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Date: | Wed, 18 Jul 2018 10:22:55 -0500 |
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I think a whole bunch of us learned something today - TechNet is awesome!
Dave
On Wed, Jul 18, 2018 at 10:10 AM, Guy Ramsey <[log in to unmask]> wrote:
> 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?
> >
>
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