Suitable for testing the power frequency grounding impedance, touch voltage, step voltage, and other power frequency characteristic parameters of various grounding devices, as well as soil resistivity. Can measure substation ground grids (4Ω), thermal and hydro power plants, microwave stations (10Ω), and lightning rods (10Ω) in a multi-purpose model.
Product Features:
>Adopts a new type of variable frequency AC power supply, and uses microprocessor control and signal processing measures to effectively solve the anti-interference problem during testing, simplify the test operation process, improve the accuracy and precision of test results, and greatly reduce the labor intensity and test cost for testers.
>Heterodyne anti-interference technology can accurately measure data at 50Hz under strong interference environments. The test current is 5A, which will not cause excessive potential rise of the grounding device during testing. It also has strong anti-interference capability, so measurement can be performed without power outage.
>Good power frequency equivalence. The test current waveform is sinusoidal, with a frequency only 5Hz different from the power frequency, using 45Hz and 55Hz for measurement.
>Strong anti-interference capability. This instrument uses the heterodyne method for measurement, combined with modern software and hardware filtering technology, giving the large ground grid ground resistance tester high anti-interference performance and stable and reliable test data.
>High accuracy. The basic error is only 0.005Ω, allowing measurement of large ground grids with very low grounding impedance.
>Powerful functions. Can measure current stake, voltage stake, ground resistance, step voltage, and touch voltage.
>The large ground grid ground resistance tester is easy to operate, with a full Chinese menu-based operation, directly displaying measurement results.
>Low wiring labor, no need for high-current cables.
Technical Parameters:
>Measurement Range: 0～200Ω
>Resolution: 0.001Ω
>Measurement Error: ±(Reading×2% + 0.005Ω)
>Output Voltage: AC 420V (45Hz, 55Hz, dual frequency, sine wave)
>Output Current: AC 5A (45Hz, 55Hz, dual frequency, sine wave)
>Current Output Gears: 5/4.5/4/3.5/3/2.5/2/1.5/1A, one gear per 0.5A, 9 gears in total.
>Anti-interference Capability: Resists 50Hz voltage of 10V
>Measurement Wire Requirements: Current wire copper core cross-sectional area ≥1.5mm2
Voltage wire copper core cross-sectional area ≥1.0mm2
>Power Supply: AC 220V±10%, 50Hz
>Dimensions: 440×350×210
