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OWON XDM1041 the unknown multimeter...

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theHWcave:
I have this meter and I would strongly advise caution in trusting anything that's written on that Owon Hongkong page. Notice how they dither between USB or RS-232? They avoid making a clear statement. Of course nobody these days has RS-232 on a PC/laptop so we all use USB to RS-232 converters to talk to the meter using USB. And he presto, now your marketing people claim you "can"  talk to the meter over USB! Of course you do  :palm:

Could you easily add USB, yes and no. No, if you mean a fully capable USB interface that is supported by the processor to for example mount and use USB sticks that you may plug in. The reason is that there are only 3 signal wires (tx,rx,gnd) that go from the digital board to the interface board and these are already RS-232 on TTL level. All the interface board does is convert these to RS-232 levels. It would need a relative large revision to change the hardware and firmware to do proper USB. Maybe they will do it eventually but I would not hold my breath.   But if you want to replace the DB9 with a USB socket, nothing stops you from removing the level converter chip and replacing it with one of the standard USB-to-serial chips (usually some chip from Prolific or clone) that are normally embedded in the ubiquitous adaptor cables. That gives you a physical USB port for the marketing people but that "USB" would not give you any more capabilities than what you get now with a cable converter, i.e.  a simple COMx or ttyUSBx interface.

The greatest humbug IMHO is the record function. Absolutely useless! Yes the meter can record up to 1000 entries manual or automatically but there is no way to download them. I tried all kinds of methods. And don't be fooled by the Owon PC software. In desperation, I finally gave in and went through the pain of installing it. I also rigged up a complex setup with my scope to sniff and protocol-analyse the exchanges between the OWON PC software and the XDM1041 to finally learn the secret how they access and download the recorded data over the serial interface. Turns out they don't. What they do instead is make a new recording (reading new measurements via SCPI and storing them in a text file on the PC). I think there is simply no way accessing remotely whatever you may have already recorded on the meter. Even more expensive OWON meters have nothing of that sort in their SCPI implementation. I think in those meters you can dump the recording on a USB-stick but that would require a "proper" USB interface and that (see above...)  |O

rdl:
What is the point of the big "Trigger" annunciation on the display? The little square next to it seems to blink in sync with display updates, but that seems pretty useless to me.

theHWcave:
Yes, in the XDM1041 its only purpose is to show that the display is updated ... There is no setting or anything to influence trigger apart from the "run/stop" button but that is a simple hold (no auto-hold or anything fancy)

coromonadalix:
Would it be better to call it  something like a "gate",  or "measurement in progress"   which could take too much space on the screen ...

davebb:

--- Quote from: theHWcave on June 03, 2021, 06:16:35 pm ---Yes, in the XDM1041 its only purpose is to show that the display is updated ... There is no setting or anything to influence trigger apart from the "run/stop" button but that is a simple hold (no auto-hold or anything fancy)

--- End quote ---
Hi Great Youtube videos
it was me with the temp problem with my meter, as i said when the meter is cold the temperature Reading is very good
after about 10-20mins of the meter being on the reading reads 4-5d/c higher, what does your meter read with the k type
disconnected ?
can you please tell me is there a temp reference in the meter and what does it use to do this, or is the reference in side the meter HY3131 chip, i have re soldered the chip but this did not help,
also i took a photo of the ch 340 usb board that is fitted to mine, you can use it in your vids if you want to,
Thanks for your help ,
Dave 2E0DMB

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