Hello Paul,
It would definitely help to have some more information about what
behavior you are seeing. Are the analog input values rising or falling
to the maximum or minimum specified in the input range of your DAQ
task? This behavior is called 'railing', and this will happen when
taking a measurement from a channel that has no signal connected to it.
The best way to determine if the problem is something hardware or
software related is to see if you can replicate the behavior in the
test panels in Measurement & Automation Explorer. First you will
want to make sure that your device passes the self-test. If not, try
right-clicking on your device and selecting 'Reset Device'. You can
then use the test panels to test the analog input, analog output,
digital, and counter operation of your device. These test panels make
direct driver calls to your devices, eliminating the possibility of
there being a problem in your LabVIEW code.
Another thing you could try is the
Online E-Series Diagnostic Utility. This utility will systematically test the functionality of your card, and generate a report of its findings.
Let us know your findings from the test-panels in MAX and the E-Series
Diagnostic Utility, and we can do some further troubleshooting from
there.
Regards,
Travis Gorkin
Applications Engineering
National Instruments
www.ni.com/support