The digital grounding resistance tester is a commonly used engineering measurement instrument, widely used in electrical equipment and precise measurement of grounding resistance of power lines in industries such as power, lightning protection, communication, and transportation. It is an indispensable tool for electrical equipment safety inspection and grounding engineering completion acceptance.

1. Operating Conditions 2. Measuring range and the constant value (RMS) 3. Measurement accuracy and resolution 4. Errors caused by auxiliary earth resistance and ground voltage measurement 5. Power 6. Size and weight

1. The structure of high strength aluminum alloy case, the circuit to prevent the frequency, radio frequency interference detection method using phase-locked loop tracking and accompanied by synchronous switched capacitor filter, the instrument has good anti-jamming capability.
2. Use of DC / AC technology will transform the low-frequency constant DC current into AC for the measurement.
3. Allow auxiliary grounding resistance in the 0 ~ 2KΩ (RC), 0 ~ 40KΩ (RP) between the change not affect measurement results.
4. No manual adjustment of the instrument balance, 3 (1 / 2)-bit LCD display, in addition to resistance measurement, it can also measure low resistance conductor resistance, soil resistivity and the AC ground voltage.
5. Should the test loop unreasonable header displays "1" overflow, consistent with conventional measurement practices.

The tester abandons the traditional way of making power by artificial, uses  advanced large scale integrated circuits,applies DC / AC transformation technology ,makes three side buttons, four-terminal measurement button to combine into a model of the new grounding resistance measuring instrument.
The principle of the tester is to make DC into AC low-frequency constant current by the DC / AC converter inside, through the auxiliary grounding electrode C and E composition of the measured object circuit to generate AC voltage drop measured object, sent by the auxiliary grounding electrode P AC amplifier and then displayed through the detector head into the table. With magnification switch, available in three different capacity limits: 0 ~ 2Ω, 0 ~ 20Ω, 0 ~ 200Ω.