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?
>