Swept Sine Wave signal drift

[arwong]

I am using the "Getting Started with Swept Sine Wave" example which comes with the Sound and Vibration toolkit. As soon as I start running the program the stimulus and response signals begins to drift up to about 4.5 Volts. However, when I connect the the stimulus to an oscilloscope, the oscilloscope reads no drifting in the signal. I am using a PCI-6052E and an SCB-68. Does anyone have any ideas why this is happening?

[dsb@NI]

Most probably, the answer is in the input terminal configuration. On the analog input tab of the example, change the input terminal configuration for both the stimulus and response channels to "ref. single-ended". The oscilloscope channel is, in effect, providing a referenced ground, so you don't see the drift when you probe the output.

If this doesn't work, give us some more details about the version of the toolkit, whether you are using swept sine in DAQmx or in Traditional DAQ, and what parameters you have specified different than the defaults.

[arwong]

That fixed it. Thanks for the help!