[Test-Equipment] Megger Biddle 63220 Earth Tester

[Glenn Little WB4UIV]

In an earlier life I used something similar to this (may have been the same 
model). I was testing for ground resistance. The application was to measure 
the effectiveness of a tower ground system. As I remember, The "C" 
terminals were current and the "P" terminals were potential. There were 
long wires attached to each of these terminals. The length was somewhat 
specific. They also hand to be in a somewhat straight line. Current was 
injected into the ground and you measured the induced potential.  The 
switch set the full scale resistance reading. Our goal was 5 Ohms or less, 
rarely achieved.

I know that this is somewhat vague, but that is about all that I can 
remember. There was an instrument with filters for ground noise. We needed 
one of these at one site due to the industrial noise in the area. We could 
not get a meaningful reading at this site due to the noise.

Hope this helps
73
Glenn
WB4UIV

At 08:53 PM 06/04/07, Dave Benham wrote:
>I picked one of these up at a ham swap yesterday.  When I  bought it, I
>figured I could find a manual online, but I've struck out so far.  It
>appears to be a device for measuring ground conductivity or effectivity.
>
>Can anyone direct me to a manual, or roughly how to use this device?
>
>It has 5 binding posts across the top of it labeled, C1, P1, Guard, P2 and
>C2.  The front face has a centering anolog meter, a 4 position resistance
>switch labeled .01, .1, 1 and 10, and 3 0-10 "digital" rotary switches.  On
>the side there is a fold out hand crank.  On top and bottom (perhaps the
>sides if oriented differently), there are two posts that look like what a
>carrying strap might attach to.
>
>Any help would be appreciated.  Thanks.
>
>Dave  K8TRF
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