Mastech MS2302 Instruction Manual
MS2302
Digital Earth Resistance Tester
OPERATING INSTRUCTION
PRECISION MASTECH ENTERPRISES CO.
Unit 8, 21/FL, Yen Sheng Center, 64 Hoi Yuen Road, Kwun Tong, Kowloon, Hong Kong.
Tel: 852 - 23430007 Fax:852 - 23436217 E-mail: info@p-mastech.com
SHENZHEN HUAYI MASTECH CO., LTD.
East Wing, 8/F., Block 4, Saige Science and Technology Industrial Garden, Hua Qiang Bei Rd.
Shenzhen, China
Tel: 0755 - 83769588 Fax: 0755 - 83768150 E-mail: info@mastech.cn
DONGGUAN HUAYI MASTECH CO., LTD.
Yuliangwei Industrial Area, Qingxi Town, Dongguan, China
Tel: 0769 -87318225 Fax: 0769 – 87318228
Users’Guide for Earth Ground Resistance Tester
Contents
Contents
1. Safety………………………........................................................................................................…….1
2. Description.……………………...............................................................................................……....4
2.1 Meter Description…………………….......................................................................................……....4
2.2 Display
…………………….....................................................................................................……....8
3. Specifications ……………………...........................................................................................……..10
3.1 Range and Precision
…………...................................................................................………………..10
3.2 Measurement Method
…………….................................................................................……………..10
3.3 Using Temperature and Humidity
…………………….................................................................……..10
3.4 Storing Temperature and Humidity
………………...............................................................…………..10
3.5 Battery……………....................................................................................................……………..11
3.6 Volume
………………...................................................................................................……...........11
3.7 Weight
…………….....................................................................................................………..........11
Users’Guide for Earth Ground Resistance Tester
Contents
3.8 Accessories
…………….................................................................................................…………..……11
4. Operation Instructions……………............................................................................………….……12
4.1 Testing the Earth Voltage
…………….............................................................................………….……12
4.2 Testing the Earth Resistance by the bi-electrode method………………...................................……….……12
4.3 Testing the Earth Resistance by the tri-electrode method
………………...................................……………15
4.4 Data Storage
………..............................................................................................……………………17
4.5 Data Reading
………….......................................……….......................................................…………18
4.6 REL Measurement….
…………………......................................................................................…….…18
4.7 MAX/MIN/AVG Measurement
……………....................................................................………...…..….19
4.8 Data Deletion
………………............................................................................................….…...….….19
4.9 Back Light………………................................................................................................………….….19
4.10 Auto Off
……………………....................................................................................................….…….19
5. Battery Replacement………………...............................................................................………….….20
Users’Guide for Earth Ground Resistance Tester
Safety
1. Safety
The earth resistance tester (hereinafter referred to as meter) , which is up to GB4793.1, the requirement on the safety
of electronic measurement instruments, is designed and manufactured in accordance with EN 61010-1, EN61010-2-030
Safety Standard, regarded as Grade 2 pollution, and the maximum voltage for the meter to probe can not exceed CAT
300V.
The users’ manual includes cautions and safety regulations, which specifies the rules in usage of the meter to avoid
personal injury accident and long keep the meter in good condition, therefore, please read the manual before using the
meter and adhere to the operation instructions inside it, and inobservance of the manual in using the meter may cause
personal injury or damage to the meter. Protection impairment if used in a manner not specified by the manufacturer.
Safety Symbols
Danger: improper operation will cause severe or fatal injuries.
Warning: improper operation may cause severe or fatal injuries
Caution：improper operation may cause personal injuries or damage to the meter
: Equipment protected throughout by double insulation or reinforced insulation
CAT III (measurement category III): Applicable to test and measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.
-1-
Users’Guide for Earth Ground Resistance Tester
Safety
Danger
Check if the rotating switch is set to a proper position before measurement
Never use the meter in the vicinity of explosive gases, steam or dust.
Never connect wires or probes with wet hands or when the surface of the meter is humid.
Don’t touch the testing wires or probes in a measurement.
Don’t open the battery cover when the meter is working.
Warni ng
Never proceed a measurement under abnormalities, for example, the housing of the meter has been
damaged so that the metal of the meter or wires are naked.
Never replace the parts of the meter by yourself or modify it. Should the meter be damaged, return it to
the local dealers for examination or repair.
Don’t replace the batteries when the surface of the meter is humid.
Be sure to set the switch to “OFF” and disconnect the testing wires before replacing the batteries.
-2-
Users’Guide for Earth Ground Resistance Tester
Safety
Caution
Check if the total length of testing wires is inserted into the port before a measurement.
Take out of the batteries from the cartridge if the meter will not be used or will be stored for long.
Don’t expose the meter to sunlight, high temperature, humidity or dew
Clean the meter with neutral solvents or wet cloth instead of abrasives or organic solvents
Lay the meter in store only when it is dry.
Caution:
Using this appliance in an environment with a strong radiated radio-frequency electromagnetic field
(approximately 3V/m ),may influence its measuring accuracy. The measuring result can be strongly
deviating from the actual value.
-3-
Users’Guide for Earth Ground Resistance Tester
Description
2. Description
The meter is applicable to the testing of the earth resistance of the power supply wires, distribution wires inside a
room, electrical equipment or appliance, which can done in two measurement modes: Bi-poles or Tri-poles, and it also
can be used to measure the earth voltage.
Large digital LCD and backlights applied to the meter facilitate users to read the information on LCD. Besides, the
meter is capable of storing up to 100 groups of measurement data, which will not be lost even in case of power cuts so
that the user can easily consult the historical data. In addition, the meter can also be used to measure maximum,
minimum or average and measure relatively. Auto power-off function has been provided for it.
2.1 Meter Description
（1）Rotating Switch
It is used to selection between the measurement of earth voltage, measurement of resistance in Bi-pole method or
measurement of resistance in Tri-pole method.
（2）Key of ASP
It is used to start or cease auto power-off function.
（3）Key of LIGHT
It is used to turn on or turn off the backlight.
（4）Key of CLEAR
It is used to clear away data.
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