|[AMRadio] Test equipment - Heathkit capacitor tester|
k4kyv at charter.net
Sat Nov 18 11:21:05 EST 2017
> From: amradio-bounces at mailman.qth.net [mailto:amradio-
> bounces at mailman.qth.net] On Behalf Of Jim Hill
> My Heath capacitor tester has a leakage tester. The capacitance range
> selector is frozen, but the the leakage tester is very useful for
> electrolytics. I like to not replace electrolytics until I get the
> running and see where I stand. If you work on yours, check the resistors
> the voltage range switch.
I use mine (pulled from a dumpster) primarily for the leakage test, which
works very well for checking leakage as well as reforming electrolytics.
The capacitance measurement is all but useless: very inaccurate, lucky to
get within 50% so I never use that; I have my NEC digital capacitance meter
which is accurate and with ranges down to a few pf.
I sometimes use the leakage test as a low-current voltage source for up to
450 volts or so. Once a capacitor shows low leakage with the magic eye, I
sometimes connect my DVM in the micro amp range, or a 50 micro amp panel
meter, in series with the capacitor to measure the actual leakage current at
the test voltage (risky if you are not careful).
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