https://www.mktester.com/ground-resistance-tester/digital-ground-resistance-tester.htmlOverview： Digital Ground Resistance Tester Rejects the traditional manual manual power generation method adopts advanced media and large scale integrated circuits, and uses DC / AC conversion techniques to combine the triple buttons and four-end button measurement modes with new ground resistors. . The working principle is that the DC / AC converter in the machine changes the DC constant current, and the circuit is formed by the auxiliary ground electrode C and the measurement object E, which generates an AC voltage drop on the measuring object, and feeds the AC amplifier through assist grounding. The electrode P amplified, and then multiplied by multiplying by multiplying by a power switch to display the instrument header head, you can get three different number limits: 0 ~ 2Ω0 ~ 20Ω0 ~ 200Ω. Nearly the resistance tester is suitable for measuring the electrical resistance of low resistance of various departments such as various devices and power postal railway communication mining; Nearly the ground resistance tester also measures soil resistivity and ground voltage. Technical parameters： Working Conditions Ambient temperature 0℃～+45℃ Relative humidity ≤85%RH Measurement range and constant current value (effective value) Resistance 0～20Ω(10mA)，2～200Ω(1mA)，20～2000Ω(0.1mA) Voltage AC0～19.99V Measurement accuracy and resolution Precision rowspan 0～0.2Ω≤±3%±1d 0.2Ω～1999.9Ω≤±1.5%±1d 1～19.99V≤±3%±1d Resolution 0.01Ω、0.1Ω、1Ω、0.01V Measurement error caused by auxiliary grounding resistance and ground voltage Allow auxiliary grounding resistance RC(between C1 and C2) 0～20Ω≤1kΩ 20～2000Ω≤2kΩ RP(between P1 and P2) < 40kΩ， Error≤±5%