# Extech DMMs

A

Jan 1, 1970
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#### John Larkin

Jan 1, 1970
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Anyone have any experience with them? Are they easy to zap? Specs and
prices look good enough, what say the masses? I'm considering the MM560
here:
http://www.extech.com/instrument/products/alpha/MM560_570.html

C

Jan 1, 1970
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#### Anthony Fremont

Jan 1, 1970
0
David said:
It claims "600V input protection on all functions (1000V on Voltage)",
so that would mean well protected on ohms, diode, and cap ranges etc

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. ;-)

B

#### Ben Jackson

Jan 1, 1970
0

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. A #### Anthony Fremont Jan 1, 1970 0 Ben said: 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.

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?

J

#### Jim Yanik

Jan 1, 1970
0
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. 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. J #### Jim Yanik Jan 1, 1970 0 J #### Jim Yanik Jan 1, 1970 0 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? 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. A #### Anthony Fremont Jan 1, 1970 0 Jim said: "Anthony Fremont" <[email protected]> wrote in 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. 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. A #### Anthony Fremont Jan 1, 1970 0 Jim said: high resolution is no good without accuracy. ..03% on DCV seemed pretty good to me. and DCV accuracy does not transfer to frequency measurements on DMMs. 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. B #### Ben Jackson Jan 1, 1970 0 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? 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! D #### David L. Jones Jan 1, 1970 0 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. ;-) 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 A #### Anthony Fremont Jan 1, 1970 0 David said: It was starting to P(r)ong a bit! Exactly 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 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. ;-)

J

#### Jim Yanik

Jan 1, 1970
0
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. ;-) 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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