In order to maintain the safe operation of the circuit,Earth Resistance Tester it is inevitable to measure the grounding resistance. The measurement method of the modern grounding resistance measuring instrument breaks through the tradition. When measuring a grounding system with a loop,Earth Resistance Tester there is no need to disconnect the ground lead and no auxiliary electrodes, which is safe,Earth Resistance Tester fast and easy to use.

When measuring a single point of grounding with a grounding resistance measuring instrument,Earth Resistance Tester it is aimed at an individual single point, and its grounding resistance value cannot generally be measured directly through the appearance. All are measured through auxiliary equipment (after auxiliary points,Earth Resistance Tester the auxiliary line forms one or more loops). Clamp-type grounding resistance meters generally test the single-point grounding resistance through the two-point method and the three-point method. The simple two-point transmission is to find another auxiliary point in the vicinity of a single point,Earth Resistance Tester such as: a natural grounding structure such as a grounded water pipe,Earth Resistance Tester construction object or fire hydrant. Then connect the two points through the test line. What is measured with the clamp meter is the series resistance of the bright spots. This method cannot directly detect the single-point resistance value,Earth Resistance Tester but if the detected value is less than the engineering requirements, the single-point grounding body is qualified.

Separately connect the two grounding points,Earth Resistance Tester and use a grounding resistance measuring instrument to detect the series value. R①, R②, R③ are the measured series data,Earth Resistance Tester so that the unique grounding resistance value of each point can be calculated. After R①=R1+R2R②= R2+R3R③=R3+RA1 can get: R1=(R①+R③-R②)÷2. For testing,Earth Resistance Tester the test line group can be subtracted during testing.