Products > Test Equipment

New EEVblog BM786 Multimeter

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HKJ:

--- Quote from: Fungus on October 30, 2020, 08:41:52 am ---(How many digits before we have to control air pressure, too? Anybody know? I'm sure I read somewhere that some multimeters have a maximum altitude in their specification.)

--- End quote ---

That is due to high voltage arching, more isolation distance is required at low pressure.

Kleinstein:
Another problem at high altitude is that cooling gets less effective, both passive and with a fan. At least the fan could compensate with a little more speed.
The main limit is the required (by the standards) distances going up at 2000 m altitude. So it's very common to find a break / limit at 2000 m, especially for higher voltage instruments.

There is a small effect of pressure detectable for the metal can references (e.g. LTZ1000, LTFLU) - something in the sub ppm range. So only relevant of the very high end. This would not really limit the use at higher altitude - maybe a point to those who send a reference to NIST in colorado.

There is always the problem of having voltage so you just have to switch to the next larger range. This can happen with 2000 counts and can happen with 6000 counts. There is nothing so special with the leading 1, it's more or less an even distribution on a log scale. It was a bit special in the old times (e.g nixi tubes) with the display part was expensive.

Fungus:
The Fluke 87V manual says:


joeqsmith:

--- Quote from: Nixfried on October 30, 2020, 07:48:54 am ---
--- Quote from: joeqsmith on October 29, 2020, 12:09:26 am ---If I only would have only taken a minute to read the title of that wiki page on Benford's law and became an expert, I could have saved myself $12K on the new 8.5 digit Keysight meter.

--- End quote ---

Awesome! 3458a robustness test incoming?  >:D

--- End quote ---

Once I learned I didn't need anything that fancy, I traded it in on a new Harbor Freight meter.

UnexpectedBill:
I am curious if this meter will have any PC link/datalogging capabilities. Based on the manual and PCB pictures, I'm guessing that it will not.

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