how to use two DAQ assistants in the same VI?

[Billntinas]

Hi everyone,

I used two DAQ assistants in order  to create two output voltage signals because I want to control a chopper with variable frequence and a monochromator but there is an error in the code. Can you help me how I could do it. I am not familliar with labview a lot since I started learning two weeks ago.

thank you in advance

Vasileios

[Dennis_Knutson]

Did you search the board/forum for the error code or message that you are getting. It's a quite common error. Quite simply, you cannot use two separate DAQ Assistants. You use one that is configured for two channels. Simply click on the 'Add Channels' button and use the Merge Signals function to combine the two waveforms from the Simulate Signals functions.Both signals must have the same sample rate.