I am getting a voltage spike on starting and stopping a daqmx task

Hello,
I am having a problem with a PXI-4461 DSA board that I can't explain. When starting or stopping an analog output task, I am getting a voltage spike before the generation starts and after it stops. We have put a speaker on the output, and the spike sounds like a "pop" when that happens. However, the pop goes away when the card is also acquiring an analog input in the card. This is a repeatable event, and very strange. We have used the two examples "ContAcqGraph Voltage" for the analog input and the "Retriggering_Analog_Output_Waveform_Generation" to generate this phenomena.
Has anyone ever seen this before? Is our card the culprit?
Thanks,
Rob

Hey Rob,
I found out some information that might be helpful to you. There was a problem identified with that particular SVT example awhile ago where spikes would happen due to a Device Reset during the generation. This device reset was performed by default in the example if there was an error with the AO generation. Since your code was based off of this example, I believe that there's a Device Reset happening due to some error. If you could, please go through your application and ensure proper error chaining so that any errors generated are seen by the user. You can also go through and probe the error clusters coming out of the VIs in order to get a quick picture of what might be happening.
The specific VI in question is "SVT Close Swept Sine (DAQmx).vi". You can set a breakpoint before the "DAQmx Reset Device.vi" on the block diagram and verify that this is happening(see attachment screenshot). Let me know what you find out.
Good luck
Gavin Goodrich
National Instruments
Attachments:
svt_close_swept_sine.jpg ‏35 KB

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