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Old 06-27-2020, 06:58 PM   #1
powrslave
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Default Is this cap good or bad

It says 470uF 35w and is about 32mm length.
Koshin (M) 85C

I measured with this device I have and I'm trying to understand if it's good or bad.,

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Old 06-27-2020, 07:08 PM   #2
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Default Re: Is this cap good or bad

the uf looks rather high so most likely needs a new one .
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Old 06-27-2020, 11:47 PM   #3
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Default Re: Is this cap good or bad

Bad cap, it is showing the reading of 3401uF for the 470uF cap.
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Old 06-28-2020, 02:36 AM   #4
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Default Re: Is this cap good or bad

it's very bad, when you get huge capacitance readings it means the cap is internally shorting and causing the tester to pump more power into it during the test - as you can see in the VLOSS figure.

a polymer cap can be as high as 2.5%, some electrolytics as high as 1.5%.
anything more is bad.
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Old 06-28-2020, 07:35 PM   #5
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Default Re: Is this cap good or bad

supposed to be 470uF but reading 3401uF? definitely bad.
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Old 06-29-2020, 01:10 AM   #6
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Default Re: Is this cap good or bad

Quote:
Originally Posted by stj View Post
it's very bad, when you get huge capacitance readings it means the cap is internally shorting and causing the tester to pump more power into it during the test - as you can see in the VLOSS figure.

a polymer cap can be as high as 2.5%, some electrolytics as high as 1.5%.
anything more is bad.
I thought 'lytics were/are generally spec'd at 20% tolerance? Do tell.
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Old 06-29-2020, 01:11 AM   #7
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Default Re: Is this cap good or bad

BTW, Did you try checking other capacitors to see if it shows correct value using your meter.
is this KOSHIN Electrolytics cap? What series?
http://www.vek-online.de/files/4188/...02018-2020.pdf
http://www.paullinebarger.net/DS/Kos...hin%20Full.pdf

Last edited by budm; 06-29-2020 at 01:20 AM..
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Old 06-29-2020, 01:19 AM   #8
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Default Re: Is this cap good or bad

Quote:
Originally Posted by ratdude747 View Post
I thought 'lytics were/are generally spec'd at 20% tolerance? Do tell.
I believe STJ is referring to the VLOSS (D.F. - Dissipation Factor or Tan).
VLOSS of 13% = to D.F. of 0.13

For example of Panasonic FR series has D.F. from 0.09 ~ 0.22
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Last edited by budm; 06-29-2020 at 01:23 AM..
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Old 06-29-2020, 02:39 AM   #9
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Default Re: Is this cap good or bad

tolerance means the capacitance can vary by 20% over it's temperature range,
3401 is not within 20% of 470

you liberals always miss-understand tolerance!

Last edited by stj; 06-29-2020 at 02:42 AM..
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Old 07-06-2020, 10:12 AM   #10
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Thumbs up Re: Is this cap good or bad

Quote:
Originally Posted by budm View Post
BTW, Did you try checking other capacitors to see if it shows correct value using your meter.
is this KOSHIN Electrolytics cap? What series?
http://www.vek-online.de/files/4188/...02018-2020.pdf
http://www.paullinebarger.net/DS/Kos...hin%20Full.pdf
Thanks for your support everyone.

I did replace it. Also this bad one was slightly bulging.

They combined series for this one in the chart. When I look for 470 35v the size isn't there but it's below. 15x31.5mm

I will ask in a separate thread for help or if there is virtual services offered.

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Old 07-06-2020, 10:37 AM   #11
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Default Re: Is this cap good or bad

85' temp caps are general purpose, the ESR is never given for them.
and the ripple current(the amount the cap can store and release) cant be tested on small testers.
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