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LCR meter opinion
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nctnico:

--- Quote from: ogden on January 29, 2022, 07:19:52 pm ---
--- Quote from: nctnico on January 29, 2022, 06:53:53 pm ---I'm following your lead. You came up with 'assured performance' which I countered with the hint that you'll need to use a component that is fit for purpose anyway. But maybe you missed that hint.

--- End quote ---

What would "if you want *assured* performance at higher frequency than your capacitor specified at, you are using wrong component" mean, huh? Whatever you are smoking - you shall consider to quit.

--- End quote ---
Did you ever see a capacitor specification / datasheet stating a maximum operating frequency? IMHO you are mis-interpreting capacitor datasheets by mistaken datapoints for operational limits.
ogden:

--- Quote from: nctnico on January 29, 2022, 07:30:23 pm ---Did you ever see a capacitor specification / datasheet stating a maximum operating frequency? IMHO you are mis-interpreting capacitor datasheets by mistaken datapoints for operational limits.

--- End quote ---
Specified at particular frequency does not mean it is maximum operating frequency. Are you OK?
nctnico:

--- Quote from: ogden on January 29, 2022, 07:33:32 pm ---
--- Quote from: nctnico on January 29, 2022, 07:30:23 pm ---Did you ever see a capacitor specification / datasheet stating a maximum operating frequency? IMHO you are mis-interpreting capacitor datasheets by mistaken datapoints for operational limits.

--- End quote ---
Specified at particular frequency does not mean it is maximum operating frequency. Are you OK?

--- End quote ---
You are contradicting yourself again. At one hand you say assured performance based on data points in a datasheet are not to be exceeded (no guarantees beyond that) and on the hand point your are claiming that it is fine to use a capacitor at any frequency. What is it? Make up your mind!
ogden:

--- Quote from: nctnico on January 29, 2022, 07:34:23 pm ---
--- Quote from: ogden on January 29, 2022, 07:33:32 pm ---
--- Quote from: nctnico on January 29, 2022, 07:30:23 pm ---Did you ever see a capacitor specification / datasheet stating a maximum operating frequency? IMHO you are mis-interpreting capacitor datasheets by mistaken datapoints for operational limits.

--- End quote ---
Specified at particular frequency does not mean it is maximum operating frequency. Are you OK?

--- End quote ---
You are contradicting yourself again. At one hand you say assured performance based on data points in a datasheet are not to be exceeded (no guarantees beyond that) and on the hand point your are claiming that it is fine to use a capacitor at any frequency. What is it? Make up your mind!

--- End quote ---

I was saying: you *can* use component at ANY frequency, yet if you want assured performance at specified frequency - you better have specification for it. I am explaining this like third time here  :palm:

[edit] I also said: "Specified at some frequency does not mean it can't be used or won't work at higher frequencies. ".  Explaining in your terms: No guarantees beyond data points in datasheet does not mean one can't use part beyond that, just performance won't be assured. Comprehend?
Martin72:

--- Quote from: nctnico on January 29, 2022, 07:05:44 pm ---Before taking any more measurements: check the Kelvin clips and connectors for damage and do an open / short offset calibration after changing the measurement frequency.

--- End quote ---

I think I know what I´m doing since 22yrs, but thank you for the advices.


--- Quote ---You should not get any readings which exceed the LCR meter's accuracy specification with those capacitors.
--- End quote ---

This was already proved, at 1 and 10khz you get results which are very familar in comparison with the two other LCRs.
At 100khz it´s drifting a little bit, but it´s still in the specs of every LCR.
What the displaying capacitance value concerns.
But that wasn´t the point in this thread.
Mainpoint starts with the statement of a user, after several recommendations to go for the DE5000, that this LCR is a good one, but have problems on 100khz.
The "problem" turned out to be a probably wrong display of the D-factor in the 100Khz range.
This is irrelevant in more ways than one, but it does give the impression that the LCR has a flaw.
Yes, in theory it is -BTW, I found out, that the U1733C got this too.
But in practice...
Point one:
You won´t measure µF caps with 100khz - why should you.
Point two and most important:
The resolution of the D-factor display itself.
"0.001" - If you exclude the basic digit errors, this would be the highest resolution.
0.001 or 1x10-³...
This resolution is useless for foilcaps.
So if the LCR shows "nonsense" at 100khz or "0.000", it´s the same:
You can´t see the real value.
Same when you use lower testfrequencies, the usually ones for foil caps in µf-range, 1 or 10khz.
You´ll see "0.000" or "0.001"
Therefore it is a problem in theory, not a real one which can stop you buying the DE5000.
Displaying the capacitive value was never the issue here.
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