When bridges were all we had we managed some very precise measurements with 
them.
If you have three master elements and one to adjust it should be pretty 
simple.
The voltage factors out so it is not especially critical. There is always 
the problem of drift but the masters & the subject should drift together in 
a null configuration.

BTW, please don't anyone offer me an old L&N K2 potentiometer. I am trying 
to get rid of the antiques here!

John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US

----- Original Message ----- 
From: "Daniel Schouten" <d.schouten@quicknet.nl>
To: "PIClist" <PICLIST@MIT.EDU>
Sent: Tuesday, January 16, 2007 1:01 PM
Subject: [EE] Looking for a micro Ohm meter


> Hi all,
>
> I am looking for an instrument to accurately measure a resistance of 100
> uOhms. This instrument will be used in a setup to trim large current
> shunts from 100uOhms -5% to 100 uOhms - 0.25%. Budget is < 2k USD. I have
> seen several options (Agilent, Keithley), but most are too expensive or 
> too
> versatile (I only need to measure low Ohmic values).
>
> Are there any relativily simple but accurate instruments on the market to
> perform this task? I have also heard of building a Wheatstone bridge, but
> this sounds a little bit too experimental for me. The measurements must be
> taken reliably and some volume trimming of shunts might also be involved 
> in
> the near future.
>
> Thanks!
>
> Daniel...
>
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 


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