Re: Amp Meter
From: Roger Johansson (no-email_at_home.se)
Date: 02/18/05
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Date: 18 Feb 2005 20:38:46 GMT
Jamie <jamie_5_not_valid_after_5_Please@charter.net> wrote:
> that looks to be a 150 uA meter at full scale.
> if memory serves,.i think you said the meter was a 0.050 mv?
>
> to get a 6 amp scale.
> 6.00 - .000150 = 5.999850
>
> Shunt = 0.050 / 5.999850 = 0.0083 ohms
>
> i think that is correct,i normally measure the
> coil R and use the I (current) to do all of this
> how ever, this should still work.
> this is just off the top of my head, i am sure some
> one will correct me.
>
I think you are right.
In practical terms: Take a piece of copper wire, diameter 1-2mm.
Send 1 Amp through it. Put the wires from the meter together on that
wire. Pull them slowly apart until the meter reads 1 Amp. Mark these
measuring points and solder the instrument wires to them. Cut off the
thick wire outside the measuring marks and attach the current connections
to the ends of the wire.
-- Roger J.
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