Products > Test Equipment
have ever you seen multimeter back light change the last counts on the display?
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magic:
It's interesting that the reading decreases, which corresponds to increasing reference voltage, unlikely to be a result of power supply sag.

Maybe the problem is that they failed at star grounding? Teardown time?
modz786:
a previous reply had slightly newer firmware and no issues with reading discrepancy im sure its firmware related fix and wonder if any other owners have my issues

hmmmm now second thoughts perhaps the reason they dont simply supply latest firmware is that its a hardware issues thats resolved on newer serials numbers now and they dont want to expose themselves ....poor star grounding layout perhaps
Muttley Snickers:

--- Quote from: modz786 on May 27, 2024, 02:19:11 pm ---OK unboxed just now and cold start we read following
5v source (5.00024) in calibration fluke 8840 reading
OWON in Auto V...ambient room temp 25 Celsius...Mid speed
4.9995 backlight off
4.9992 backlight 100%
4.9993 backlight 50%

after warm up 30 mins
4.9990 backlight  0ff
4.9987 backlight 100%
4.9988 backlight 50%
with and without 5v charge results same.
Resistance ranges not affected by backlight

--- End quote ---

Out of curiosity I just ran the same test using an AD584KH reference on an XDM-2041 and it was rock solid without any fluctuation. Mind you it's a mains powered unit but they may share similar internals or architecture, I believe these use a Hycon HY3131 but I haven't opened it yet to check.
ironcurtain:
I have an AD584 reference board somewhere.

I will check later, I don't think I have a suitable battery for it though.

Will bring the details of my unit delivered this week, it should be "fresh stock".
modz786:
a 9v battery should run it i use 4x1860 just because i only have a 4x battery container my ad584 just with input jack not spring battery mounts besides the input voltage should be above 4.5 volts
a UPS 12v battery has been used
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