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DER-EE DE-5000 ESR zero measurement problem.

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TA3UIS:
I connected 3 pieces of 1ohm parallel resistor in series to a 10,000uf capacitor. ESR measurement was successful.
What would this measurement reveal?

Is DE-5000 good or defective?

KungFuJosh:
Your meter works fine. All meters have limitations, and right now you're learning the limits of this one.

The purpose of adding a known resistance in series is so that you can subtract the difference to find your ESR. So you need to also measure your resistor(s) separately to know that value. If you add a 1ohm resistor in series with the cap, and you get 1.1ohm reading, your ESR is 0.1ohm.

TA3UIS:

--- Quote from: KungFuJosh on April 19, 2024, 06:13:41 pm ---Your meter works fine. All meters have limitations, and right now you're learning the limits of this one.

The purpose of adding a known resistance in series is so that you can subtract the difference to find your ESR. So you need to also measure your resistor(s) separately to know that value. If you add a 1ohm resistor in series with the cap, and you get 1.1ohm reading, your ESR is 0.1ohm.

--- End quote ---

As far as I understand, the purpose here is to bypass the limitations of the device, right?
Some kind of hack by connecting a 1ohm series resistor.

sonpul:
You can view ESR in RS mode.

KungFuJosh:

--- Quote from: TA3UIS on April 19, 2024, 06:25:53 pm ---As far as I understand, the purpose here is to bypass the limitations of the device, right?
Some kind of hack by connecting a 1ohm series resistor.

--- End quote ---

More math than any hacking. As sonpul said, you can use Rs mode instead to show ESR without seeing the C at the same time.

For example, in Cs a 2200µF cap shows correctly for me as 2.2mF but ESR says 0.0. In Rs mode it shows 0.02Ω. For comparison, my ST2832 shows Rs as 0.02424, so the DE5000 did fine.

Thanks,
Josh

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