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| East Tester ET4410 ESR Measure |
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| mawyatt:
--- Quote from: Kleinstein on July 06, 2022, 07:08:31 pm --- The resilts from Mawatt don't look reasonable - could be a calibration problem, or an extremely poor old MP capacitor with high loss. So even if the readings are stable this would not help as they are way off for a film capacitor - maybe an X7R THT part that looks like a film cap ?. --- End quote --- Don't think we have calibration problem, nor bad capacitors. All instruments calibrated and using an unused new stock WIMA Style Yellow 10nF film capacitor. Freq Hioki IM3536 with Kelvin Clips Tonghui TH2830 with Kelvin Clips DE-5000 with Alligator Clips 10KHz 9.99574nF with 15.5464 series R 9.99353nF with 15.6286 series R 10.007nF with 14.85 series R Best, |
| mawyatt:
Just a thought, can you use a lower output resistance than 100 ohms? Might help stabilize the ESR readings. Edit: Also try a higher drive voltage if you can change this. Best, |
| Martin72:
Hi, Can do, will do.. Martin |
| TimFox:
--- Quote from: mawyatt on July 06, 2022, 01:01:17 pm ---Might be an issue with that particular instrument, or the actual design. We just measured a cheap 10nF film cap with the DE-5000 and get reasonably stable ESR readings at 1KHz, 10KHz and 100KHz after a few seconds. 9.9944nF 61.6 Ohms @ 1KHz 9.877nF 9.48 Ohms @ 10KHz 9.710nF 2.16 Ohms @ 100KHz Also should add, these type instruments measure the magnitude and phase of the Voltage across the DUT and the Current thru the DUT, then compute the Capacitance and Series Resistance, so believe the ESR is not directly measured but computed. Best, --- End quote --- I believe that this type of instrument, evolved from the classic G-R Digibridge, measure the in-phase (“real part”) and phase-quadrature (“imaginary part”) of the voltage across the DUT, phase reference from the drive voltage (or the current through the DUT?) and divide by the device current to get the real and imaginary components of the DUT’s (complex) impedance, so the ESR is determined reasonably directly, rather than from the sine of a small angle. |
| Martin72:
--- Quote ---Will test it further with all the caps I can find here...in the next days.. --- End quote --- You will always get stable values when testing electrolytic capacitors and always "unstable" vaues when testing foil-caps... No, not at all. There is a trend to watch, by many of my foilcaps (MKP, FKP) the ET4410 reads a phase of -90° exactly or really near by (89.95..99). I got some MKT (audio crossover purposes), it´s the same thing but they have losses when using measure frequencies from 10Khz on. Then the phase lowers slightly down to say -88...-89° and the ESR value becomes stable. All electrolytics here got a phase of -72...-87° and the ESR value is stable. Martin |
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