Products > Test Equipment
OWON XDM1041 the unknown multimeter...
robdejonge:
--- Quote from: theHWcave on October 31, 2021, 11:20:53 pm ---Besides the XDM1041, I have an Agilent 34401A, Solartron 7150+ , HP3478A, BM869S, BM235 and a couple of other handhelds but the XDM1041 has become my most often used meter for repair work on the bench because its so convenient, small, and always on.
--- End quote ---
That says a lot!
robdejonge:
Why does the meter require a function switch between mV and V for the VDC and VAC measurements?
I recently saw a comparison of the XDM1041 and XDM2041 by Tony Albus
https://youtu.be/ZVDJSa3pxrY
The big brother of the two does not have the weird "function switch" requirement. But it seems to be using the same software or at least software framework. I'm curious what would necessitate the requirement of such a switch in the software. Is there a hardware reason? Or could we (let's not hold our breath!) eventually see Owon correct this issue in a firmware update?
theHWcave:
You are right, there isn't a hardware issue for that as far as I can see. At least for volts... It needs to do the same for current but there the reason is that A and mA/uA use different input sockets. Could be something with the HY3131 front end? But nothing that the firmware could not fix. Does Dave's 121GW do the same thing? It has the same front end chip. OWON is sluggish at best responding to bug reports. What I hope is someone writing completely new software. This meter looks to be very hackable, since the front end used just an SPI interface and I think 2 discrete signals to drive relays
Kleinstein:
The separate mV and V ranges are a bit odd. It could be just avoiding the very long list of voltage ranges, that may not fit the screen. This should be a SW only issue.
It is interesting that the reading rate via the PC interface is quite a bit higher than with the updates on screen.
For the K-type thermocouple it does not really mater if the temperature is ITS90 or a different curve - the differents are so much in the details not even the 34401 with a PT100 may notice.
ciccio:
I received my meter form Banggood yesterday.
First impression was positive, but when I checked temperature measurement, I discovered that readings from a know good PT100 vere off, sometimes very off. Reading increased slowly from 21 to 160 °C
My resistance box was not available, so I checked at three resistance values, and it was almost correct at 0, 100, 200 ° C.
Will check later with a better decade box.
As for thermocouple, the data sheet says K type, but the meter allows to select "LOAD" (why Load and not Source? ) as PT100 and KIT90 TC, which I discovered being a new designation for K type.
With a known good TC, it seemed to read correct values.
I will examine cold junction compensation as soon as I'l have a free evening.
The software installation was a nightmare, I will try next week on a Windows 10 PC.
My Windows 7 work machine seems to be allergic to N.I. VISA32 installation.
I had the same problem with the software for a JUNTEK function generator.
Best regards
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