Measuring Capacitor ESR (Equivalent Series Resistance)

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Testing capacitors removed from vintage valve equipment - not straightforward!
Using a component tester, multimeter, megaohm meter and oscilloscope to investigate the condition of an old electrolytic capacitor.
Many of the components in valve equipment are required to work at higher voltages than would be found in solid state electronics, often more than 200volts.
See a real exoert explain this by watching W2AEW's excellent video which inspired me to try this out:
#135: Measure Capacitor ESR with an Oscilloscope and Function Generator
• #135: Measure Capacito...

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7 июн 2024

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Комментарии : 17

@eddiem5220 2 года назад

I'm getting back into electronics again after 30 years so this was very helpful. There's a lot to know about capacitors and measuring their performance. Great video!

@richardnelson1684 4 дня назад

Excellent presentation. Thanks N6WHV

@jeffreyyoung4104 5 месяцев назад

Many people still don't understand why the high voltage test is important with certain capacitors. As shown here, a cap passes all the low voltage tests, but the moment you go above 100 volts, the truth about the cap is reveled! Which is why such tests were important in the tube era, and with high voltage parts, it still is, even if it isn't in tube equipment. But with high voltage circuits, extreme care must be exercised, all the time.

@KissAnalog 3 года назад

Nice example!

@vicvergauwe5736 3 года назад

Very interesting video man !

@Gruntos 3 года назад

When I was In Tech college back in the 70’s we use to charge big capacitors up with a mega and then shouts here catch this..

@hadibq 2 года назад

Thanks, great video!

@KUARIELtv 3 года назад

nice tut

@armandine2 2 года назад

Just measured an unknown (unused) capacitor with unclear markings (ERIE). low voltage results were 500nF and ESR 0.12 ohms with 100kHz test frequency using an LCR meter. It showed 50k-60k ohms on a 250V insulation test - and 1.52mA leakage current. An indication, perhaps, that a working voltage of 250V was optimistic.

@richardnelson1684 4 дня назад

Great job. Thanks for sharing! N6WHV

@ivolol 2 года назад

It's cheap and cheerful chinese components, but it's running open source german software :) You can search "AVR Transistortester - Mikrocontroller" for the homepage of the software. I believe high voltage steady-state leakage and ESR for a certain frequency are really two different measurements in practicality, and yes for high voltage equipment the former can be just as important.

@gordselectronicshobby3853 3 года назад

The Dissipation Factor is more important than ESR.

@LockdownElectronics 3 года назад

I am going to look up what the dissipation factor is, thanks for the pointer....

@erin19030 7 месяцев назад

You woyld have just as much luck as flipping a coin.

@erin19030 7 месяцев назад

This ESR testing is baloney. Not all caps are concentrically wound with a linear length of foil. Modern caps are concentrically stacked cylinder with end caps and naturally have a quite low ESR caps wit so-called low ESR are of no real value un audio circuitry.