Hi,
we are using a cRIO9022 System equipped with 2 NI9403 and 3 NI9205 cards to control a selfbuilt instrument for atmospheric research.
Now the following problem occur:
All I/Os oft the 9403 cards are set to output. One 9403 card is used to control one module of our experiment. Sometimes all output lines of this card are going in an oscillating state. All 32 lines are pulled down by 47k each. During this test mode a Stirling cooler is running, which generates a lot of noise on the 9403 control lines. But this alone doesn't make this problem. We must swich on in addition a heater with PWM control. Then sometimes this problem occurs, not always!
Have anybody an idea what the reason for this problem could be?
Thanks in advance!
Peter Knieling
University of Wuppertal
Germany