MESR-100 V2 review and test
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- เผยแพร่เมื่อ 1 ต.ค. 2022
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Camera desk stand: amzn.to/3LAnppc Finally decided to get a dedicated ESR meter, as I was sick of the DROK transistor tester trying to do it. Bought this MESR-100 V2 off Amazon, and now I have tested it over a couple of days.
Here is an honest review.
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Got one a couple of years ago and when you get used to it ,its excellent. Very cheap and dependable.
Great tutorial. You can also test the resistance and microhenries of the inductors with the esr meter. The reactance formula is 2𝛑FL. That would be 2 x Pi x frequency of esr meter x 100 (uH) Just plug it in.
R=0.628 X L(uH)
L(uH)=R(ohms)/0.628
I have seen quite a few videos now about the MESR-100, and how "reliable", "accurate", etc; it supposedly is. But in all of those instances, the person doing the video never compares the MESR-100's readings to another ESR meter, so those assertions are baseless assumptions....the user has no idea if the ESR readings are accurate or not.
I have briefly owned one of these MESR-100 meters, and I also own three other models of digital ones (all more expensive/capable than this one), and I compared the ESR readings they gave for a variety of different capacitor types, capacitances, and conditions (brand new, used but probably OK, almost certainly bad, etc). I have to report that the MESR-100 gave readings 'in the ballpark' with the other meters in cases of lower capacitances, but for caps into the higher hundreds of uF and higher, it gave ESR readings nearly an order of magnitude from what my other meters gave for the same capacitors. Yes, I repeatedly re-zeroed the meter, yes, I made sure that the other meters were all using the same 100kHz test signal as this one does.
The MESR-100 is supposed to test using a sine wave, but when I used a high impedance oscilloscope to measure the signal, it was more like a slightly rounded square wave (yes, I understand that the extra 'scope probe leads and impedance can throw off the ESR meter's readings...but I did these tests with an out-of-circuit resistor instead of a capacitor, and was not even looking at the ESR readings while I was using the 'scope).
I returned my MESR-100 to Amazon for a refund, and did not get another to see if it had the same great inaccuracy with larger caps.
It is also important to test capacitors at an appropriate frequency for their type, etc. Many larger caps, for example from large linear power supplies, will either cause this meter to give a very inaccurate reading, or no reading at all, and that is because those caps were not designed to be used at such high frequencies as 100kHz like this meter uses (100kHz is indeed the 'industry standard' test frequency for so-called "low ESR" capacitors of the types designed for use in switching power supplies and such); better ESR meters will allow testing at at least one lower frequency, anywhere from 100Hz to 1kHz.
But all my other ESR meters ALSO measure DCR, and as that is an important companion measurement to ESR, and this meter does not measure DCR, I did not think it was worth it to get another one.
Thanks for the video, but curious, 5:35 220microf ESR should be
I called it not good, but not too bad either, and it's above the threshold for what should be replaced 😉
Hey mate, Rico here,
I've bought this ESR Meter it coming today.
Could you please give me your feedback after all the time you use it? Is it reliable on misurament?
Thanks mate.
Hey Rico,
Absolutely, it’s a great and reliable meter, but you have to make sure to use the right set of probes, if you’re not using the leads it came with. Wrong probes and you get measurements that are way off!
@@GeirAndersenRepairs Thanks mate!
Have you a link for probes different and more practical than what you get with the unit?
Thanks mate
Gday
I bought a cheap pair of general probes, then modified the length of them myself in order to get the right reading. It’s just trial and error, but using the zeroing function is key!
hello.I have purchased MESR-100 V2,and I tried to use two probe of analogue multimeter.But When I connect these probe to MESR-100 and pushing zero button while contacting with each probe,It displays "ERROR ZEROING ZEROING NEED TO SHORT TEST LEAD OR LEADS ARE TOO LONG".What probe should I purchase which is possible to use in the MESR-100 like your youtube video?
Unfortunately, I don't know of any probes that will work out of the box. I just used a set I had laying around, the progressively shortened the, until I was able to zero it. Required a fair bit of testing, shortening, resoldering, testing again, to make it work 👍
I thought you had to match the polarity neg. lead to neg side of the cap . ??
When measuring ESR polarity doesn't matter 😉
Some reviewers of this meter report issues, "Unable to Zero..Leads too Long"...??
Yep, if you try using stock generic probes from a cheap'o meter, it will fail to zero, due to resistance in the probes. I made my own probes from a middle tier meter and gradually shortening them until I got a successful zeroing and reading 👍
just replace all electrolyte cap,,
Geir, I have a question
If you don't know the value of the capacitor on the circuit board under test then how would you know the specified esr value for it?
Well, either get your hands on the schematic or board view. I have yet to find an electrolytic cap without specs written on it. Last ditch is to measure the cap with an LCR meter
@@GeirAndersenRepairs what about small smd caps though, they are never labeled. Why is it last ditch to use lcr meter?
If it’s in fact electrolytic capacitors, it will ALWAYS have markings, showing values. Only ceramic capacitors are “unmarked” and one would need schematics. LCR meters can measure inductance, capacitance and resistance (some also more measurements). A good quality (they are pretty expensive) LCR meter will tell you the actual value of the component. It’s rare that a 22uF capacitor is actually 22uF; There is a +/- tolerance.
To get an accurate measurement, the component would have to be removed from the board. Measuring in-circuit doesn’t give the correct reading (most times).
@@GeirAndersenRepairs So esr meter is useless at testing smd capacitor which is non electrolytic.
Well, you don’t really need to measure the ESR of non-electrolytic capacitors, because they’re VERY stable over a long time. Electrolytic capacitors though, they are very susceptible to increased ESR!
You can not use a long probe it affects the reading!
You can't use long probes, but you can use longer probes than the crap clip-leads that comes with the meter. I have made my own, by trial and error, and have found a length that works great and it's able to zero out 👍