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East Tester ET4410 ESR Measure
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The Electrician:
Martin72, do you have a link to a spec sheet for the Panasonic 1000 uF cap you measured in reply #103?

If not, do you know if it's a polymer capacitor, or some other type that would be exceptionally low loss?
MegaVolt:

--- Quote from: The Electrician on July 31, 2022, 11:10:40 pm ---Here are a couple of plots vs frequency of parameters of a 1000uF 16v Rubycon capacitor.
--- End quote ---
With what device these wonderful graphs were taken?
The Electrician:
This: https://www.hioki.com/us-en/products/lcr-meters/3-ghz/id_5772

Also Google this: IM3570E14-23M.pdf
mawyatt:
For those of us without a nice Hioki IM3570 we can generate some decent plots of DUT Capacitance Impedance Magnitude and Phase with a scope and signal generator. Simply sweeping the source frequency over the desired range and measuring the amplitude and phase of the voltage across across the DUT and current thru the can yield the result with a little math.

Z = V/I (Magnitude and Phase), where V is voltage across the DUT and I is the current thru the DUT which can be measured by inserting a known resistor R in the signal path to the DUT. Then the DUT current is Voltage across the resistor divided by R.

If you have a modern DSO like the Siglent SDS2104X+ which has a built-in Bode function you can employ this to make the nice plots directly on the screen in dB magnitude and phase of Cap DUT Z vs. frequency.

If folks are interested we could start another thread on this technique, so as not to dilute this thread.

Anyway, here's a plot of a 1000uF 16V electrolytic capacitor, another 10uF, 680uF and 100uF. The scale is in dB 1000 ohms and phase is in degrees.

Best,
Martin72:
So...
Today I´ve measured the both panasonic caps at work again, the menu of the ST2830 is not the clearest one.
A few minutes ago I did the same again at home on the ET4410, to have it all in one post.

The 100µ cap at 120Hz:

ST2830                  ET4410
103.16µF               103.33µF
Xc -12.86 Ohm      -12.84 Ohm
Q 51.10                  51.80
D 0.0196                0.0192
ESR  0.252 Ohm      0.250 Ohm
Phase -88.88°          -88.89°

At 100Khz:

26.50µF                  15.40µF
-0.071  Ohm            -0.104 Ohm
1.607                      2.427
0.6185                    0.4115
0.038 Ohm              0.043 Ohm
-57.86°                   -67.63°

1000µF at 120Hz

ST2830                  ET4410
945.91µF                946.8µF
Xc -1.402 Ohm       -1.401 Ohm
Q 28.60                  29.04
D 0.035                  0.035
ESR 0.049 Ohm       0.048 Ohm
Phase -87.99°         -88.03°

At 100Khz

72.50µF                  23.80µF
-0.025 Ohm             -0.067 Ohm
1.578                      3.756
0.632                      0.266
0.014 Ohm              0.018 Ohm
-57.31°                  -75.20°

At 120Hz they are like twins.. 8)

Datasheets:
1000µF/25V FM Type:
https://www.micro-semiconductor.com/datasheet/37-EEU-FM1E331LB.pdf

100µF/35V FR Type:
https://industrial.panasonic.com/cdbs/www-data/pdf/RDF0000/ABA0000C1259.pdf
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