Re: ESR Meters.
I’ve got an old Wayne Kerr 4225 automatic LCR bridge, which is configured nicely as a component tester. I used it the other day to test some cheap electrolytics which had just come in the post. First one on test showed a slightly low value for C and an unimpressive value for ESR, but then I went off to answer a phone call. Coming back ~30 minutes later, I was pleased to see that the readings had changed quite favourably, especially the decrease in ESR. Then I remembered I’ve seen this before with both brand new and NOS electrolytics; it’s really best to charge and then discharge them, just to remind them that they are capacitors. The testers usually only apply mV levels of bias, so that they don’t affect semiconductors when doing on-board tests, so charging and discharging on a suitable psu, to near their maximum voltage, can influence the measurements quite a lot.
B
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