No major question really. Screwed in a 2m long M16 stainless rod for earth today and got around 10 ohms which was better than I planned, but not desperately surprising as its clay soil and only a couple of meters above the river's mean level (i.e. water table).
Measured Zs extension lead to MET = 1.5 ohm, Zs same extension lead to rod = 11.5 ohm.
But what was odd was a DC resistance test (DMM, after low-ohm meter said > 100R) was showing around 170-200-ish ohms in both polarities. I expected I might see a DC bias, but did not expect that sort of non-linearity!
Measured Zs extension lead to MET = 1.5 ohm, Zs same extension lead to rod = 11.5 ohm.
But what was odd was a DC resistance test (DMM, after low-ohm meter said > 100R) was showing around 170-200-ish ohms in both polarities. I expected I might see a DC bias, but did not expect that sort of non-linearity!