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Best ESR meter for in-circuit (even if it is not accurate)

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Veteran68:

--- Quote from: kripton2035 on August 30, 2023, 06:50:44 pm ---
--- Quote ---As I recall the highest-end Uni-T 622
--- End quote ---
the datasheet says "only" 0.1V 0.3V or 1V
https://static.eleshop.nl/mage/media/downloads/UT622Datesheet.pdf

--- End quote ---

My bad, apparently my recollection was wrong. However the East Tester ET433 does support 10mV-1.1V in 1mV increments.

u666sa:
Believe it or not, it is Hantek 1833C, it has test voltage 300 mv and 600 mv, and more frequencies than any other LCR meter, 100Hz, 120Hz, 400Hz, 1kHz, 4kHz, 10kHz, 40kHz, 50kHz, 75kHz, 100kHz. Plus it's cheap. On ali right now it is 12000 rubles, just around $125. Plus it has 3 speed modes, fast, medium and slow. It's a fast meter with rechargable batteries that last you long time.

CEM meter cost just as much but it is slow.

DER does its job well, but has less frequencies and costs a lot of money.

Veteran68:
At USD prices the Hantek 1833C and DE-5000 cost around the same ~$140. I chose the 1833C over the DE-5000 not so much for functionality improvements (I don't think I'll ever use ALL of those extra frequencies) though I do use the different test voltages, and do wish it had an even-lower 100mv test range to avoid issues with in-circuit Schottkies. My main concern with the DE-5000 was the poor UX that many people described. The UI+UX of the Hantek is quite good IMO and I'm happy with it.

If I were buying another handheld in the <$300 range I'd probably go with the Uni-T 622E or ET433 to get the additional test voltage capability. But likely my next LCR meter will be a bench model.

TimFox:
I have done measurements on capacitors installed in relatively simple circuits by exploiting the guard terminal on my DE-5000, and on bench instruments at work.
Done properly, the guard terminal removes the current through external components, measuring only that through the capacitor under test, but that can be hard to implement on more complicated circuits.

timeandfrequency:
Hi RiRaRi,
You may check out this one.
Performs in-circuit measurements (DUT power must be off) and is easy to use. Rather expensive, but it's a reliable gear.

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