Uni-Byte 0221 - OWON XDM2041 55000 Count Bench DMM Review: Part 1
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- Опубликовано: 5 окт 2024
- In this two part series we'll take a close look at the $180 USD OWON XDM2041 bench DMM bought from AliExpress and featuring 55000 counts and 4-wire resistance measurement. In this part we look at the build inside and out and go through the extensive UI. In Part 2 we will look at it's accuracy, useability and try to take a look at the included software.
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OWON XDM2041: s.click.aliexp...
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Owon seems to use this case for different devices.
My Owon 2 - Channel Osciloscope looks EXACTLY like this.
I never saw one of their Power Supplys but that would need a fan.
YEs, they seem to use this case for a lot of equipment including other DMM models and signal generators.
Thumbs up for a real switch.
There is something compelling about a real switch.
@@uni-byte More so if batteries are involved: My Aneng insulation tester MH13 has a soft switch. Access to the battery compartment is a fingernail breaker and requires a screwdriver. My first Megger had a crank handle. Owon has a retro RS232!
@@LawpickingLocksmith Yes, on this model only, But it works fine with a good USB to RS232 dongle .. you know, if you want to move it into modern times. I may love real hard switches, but USB, especially USB-C, is really a lot better than RS232. These days how many people know and understand the typing of RS232 connectors and how to inter mix the types. What is a DTE and what is a DCE, what signals do they have and what gender are the connectors. How do you attach a DCE to a DCE? what kind of cable do you need is you have a DTE female going to a male DCE? does anyone even make that? How many gender changers and null modems will you need to get things connected. I actually got one of the best jobs of my life by knowing this mayhem back to front. No one should need to contend with that these days.
In your Brymen multimeter just short the inputs and you should be able to read the internal temp. sensor, almost all multimeter i have work that way(handheld and bench).
Right you are! Of the about 15 meters I have that will measure temperature only teh Bymen needs me to short the inputs to show the internal sensor. I wonder why?
Thanks!
@@uni-byte the thermistor internaly is for the cold junction compensation of the termocouple
@@geekrulz1 Yes, that's right.
@@uni-byte I have 2 theories: 1- The internal temp compensation sensor is connected somewhat in series with the external thermocouple, 2- It may show "overload" or whatever to tell to the user that there is no valid connection with the thermocouple as they are very prone to get broken. I can't think in any other reason... I'm almost sure that my 2nd theorie is the correct one.
@@tiagoferreira086 Theory 2 makes sense.
Kinda sad to see it could almost be 1/2 the length that it currently is. Would like to know what resistor network they're using for front-end input, and if it has any modes with GOhm impedance. I assume the voltage reference is just internal to the chip rather than separate. Might be interesting to see how difficult it is to get it to log values into a csv file on a laptop.
Looks like I didn't hit save on my last attempt, so...
I actually like the size. It's a de facto standard size so it would fit with instruments from Siglent, Rigol, Keithly, Uni-T, etc. It will fit in anywhere in a stack of those sized units. If it were 1/2 the size you would not be able to stack the typical equipment onto it. It would need to be on the top.
Honestly I forgot to check out the resistor divider. IIRC there was a row of standar SMD resistors, but it could be there to handle the 1000V rating. If I have a chance, I'll pop it open again and have a peek before part 2 and mention what I find in that video.
The voltage reference is a MAX6071. I had written that down a forgot to mention it. Doh!
No GΩ capability. Max range is 50MΩ.
I hope to check out the software in the next video.
i've got the smaller owon multimeter with a usb serial port, it uses the same protocol as this one and it would be quite easy to log to a csv with a small python script.
you can find the programming manual on the owon website
@@maebeans Yes, it could certainly be done though SCPI. I'd use C myself but I would still like to see if the included software can do it. Not everyone has programming skills.
@@maebeans Hmm, I just read the entire programming manual. There are no published SCPI commands to read the internal record table. You can create your own via direct SCPI commands to read values from a DUT, but nothing there to read the internal table as stated in the quick start guide. Time to reach out to OWON.
Awful lot of empty case there.
LOL! Yes, there sure is.