On 08/13/2017 01:00 AM, Erik Christiansen wrote:
On 12.08.17 15:18, Gene Heskett wrote:
A gismo called a Capacitor Wizard, around $200 from a guy in Kansas City
does the definitive such test, measuring the equivalelent series
resistance, aka ESR, and any capacitor that reads over 2 ohms ought to
be replaced.
Like Chris, I bought a $10 kit from Banggood, same PCB & firmware
(judging by the sisplay) as this one:
http://www.ebay.com/itm/DIY-Kits-Capacitance-ESR-Inductance-Resistor-LC-Meter-Tester-NPN-PNP-Mosfet-M168-/181303499014
I put 3 clipleads on it - much more convenient than a restrictive
in-line socket. A beercan-sized electrolytic's finger-thick terminals go
into a DIL socket only with difficulty.
It's not accurate to twenty decimals, but I'm just looking for 5
milliohms or fifty - which it does with aplomb. (Leaving $190 change on
the wizard.)
Ah, here's the kit I bought:
https://www.banggood.com/86-Plastic-Shell-DIY-Meter-Tester-Kit-For-Capacitance-ESR-Inductance-p-956240.html?rmmds=search
Erik
I bought this kit a number of years ago - Blue ESR:
<http://www.flippers.com/BlueEsr.html>
Allows in-circuit and out of circuit testing of caps. Been very useful
bringing old Tektronix precision measurement equipment back to life.
Mark
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