a shoulder strap, it can be used by both hands. It is an 4) Samplign rate: approx.3 times/Sec. safe and sound. Do not use broken test leads.
ideal instrument to be used for contact resistance 5) Lower battery indication: the LCD display “ ” symbol. 5) To check the instrument is working properly, test a resistor of
measurements of power resistor, motor coils, transformers, 6) Additional temperature coeffciency: 0.15 x speficified known resistance before other measurements.
PCB boards, cables, antenna, communication equipments, accuracy/℃ (<18℃ or >28℃) 6) To avoid damage to instrument circuit, do not input voltage to
electric machines, electrical facilities, etc. 7) Altitude: <2000m the 4-wire test lead socket.
8) Operation environment: in-door use; pollution category II;
2. Panel Descriptions temperature -15℃-55℃, relative humidity <75%RH Principles:
9) Storage environment: temperature -40℃-60℃, relative 1) Refer to the following illustrations. There is a testing current
humidity <90%RH going through the range from “I+” to “I－”
10) Power source: 5# battery LR6 (1.5V) x6 (or external AC 2) This current is going through a resistor Rx (resistance value
CAT.Ⅲ 50V

adapter). With lower battery indication. not know)

11) Power consumption: <120mA 3) The voltage Vx can be measured on terminal Rx1/Rx2:
12) Fuse: 150mA/60V resettable fuse Vx=Rx x Is, hence Rx=Vx/Is
13) Dimension: 175 (L) x 116 (W) x 62.5 (D) mm 4) The unknown resistance value can be calculated via Vx
1. Power switch/function switch: power ON/OFF the 14) Weight: 580g (including battery) value, and will be displayed on the LCD.
instrument and selects functions. To save power, turn the 5) To have an accurate resistance value, please make zero
switch to “OFF” when not in use. 2. Techical specifications calibration before measurement.
2. LCD display: displays testing results and unit symbols Accuracy:±(a% rdg＋ least effective digit)

1
Accurate impedace measurement: Data Hold: symbol “ ”, replace battery according to the following
1) Input the two connectors of the red test lead into the two red Press the “HOLD” button, the current data will be held on steps:
connectors of the instrument on the right side, and the two the LCD. Press the “HOLD” button again to cancel data hold. 1) Use a screw driver to open the battery door screws,
connectors of the black test lead to the two black NOTE: There is no data hold function during insulation and take off the battery door.
connectors of the instruemnt on the left side. resistance measurement. 2) Take off the battery and replace with a new one. To
2) Tune the switch the a suitable range. ensure long time battery power supply, it is
3) Clamp the two test clips on the 0 ohm circuit terminals, and Backlit Display:
Pressing “*” button, the LCD backlight turns on. Pressing “*” recommended to use alkaline batteries.
adjust the zero knob to make the reading as 0. button again, the LCD backlight turns off. 3) Load the battery door and tighten the screws.
4) Once a new range is selected, always do the zero calibration
before measurement.
5) To measure an unknown resistor Rx, follow the following Safety Instructions and Maintenance
The tester is a precise instrument. User is not allowed to
method as illustrated below: apply any modification to the instrument circuit.

CAUTION!
1. To ensure safety, the tested object must be completely
shut off from power supply and must be testified that the
tested object has been fully discharged by short circuit Fuse replacement
discharge to testify that the tested object dose have any The instrument uses a 150mA/60V resettable fuse. In case
6) To measure a resistor on a PCB, ollow the following method
electrical hazard. of replacement, please use a fuse of same specification. And
as illustrated below:
2. Do not apply voltage measurement to the input terminals. follow instructions as below:
3. Do not apply any measurement before the instrument’s 1) Tune the function switch to “OFF”position.
batteries are well installed or before the rear cover is 2) Use a screw driver to open the screws on the bottom, and
well loaded. take off the bottom cover.
4. Before change battery or change fuse, remove all test 3) Take off the PCB screws, and take off the PCB.
leads from the tested object and turn off the power 4) Locate the resettable fuse on the PCB, which is marked with
switch. “FUSE”. Use an iron to take off the fuse and replace it with a
5. Keep the instrument away from water and dust. Do not new one of same spec.
7) The tested result will be displayed on the LCD.
fall or throw the instrument. 5) Re-load the PCB, bottom cover and screws.
CAUTION! 6. Keep the instrument away from high temperature, high
1. If the tested resistance is over 2kΩ or there is open circuit, humidity, flammable, explosive and strong magnetic CAUTION!
environment. The instrument uses a resettable fuse, which will protect
the LCD displays “1”.
7. Use a soft cloth dampened in a solution of mild detergent the internal circuits once wrong operations occur. Once the
2. When testing a live resistor, to ensure safety, do not
and water to clean the instrument. Do not spray cleaner wrong operation is canceled, the fuse will automatically reset,
proceed testing until the tested circuit is completely
directly onto the instrument or use any abrasives or no need to change fuse.Once a fuse change is in need, use a
powered off and all capacitors are fully discharged.
strong solvent. fuse of same spec.
3. If testing results have considerable, it may be caused by
other live components of the same circuit or by electric 8. If long time no use, take out the batteries from the
instrument to avoid battery leakage damaging the Packing List
potential on the two ends of the resistor.
instrument. 1. Digital milli-ohm meter x1pcs
4. Do not input voltage to the resistance range!
9. When use 9V battery, if the LCD displays low battery 2. 4-wire test lead x1 pair
2
 3. 5# battery (1.5V) x6pcs
4. Operation manual x1pcs
5. Shoulder strap x1pcs
Trouble Shooting
If the instrument dose not work properly, the following
self-check steps will help to solve general faults. If the default
still not eliminated, please contact the maintenance or local
distributor.
Fault Solution
● Power off - please turn on
No display the power
● Replace the batteries
symbol appearance ● Replace the batteries
Error value ● Replace the batteries

The operation manual is subject to change without prior

notice.
The contents in this operation manual are considered to be
correct. If user finds any mistake or omission, please
contact the manufacturer.
The manufacturer hereby will not be responsible for any
accident or damage caused by improper operation.
The functions decribed in this manual are not meant for
any reason for any special usage.