Products > Test Equipment
East Tester ET4410 ESR Measure
Martin72:
Man, it´s getting more and more difficult... ;)
Problems identifying sot23, is it a diode, a transistor...
Signal out path to the Hi-pot/cur socket was easy, but the way back....
6 pcs CMOS switcher circuits, several OPs, tons of resistors/caps...
It´s much more complicated than on DE5000, therefore it wonders me a little bit having the problems.
It´s a pity holidays are going to end, otherwise I can test on monday with the lcrs at work.
The Electrician:
--- Quote from: Martin72 on July 20, 2022, 10:25:55 pm ---Man, it´s getting more and more difficult... ;)
Problems identifying sot23, is it a diode, a transistor...
Signal out path to the Hi-pot/cur socket was easy, but the way back....
6 pcs CMOS switcher circuits, several OPs, tons of resistors/caps...
It´s much more complicated than on DE5000, therefore it wonders me a little bit having the problems.
It´s a pity holidays are going to end, otherwise I can test on monday with the lcrs at work.
--- End quote ---
Are you doing all this tracing circuitry in the ET4410 to try to figure out how it works?
To know how a particular meter calling itself an "LCR meter" works, only a few clues are needed. If it applies a sine wave to the DUT, which you showed the ET4410 does in reply #39, and if it allows the user to choose the frequency used to test the DUT, and if the frequency range covered is fairly large, then the method used is almost certainly the ones shown here: http://kripton2035.free.fr/LCR%20meters/lcr-theory.html
The commercial so-called "ESR meters" all (with one exception as far as I know, the Capacitor wizard) use pulse or square waves of 100 kHz (some DIY "ESR" meter projects may use a slightly different frequency, such as 40 kHz) . They don't allow the user to choose the frequency of measurement, and they can't make a measurement on a capacitor of less than about 1uF.
Martin72:
--- Quote ---Are you doing all this tracing circuitry in the ET4410 to try to figure out how it works?
--- End quote ---
Yes and no.
How it works I know, but I want to know more exactly to find out where the problem lies - And maybe "correct" it.
You can supply up to 2Vrms into the DUT, that´s way more the most LCRs offers and we´re talked about signal to noise ratio why the ESR thing "sucks".
Also you can change output resistance, bias level..The ET can do things other cheapos can´t and you probably got an idea why the ESR measure´s annoying me.
Some posts before, the ET measure the most things right and if it would "know" the tan-phi, it would display the ESR correct, because all other measured values are correct.
What the cap wizard concerns I agree that this is not a good example because of the fixed frequency which make comparisons useless under the 100khz and because the capacitor limitations.
mawyatt:
--- Quote from: Martin72 on July 20, 2022, 10:25:55 pm ---It´s much more complicated than on DE5000, therefore it wonders me a little bit having the problems.
--- End quote ---
Please remember the DE-5000 utilizes a highly integrated chip set, apparently the ET4410 doesn't. This chip set integrates much of the circuitry required to perform the LCR measurements, although don't know the details since we've never designed with this chip set.
Best,
Martin72:
I hoped someone come to argue this way.. :)
I know about the 2-Chipset on the DE (and other brands), chances are high that in the end there´s nothing really different except output and bias.
We´ll see.
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