Electronics > Projects, Designs, and Technical Stuff
ESR meter
kripton2035:
yes it is 4-wires measurements
and for the TL-22:
nanofrog:
--- Quote from: Svgeesus on January 13, 2018, 04:53:59 pm ---That meter says that it does 4-wire measurement, yet the photo shows only three connectors, one of which is for a shield. Are the other two special two-wire connectors with force and sense on the same plug?
--- End quote ---
The portion of the test fixtures that plug into the DE-5000 use a double sided PCB. So you've test on one side, sense on the other (true 4 wire). The round hole is for a guard/ground line (if you choose/need to use it).
The one drawback to the other end of the fixtures, is the alligator clips or tweezers terminate the sense and test signals before reaching the CUT. Given the distances are small (~1 - 1.5"), it's not going to make that much of a difference in practice generally speaking.
But if you truly want 4 wire all the way down to the component leads, then you can disassemble an alligator clip fixture (TL-21) and add your own wire and clips (i.e. those that the halves are insulated from one another, such as a Mueller BU-78K or similar). And ~$22, it's not horribly expensive either.
Ideally, I'd recommend just adding 4* BNC connectors instead of wires just coming out of it, or even using banana's (better than raw wire though as strain relief through the plastic fixture enclosure isn't an issue). That way you can just connect up true Kelvin clips or a pair of tweezers that stay isolated all the way down to the CUT. :-+
It'd be a bit more difficult with the tweezers (TL-22), but quite doable (PCB material would be one way). that would accomplish this, and inexpensively as well. The Kelvin clips can easily out-cost the fixture (there seems to be some decent ones available on eBay and Aliexpress that are much less expensive than the Mueller's linked above).
Edit: Krypton2035 beat me to it. 8)
tigr:
--- Quote from: The Electrician on January 13, 2018, 03:42:24 pm ---tigr, your posts would be much more useful if you would add more text describing what the pictures you post are illustrating.
--- End quote ---
This is for another topic. Here we are talking about a simple ESR meter at 100kHz.
Yesterday, one device was repaired and decided to test two capacitors in parallel. It turned out not to be a simple task. However, I came to the conclusion that both capacitors are normal.
2x2200uF/50v ESR-0,004Ohm.
This, it seems to me, is one of the variants of the solution for checking the capacitors connected in parallel.
The Electrician:
--- Quote from: tigr on January 13, 2018, 06:29:21 pm ---
--- Quote from: The Electrician on January 13, 2018, 03:42:24 pm ---tigr, your posts would be much more useful if you would add more text describing what the pictures you post are illustrating.
--- End quote ---
This is for another topic. Here we are talking about a simple ESR meter at 100kHz.
Yesterday, one device was repaired and decided to test two capacitors in parallel. It turned out not to be a simple task. However, I came to the conclusion that both capacitors are normal.
2x2200uF/50v ESR-0,004Ohm.
This, it seems to me, is one of the variants of the solution for checking the capacitors connected in parallel.
--- End quote ---
You have added more text and this is a good thing. But what you have said arouses our curiosity, so try to go further.
Tell us WHY it was not a simple task. Then tell us how you solved the problem. Tell us what the other variants for checking capacitors in parallel are, and why they didn't work.
tigr:
--- Quote from: The Electrician on January 13, 2018, 08:15:47 pm --- Tell us what the other variants for checking capacitors in parallel are, and why they didn't work.
--- End quote ---
This I would like to hear from many of you who have tons of different equipment of the first and highest category.
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