The large ground grid ground resistance tester is suitable for testing the power frequency grounding impedance, contact voltage, step voltage, transfer potential, field surface potential gradient and other power frequency characteristic parameters of various grounding devices, as well as soil resistivity.This instrument uses heterodyne anti-interference technology, which can accurately measure data at 50Hz power frequency under strong interference environments. The test current is relatively small (maximum 5A), which will not cause excessive potential rise of the grounding device during testing. At the same time, it has strong anti-interference capability, so measurement can be carried out without power outage.
1. Good power frequency equivalence. The test current waveform is sinusoidal, and the frequency difference from power frequency is only 5Hz. Measurements are made using two frequencies: 45Hz and 55Hz.
2. Strong anti-interference capability against ground voltage. This instrument uses the heterodyne method combined with modern software and hardware filtering technology, giving it high anti-interference performance and stable, reliable test data. The error caused by 30V power frequency interference voltage is not greater than 0.002Ω.
3. High accuracy. It can be used to measure large ground grids with very small grounding impedance.
4. Powerful functions. It can measure all characteristic parameters of grounding devices specified in relevant standards. Not only can it measure grounding impedance, but also resistance and reactance components.
5. Can measure on-site interference, making it convenient for users to estimate measurement errors.
6. Equipped with disconnection alarm function to avoid incorrect measurements.
7. Simple operation. Full Chinese menu-based operation, directly displaying measurement results.
8. Can save 50 sets of measurement data, and comes with a built-in micro printer for on-site printing of measurement results.
9. Low wiring labor, no need for large current cables.
10. This instrument is small in size, light in weight, and easy to carry.
Technical specifications:
1. Impedance measurement range: 0～200Ω
2. Resolution: 0.001Ω
3. Measurement error: ±(reading ×1% + 0.002Ω)
4. Anti-ground voltage interference capability: error caused by 30V power frequency interference voltage is not greater than 0.002Ω (when test current is not less than 3A)
5. Test current waveform: sine wave
6. Test current frequency: 45Hz, 55Hz dual frequency
7. Maximum output current: 1, 3, 5A
8. Maximum output voltage: 150V
9. Measurement line requirements: current line copper core cross-sectional area ≥1.8mm2
voltage line copper core cross-sectional area ≥1.5mm2
