IPC Technet Forum rocks, again!



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey

Sent: Wednesday, July 18, 2018 10:10 AM

To: [log in to unmask]

Subject: Re: [TN] capacitor measurement



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?

>