| Products > Test Equipment |
| East Tester ET4410 ESR Measure |
| << < (16/33) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |
| Previous page |