Milliohm meter

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#1 21662675 21 Jun 2012 02:45

JAWED MATEEN JAWED MATEEN

Anonymous

Post #1
21662675 21 Jun 2012 02:45

I want to measure resistance in the range of 1 milliohms to 10 ohms..
Please advice if somebody has an idea or circuit diagram..

Regards

Jawed Mateen
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#2 21662676 21 Jun 2012 03:24

Elba R Dalet Elba R Dalet

Anonymous

Post #2
21662676 21 Jun 2012 03:24

You can use a Wheatstone Bridge:
here you have a lot of information; http://en.wikipedia.org/wiki/Wheatstone_bridge

Hope it is useful

Regards

Elba
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#3 21662677 21 Jun 2012 03:46

Peter Evenhuis Peter Evenhuis

Anonymous

Post #3
21662677 21 Jun 2012 03:46

A wheatstone bridge will great its own problems for miliohm. If you have low current it has high noise if you have high current you are heatingup the object that you are testing etc.

I made a other solution based on the application note from linear technology.
http://cds.linear.com/docs/Application Note/an98f.pdf
Go to page 10 & 11
It is a easy design that works good and it is not affected by noise and keeping current low.
i hoop you like it.
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#4 21662678 21 Jun 2012 10:48

Steve Lawson Steve Lawson

Anonymous

Post #4
21662678 21 Jun 2012 10:48

Because the app note URL has a space in it, it doesn't "auto link" very well. Here it is again in clickable form (fingers crossed ;)

"http://cds.linear.com/docs/Application Note/an98f.pdf(http://cds.linear.com/docs/Application%20Note/an98f.pdf)":
#5 21662679 21 Jun 2012 13:00

JAWED MATEEN JAWED MATEEN

Anonymous

Post #5
21662679 21 Jun 2012 13:00

Thanks peter,
I will try this circuit and let all know the result.
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