Well, I'll Be. I cooked them at 150C for an hour and they measure 100uF I learned something today. On Wed, Jul 18, 2018 at 8:08 AM <[log in to unmask]> wrote: > 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? >