Signal Generation in Labview 8.6

[Sanjeevs]

I am using NI cDAQ-9172 with a NI 9263 analog output module. 

I am trying to generate a 2 continuous sine waves whose amplitude,frequency and phase difference must be changed dynamically on the fly.   I used to DAQ assistant to create 2 Voltage output channels.  The DAQ assistant that appears does not sem to have any outputs from which I can take the signal out.  Please let me know how I can work around this problem. 

 

[Dennis_Knutson]

The signal output is coming out of whatever hardware you have. If you need to check the signal, hook a scope to the outputs or wrap the output back into a couple of analog inputs.

[Sanjeevs]

I mean I am using LabVIEW itself to generate the signals. I do not have any external signal generating devices

[GovBob]

DAQ assistant is used to configure your hardware for input and output.

"I am using NI cDAQ-9172 with a NI 9263 analog output module."

You would use DAQ assistant to configure I/O for these modules.

If you are just wanting to simulate signals you are using the wrong function. If you have a block diagram open, open the functions pallette and click search. In the search field type 'waveform generation'.

Hope this helps. 

[dansch]

Hello Sanjeevs,

As Dennis and GovBob mentioned, the DAQ Assistant is used to control hardware DAQ devices. If you wish to simply generate some signals, the Simulate Signals Express VI should work nicely. This VI can be found in the Functions palette under Express » Input » Simulate Signal. It is also shown in the image below, where the Simulate Signal VIs are creating the waveforms and the DAQ Assistant VI is taking the data and sending it to the board to be physically output.

Hope this helps,

Message Edited by dansch on 03-09-2009 10:50 AM