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Extech DMMs

Discussion in 'Electronic Equipment' started by Anthony Fremont, Feb 26, 2007.

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  1. John Larkin

    John Larkin Guest

    I haven't used their dmm's (I like Fluke) but I have several of their
    other gadgets - IR thermometer, air flow meter, LCR meter - and they
    all seem very good.

    John
     
  2. It claims "600V input protection on all functions (1000V on Voltage)",
    so that would mean well protected on ohms, diode, and cap ranges etc

    Dave :)
     
  3. Yeah, Fluke is nice, but maybe a bit too rich for me plus I'd like a bit
    more frequency counting response than 200kHz, well actually I'd like allot
    more. ;-) Trying to keep things in the $200 area. Thanks for sharing
    your experience.
     
  4. chuck

    chuck Guest

    I've been very pleased with their LCR meter. If buying a new DMM, I
    would consider Extech.

    Chuck
     
  5. Thanks so much for pointing that out. My Micronta spoiled me all these
    years by surviving such things without flinching. It's a concern for me as
    I'd really hate to kill an expensive meter by making a stupid mistake. It's
    pretty much what happened to all my old analog meters, AC in Ohms
    mode.....poof....

    As you noticed, I started a new thread since the other was old and getting a
    bit OT. ;-)
     
  6. Ben Jackson

    Ben Jackson Guest

    We have one of these at work:

    http://www.extech.com/instrument/products/400_450/400series_EX450_EX470.html

    It's a fine IR thermometer, but it's a sucky DMM. Everyone avoids it like
    the plauge in favor of fluke meters. We replaced the leads on it a few
    times before realizing it was just a flakey ohmmeter.

    If not for that experience, I'd probably own one, since I've seen that
    model for under $125. It's a shame, the specs on the 470 (450 + LCR)
    look nice.
     
  7. Ouch, that's not good. Was it problematic from the start? Could it have
    been damaged/dropped? What do you mean by flakey; inconsistant, slightly
    off or wildly off?
     
  8. Jim Yanik

    Jim Yanik Guest

    You don't want to use a DMM for freq. counter,they will NOT have accuracy
    comparable to a real freq.counter;use a real Freq-counter.

    Look at the specs a bit closer.
     
  9. Jim Yanik

    Jim Yanik Guest

    high resolution is no good without accuracy.

    and DCV accuracy does not transfer to frequency measurements on DMMs.
     
  10. Jim Yanik

    Jim Yanik Guest

    It could have just been bad internal connections(loose) to the ohms jacks.

    Of course,without 4-terminal measurement,you are not going to get high ohms
    accuracy anyways.

    If you want a good high accuracy digital meter(6.5 digit),get a HP/Agilent
    14401A.
    AND it probably has a faster measurement,and better ACV accuracy across a
    wider bandwidth.

    It's not a handheld,though.
     
  11. Thanks, I have a frequency counter already but it's not portable. I don't
    need high accuracy on the frequency counter, just a good idea of what's
    going on. I play with PICs and it would be nice to be able to quickly check
    a pin that's being toggled without having to drag everything to the "bench".
    I do want good accuracy on the low current and low voltage measurements.
     
  12. ..03% on DCV seemed pretty good to me.
    Not that I need even this accuracy, but they are claiming .008% on frequency
    measurements. I would rather it be able to read up to 10MHz instead of
    2MHz.
     
  13. Ben Jackson

    Ben Jackson Guest

    It's probably been a year since I used it to measure anything, I don't
    recall. It was relatively new when I used it (it was purchased for the
    IR thermometer) so I don't think it had been mishandled. Whatever it did
    wrong was enough that I questioned the results and got another meter.
    Could be an anomaly -- my sample size is 1!
     
  14. It was starting to P(r)ong a bit!

    An older thread had some support for the ExTech:
    http://groups.google.com.au/group/s...frm/thread/5534e068a5413dd7/41d9d5e4030c8442?

    And look who was there too, none other than Roy L. Fuchs, a.k.a
    MassiveProng

    Dave :)
     
  15. Looks like "igor The Terrible" likes Extech. I hate to say it, but if the
    Protek 6800 could measure DC current with better than 1uA resolution, I'd be
    tempted. Most of it's other specs look pretty decent, excepting the battery
    life of course. ;-) Since I'm quickly approaching the $300 mark, I'm
    rethinking this. In this price range I should probably be looking at
    equipment I don't already have, like a logic analyzer.

    I think I had less trouble picking a wife. ;-)
     
  16. Jim Yanik

    Jim Yanik Guest

    OTOH,I can remember when a digital freq. counter was the size of a 25 inch
    TV set,and used vacuum tubes.


    Do you really -need- 6 digits and .03% DCV accuracy??

    (I bought a Metex M-4650 4.5 digit DMM years ago for $99,from Jameco;.05%
    DCV)
     
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