ESR measurements Capacitors

[Arno Pf]

Redesigned my crossover and took out the duelund which has to be replaced by a new capacitor of a lower value. So before spending a fortune on capacitor-looks (only) I figured to compare some of the caps that I had laying around but now via measurements. I also do comparative AB relay switched listening tests but these are not included in this run.
Got a reasonably priced Capacitance/ESR/D/Q meter (PeakTech 2170, calibrated before the measurements), that would at least be good for comparative measurements since I could not find sufficient specs/data on the net (Only a lot of statements like "Very low ESR, Lower ESR" etc)

I was surprised by duelund......

 

[Arno Pf]

Lost the attachments in the previous message:

 

[JonSnell Electronic]

The figures probably are understandable to you but what are they. Ohms, Milli-Ohms or leakage current in micro Amps?

 

[Arno Pf]

Indeed, perhaps this helps a bit: Equivalent series resistance - Wikipedia
The ESR is in Ohms by the way

 

[wolf_teeth]

We need to know what your charts are showing. It only tells us Frequency and cap under test. There is no label for the numbers you measured or what they are.

Later,
Wolf

 

[Arno Pf]

Wolf, please see my previous addition ESR is Ohms (Equivalent Series Resistance). Q is always only a factor from Xc/R. Standard electronics stuff I assumed (I know assumption is always a poor thing)

 

[wolf_teeth]

Yes- I know what those are in terms of representations and specs.

I don't know what values measured are ESR or whatever as you have no labels to show which measurement is which. Both images are labeled as ESR, which clearly they are not.

Later,
Wolf

 

[Arno Pf]

Top left corner shows ESR in one table and Q in the other. Maybe I am not getting the confusion here

 

[PRR]

> Both images are labeled as ESR, which clearly they are not.

 

[wolf_teeth]

Now I see it. Thank you! Apparently, I'm just blind.

Wolf

 

[PRR]

> I'm just blind.

It took much of a day for me to catch-on; and another day because I have a wicked head-cold and just can't care.

 

[ubergeeknz]

So the Mundorf acts for all intents and purposes as a "perfect" capacitor? That's something.

 

[wolf_teeth]

Well- the Mundorf ZN and the Duelund are the only Film/Foil caps in the bunch. Everything else is a metallized construction.

I see that the Mcap also has 0 for ESR. What I'm not understanding is why the ESR is null, as there is normally at least a little present.

Later,
Wolf

 

[ubergeeknz]

Well- the Mundorf ZN and the Duelund are the only Film/Foil caps in the bunch. Everything else is a metallized construction.

Interesting that the Duelund performs so poorly, 0.55Ω is electrolytic territory

 

[wolf_teeth]

But it's Q is vastly different than the rest as well.

Wolf

 

[ubergeeknz]

Quite, it's lower, which means it behaves less like an "ideal" capacitor.

Objectively, it is the worst performing capacitor tested by a fair margin.

Whether that matters in most applications is another question.

 

[Arno Pf]

Well- the Mundorf ZN and the Duelund are the only Film/Foil caps in the bunch. Everything else is a metallized construction.

I see that the Mcap also has 0 for ESR. What I'm not understanding is why the ESR is null, as there is normally at least a little present.

Later,
Wolf

The "0"ESR means that the value is below the measurement resolution

 

[Vovk Z]

I thought it is a device model name "Q PeakTech 2170".
So, as for me, I'll place "Q" up above Q-values, or, at lest, use string like "PeakTech 2170, Q"

 

[davidsrsb]

I interpret the high low frequency ESR at low frequencies of the Duelund as actually being serious parallel leakage.

 

[wolf_teeth]

Yes, I would not say the Duelund measures well at all. To the point of actually making sure the measured rolloff with its inclusion actually results like it should. I'd be worried that the highpass function under its use would not work as hoped or intended.

Later,
Wolf