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DMMCheck Plus Multimeter Reference(and other References) - Experiences..
tatel:
--- Quote from: Martin72 on July 13, 2023, 04:21:43 pm ---
--- Quote ---Interesting thing with the dual display, must check this too.
--- End quote ---
Indeed, according to the manual single mode display is only avaible in DCV mode, also the 500000 counts.
Only when DCV, nothing else.
--- End quote ---
What looks strange to me is that 11 counts difference between DCV in dual mode vs single mode in 50000 counts mode. I mean, shouldn't be the involved guts be almost exactly the same? turning on some more led segments is enough to get a 0.02% difference?
Not that I care so much about it, but I was expecting it to read exactly the same in both display modes.
J-R:
Frequency measurements are possible in ACmA mode on the BM869s, but it may not display at very low currents.
Also, you can only calibrate DCV and ACV ranges, not any of the combined modes. The readings in combined mode can be up to 80 counts off.
I didn't have time to dig further to see what is causing the error. I think I will calibrate the ACV mode and see if that impacts it.
bdunham7:
--- Quote from: tatel on July 14, 2023, 12:54:01 am ---Not that I care so much about it, but I was expecting it to read exactly the same in both display modes.
--- End quote ---
On most meters with dual-display modes they still only have one ADC so they can't measure simultaneously. When they switch back and forth between modes, the meter may not be able to settle quite as fully as it would in the single display mode. This slight (or in some cases not-so-slight) degradation happens with almost all meters with these dual modes.
tatel:
--- Quote from: J-R on July 14, 2023, 02:42:36 am ---Frequency measurements are possible in ACmA mode on the BM869s, but it may not display at very low currents.
Also, you can only calibrate DCV and ACV ranges, not any of the combined modes. The readings in combined mode can be up to 80 counts off.
I didn't have time to dig further to see what is causing the error. I think I will calibrate the ACV mode and see if that impacts it.
--- End quote ---
Thank you. Seller has about the same opinion. I measured ACV on the "I" outputs of DMMCheck, got about 0.5V. Then I measured ACmA on the "V" terminals, so 5V. I got a good 100 Hz and 10 kHz readings at about 28mA.
So it turns out this DMM works fine and DMMCheck+ output is somehow too low on the "I" terminals for it to read Hz on the mA mode.
Martin72:
Got an answer from welectron about additional calibration of the DMMCheck plus.
Will cost about 85€, pro would be a "real" calibration according to ISO standards, including a report - I already knew it from my brymen.
Con: 85€... ;)
Will sleep about it, then decide.
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