WDJD-3000B Grounding Resistance Soil Resistivity Tester consists of host, monitoring software, test line, auxiliary ground rod, communication line, etc. The large LCD display of the host, the white screen backlight, and the bar graph instructions are clear at a glance. At the same time, it can store 300 sets of data, and realize historical query and online real-time monitoring functions through monitoring software, dynamic display, alarm indication, and historical data reading, consulting, saving, reporting, printing and other functions.
1. Baseline and working conditions
Amount of influence | influence Base conditions | Working conditions | Remarks |
Ambient temperature | 23℃±1℃ | -10℃～40℃ | ---- |
Environmental humidity | 40%～60% | ＜80% | ---- |
Instrument working voltage | 9V±0.1V | 9V±1.5V | ---- |
Auxiliary grounding resistance value | ＜100Ω | ＜30kΩ | rC、rP |
Interference voltage | None | ＜20V | ---- |
Interference current | None | ＜2A | ---- |
When measuring R, the electrode spacing | a＞5d | a＞5d | ---- |
When measuring ρ, the electrode spacing | a＞20h | a＞20h | ---- |
2. Basic error and performance index under benchmark conditions
function | testing range | accuracy | resolution |
Ground resistance (R) | 0.00Ω～30.00Ω | ±2%rdg±3dgt | 0.01Ω |
30.0Ω～300.0Ω | ±2%rdg±3dgt | 0.1Ω |
300Ω～3000Ω | ±2%rdg±3dgt | 1Ω |
3.00kΩ～30.00kΩ | ±4%rdg±3dgt | 10Ω |
Soil resistivity (ρ) | 0.00Ωm～99.99Ωm | It depends on the measurement accuracy of R | 0.01Ωm |
100.0Ωm～999.9Ωm | (ρ=2πaR | 0.1Ωm |
1000Ωm～9999Ωm | a:1 m～100m； | 1Ωm |
10.00kΩm～99.99kΩm | π=3.14) | 10Ωm |
100.0kΩm～999.9kΩm |
| 100Ωm |
1000kΩm～9000kΩm |
| 1kΩm |
Grounding voltage | AC 0.0～600V | ±2%rdg±3dgt | 0.1V |
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