Characteristics of the products
1.Adopt high strength aluminum alloy case, in order to prevent power frequency and radio frequency interference, it use phase-locked loop synchronously tracking detecting method, and also equip with switching capacity filter, that make the tester with high anti-jamming capability.
2.Adopt DC / AC conversion technology, change DC to AC low frequency constant current, in order to measure.
3.Allow the earth resistance changing between 0~2KΩ (RC) and 0~40KΩ (RP), it does not affect the measured result.
4.No need to regulate balance artificially, 3(1/2) bit LCD display, not only can measure the earth resistance, but also can measure low resistance conductor resistance, earth resistivity and AC earth voltage.
5.If measure the test loop fails, the meter shows "1", means overflow, that conform to the standard habit of measurement.

Product introduction
The Digital Earth Resistance Tester abandon the traditional hand generate working method, use advanced large scale integrated circuits, apply to DC / AC conversion technology, which combine the three terminal and four terminal measurement models into a new earth resistance measuring instrument.
Operation principle: Transform DC into AC low frequency constant current by build-in DC / AC converter, then through the auxiliary earth electrode C and tested object E form a circuit, it will generate AC voltage drop on the measured object, through the auxiliary ground electrode P send into AC amplifier to magnify, and through the detector into the meter to display. By using the multiplying power, can get three different range: 0~2Ω, 0~20Ω, 0~200Ω.
This tester applies to measure ground resistance of various devices and low resistance conductor resistance in electricity, telecommunications, railways, telecommunications, mining and other sectors; This tester also can measure soil resistivity and ground voltage.

Parameters of products
1. Operation condition temperature:0℃~+45℃
Relative humidity: ≤85%RH
2. Measurement range and constant current value (Valid value)
   Resistance: 0~2Ω (10mA), 2~20Ω (10mA), 20~200Ω (1mA)
Voltage: AC  0~30V
3. Measure accuracy and resolution
Accuracy: 0~0.2Ω≤±3%±1d
  0.2Ω~200Ω≤±1.5%±1d
  1~30V≤±3%±1d
Resolution: 0.001Ω, 0.01Ω, 0.1Ω, 0.01V
4. Auxiliary grounding resistance and error caused by grounding voltage
Allowed auxiliary grounding resistance RC( between C1 and C2)<1.8KΩ;
RP( between P1 and P2)<40KΩ, Error ≤±5%
Allowed grounding voltage ≤5V (power frequency valid value)  error ≤±5%
5. Power and power consumption
Max power consumption ≤2W
Power supply: 6.8V~9V (7 5#rechargeable battery group), external AC 220V power source.