MESTEK DM91A CHEAP-O Multimeter Review & Teardown!

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  • เผยแพร่เมื่อ 19 ก.ย. 2024

ความคิดเห็น • 98

  • @RapttorX
    @RapttorX 5 ปีที่แล้ว +2

    someone had a lot of fun while editing this :)

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      It's TRUE! I try to make multimeter videos enjoyable, I really love testing and using these guys and it usually ends up being a good time! Thx for watching

    • @aldrinelectronics4283
      @aldrinelectronics4283 3 ปีที่แล้ว

      @@KeepOnTesting DM100c pls revies & teardown tnx bro

    • @KeepOnTesting
      @KeepOnTesting  3 ปีที่แล้ว

      @@aldrinelectronics4283 Check out my RICHMETERS RM406B Review, same identical multimeter! th-cam.com/video/9nIhdrv2ylA/w-d-xo.html

  • @bFORCe2003
    @bFORCe2003 2 ปีที่แล้ว

    I bought this a couple of years ago and am satisfied with it, best of the cheapies if you ask me. Looks sturdy and more expensive than its price tag. I recommend it if you're looking for a cheapie.

    • @KeepOnTesting
      @KeepOnTesting  2 ปีที่แล้ว

      It's an all around solid multimeter, 👍 agreed.

  • @kokalti
    @kokalti 4 ปีที่แล้ว

    I like how you went into the internals. Great vid don't know why so many thumbs down

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว

      Thanks for watching! I appreciate the feedback 👍

  • @yambo59
    @yambo59 5 ปีที่แล้ว

    I forgot to add, on your intermittent live function, looks like your jack connections are soldered to the board ok in the video, does it act the same with different leads-? Maybe the lead jack sleeve needs to be pullled out of its hole and squeezed together a bit -? Im just guessing and after squeezing the sleeves together a bit I like to wrap a single turn of electrical tape around the outside of the lead jacks before slipping them back into their holes, they fit tighter in the holes and makes the leads fit nice and snug. Also fair warning, if you take this one apart all the way its got the PITA spring and ball bearing switch detents design along with a LED panel and backlight that are not screwed down to the board, so reassembly is a bit like surgery-lol I laid in a touch of grease to the ball bearing ramps before reassembly, works very smooth but still nice and solid. I finally got the combo down for reassembling it with much less frustration but it sure would be easier if the LED panel was screwed to the board instead of just laid into its recess . Let me know if you find out the issue - im curious to see what your problem is as mine works great. My VFC comes up after I hit the Hz button then the VFC button, the manual says it stands for "variable frequency voltage", Im guessing its something for measuring motors or-??? Overall I really like this little 10,000 count meter, its not perfect but what sub $20 meter is-? lol

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      Definately agree it's a very nice meter for the price. I'll be taking a closer look at it shortly and I'll give you an update if I can find what's causing the intermittent live problem, s you mentioned I'll try a new set of leads as well. Btw, thanks for your very informative replies, you seem like a very knowledgable meter aficionado and I appreciate your input. I'll be running the first contest soon for a free multimeter , should be fun. Stay tuned!

  • @yambo59
    @yambo59 5 ปีที่แล้ว +1

    Ive got one of these and like it quite a lot, not perfect for sure -- but one of the biggest things its 9999 count - true RMS, good capacitance range, nice big display, great looking rugged case and doesnt feel cheap - except for the leads - like most cheap meters. Yeah the continuity could be better, but even my Fluke 17B+ isnt what it could be as with many meters especially cheap ones. Ive seen far worse than this for same money. I like it overall even with its flaws.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      It's good value, flaws aside as you mentioned it does offer a lot. I just wish the continuity was better overall because this would have made it reside on my bench. Definitely much better than most "cheap" meters that's for sure!

    • @yambo59
      @yambo59 5 ปีที่แล้ว

      @@KeepOnTesting- Yeah and it aggravates me why so many meters even some better more costly ones have to have crappy continuity performance, either its intermittent and slow or the beep is weaker than heck or both. We went to the freakin moon 50 years ago so its not like something this simple should be costly to make happen. I have an Amprobe 520 thats a very high quality meter but its continuity function isnt even as good as my Aneng 8009 using the probemaster leads, in fact the Aneng with PM leads even beats my Fluke 17B+ with PM leads and dont think that doesnt irk me-lol

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      HaHa, Yes it's hard to believe isn't it. now we are getting ready to send man to mars but we can't get a continuity buzzer to work worth a damn... Sigh ;)
      I was surprised the Probe-master leads made no difference though, this was highly unusual.Oh well, lot's of other meters can carry that flag! Cheers..

    • @thebeststooge
      @thebeststooge 5 ปีที่แล้ว +1

      @Darren Walker What would you suggest for a meter that does all of this and has a fast continuity? I suspect the slow is because the processor is slow inside AND it has to think about the auto ranging. Still, I need a meter yesterday so what would you suggest that does all of this and has a fast continuity?

  • @TechnoWit3D
    @TechnoWit3D 3 ปีที่แล้ว

    Thanks for the review. Which one is best budget multimeter, according to your test?

    • @KeepOnTesting
      @KeepOnTesting  3 ปีที่แล้ว

      Hi Rafael, check out the Top Ten under the review description here: th-cam.com/video/wXjGgS3BRlY/w-d-xo.html

  • @lorencing
    @lorencing 2 ปีที่แล้ว

    Nice demo, thanks. When do you think one should buy this model over the DM100C? Is it worth buying the DM100C for the extra few euros/bucks?

    • @KeepOnTesting
      @KeepOnTesting  2 ปีที่แล้ว

      I would get the DM100C ..more features, more robust. Definitely worth the Xtra $

  • @slybunda
    @slybunda ปีที่แล้ว +1

    can you use rechargeable AAA batteries in this or is it not advisable?

  • @realmattez
    @realmattez 3 ปีที่แล้ว

    Thanks!

    • @realmattez
      @realmattez 3 ปีที่แล้ว

      I was looking for PDF user manual, but this video is more beneficial. Thanks a lot.

    • @KeepOnTesting
      @KeepOnTesting  3 ปีที่แล้ว

      Much appreciated! Glad the review helped.
      Keep On Testing 😀👍

  • @bloguetronica
    @bloguetronica 5 ปีที่แล้ว

    Very nice video! Subscribed.

  • @slybunda
    @slybunda ปีที่แล้ว +1

    want this just for capacitor testing.

    • @KeepOnTesting
      @KeepOnTesting  ปีที่แล้ว +1

      👍Will be great for that !

    • @slybunda
      @slybunda ปีที่แล้ว +1

      @@KeepOnTesting excellent i have just ordered one for £9 thats like $11 inc delivery!!!!!

    • @KeepOnTesting
      @KeepOnTesting  ปีที่แล้ว +1

      @@slybunda wow..Great price! Let us know how you like it 😀

    • @slybunda
      @slybunda ปีที่แล้ว +1

      @@KeepOnTesting will let you know when it arrives.

  • @akudiluar796
    @akudiluar796 4 ปีที่แล้ว

    I am looking for an auto range multitester that is equipped with protection from 220 volt voltage so as to avoid damage when measuring 220 volt voltage but the selector position is wrong. does this multimeter have such protection? Such protection is important because I often forget to turn the selector in the right direction so that the multimeter burns and breaks

  • @camurgo
    @camurgo 5 ปีที่แล้ว

    The Fluke 289 goes up to 100mF and 500 Meg Ohm, but then again it's not a cheap meter by any measure. As for the MESTEK DM91A, I would buy myself one if it weren't for the slow continuity, deal breaker for me. Nice review.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +2

      Indeed, the continuity is incredibly slow and will negate this one from my bench as well...Too bad because I really wanted to like this meter! The Fluke 289 is an incredible meter no doubt. I had no idea it went as high as 500 Meg Ohm, very sweet.. it is pricy though! Thanks for sharing.

    • @karlheisenberg6350
      @karlheisenberg6350 5 ปีที่แล้ว

      Leonardo Camargo
      Vejo que você está atrás do multímetro barato perfeito. Se pra quem paga em dólares um fluke 289 é caro, imagine pra gente. 5 mil reais uma coisas dessas, dá pra comprar um carro.

  • @derektodd4126
    @derektodd4126 5 ปีที่แล้ว

    It was nearly there, Darren.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      Yes Derek...So close yet so far.... darn. I was hoping I was really going to like this meter!

  • @Rajnishkdhiman
    @Rajnishkdhiman 4 ปีที่แล้ว

    Hi Derren, while you are testing/reviewing you should add ac current and dc current measurement.

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว

      Depending on the multimeter, I will do more AC current testing in the future. DC mA and A are usually included with most of my new reviews.

  • @greentjmtl
    @greentjmtl 4 ปีที่แล้ว

    The VFC mode should be for testing output of a three phase variable frequency drive, to filter out the carrier frequency and show only the actual output frequency. Although if anybody is working on a three phase motor he probably shouldn't be using a $25 meter.

    • @Kwankwoliang
      @Kwankwoliang 3 ปีที่แล้ว

      What is the difference between VFC mode and Low Pass Filter (LPF) mode? Kindly advise. Thx.

    • @Kwankwoliang
      @Kwankwoliang 3 ปีที่แล้ว

      For diagnosing a machine that is using vfd and 3 phase motor, is VFC multimeter better than LPF multimeter?

    • @greentjmtl
      @greentjmtl 3 ปีที่แล้ว +1

      @@Kwankwoliang Same thing, different name.

    • @Kwankwoliang
      @Kwankwoliang 3 ปีที่แล้ว

      @@greentjmtl thx

  • @yambo59
    @yambo59 3 ปีที่แล้ว

    VFC is something to do with testing electric motors I think

  • @pollydor07
    @pollydor07 5 ปีที่แล้ว

    Bought this model 2 on eBay from Hongkong and China .

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      Congrats, it's a great little meter except for the slow continuity.

  • @zubberification
    @zubberification 5 ปีที่แล้ว

    MUSTOOL MT109 does the same 100MΩ resistance and 100mF. Thanks for the reviews.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +1

      Right you are! I've just added that one to the list Its a brand new meter as well...hopefully this is a sign of things to come. Thx for watching!

    • @zubberification
      @zubberification 5 ปีที่แล้ว +1

      @@KeepOnTesting Yea it was only released a few weeks ago, it was on sale on Banggood for $21 US when I picked mine up. The supplied test leads are pretty rubbish like most of them.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +1

      Roger that, too bad you can't buy just the meter and negate those crappy leads right out of the equation!

    • @zubberification
      @zubberification 5 ปีที่แล้ว

      @@KeepOnTesting Good thing is you can get those yellow cheapo leads that you have for $3 or a set of double banana plug leads from Banggood for $10 that come with alligator clips and different sized test probe pins.

  • @Brian-uq6jm
    @Brian-uq6jm 5 ปีที่แล้ว +1

    Had this exact meter. What a piece of crap. However, your intermittently working live function is probably just a manufacture defect, mine worked well.
    What bothered me very much is that when i measured 9v battery using the battery mode for a little too long, a fuse got blown, then the regular DCV measurement got completely incorrect reading. It took me a while to figure out the fuse blown directly resulted in the inaccurate DCV reading. After I replaced the fuse, the reading got back to normal! i was like WTF? And although the meter can warn about blown fuses, it sometimes doesn't work/warn you.
    I can't even recommend this meter to hobbyists. This is just a random meter that its measurements and behaviours are just too random. If you had to troubleshoot a board while troubleshooting your meter at the same time, it'd be a living hell.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +1

      Wow, that is not good to hear ! I agree , troubleshooting a multimeter shouldn't be part of the equation!! Thanks for the feedback and detailed reply...😃👍

  • @pollydor07
    @pollydor07 5 ปีที่แล้ว +1

    JUST RECEIVED TODAY DM91A . TESTED CONTINUITY VERY SLOW TO RESPONSE . NOT RECOMMENDED .

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      Yes indeed, as I said in the review the continuity is terrible...still , it does have some great features...its definately not the best CHEAP-O out there by a longshot..thanks for the follow up.

  • @mkilickap
    @mkilickap 4 ปีที่แล้ว

    I bought it
    perfect mini device and good work but
    it is measurement beatwean 45hz and 400hz

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว

      Roger that.. a great dmm it is...Small and loaded w features!

  • @superciliousdude
    @superciliousdude 5 ปีที่แล้ว

    Uni-T UT-61E costs around £30 ($40 USD) and does 220mF capacitance ±(3.0%+5) and 220Mohm resistance ±(0.5%+10).

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      Good grief, 220mF!! That's insane!, Thanks to you I've just ordered one of these bad boys..Thx for sharing.

    • @superciliousdude
      @superciliousdude 5 ปีที่แล้ว

      ​@@KeepOnTesting It's a nice little meter and 22000 counts at that price is amazing, but it does have some drift on the resistance ranges, so a few years later resistance might not be in spec any more. It also has no backlight which is a shame. If you can still amend your order, I would recommend that you order from a european based seller as the EU versions of the UT61E have populated the MOVs and PTCs on the board for extra protection, whereas the more common Chinese and US versions are sold without those components on the board and with cheaper crappier fuses. You can tell the EU versions because they have a GS marking and bigger fuses.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      That's great advice, can you recommend a reputable European vendor that ships to North America? I do prefer that GS marking!

    • @superciliousdude
      @superciliousdude 5 ปีที่แล้ว

      @@KeepOnTesting No idea, sorry. I bought mine from rapidonline several years ago. I paid £36 (free delivery since it was part of a much bigger order) and in those days there was no "missing components" version. Someone I know recently bought one and his was missing several components on the board and his was using cheap BS1362 fuses instead of the bigger ones in mine, and there was no GS marking on this. (That one came from an eBay seller called hotmeter).

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      No worries, I'll find a European vendor and post the results. Thanks again.

  • @pollydor07
    @pollydor07 5 ปีที่แล้ว

    THANKS

  • @aldrinelectronics4283
    @aldrinelectronics4283 3 ปีที่แล้ว

    i Like it bro

  • @OKBAOK
    @OKBAOK 5 ปีที่แล้ว

    Hi Darren where did you buy the orange case on your et8101? thanks.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      It was actually rescued from another dead meter..fit perfectly ;)

    • @OKBAOK
      @OKBAOK 5 ปีที่แล้ว

      Darren Walker ok thanks for your reply🙂 have a good one.

  • @Jose-Ribeiro
    @Jose-Ribeiro 5 ปีที่แล้ว

    Where did you find (ebay please) the magnetic case/cover/holster at 3min21s? Please do reviews on dmm cases/covers/holsters.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      I took it (recycled) from another multimeter that was damaged during shipping. It was not purchased. It does fit really well and the magnetic backing is a bonus!

    • @Jose-Ribeiro
      @Jose-Ribeiro 5 ปีที่แล้ว

      I would love to add the magnetic backing to my WinApex ET8102. Do you know any way to do that, or do you know a universal (aliexpress) dmm case/cover/holster with magnetic that i could buy?

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +1

      @@Jose-Ribeiro Sorry Jose, missed this message. Its really hard to find 3rd party dmm holsters it's really a non existant market..best bet is to salvage or swap a holster you like into another dmm if it fits. Sorry I know that's not much help.

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +1

      @@Jose-Ribeiro Forgot to add, the RICHMETERS 113D boot will fit the WinApex almost perfectly..and it has the metal hanger on the back!

    • @Jose-Ribeiro
      @Jose-Ribeiro 5 ปีที่แล้ว

      @@KeepOnTesting I would love to buy only the boot of the Richmeters. That way the WinApex will be perfect for my usage.

  • @rpdigital17
    @rpdigital17 4 ปีที่แล้ว

    I hope it had min/max feature.

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว +1

      That would've been a welcome addition!

  • @homedefenselawrence
    @homedefenselawrence 5 ปีที่แล้ว

    i think it is better at the end of video if you write down the list of pros you see and list of cons

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      That's a great idea.. Noted. Thanks for your feedback

    • @homedefenselawrence
      @homedefenselawrence 5 ปีที่แล้ว

      @@KeepOnTesting thank you, Also if you may, do review of Aneng AN8009 vs Mestek DM91A - do include your recommendations at the end, he3 :)

    • @homedefenselawrence
      @homedefenselawrence 5 ปีที่แล้ว

      opps sorry, accuracy is also important ....so a standard measurement is needed for comparison. Again thank you :)

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว +1

      @@homedefenselawrence Indeed, I'm now using a voltage reference for all of the new multimeter reviews and I'm working on other standardized testing methodology. I hope to be as concise and accurate as possible no matter how expensive or cheap the meter may be.

  • @aldrinelectronics4283
    @aldrinelectronics4283 3 ปีที่แล้ว

    DM100C reabviews pls tnx bro

  • @tomasantecky9968
    @tomasantecky9968 4 ปีที่แล้ว

    Thumb up from me mate :)

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว

      Great to hear! Keep on Testing!!

  • @nilobarbecho4088
    @nilobarbecho4088 4 ปีที่แล้ว

    VFC..voltage free contact

  • @yambo59
    @yambo59 5 ปีที่แล้ว

    could it be the range switch? press down on it, ive had to tweak them

  • @grantplaza2961
    @grantplaza2961 4 ปีที่แล้ว

    how to calibrate this one?

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว +1

      Unfortunately not every multimeter can be calibrated by the end user. Trim pots have become a luxury. Replaced by onboard factory firmware calibration, closed case calibration etc.

    • @grantplaza2961
      @grantplaza2961 4 ปีที่แล้ว

      Okay thanks! I git this multimeter but its not accurate anymore

    • @KeepOnTesting
      @KeepOnTesting  4 ปีที่แล้ว

      @@grantplaza2961 Which ranges ?

  • @packmanelectric3684
    @packmanelectric3684 5 ปีที่แล้ว

    It's also cheaper than the an8008

    • @KeepOnTesting
      @KeepOnTesting  5 ปีที่แล้ว

      Roger that!

    • @Brian-uq6jm
      @Brian-uq6jm 5 ปีที่แล้ว

      but this meter doesn't compare to aneng8008, at least the aneng was reliable while I owned it. This meter is full of randomness.

  • @panthony1525
    @panthony1525 ปีที่แล้ว

    Sounds effects ruin this otherwise informative video.