Products > Test Equipment
[Poll] Benchtop DMM Acceptable Power On Time?
coromonadalix:
Some Keysight have an windows ce embedded if i recall, that's why it can take a while,
other Keysight are linux / vxwork ... based ...
Black Phoenix:
--- Quote from: Leeima on November 18, 2022, 11:32:12 am ---I hadn't considered handheld multimeters. A fast on time is even more important with them, since you're always switching them off to conserve the battery.
The 189 is definitely faster than the 87IV (I don't have either of mine to hand to check)
--- End quote ---
Sorry the title before didn't specify type and I'm not that verse with model no.
bdunham7:
--- Quote from: Leeima on November 19, 2022, 09:10:08 am ---What level of precision do you consider to no longer be a general purpose meter? For me I'm thinking 7.5 digit and 8.5 digit are not general purpose.
At my place everyone has at least one 6.5 digit meter.
There's not much in the price between a 5.5 digit and 6.5 Benchtop meter, so I don't tend to bother even looking at the 5.5 digit models.
--- End quote ---
That's a fair question and I suppose different people use the term 'general purpose' differently. I was thinking 'basic', like check this battery or do a quick continuity check. I'm not at a bench full time or even every day, so leaving the meters on all the time is not really a good option. In the sense that they do everything--capacitance, diodes, current, frequency, digitizing--I suppose modern 6.5 digit meters are 'general purpose', but so are many 7.5 and 8.5 digit models. My thought is that if you actually need 6.5 digits worth of precision, waiting 30 seconds is no big deal--you can turn the meter on first and then get set up to measure.
That said, I suppose 25 seconds from standby is a bit hard to understand--why even have the standby function? Still, I think the best solution is multiple meters since it is pretty common to need to measure 2-3 things at once. After some experimentation, I settled on the solution pictured--the 'boot times' from top to bottom are ~15 seconds (2 sec from standby), 3 seconds and 0 seconds. This works better than handhelds because I don't have to rummage around for the meter, find a place to put it and untangle the test leads--it's just there and ready to go. I don't know what you can buy commercially today to replace these.
nukie:
This is a good reason for buying a DMM with a instant on nature. If you are not willing to leave your 6.5 digit meter on 24x7 then buy a fast starting 4.5 DMM. Generally bench meters are meant to be powered on and kept warm. Solar panels perhaps. I can't tolerate a 'booting up' portable dmm.
Kleinstein:
The startup has 2 parts: one is booting the OS, that modern DMMs, especially those with graphics or LAN interface use. The parts is doing some self test on power one - for certain instruments new regulation require a self test. The problem there is that a really stringent self test also needs the analog hardware to be reasonable settled a possibly even thermally reasonable stable (e.g. for a heated reference) before the more sensitive parts of the self test are done.
With a standby mode the boot time should be relatively short - no real excuse for more than some 10 s there.
For high accuracy measurments one needs the warm-up time anyway, but quite often one also uses the meter (maybe not so much a 8 digit one) for tasks that don't need the full performance and just want a fast result. With 4 wire ohms a handheld meter is not really an option there.
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