One last thing to add to the thread. The parts had drifted  about 12%.  In
addition, the older instruments have 100ohm source impedance. In order to
measure these we need an instrument with 30ohm source impedance. I can't
explain why this is the case but the higher source impedance did not give
accurate values.

On Wed, Jul 18, 2018 at 7:59 AM Guy Ramsey <[log in to unmask]> wrote:

> 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?
>