Several measurement methods of ground resistance tester

    Single clamp ground resistance tester

　　Measure the ground resistance of each grounding point in multi-point grounding, and the ground connection cannot be disconnected to prevent danger. Applicable to: multi-point grounding, cannot be disconnected, measure the resistance of each grounding point. Wiring: Use current clamp to monitor the current on the grounding point to be tested. CA6415 uses a single clamp to measure the ground resistance tester

　　Double clamp ground resistance tester

　　Conditions: Multi-point grounding, no auxiliary ground stakes, measure single grounding. Wiring: Use the current clamp specified by the manufacturer to connect to the corresponding socket, clamp the two clamps on the grounding conductor, and the distance between the two clamps should be greater than 0.25 meters.

　　Two-wire ground resistance tester

　　Conditions: There must be a known well-grounded ground, such as PEN, etc. The measured result is the sum of the resistance of the measured ground and the known ground. If the resistance of the known ground is much smaller than the measured ground, the measured result can be used as the result of the measured ground. Applicable to: areas with dense buildings or sealed cement ground where piles cannot be driven. Wiring: E+ES is connected to the measured ground, and H+S is connected to the known ground.

　　Three-wire ground resistance tester

　　Conditions: There must be two grounding rods: an auxiliary ground and a detection electrode. The distance between each grounding electrode is not less than 20 meters. The principle is to add current between the auxiliary ground and the ground being measured.

　　Measure the voltage drop between the measured ground and the detection electrode. The measurement result includes the resistance of the cable itself. Applicable to: foundation grounding, construction site grounding and lightning protection grounding. Wiring: S is connected to the detection electrode, H is connected to the auxiliary ground, and E and ES are connected to the measured ground.

　　Four-wire ground resistance tester

　　Basically the same as the three-wire method, it can replace the three-wire method when measuring low ground resistance and eliminating the influence of the measurement cable resistance on the measurement result. When measuring, E and ES must be directly connected to the measured ground separately. This method has the highest accuracy among all ground resistance measurement methods.

　　The CA6415 clamp-type ground resistance tester is a single-jaw clamp-type ground resistance meter. The CA6415 ground resistance tester is a great supplement to traditional ground resistance measurement, providing fast measurement and complete safety.