rmorais,
What kind of readings are you getting? Do you have the module
configured for -10.4 to 10.4 Volts? Have you double checked your supply
voltage with a DMM or some other device capable of measuring voltages?
Finally, do you see this incorrect reading on only one channel, or all
the channels? Please let us know the details of the error and I'd be
more than happy to help.
Regards,
Ryan Verret
Product Marketing Engineer
Signal Generators
National Instruments