Main functions:
1. Accurately measure the grounding impedance, grounding resistance, and grounding reactance of large grounding grids;
2. Accurately measure the surface potential gradient of large grounding grid areas;
3. Accurately measure the contact potential difference, contact voltage, step potential difference, and step voltage of large grounding grids;
4. Accurately measure the transfer potential of large grounding grids;
5. Measure the continuity resistance of grounding down conductors;
6. Measure soil resistivity
Fold to edit this section: Overall parameters:
1. Operating conditions
Ambient temperature: 0℃~+45℃
Relative humidity: ≤85%RH
2. Measurement range and constant current value (RMS)
Resistance: 0~2Ω(10mA), 2~20Ω(10mA), 20~200Ω(1mA)
Voltage: AC 0~20V
3. Measurement accuracy and resolution
Accuracy: 0~0.2Ω≤±3%±1d
0.2Ω~200Ω≤±1.5%±1d
1~20V≤±3%±1d
Resolution: 0.001Ω, 0.01Ω, 0.1Ω, 0.01V
4. Measurement error caused by auxiliary grounding resistance and ground voltage
Allowable auxiliary grounding resistance RC (between C1 and C2) <1.8kΩ;
RP (between P1 and P2) <40kΩ error ≤±5%
Allowable ground voltage ≤5V (power frequency RMS) error ≤±5%
5. Power supply and power consumption
Maximum power loss ≤2W
Power supply: 6.8V~9V (6 rechargeable nickel-cadmium batteries), can be charged via external 220V AC power.
Dimensions: 220mm×200mm×105mm
Weight: ≤1.4kg
Fold to edit this section: Precautions:
1. The grounding line should be disconnected from the protected equipment to ensure the accuracy of measurement results.
2. There should be no stray currents or polarized soil near the measured electrode.
3. Do not measure after rain or when the soil absorbs too much moisture, or during rapid changes in climate, temperature, pressure, etc.
4. The detection probes should be kept away from large metal bodies such as underground water pipes, cables, railways, etc. The current probe should be at least 10m away, and the voltage probe at least 50m away. If these metal bodies are not connected to the grounding grid, the distance can be shortened by 1/2 to 1/3.
5. Use well-insulated wires for connections to avoid leakage.
6. Pay attention to the position where the current probe is inserted into the soil, ensuring the grounding rod is at zero potential.
7. The test should be conducted when soil resistivity is high, such as in early winter or during dry summer seasons.
8. There should be no electrolytic substances or decaying matter at the test site to avoid misleading results.
9. If the galvanometer sensitivity is too high, insert the potential probe (voltage probe) shallower into the soil; if sensitivity is insufficient, water the probe to moisten it.
10. Regularly check the accuracy of the instrument.
11. The ground resistance tester should be stored indoors with an ambient temperature of 0℃~40℃, relative humidity not exceeding 80%, and the air should not contain harmful substances that can cause corrosion.
12. Avoid strong vibration during use, transportation, and storage of the tester.
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