V．Structure
1. LCD 2. H interface：current pole
3. S interface ： voltage pole 4. E interface ： grounding pole
5. Function button 6. DC charging 7. USB interface
8. Test button 9. Safety Alligator Clip 10.Test line
11. Grounding rob 12. Easy test line
13.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 rated current I (30mA Max, 128Hz) flowing between the
measuring object E (ground electrode) and H (current electrode); seeking E
and S (voltage electrode) Potential difference V, then the method to determine
the ground resistance Rx。
Rx=V/I
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