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R0 loop resistance is about 5~200Ω 
Frequency earth grounding network impedance tester technical parameters:
Frequency conversion earth ground impedance tester wiring diagram and operation method
1, measurement principle diagram and test wiring diagram
Rx test resistance is about 0~200Ω
Rf standard resistance
Measuring current line D: length is 3 to 5 times the length of the diagonal of the ground network; wire diameter: ≥1mm2
Measuring voltage line 1: Length 0.618D; Wire diameter: ≥1.0mm2
Measuring voltage line 2: Connected to the measured network
Measure the ground wire: Connect to the measured ground network.
1, impedance measurement range: 0Ω ~ 200Ω
2, resolution: 0.001Ω
3, measurement error: ± (reading × 2% +0.005Ω)
4, anti-frequency 50Hz voltage interference capacity: 10V
5, test current waveform: sine wave
6, test current frequency: 45Hz/55Hz 49Hz/51Hz and other groups of automatic double conversion
7, the maximum output current: 3A
8, the maximum output voltage: 400V
9, measuring line requirements: current line copper core cross-sectional area ≥ 2.0mm2
Voltage line copper core cross-sectional area≥1.5mm2
10, power supply: AC220V ± 10%, 50Hz
11. Overall dimensions: 440×350×210
12, the weight of the instrument: 10kg