[RE-wrenches] clamp on ground impedance tester

[Darryl Thayer]

Hi
It can be used off grid, but you have to have two ground sources, so drive two ground rods and measure the resistance you will get the sum of the two resistsnces.  

--- On Sun, 4/18/10, R Ray Walters <ray at solarray.com> wrote:

> From: R Ray Walters <ray at solarray.com>
> Subject: Re: [RE-wrenches] clamp on ground impedance tester
> To: "Jason Lerner" <wapalco at gmail.com>
> Cc: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Sunday, April 18, 2010, 12:57 PM
> I bought the Amprobe DGC-1000A. I
> paid around $1000, but I see they've gone up a bit already.
> I can't necessarily recommend (or berate) the web biz I
> bought it from, so I'm not going to give them a plug.
> I'd just google: the make & model #.
> The Amprobe is very easy to use, but the 2 down sides are:
> 1) It cannot be used for off grid systems, as it depends on
> the grid for its reference.
> 2) It can be hard to get the jaws in tight spots, so you
> need about 2" of exposed ground rod or wire, with 2" of
> clearance in a radius around it.
> (another reason to leave the ground rod sticking out of the
> ground a few inches)
> 
> R. Walters
> ray at solarray.com
> Solar Engineer
> 
> 
> 
> 
> On Apr 17, 2010, at 9:09 PM, Jason Lerner wrote:
> 
> > Hey Ray,
> > 
> > Just saw your post on the wrenches list about the
> clamp on ground impedance tester.
> > 
> > Any chance you could provide model #,  pricing
> and where you got it?  That sounds like just the
> ticket.
> > 
> > Thanks very much,
> > 
> > Jason Lerner
> > Waldron Power and Light Co.
> > (360) 588-6194
> > 
> > 
> > 
> > 
> 
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