Products > Test Equipment
OWON XDM1041 the unknown multimeter...
theHWcave:
@Kleinstein: The only temp. sensor is the one inside the HY3131. Its physically a fair bit away from the probe sockets and not thermally connected other than through quite a bit of PCB material and ambient air inside the meter. That said, I stuffed an external k-type sensor into one of the sockets and measured the temperature which is within 0.5 deg. the value cold junction temp shown by the meter. I guess that is kind of acceptable (given the price etc)
theHWcave:
@davebb
what a terrible format that OWON PC software produces.... :--
Besides that, the good news is that your meter behaves exactly like mine. Every 10 minutes the cold junction is updated. :-+
18:47 25.6
18:57 jump to 29.7
19:07 jump to 31.2
So that part works as expected and the firmware did not do anything bad (or good)
Now with that established and the meter in a warmed-up state can you give:
1. the temp reading and the measure value shown on the display with probes shortened
then replace probes with K-type (the right way around ! and take care not to touch close to the tip)
2. he temp reading and the measure value shown on the display with the k-type in and what value it should be (according to some other thermometer you have)
Thanks
davebb:
Hi
The meter has been on for some time withe the input shorted it reads 33.4c 000.02mv, and 25.4 on another thermometer
with a k type it reads 34.6c 000.07mv, and 25.5 on another thermometer ,
When the meter is on from cold i had a reading with in 0.5deg c betwen meter with probe and thermometer
Thanks Dave
theHWcave:
Very strange! These values seem correct. That is, if the socket temperature (cold junction) is indeed 33.4 deg.C and the measured value with K-type is indeed 0.07mV then the readout should be 34.6 deg C. To see 25.5 in this situation, the measured value should have been -0.301 mV. Are you sure this thermocouple is working and is a k-type? Also what are you using to plug it into the meter? Can you send a photo of the way the couple is plugged in?
Thanks
davebb:
Hi i am using a k type with 4mm plugs from another owon OW18E handheld and the same with another one from another meter and with that meter is reads slightly lower then my room thermometer, if voltage reading is correct why does the internal temp in chip reading go so high as well after 10mins, did they use the wrong calibration settings at owon, and both read correct when the meter is cold ,
Thanks Dave
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