Hi everybody. Something strange happens with our U3-LV. The same analog voltage (coming from a proximity sensor) are read by U3, sometimes around 1.2xx V, other times (after a few hours) as 1.8xx V. We simply cannot understand what's going on. Checked with a precision voltmeter, the signal is always 2.221 V. We use low-level functions and python under linux. Any kind of help will be really really appreciated. Thanks to everybody.
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The first thing to try is to disconnect everything but the USB, then connect a wire between the analog input and ground. Is the reading stable now?
If there GND test works then my best guess is a grounding issue. Make sure there is a strong GND between the signal source and the labjack.