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mansoor
Guest
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 Posted:
Sun Dec 04, 2005 5:35 pm Post subject:
earth tester |
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every body ! kindly ;show me the way that I can design my own earth
tester,I need to a circuit diagram.
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Phil Allison
Guest
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| Posted:
Sun Dec 04, 2005 5:35 pm Post subject:
Re: earth tester |
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"mansoor" <mansoor850@gmail.com> wrote in message
news:1133698333.337669.175500@z14g2000cwz.googlegroups.com...
| Quote: | every body ! kindly ;show me the way that I can design my own earth
tester,I need to a circuit diagram.
|
** So you want an electronic soil analyser ?
These Google Groupies are such a hoot.
........... Phil |
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legg
Guest
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| Posted:
Mon Dec 05, 2005 12:48 am Post subject:
Re: earth tester |
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On 4 Dec 2005 04:12:13 -0800, "mansoor" <mansoor850@gmail.com> wrote:
| Quote: | every body ! kindly ;show me the way that I can design my own earth
tester,I need to a circuit diagram.
|
Test for what?
Continuity?
Static discharge safe limits?
Salinity?
RL
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mansoor
Guest
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| Posted:
Mon Dec 05, 2005 1:35 am Post subject:
Re: earth tester |
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| thanks . to measure soil resistivity. |
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mansoor
Guest
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| Posted:
Mon Dec 05, 2005 1:35 am Post subject:
Re: earth tester |
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| thanks . to measure soil resistivity. |
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John Popelish
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Ken Smith
Guest
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| Posted:
Mon Dec 05, 2005 3:46 am Post subject:
Re: earth tester |
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In article <1133741271.703186.65590@z14g2000cwz.googlegroups.com>,
mansoor <mansoor850@gmail.com> wrote:
| Quote: | thanks . to measure soil resistivity.
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How far down into the soil do you want to be able to see?
Do you want a profile or just a single value?
Is your local mains frequency 50Hz or 60Hz?
I'll assume 60Hz
(1) Make a good 30Hz square wave that is isolated from any other earthing.
This needs to be about 25V and able to output several amps.
(2) Make a synchronous detector circuit. Followed by a filter that cuts
off at about 0.5Hz.
(3) Sync the detector (2) to the generator (1) via an opto isolator.
(4) Drive large spikes (1cm Dia 20cm long) into the soil like this
ASCII Art:
---I--- ---V---
! ! ! !
V V V V
--------------------------------------
Soil
(5) Measure the voltage you get for some known current and apply a
"geometry factor" to get the resistivity.
--
--
kensmith@rahul.net forging knowledge |
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Paul Hovnanian P.E.
Guest
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| Posted:
Tue Dec 06, 2005 8:41 am Post subject:
Re: earth tester |
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legg wrote:
| Quote: |
On 4 Dec 2005 04:12:13 -0800, "mansoor" <mansoor850@gmail.com> wrote:
every body ! kindly ;show me the way that I can design my own earth
tester,I need to a circuit diagram.
Test for what?
Continuity?
Static discharge safe limits?
Salinity?
|
Whether or not he's on earth. ;-)
--
Paul Hovnanian mailto:Paul@Hovnanian.com
------------------------------------------------------------------
Bumper sticker: You're too close for missiles. Switching to guns. |
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Ben Bradley
Guest
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| Posted:
Sun Dec 11, 2005 8:45 am Post subject:
Re: earth tester |
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On Sun, 04 Dec 2005 13:48:31 -0500, legg <legg@nospam.magma.ca> wrote:
| Quote: | On 4 Dec 2005 04:12:13 -0800, "mansoor" <mansoor850@gmail.com> wrote:
every body ! kindly ;show me the way that I can design my own earth
tester,I need to a circuit diagram.
Test for what?
Continuity?
Static discharge safe limits?
Salinity?
|
Immunity to excessive heating?
>RL |
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