Simulate signals wired to the DAQ assistant for USB-6009 device


I'm trying to send a signal to the DAQ Assistant Express VI.  I watched the movie "Generating a Signal" on the Web site of NOR ( and I have my Signal simulate connected directly on the DAQ Assistant, as shown in this film.  In my case, the DAQ Assistant sends the signal to a device USB-6009.

However, I received this message:

Error-200077 occurred to the DAQ Assistant
Possible reasons:

Requested value is not supported for this property value. The value of the property may be invalid because it is in conflict with another property.

Property: SampTimingType
asked the value: Sample clock
You select: On-demand

If I select 'On Demand' in my DAQ assistant and run the vi everything works beautifully.  However, I need my DAQ assistant to be configured to generate a waveform AC continuous, not output a single alternating current rippling.

What happens here?  I did not have this problem before on other devices of NOR. I am using LABView 2010.

Please answer.

Thank you.

double post

Tags: NI Hardware

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