Products > Test Equipment
East Tester ET4410 ESR Measure
The Electrician:
--- Quote from: TimFox on July 30, 2022, 08:22:14 pm ---When measuring such large capacitance values at such high frequencies, fixturing is critical to get an accurate result.
What exact fixture did you use on the DE-5000? (By the way, I would not trust the ESR value under these extreme conditions on my DE-5000.)
I find it perplexing how many people are concerned about accurate measurements of such ESR values; maximum values are normally more important.
--- End quote ---
The best that can be done with these handheld meters is to use the built-in four blade fixture. The point of my post was to show that there are other handhelds that can do much better than the DE5000 under certain conditions. The measurements the Tonghui and Applent got were within a few percent of the Hioki's result, unlike the DE5000's result. But, of course they cost several times what the DE5000 cost.
100 kHz isn't such a high frequency for this measurement.
Martin72:
--- Quote from: TimFox on July 30, 2022, 09:11:56 pm ---You cheated by reading the datasheet.
It's like affecting a physical situation by doing a measurement.
--- End quote ---
Me ?
Please explain why. :)
The Electrician:
--- Quote from: Martin72 on July 30, 2022, 08:46:44 pm ---
--- Quote ---If I measure it with the DE5000 at 100 kHz, the capacitance value is OL, the ESR value is ------, a bunch of dashes. However, if I set the DE5000 to measure Rs, I get a value of .014, not .0065 as it should be, but at least it gets something.
--- End quote ---
Doesn´t wonder me, the chipset the DE5000 use did not specify 100Khz as a testfrequency for such a "large" value.
In the 2000µF range, max. 1khz.
--- End quote ---
I wasn't expecting the DE5000 to get a good value for the capacitance. I only mentioned what the DE5000 got for the capacitance of the 1800 uF cap (which was OL) to compare it to what other meters get. The other meters got a negative value which shows that 100 kHz is above the self resonant frequency; but they didn't just give up and say OL.
What I want an LCR meter to do is be able to measure the ESR of a large capacitance at 100 kHz. This shouldn't be a difficult measurement due to a low value of D (high Q). Switching the DE5000 from capacitance measuring mode to the Rs measuring mode at least gives a value which is substantially in error.
Another thread from some time ago did some tests that showed that the DE5000 has difficulty making measurements when the voltage across the DUT is about 4 millivolts or less, which can be the case when measuring capacitors of this size capacitance. That appears to be the case here. But the Tonghui and Applent don't have that limitation.
Martin72:
--- Quote ---but they didn't just give up and say OL.
--- End quote ---
Hmm..What will be "better", don´t "giving up" and display anything or show clearly it´s not the range I can measure something like this...
The smart way would be to "obey" frequencies above(E.g., at 2000µF range testfrequencies up to 1khz max are possible), but this would require a manual mode which the DE5000 and many others don´t got.
The Electrician:
--- Quote from: Martin72 on July 30, 2022, 10:57:04 pm ---
--- Quote ---but they didn't just give up and say OL.
--- End quote ---
Hmm..What will be "better", don´t "giving up" and display anything or show clearly it´s not the range I can measure something like this...
Did you not see the emoticon following that sentence ( :--)?
The smart way would be to "obey" frequencies above(E.g., at 2000µF range testfrequencies up to 1khz max are possible), but this would require a manual mode which the DE5000 and many others don´t got.
--- End quote ---
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