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g_nraja
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Join Date: Oct 2008
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Measurement of Earth Resistance Value

02/21/2013 2:46 AM

Is there any possiblity to measure the earth resistance between earth pits by using digital multimeter provided no physical connection between these two earth pits.
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electronick
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#1

Re: Measurement of earth resistance value

02/21/2013 6:24 AM

that´s a very good question! what do you think?

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PeterT
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#2

Re: Measurement of earth resistance value

02/21/2013 8:16 AM

No, you cannot accurately measure the earth resistance using only a digital multimeter. The instrument is not designed to accomplish what you desire. That is why there are specialized earth resistance meters on the market. They are 4-terminal devices that inject a current into the earth between two probes, and measure the resulting voltage between two separate sensing probes to calculate the resistance. Check out meters by Megger® or AEMC Instruments®, for example.

A good introduction to ground grid testing can be found as a free PDF at the following link:

http://www.biddlemegger.com/biddle-ug/GettingDownToEarth-MC.pdf

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g_nraja
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#3
In reply to #2

Re: Measurement of earth resistance value

02/21/2013 9:46 AM

in my case they have checked the continuity between two earth electrodes (ensured no connection from the earth electrodes), it is showing continuity between these two electrodes using digital multimeter.

Will it show continuity?
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lyn
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#4
In reply to #3

Re: Measurement of earth resistance value

02/21/2013 12:32 PM

Did you read #2 above?
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#8
In reply to #3

Re: Measurement of earth resistance value

02/25/2013 5:46 AM

The statement in the first paragraph of this post answers the question raised in the original posting at the top, and the question in the second paragraph of this post is rendered superfluous by the content of the first paragraph.

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cuba_pete
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#5
In reply to #2

Re: Measurement of earth resistance value

02/21/2013 1:54 PM

That publication is on my shelf and I used it as a reference for an internal document. It has good, useful, easy-to-understand information.

I use both the Biddle Megger and the Fluke Earth Ground Tester.

GA
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ronron
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#6
In reply to #5

Re: Measurement of earth resistance value

02/22/2013 10:03 AM

Dear All

In our project we do measure earth resistance value by using Earth tester 3rod.

1 rod will be connecting to the earth rod under test and the other two will srive to earth 10Mtrs apart.

Regard
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electronick
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#7

Re: Measurement of Earth Resistance Value

02/25/2013 4:44 AM

If you want to measure the resistance of two chunk´s of earth, physically separated, yes, you can!

in more than one way!

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cuba_pete (1); electronick (2); g_nraja (1); lyn (1); PeterT (1); PWSlack (1); ronron (1)

Previous in Forum: Photometry - Luminance Limitation Curves   Next in Forum: Induction Motor Starting Current on "NO-Load" and "ON-Load"?

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