ESR of general purpose caps / Chieftec HPC-360-202

[willawake]

what should the ESR of general purpose caps be. for instance a teapo SH

[Rainbow]

Re: ESR of general purpose caps

It probably varies between brands and series. I often use KOME 2200uF/16V (10mm) caps - my ESR meter shows 0.1ohm (the lowest it can) on them. I also have some Yageo 2200uF/16V caps (they came by a mistake as I ordered the KOME ones) - they're too wide (13mm) and the ESR is also worse - meter shows 0.1 but jumps to 0.3 sometimes.

[willawake]

Re: ESR of general purpose caps

well this bulging SH measured 5.5 after desoldering and the ESR slowly climbed to finally 11 after cooling down. I checked the meter with various reference caps in case it was defect but it measured them fine.

[Rainbow]

Re: ESR of general purpose caps

What capacitance is that?

[willawake]

Re: ESR of general purpose caps

1000uf 16v

[Rainbow]

Re: ESR of general purpose caps

5.5 is really bad (not speaking about that 11...) - should be less than 0.5.

[willawake]

Re: ESR of general purpose caps

thats good then. the computer was a work computer which was having a network problem one day, then the next day it bluescreened complaining about tcpip.sys i was wondering if the problem would show up again and be in fact a network card problem.

its this chieftec psu
https://www.badcaps.net/forum/showthread.php?t=1153&

i replaced with fortron bluestorm 500w

the other caps in the psu test fine. i have another 2 of these chieftec psus i will check out and recap.

[willawake]

Re: ESR of general purpose caps

here's another teapo sh 01/03 105oC
same psu type. this time in parents computer.
symptoms : computer does not play any dvd especially land rover demonstration dvd . occasionally computer does not start first time.



dad learns how to test caps achieving world record contender of 9.0 ohm!!!!!

cap replaced with panasonic fc 1000 16v.
dvd exchanged with samsung toshiba pending tests

i have recapped one of these psu with rubycon mcz but i did not like the results. multimeter was showing more voltage fluctuations than before. seems better just to replace this cap using fc or similar.

[gonzo0815]

Re: ESR of general purpose caps / Chieftec HPC-360-202

Yep, the NCZ have rela ylow esr. Not shure of the regulation & control chain like this. The lower ESR will increase the possibility of oscilation too. Any way, most PSu`s i recaped with them are doing fine despite all that.