Guy,
Read this and try putting the parts through their Curie point and test them again. We have seen this on some parts here.
https://www.johansondielectrics.com/ceramic-capacitor-aging-made-simple
Drew
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Wednesday, July 18, 2018 7:00 AM
To: [log in to unmask]
Subject: [TN] capacitor measurement
I got pulled into a Receiving Inspection problem. Our test instrument, an old HP 4192A impedance meter, and a newer Instek 6020 tell us that our X5R capacitors are out of spec.
A 100uF, 10%, 6.3V capacitor measures between 25% and 30% below the nominal value. The instruments have Kelvin probes and are zero calibrated at frequrency, 120Hz the test waveform is 500mV rms.
Does anyone have any advise?