Unstable temperature readings | LabJack
 
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Unstable temperature readings

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SteveK
SteveK's picture
Unstable temperature readings

I have a ue9 Pro constantly monitoring temperature through two 1022 type probes on AIN1 and AIN2.  Periodically they give stream of crazy temperatures ranging around -147 and -250 and then revert to what I presume is an accurate temperature (around 20C). Any ideas what may be causing this?   The system is mounted in a shed with lots of extraction fans and fluorescent lights, any chance that interference through the power supply could be causing this ?   The device is linked via ethernet with the supplied external power supply.  The crazy temperature readings persist for 5 or more minutes, so I doubt if it is simply a fan or a light starting up.

Thanks

LabJack Support
LabJack Support's picture
First suggestion is to look

First suggestion is to look at the raw voltages at the same time to see if they are also out of whack.  Also, jumper AIN0 to GND and AIN3 to VS and watch those at the same time to see if they do anything strange.

SteveK
SteveK's picture
>>> Also, jumper AIN0 to GND

>>> Also, jumper AIN0 to GND and AIN3 to VS and watch those at the same time to see if they do anything strange.

That's a good idea, I will try it and report back.