The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.

This is a series of short articles about soil resistivity testing. And common errors encountered, as well as practical advice on how to avoid common errors. The soil resistivity test reading is unstable.

So, when conducting soil resistivity testing. Due to poor connection, there may be unstable readings. In addition, through high contact resistance. And background noise with frequencies similar to those used by the measuring equipment. Metal structures buried nearby, equipment malfunctions, operator errors, and other factors.

The soil resistivity test reading is unstable

When testing soil resistivity, it is important to eliminate the cause of unstable readings.

Therefore, ideally, after soil resistivity testing. The soil correlation measurements are plotted on logarithmic grid paper on site to allow for the detection of irregular measurement values. Therefore, unstable readings have been eliminated so that corrective measures can be taken immediately.

Therefore, compare the soil resistivity reading with the electrode spacing. Additionally, expect a smooth curve. The sharp change indicates the need to check the equipment settings. Therefore, repeat your measurement. In addition, additional measurements were taken at shorter and larger electrode spacings close to the problematic electrode spacing.

1. In the Wenner method and the 4-pin method, only the distance between the two internal potential electrodes is different.

2. Please note that only the area near the electrode where current is injected wets in this way. This will not significantly affect the measurement. However, compared to the distance between electrodes, please ensure that the wetting area is smaller.