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East Tester ET4410 ESR Measure

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Martin72:
Therefore I said not again... ::) :P
We can discuss about in one of the DE5000 threads, here it´s off-topic.

indman:
Then eliminate the mention of the DE-5000 from every 2nd post in this thread and ban others from mentioning it in comparative measurements! What difference does it make what is the name of the LCR measuring device if we are discussing the principle of its operation? We speak different languages, alas. ;)

Martin72:
Meanwhile I´ve "studied" some methods of ESR measuring....interesting.  ;)
This brings me to the point to know how the ET4410 measures ESR and why it´s so "bouncing".
Last can depend on the noise, no, better, will depend.
Therefore I begin to draw a schematic for the ET4410, starting with the output stage.
Maybe on this way I find also a "solution" also for the famous DE 5000 and can make people happy, who are expecting everything from a 100 bucks instrument like having one for 1000 or more.


The Electrician:

--- Quote from: Martin72 on July 18, 2022, 11:12:04 pm ---Meanwhile I´ve "studied" some methods of ESR measuring....interesting.  ;)
This brings me to the point to know how the ET4410 measures ESR and why it´s so "bouncing".
Last can depend on the noise, no, better, will depend.
Therefore I begin to draw a schematic for the ET4410, starting with the output stage.
Maybe on this way I find also a "solution" also for the famous DE 5000 and can make people happy, who are expecting everything from a 100 bucks instrument like having one for 1000 or more.

--- End quote ---
The phrase "methods of ESR measuring" spans several kinds of instruments.

Meters designated "ESR meter" are very specialized and generally only measure the ESR of capacitors at 100 kHz, and typically electrolytic capacitors of more than 1 uF.  They can't measure inductance, or ESR at frequencies other than (typically) 100 kHz.  For information on those types of meters see this website:
http://kripton2035.free.fr/esr-repository.html

Meters designated "LCR meter" or "impedance analyzer", if they are  modern digital instruments, make measurements using the methods described here: http://kripton2035.free.fr/LCR%20meters/lcr-theory.html
There is more information on these meters here: http://kripton2035.free.fr/lcr-repository.html
Within this repository there is info on so-called "LC meters" which use yet another technique.

Your ET4410 is a full-fledged "LCR meter" and the reason for the "bouncing" ESR reading is what I already explained in reply #20.  Even though it is low cost, the DE5000 uses the same technique described in the references in: http://kripton2035.free.fr/LCR%20meters/lcr-theory.html, and its limitations are mainly due to signal to noise ratio.

Martin72:
Thanks. :-+
Nevertheless I want to try it out making a schematic, today I finished the output stage.
(Resistor values are not correct, except the output)

Edit: Added signals from PA4 and PA5 of the controller.

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