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Why does a 4-Wire resistance measurment on a 34401A with no leads connected report a short when the range is set to 100 ohms?

Question asked by Irish on Jul 5, 2017
Latest reply on Aug 2, 2017 by tomc

I have multiple 34401A that we use for automated testing and recently noticed that the value is a short when nothing is connected(including leads) and the ranged is fixed at 100 ohms.  This includes front and rear measurements.  My understanding is that this should indicate open.  The 2-wire measurement indicates overload.  My 34410A shows overload in the same setup.

 

Thank you all for your assistance ahead of time.

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