Products > Test Equipment
OWON XDM1041 the unknown multimeter...
theHWcave:
A list of all SCPI commands for the XDM1041 as far as I have discovered and tested them
Regarding firmware 25052021: its has issues on SCPI. For some reason, the XMD1041 now responds to every command that isn't by itself returning something with the string OK\nOK\nOK\n (the \n being new line control characters). It does that even if you send nonsense like "hello world". :palm: I think that change is the reason that the DMMEasyControl Windows software you can download from OWON to remote-control their multimeters can't change functions anymore. The SCPI commands still work but your software now needs to deal with that nonsense response. Therefore I would not recommend this firmware change. :--
davebb:
Hi i have just been playing with my meter, i have been compering it against a Fluke 189 that my old work mate gave me as he has just finished work for good as he is now 70 years old he also gave me a load of crimp tools and 2c Metcal soldering irons and a box of tips for them, He said that there was a meter in the box , but i did not expect a fluke 189 in great condition, i worked with him 13 years ago, i have not seen him for about 8 years, so it is good to keep in touch by phone :-DMM ,
the owon readings for dc voltage and resistance are very close to the fluke but what i did find is the dc current reading was out a bit, at 10 amps it was reading about 400ma low,
could this be corrected in the firmware ?
I do love the new to me fluke 189, peaple are still asking £370-400 on ebay for them,
Thanks Dave
Kleinstein:
The 10 A ranges on relatively cheap meters and also with some of the better hand-helds can suffer from heating of the shunt. So especially at a high current applied for a longer time, the reading may no be very accurate with both meters. It may be better to compare the 10 A range at a low current, like 2 or 3 A. So less heating and likely a more accurate reading.
The calibration procedure can likely adjust the skale factor for the 10 A range. With a modern meter this is done in software an not with an old style trimmer. Usually the factory calibration should be better than 4%, even with an OWON brand. The calibration procedure may not be openly available and may effect other ranges too - so nothing one would like to call if not absolutely needed.
The 10 A range on the fluke may no be perfectly protected by the fuse, so it may have suffered over years of use. So while it is a Fluke, I would not call a reliably reference for a recalibration. It is no clear which meter is out more.
davebb:
Hi
it is the owon that is reading low, not the Fluke, The Fluke is perfect, i did compare the meters at a low current,500ma and up, i have Klunkin load ,
The owon reads low on the current range from mili-amps to 10amps and with 10 amps the owon is reading 9.6amps 400mAmps and 200ma low on 5amps load, i can leave 10amp on it and it does not change so i dont think it is heat
Thanks Dave
theHWcave:
How strange. My Owon was within 0.02% of the BM869S for DC current from 1A all the way to 7.5A (which is as high as I could test). The BM869S is rated to 0.5% for current (same as the XDM1041 and the Fluke 189 for that matter). From 500mA to 1A it was within 0.04% of the Agilent 34401A and from 1mA to 100mA witihin 0.02% of the Agilent 34401A
Even if we assume that the Fluke is reading 0.5% too high, i.e. it shows 10A when the true current is only 9.95A and the Owon 0.5% too low so that it would read the same current as 9.9, your result of 9.6 on the Owon is way out of spec.
Also the XDM1041 spec says that for >7A you should measure for a max of 30 seconds with 30 seconds off afterwards. Especially if you are ramping up the test current slowly, say to test the meter in 0.5A steps, that heat & time limit is easily exceeded as heat is of course accumulative. The Fluke has a similar time restriction but only for >10A I believe.
Kleinstein has a valid point here and hopefully nothing got permanently damaged during your earlier tests. To exclude heating effects you should run accuracy tests for higher currents from cold, both meters in series and off for some time, and compare the readings in the 1st 30 seconds.
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