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Old 05-29-2023, 07:26 AM   #1
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Default Samxon capacitor esr

Hi all,
I need your advice.
-SAMXON 2200uf 50V tested 0.00 esr on Dick Smith Blue Esr meter and 2027 ohm on FLUKE 179 multimeter.
-Is this esr reading realistic?
Thank you
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Old 05-29-2023, 07:45 AM   #2
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Default Re: Samxon capacitor esr

the fluke cant read esr, esr is done using AC current.
the fluke is telling you the cap has internal leakage

if you read capacitance it will probably be well over what it should be.
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Old 05-29-2023, 01:29 PM   #3
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Default Re: Samxon capacitor esr

Typical 2,200uF 50V cap has ESR from around 0.264Ω-0.030Ω for low ESR types.
If the cap has 40V on it with 2,207 ohms leakage... that is 0.8W which is a problem.

Check your Blue ESR meter is working using a resistor, like 1Ω or 0.5Ω
It does not use AC, but instead a DC pulse of 0.5mA, 5.0mA or 50mA depending on range.

I have trouble testing with these cheap Asian caps, the electrolyte acts like a lead-acid battery lol then you add corrosion.
High leakage current and you need an AC test (dual slope) to measure capacitance. I'm not sure what the Fluke 179 is doing, the 87-V is single slope I thought.
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