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OWON XDM1041 the unknown multimeter...

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kwass:
I used M2 size threaded inserts https://www.amazon.com/gp/product/B07LBQFNQD/ and melted them into the mounting posts.  Just takes a second but make sure that they are level.  I used M2 screws from this set https://www.amazon.com/gp/product/B07W5J4WC9/, you'll need some flat washers to match the width of the recessed case hole.

BugCatcher:
Hi kwass,

battery based is an excellent feature!
My private "MiniLab" is 1.4m x 1.4m. I had already a lot of trouble with interference from switched power supplies and a DECT-phone-base below the desk.
Do you really use the XDM1041 during active charging? Did you observe any interference from the Qi pad (e.g. high impedance measurements)?
Active Qi pad on a lab desk ... I would expect a lot of trouble!

kwass:
Do you really use the XDM1041 during active charging? Did you observe any interference from the Qi pad (e.g. high impedance measurements)?
Active Qi pad on a lab desk ... I would expect a lot of trouble!

Yes, I do use it during active charging all the time and I've not seen any interference from the Qi pad at all -- even on high resistance (10M+ ohm) measurements and sub-uA measurements.  The Qi receiver ships with a stick-on magnetic shied and I've installed that behind the receiver coil, that might be helping a bunch.  Keep in mind that this meter has absolutely no internal shielding and it was designed with a switching power supply almost touching the main PCB and it works fine.

I thought that about the same potential issue before I started this project and did a bunch of testing before any modifications, just to be sure it would work fine.

No doubt the Qi pad adds a lot of noise to the local RF environment, but so do many switching power supplies on my bench that operate in the same frequency range.

theHWcave:
A quick update. OWON has sent me a firmware update ! :-+
You need to install a special uploader program on a Windows PC, connect the XDM1041 via serial port, then point the uploader at the firmware binary, initiate the upload on the PC and turn the XDM1041 off and on. Obviously the meter sends a special message during bootup (when the screen shows the progress bar) to the uploader. The uploader detects this and sends the new firmware in chunks to the meter and then confirms whether it was successful. Instead of version 1.2, my meter now shows 20210525 (obviously a date) as a version

In the 1 hour playing with it so far, I have not seen anything really different. Maybe the meter redraws the screen slightly faster but I can't really vouch for that. I did test capacitance mode in auto range mode and it is as bad as before (need to use manual range for >500uF ) and the hick-up every 600s in KITS90 mode is also still there.
I have asked for a description of the changes and also if I can share the firmware. Will report on responses.

davebb:
Hi
This is great news,
I hope that they do let you post it, i would like to try it , to see if it helps my High Temp reading
Great video ,looking forward for the next one,
Thanks for letting us know
Thanks Dave

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