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East Tester ET4410 ESR Measure

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Martin72:

--- Quote from: The Electrician on July 14, 2022, 11:57:35 pm ---The measurement is stable with electrolytics because they are lossy; their D is never going to be as low as .001, or even close to that.

--- End quote ---

Yap, see https://www.eevblog.com/forum/testgear/east-tester-et4410-esr-measure/msg4297858/#msg4297858

mawyatt:
Likely our ESR readings are also stable due to capacitor loss. These cheap film types we have are nowhere near the Q of the Silver Mica or Polystyrene types. Here's what the Tonghui TH2830 and Hioki IM3536 show at 10KHz for a 10nF cheap film type.

Best,

TimFox:
A comparison of results with my DE-5000 using a home-built four-terminal sense of two binding posts (0.75 in spacing).
DUT:  SBE 715 (now CDE), 10 nF/5%/600 V film-foil polypropylene ("orange drop") radial leads.
Test mode:  series capacitance Cs
Manufacturer's spec:  Q > 3400 at 20 kHz, Q > 2500 at 100 kHz.

100 Hz:  9.932 nF  Q = "OL"  ESR cycles from 10 to 130 ohms
120 Hz:  9.929 nF  Q = "OL"  ESR cycles from 5 to 56 ohms
1 kHz:    9.927 nF  Q = "OL"  ESR cycles from 0.02 to 0.3 ohms
10 kHz:  9.925 nF  Q = "OL"  ESR stable at 0.01 ohms
100 kHz: 9.921 nF  Q = 1911  ESR stable at 0.08 ohms

The "cycling" ESR behaves like a relaxation oscillation between the limits.
The last (finite) Q display settled to that value after maybe a dozen readings.
The stable ESR values settled after only a few readings.
Obviously, this high-Q part is at the limit of loss reading for this meter.
Phase angle is always 90.0 deg.

indman:

--- Quote from: The Electrician on July 14, 2022, 11:43:53 pm ---I measured the silver mica cap from reply #20 on my DE5000.  Here's what I got.
At 1 kHz, the value of the cap is good. D is 0.000, Q is OL, ESR is 1.86
At 10 kHz, the value of the cap is correct.  D is 0.000, Q is OL, ESR is 0.18  :-- |O
I found a 10 nF polystyrene capacitor and measured it with the Hioki IM3570:

--- End quote ---

Now I'm starting to understand why the DE-5000 can't correctly measure high quality film capacitors at different frequencies. Can you measure similar capacitors on your Hioki IM3570 and confirm my findings in this thread?
https://www.eevblog.com/forum/testgear/any-one-mod-the-de-5000-for-1mhz-frequency/msg2676075/#msg2676075

Martin72:
Come on, not again...

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