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June 2010

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Subject:
From:
Rex Waygood <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Rex Waygood <[log in to unmask]>
Date:
Wed, 23 Jun 2010 15:03:17 +0100
Content-Type:
text/plain
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text/plain (65 lines)
A 4 wire measurement system removes the resistance of the leads.
It usually uses a constant current via two wires and then measures
voltage with the other two across the uut.
It is a common technique for low value resistance measurement, where
often the lead resistance of a DMM could swamp the reading because the
constant current source and the voltage measurement are at the 'wrong'
end of the leads..
OK?



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: 23 June 2010 13:52
To: [log in to unmask]
Subject: [TN] Resistance measurement

Fellow TechNetters:

   What is the difference between a 4 point measurement system and
conventional DMM measurement?
Should the readings be identical or within a tolerance?
Depending on scale settings and tolerance of instrument.

Measurement conducted on DIMM net on a populated board.

Victor,

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