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Re: [IRCA] Measuring D-C resistance of ground rods to earth
- Subject: Re: [IRCA] Measuring D-C resistance of ground rods to earth
- From: Nick Hall-Patch <nhp@xxxxxxxx>
- Date: Sat, 14 Jul 2007 16:45:09 +0000
At 05:30 14/07/2007, Chuck wrote:
>You might want to do a Google for "three point method" and "fall of
>potential". These are the two standard methods for measuring grounding
>resistance. You should easily find tutorials from manufacturers of testing
>equipment.
http://www.antennasbyn6lf.com/measurement_of_soil_characteristics/index.html
gives an interesting take on trying to measure ground conductivity
and other parameters at 1MHz and higher. Most of the traditional
methods use power line frequencies; however, I've used the three
point method using an AC generator at various frequencies up to 5
MHz, and ended up getting really confused with the results
(decreasing conductivity with frequency....). Ran out of time, and
never went back to it.
I like Charles' idea of using an RF ammeter, though suspect
milliammeter might be more appropriate if you're not using a
transmitter. Starting with an ammeter is good; it's painful to see a
good meter die because you underestimated the expected current.
Let us know how it goes.
best wishes,
Nick
****************************************************************************
Nick Hall-Patch
Victoria, B.C.
Canada
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