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1. LCD 2. H interface：current pole
3. S interface：voltage pole 4. E interface：
5. E interface: grounding electrode 6. Function button
7. DC charging 8. USB interface 9. Test button
10. Safety Alligator Clip 11.Test line 12. Grounding rob
13. Easy test line 14.Simple test line short connector
VI．Measuring Principle
1．Ground voltage measurement using average rectification。
2．The grounding resistance value is measured using the rated current change
method, that is, the AC rated current I flows between the ground electrode
of the measuring object E and the H current electrode to obtain the potential
difference V between the E ground electrode and the S voltage electrode, and
calculate the grounding resistance R according to the formula R=V/I.In order
to ensure the accuracy of the test, a four-wire method was designed to increase
the ES auxiliary ground. During the actual test, ES and E were clamped at
the same point of the grounding body.The four-wire test can eliminate the
influence of the contact resistance (usually dirt or rust) on the measured
grounding body, auxiliary grounding rod, test clip, and the input interface
of the instrument to the measurement, and can eliminate the influence of the
wire resistance on the measurement, more precise.
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