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E4980AL has creeping measurements on known capacitor

Question asked by valkyrie on Mar 8, 2019

Our new LRC meter doesn't give a stable measurement on a known 100nF capacitor. After setup and correction, it reads ~95nF, which creeps down over time.

 

My current setup has a sheet of copper foil on the desk with the meter, which is attached to the LC connector per the Impedance Measurement Handbook's suggestions (am using these probes: https://canada.newark.com/b-k-precision/tl-889a/kelvin-clip-to-four-bnc-lead/dp/97J7626?ost=TL889A ). ALC is unable to regulate. I am measuring at 150kHz with 0 DC Bias, 1V level.

 

It seems to be a DC leak somewhere in the system that isn't getting compensated for, as I can see the Z values changing over time. Current is constant, but voltage across the cap is increasing.

 

Please advise.

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