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Capacitor measurement on Pins

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eumesh49

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Hi,
I was trying to measure capacitor to ground for the pins of of my our product. I have 10 output pins with 220nF installed on board.
I used an high end Fluke handheld meter, and then tried to use a bench LCR meter. My all the pins shows the capacitance between 250nF to 400nF, which looks good.
My few pins measures cap around 2uF to 4uF. They consistently measures the same. I tried with different multimters.
I tried doing an electrical measurement by creating a low pass filter on those pins and apply a pulse voltage via 10k series resistor. My calculation based on measurement was showing 400nF.
I am not sure, why meter measurement reading looks so different.
I am putting it in this forum if anyone had similar experience.
Thanks in advance.

Reg.
Umesh
 

Congratulations for the most confusing post of the month.

You say "all the pins ... 250nF to 400nF". Then you say "few pins... 2uF" Does mean NOT all the pins measure 240-400nF?

Then you say "My calculation based on measurement was showing 400nF...". Well, which is it 2uF or 400nF? I suspect there's something wrong with how you are measuring this.

How did you measure the capacitance for your LP filter approach? With an oscilloscope?
 

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