[Test-Equipment] Megger Biddle 63220 Earth Tester

[J Forster]

I can't help with a manual, but it sounds like a guarded 4 Terminal Ohmmeter.
C1 & P1 are Current 1 & Potential 1 respectively. The other leads are are C2 &
P2 meaning Current 2 & Potential 2.;

Get a known low value R, of the order of a few ohms and connect the leads as
shown:

C1--P1---- RESISTOR----P2--C2

Leave the Guard loose.

Crank the thing and use the knobs to balance the bridge.

I hope it works for you,
Best,
-John





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