1.1 General introduction

Supplied with the new type different frequency AC power supply, GDDW-III Power Instrument Earth Ground Resistance Test Kit adopts microprocessor to control and process signal,which solve problems of the interference between test lead wires.

It is used to test grounding resistance in different places such as substation ground network(4Ω),power station,microwave station(10Ω),lightning rod(10)and so on.