General > General Technical Chat
What's the point of hold or auto-hold in DMMs? Ever seen a properly working one?
<< < (5/5)
RoGeorge:
The video is from 2012, I don't think they still sell those models.
My best guess is they knew, but they have had no way to fix that faulty auto-hold.

It's even more amazing this thing was designed for electricians, and it was designed to hang on the belt.  No way one can probe, then look at its own belt without risking a short-circuit.  :palm:

Not to say measuring a vibrating circuit, like for example the alternator of a motor and so on.

Look at this flyer, poor guy might die pretty soon if he keeps measuring like that:
https://docs.rs-online.com/6e0e/0900766b80a57a09.pdf  :scared:
AVGresponding:
That's a serious facepalm moment from a company that normally produces pretty good stuff. As well as the MX-57EX I have a rather nice F21 clamp meter, which has a manual hold button, easily pressed with the thumb while clamped onto a cable.

Though for probing stuff I use either my F87V or T5-1000 at work.
tszaboo:
So it's just a bad implementation.
I've used a Keysight handheld one, had the Bluetooth on it's back. Used auto hold. I could measure 10 points on a PCB, and log all the measurements (and only those) and it sent it through the BT to my PC which was running excel, making statistics from several boards in no time. Mind you this was before Keysight broke all it's software implementations for that benchvue crap, back then you could do this without paying them extra for software.
mwb1100:
Brymen BM78x also has a good autohold.  As far as I know the BM78x is the only Brymen meter series with the feature.  It differs from Fluke's a bit in that it doesn't freeze the display at each stable reading, it just latches it internally.  Then when you remove the probes it will display the most recent stable (and significant - ie., not 0V or OL Ohms) reading.  However when it has latched a value, if the reading becomes unstable it will clear the latched value until it stabilizes again.  If you remove the probes during the "unstable" state, it will display "-----" instead of the last stable value (which is what a Fluke would display).

Either is a reasonable approach.  And both cover the normal use: turn on autohold, probe a signal, set the probes down (so you can write/type your finding for example) and the value you probed will still display on the meter.
Navigation
Message Index
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod