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OWON XDM1041 the unknown multimeter...

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mapleLC:

--- Quote from: sigxcpu on June 23, 2022, 01:02:48 pm ---I will leave this information here, for all others that may be hit by my problem.

I've tried to use the utility & firmware provided here https://github.com/TheHWcave/OWON-XDM1041/tree/main/OWON%20firmware , but the meter didn't exit bootloader/restart - finished with error at "checking new version".
I tried to re-flash lots of times with the same result.

Diode/continuity was broken (showing 0 and beeping continuously), "Utility" menu was also broken. Most likely the "calibration" data was corrupted.
I wrote to Owon but I didn't get any response yet, then I've found this repository https://github.com/PetteriAimonen/owon-xdm2041-info/tree/main/bootloader and a crazy idea was born. What if I write the calibration data from 2041 (thank you PetteriAimonen) to my 1041?
To my surprise, it worked, the meter is fully functional again and, based on few tests I did, accurate enough.

Of course, now it thinks it is a 2041 on version 1.7.2 (the actual version is 2.1.2), but I can live with that.

Attached a picture with the broken "utility" menu.

LE: If somebody would be kind enough to dump the calibration data from their 1041, I would be forever thankful :)
The script to do that is here https://github.com/PetteriAimonen/owon-xdm2041-info/blob/main/bootloader/backup_calibration.py

--- End quote ---


Why don't you call Chinese customer service bro?

UniSoft:
If someone interested, there is a hidden calibration menu (I saw it in code)
UTILITY-MATH-UP-RANGE-DOWN : Enter manual calibration mode (MATH for exit)

DO NOT RUN IT!!! You will lose all calibration values!!!
It requires some additional equipment.
UTILITY-DUAL-UP-RANGE-DOWN : Enter automatic calibration mode (I never run it)

msquared:
Here' the cal data from my XDM1041. Hope this helps.

Markus2801A:

--- Quote from: BugCatcher on May 15, 2022, 11:15:36 am ---Owon released a new version of the XDM1041!

The new XDM1241 offers internal lithium battery instead of AC power. All other features look identical ...
Banggood is already offering the new device!

http://files.owon.com.cn/probook/OWON_XDM1000_Digital%20Multimeter_USER_MANUAL.pdf

BugCatcher

--- End quote ---

Has anyone ordered the battery powered XDM 1241 version?
I ordered it a few weeks ago but then got the email that something went wrong with delivery and the package was returned.
Banggood immediately offered a refund, so I don't know should I try it again? is it worth?

theHWcave:

--- Quote from: UniSoft on June 27, 2022, 03:37:23 pm ---If someone interested, there is a hidden calibration menu (I saw it in code)
UTILITY-MATH-UP-RANGE-DOWN : Enter manual calibration mode (DUAL - exit)
UTILITY-DUAL-UP-RANGE-DOWN : Enter automatic calibration mode (I never run it)

--- End quote ---
That is cool! But in mine I get a DEBUG, KEY, and LCD menu for the first sequence. The KEY and LCD menu are tests for checking key response and LCD, the DEBUG shows two additional values in the normal measurement menus which are called ZERO and COEF. Are these the calibration constants? They appear to be editable. For example in the 5V DC range ZERO is 0000000 and COEF is 0800000 in mine.

The 2nd sequence seems to run a program automatically (no choice, it starts right away) that shows all cal values line by line for all ranges. it is possible that this expects inputs for calibration but it runs quite fast not waiting for inputs. I might possible use the serial port to communicate with a calibrator connected...  Yes, it appears that's what they do in the factory with an automated calibrator attached
DONT RUN IT!  I completely lost calibration on all ranges! !!   :palm:
I do have a dump of my CAL values, now to see if I can load it back ... will report on it  |O

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