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Results of safely turning a good cap into a bad cap and ESR measurements (x-post from /r/askelectronics)
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As a followup to my previous post:

I decided to take a known good 22uF 50V electrolytic cap, KMA branded 105'C rated, and run it with reverse voltage from my bench supply. Current limited to 20mA and I upped the voltage slowly until the limit hit. I then shorted the cap to discharge it (mostly) and tested it with DC volts on my meter. It showed a voltage of around -500mV after 5 mins of shorting. I then tested it again with the ESR meter.

Results before reverse-polarity volting:

  • 23.15uF on the LCR
  • 1.14R on the ESR (in-spec)

Results after:

  • no LCR test because it doesn't have protection against charged caps and I didn't want to possibly damage it. Will update later

  • 2.6R on the ESR (out of spec!)

Youtube video:

Imgur album:

Hope this maybe proves interesting even if it is somewhat pointless.

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10 years ago