Hello, I have an NI 9205 measuring the voltage drop across a resistor in a super-simple test circuit with a 12 VDC power supply. For some reason every 10-12 seconds, the measured voltage across the resistor drops to zero for a period of 3-4 seconds, and then comes back again. Screenshot attached (time in 1/10 sec).
I am monitoring the same voltage with a multimeter, and it shows a steady voltage. I have tried using different pairs of pins, same result. I am using the differential terminal configuration. I have an NI 9213 in same chassis measuring temperature with a thermocouple, and it gives steady continuous readings.
Many thanks for any suggestions, going a bit mad.