Products > Test Equipment
OWON XDM1041 the unknown multimeter...
theHWcave:
Ok, using the first DEBUG menu, I managed to get the 5V DC range back. I connected the meter to my DMMCheckPlus reference of 5.0000V and changed the COEF value which did change the reading on the display. Strangely when I hit the RUN/STOP key the COEF jumped to a value which corresponds to exactly 5V. The other ranges are all still hosed. So, manual cal works but I still need to see how to reload the cal dump.
theHWcave:
Luckily i had made a recent dump of all CAL data and was able to reload that just now. Everything seems to work as before :phew:
For all you XDM1041 users: Petteri Aimonen's tools to save and load CAL data are here https://github.com/PetteriAimonen/owon-xdm2041-info/tree/main/bootloader They are for XDM2041 but work just as well for the XDM1041
kwass:
I figured out a lot of the calibration process:
Enter calibration as specified about: Utility, Math, Up, Range, Down, Debug (softkey)
Pick the function and range you want to calibrate, each range has it's own calibration values stored.
Toggle between the "zero" and the "coef" number (on the display) using the Range key
Move to the digit you want to change with the Dual key -- it always moves the cursor left to right but will cycle around.
Use the Up and Down arrow keys to increase/decrease the value, it will roll over/under the higher order digit.
You can calibrate the range to any value that you feed into the meter, it need not be the full scale value, 5.0000 volts for example. If you want to use 5.0000 volts then you can short cut this process and just hit the Run/Stop button.
Exit calibration mode and save you settings at any time by hitting the Math key (not the Dual key as it says above).
I was able to calibrate all ranges for all functions doing this. However the capacitance ranges are sort of funky, but still work ok. In all cases I set the "zero" number to all zeros. I have no idea if that's right or not, but my meter is very accurate now, much better than it was from the factory. I calibrated against a Fluke 8846A.
UniSoft:
--- Quote from: theHWcave on July 01, 2022, 08:06:32 am ---The 2nd sequence seems to run a program automatically...
it is possible that this expects inputs for calibration but it runs quite fast not waiting for inputs.
--- End quote ---
I guess that. That's why I never run it...
By the way, did you try to contact support to request for the new version of firmware?
I tried many time, but they no even reply :(
Does anyone know which TFT display they use?
I was looking for it but did not find with such a pinout.
D0...D7 - 8-bit Data
PB10 - CLK (Clock)
PB2 - DC (Data/Command)
PB1 - CS (Chip Select)
theHWcave:
--- Quote from: UniSoft on July 01, 2022, 09:31:12 pm ---By the way, did you try to contact support to request for the new version of firmware?
I tried many time, but they no even reply :(
--- End quote ---
Oh, I was literally pounding continuously on OWON's door for a firmware update. Twice they sent me the same one I already got |O and published on my Github page (May 2021). Finally, they said asking again is no use because they made a newer version of the meter and new firmware is only compatible with the newer hardware. Thank you, OWON for abandoning your initial customers ... :--
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