I am using LW/CVI 4.0 and am performing DAQ with an SCXI 2000 chassis containing
SCXI 1200, 1102, 1161, 1303. We are taking Thermocouple readings each second
or so and send an output signal based upon these readings. The program runs
a timer loop while in operation. It works fine most of the time, but every
so often the temperature readings, which usually measure between 200 and
500 F, will start to drop, first to about 50, then they become negative and
march quickly off towards negative infinity, decreasing greatly each time
through the loop. Other times they will march upwards, becoming large positive
numbers quickly. However we know the actual temperature has not deviated
from between 200 and 500 degre
es. Does anyone know what on earth could be
causing this? Could it be electrical noise? I cannot figure this out for
the life of me.
Can one open thermocouple cause the rest of them to be misread? If so is
there a function I can use to get around this? Any help would be gratefully
appreciated.
Jeff Blackburn
