How is the grounding resistance measured?
Instrument working principle:BY2571 digital ground resistance tester is based on BCY- II, abandoned the traditional artificial hand power generation mode, using advanced large scale integrated circuit, application of DC/AC technology will transform three terminal and four terminal measurement method with a new type of grounding resistance tester.The working principle is that the machine DC/AC converter of low-frequency DC into AC constant current through the grounding electrode, auxiliary C and analyte E loop on the measured object generated by the auxiliary AC voltage, grounding P into AC amplifier, then rectified into the meter display. By multiplying the switch, three different limits are obtained: 0~2, 0~20, 0~200.
This table applies to the electric power, post and telecommunications, railways, communications, mines and other departments to measure the grounding resistance of various devices and to measure the resistance of the conductor with low resistance. This meter also measures the soil resistivity and ground voltage.
The structure adopts the high strength aluminum alloy as the shell, and the circuit is used to prevent the power frequency and radio frequency interference. The PLL is used to track the detector synchronously, and the switch capacitor filter is used to make the instrument have better anti-interference ability.The DC/AC converter is used to convert the DC to the low frequency constant current of AC to facilitate measurement.Allowing the auxiliary ground resistance to vary between 0~2K (RC), 0~40K (RP), without affecting the measurement results.This instrument does not need manual adjustment of balance. 3 (1/2) bit LCD display, besides measuring ground resistance, it can also measure low resistance conductor resistance, soil resistivity and AC ground voltage.If the test loop is blocked, the meter indicates that "1" represents overflow and conforms to the conventional measurement habits.