MESR-100 In-Circuit ESR Meter: An aborted product investigation

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I bought this popular, inexpensive ESR meter, the MESR-100, from Amazon, with the goal of evaluating it as the subject of a RU-vid documentary.
But as this video shows, I was not impressed by its value and performance, and thought that it was something of an unreliable dud. I have no idea if mine was defective or not, or if it is just a poor design. Anyway, if you are in the market for an ESR meter, I think you can do better than this model for about the same price. Compare this product's performance and capabilities with the EZM Electronics Studio's "ESR-2501C" in my video about that product. It easily outperformed THIS meter, and also has a useful DCR measuring feature. It's ESR readings were consistently in line with the ESR reading obtained form my EXTECH LCR200 meter, and THAT product can only barely test DCR of capacitors. I have returned this product to Amazon.

Опубликовано:

25 сен 2024

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Комментарии : 11

@DavidChow-n4x 5 месяцев назад

I can’t stand it. If the product is made in China, the instruction for the product is on a small piece of paper and the typeface is so small I have to take a picture of the instructions and enlarge the directions on my iPhone just to be able to read it. 😡🤬 And you are right it not in English it “Chop Suey English.” And I am Chinese America and I still don’t understand “Chop Suey English.” I am not into electronics but I do enjoy your explanation. You have a great voice for radio. Take care see you on the next vlog. 🙏🙏🙏

@guateque1718 27 дней назад

I ordered the Ezm 2501C to replace my Mesr100. It had incorrect readings just like shown in this video. Turns out one of the Mesr100 leads was faulty. It works as it should now but its short leads make the ezm 2501C the winner by a country mile.

@campbellmorrison8540 2 месяца назад

I have one of these and its proved very useful for the price I thought. I'm struggling to understand why you are so disappointed with it and yet happy to muck around with that EXtech that cant even read the capacitance. The only annoying thing I find is the short leads but I accept thats how it has to be at 100Khz. I dont see a down side of not measuring DCR surely a multimeter would suffice for that.

@youtuuba 2 месяца назад

Campbell Morrison, I explained why I found this unit to be inadequate. And I don't know why you think the Extech LCR meter can't read capacitance. Because you seem to think that a simple multimeter is a substitute for a proper tester, I guess you will continue to struggle to understand my meaning.

@campbellmorrison8540 2 месяца назад

@@youtuuba fair enough I'll watch it again I may have got the wrong end of your Extech LCR meter. PS I was only suggesting a multimeter for the DC test not ESR or even capacitance. Personally I also like to check the leakage at the rated voltage also for which I use a variable PSU and multimeter as this is not done with any general capacitance instrument Im aware of or can afford.

@marka1986 5 месяцев назад

That meter is probably "good enough" for general service work to weed out caps that have seriously deteriorated. I used the analog meter based on the creative electronics LM324 circuit. That didn't have nearly the resolution as this but helped fixed many tvs. That circuit sort of generated what looked like a sine wave because the oscillator was 1 section of the 324 and it's slew rate was so poor it looked closer to a crummy sine wave. I can see why you might want to return it though for the price. Looks like about 60 bucks as of April 2024.

@youtuuba 5 месяцев назад

Marka, yes this meter costs around $60-$70 from Amazon. The other small ESR meter I showed costs only about $40 from the eBay seller, has a better display, better test leads, more accurate measurements, and also tests capacitive DCR, which not even the EXTECH meter I showed can do properly; I think it is a much better value than the MESR product; it's downside is that there are important things to know to use it correctly, and it comes with no documentation; this is why I made RU-vid video user's manual for it, as well as a downloadable user's manual and a Quick Start Guide, the location if which is shown in that video. I would caution anyone about thinking this MESR model is "good enough" for casual electronics repair. It's only purpose is to provide good/bad information on capacitors, but at least on mine, some ESR readings were off by nearly an order of magnitude, which can make a good capacitor look bad, and vice versa. Also, because it cannot measure DCR, it can easily lead its user into NOT replacing capacitors which have awful DCR but acceptable ESR (which often happens).

@biogons14 Месяц назад

@@youtuuba The EXTECH model can´t be used "in circuit" because of the voltage of the square wave used; over 0.6 volts.

@youtuuba 27 дней назад

@@biogons14 , yes, but I was not comparing the EXTECH to the MESR. I was comparing the MESR to the other ESR/DCR tester that I had also made a video and, as well as written a downloadable manual for it. The only reason I had the EXTECH meter in this video was for a 'third opinion', with a readout I could easily get in the workbench shots. I also own and have ready access to higher end ESR/DCR meters, and with the exception of the EXTECH not being good at measuring capacitive DCR, its ESR readings are very close to what the higher end meters I tried were showing.