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East Tester ET4410 ESR Measure

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Martin72:
Today 10nF glimmer caps arrived with 1% tolerance.
Same as all before, capacitance and Xc values are stable displayed, ESR not.
The unstable values are annoying and at the end useless.

edit: ESR pic titles wrong

mawyatt:

--- Quote from: Martin72 on July 14, 2022, 08:47:06 pm ---Today 10nF glimmer caps arrived with 1% tolerance.
Same as all before, capacitance and Xc values are stable displayed, ESR not.
The unstable values are annoying and at the end useless.

edit: ESR pic titles wrong

--- End quote ---

Those 10nF 1% caps look nice, but can't say much about the Easy Tester. What are the ESR specs on the caps?

Think this is something to do with trying to establish the ESR with an impedance angle of close to 90 degrees, whatever method is utilized. Altho other LCR meters we have like the handheld DE-5000, or Lab type TH2830 and IM3536 don't seem to have this problem.

Maybe others with the same Easy Tester can check with a film 10nF cap??

Best,

Martin72:
According to the Specs, loss factor is about 0.001 at 1khz.

Martin72:
Thinking further about...

When tan phi is 0.001 (specs) and capacitiy is 9.939nf at 1khz(measured), ESR is about 16.949 ohms calculated, see pic with formulars below.
Other calculation then:
Tan phi is ESR/Xc, take the calculated ESR before and then take the measured Xc on 1khz of 16.014kOhm, its about 0.00106 - It makes all sense.
The ET4410 should measure an ESR about 16...17 Ohms, but it didnt, it measures way to less and very unstable.
Because:
The ET4410 don“t know what we know, the tan phi according to the specs.
So how do the ET4410 determine the ESR...
And is it only a prob of this puppy ?
Maybe not...


mawyatt:
Thought you had a DE-5000? If so, how does it behave with these caps?

Best,

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