Products > Test Equipment
East Tester ET4410 ESR Measure
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mawyatt:
Any quality somewhat larger value Polystyrene cap should suffice for experimenting and duplicating the high "Q" issue with ESR.

Here's an surplus example from TRW:

https://www.surplussales.com/Capacitors/Poly-Unelco.html

Best,
indman:
mawyatt,it's not a secret to me. I wanted to find out the marking of the capacitor that measured The Electrician :)
Martin72:

--- Quote from: Martin72 on July 25, 2022, 08:48:49 pm ---In the next days I´ll measure a electrolytic cap on all the three, if there are remarkable differences between them.

--- End quote ---

Today a electrolytic cap on my ET4410, same cap then on monday with the lcrs on work.
It´s a low esr type from panasonic, 100µF/35V.

Results with 120hz, 1Vrms, series:

C: 102.96µF
Xc : -12.882 Ohm
D: 0.0208
Q: 47.388
Phase: -88.79°
ESR: 0.2699 Ohm (stable.. ;) )

So far, so good, everything seems plausible, you can take the values and calculate, everything is coherant.
But I´ve choose this type of cap, because a spec sheet is avaible.
And the sheet "says" at 120Hz the D-factor will be 0.12 for the 35V type....
Of course there are tolerances, but appx 6-times less..
I trust the value in the spec more than the measure.
Taking the D-factor from the spec, taking 100µF, calculations are Xc -13.26 Ohm, Q 8.33, ESR appx 1.59 Ohm
The measured Xc seems plausible, so why are D and Q so different..
I think it got to do with the here already mentioned signal to noise ratio.
Actually I read the very good keysight handbook, makes things clearer for me - Thanks for the hint !



TimFox:
Normally, the specified D value on a data sheet is a maximum, not a "bogie" value.  Was there a percent tolerance indicated on the data sheet?
I would look it up myself, but you didn't state a Panasonic part number.
Martin72:
As far as I can see not for the tan-phi.
But maybe you see more:
https://cdn-reichelt.de/documents/datenblatt/B300/EEUFR_ENG_TDS.pdf

A few minutes ago I doubled the output voltage to 2Vrms, no effect.
Same when using the mode with 1.5V bias.

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