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August 2016

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Subject:
From:
Wayne Thayer - EXT <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer - EXT <[log in to unmask]>
Date:
Wed, 31 Aug 2016 14:17:54 +0000
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4 wire shouldn't be necessary. Threshold should be around 1ohm or 0.5 ohm. This is determined by when the variable portion of the contact resistance is "close to or greater than" the resistance being measured. 4 wire can get you into the milliohms, which is nice if you are trying to find the location of a short.

Wayne

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
Sent: Wednesday, August 31, 2016 6:31 AM
To: [log in to unmask]
Subject: [TN] Bare board testing - low continuity threshold

We have a customer that requires "DC resistance testing" of particular nets on a PCB to a 2 ohm threshold.

 

Understanding certain PCB flying probe manufacturers offer a "4-wire kelvin"
testing option on their equipment, my question is: At what point do you require the 4-wire option to be used? Or in other words, what is considered "low ohm" as it pertains to PCB electrical testing?

 

Craig Sullivan

Manufacturing Engineer

IT Administrator

Phone:  (607) 266-0480 x115

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