Set the amplitude of a generated square waveform

[Jacopo]

Hi everybody,

I write you again, hoping you could give me an useful idea for my problem as you did the last time.

I`ve written a program to generate a square waveform with duty cycle sweeping and it works.
The only thing I`m not able to do is to set the peak to peak amplitudite of the waveform and its offeset

In the end of the post you can find it.

I`m quite sure my problem is really easy to solve but I don`t know how!!!

Thank you really much for the help!




Message Edited by Jacopo on 03-31-2008 04:41 AM

Message Edited by Jacopo on 03-31-2008 04:43 AM

[JB]

The amplitude or the offset of a counter output can't be changed ! But you could solve your task by using an analog output.

Which DAQ board do you use ? Has it an analog output ?

[Jacopo]

Hi,

my DAQ board is PCI 6259.

I think I could use the analog output to generate the  square wave with the offset and the amplitude I want, but is still possible to
change the duty cycle as I do in the program I posted ?

I ask you, cause my final purpose is to have a square waveform with the duty cycle changing in a continuos way...

[Filippo_Persia]

Dear Jacopo,

JB correctly pointed out that counter output are digital TTL so you can't change amplitude nor offset.

However you can change Output frequency in analog output tasks and rewrite new analog waveform while the task is running (M series board 62xx are needed).

Please check the examples Hardware InputAndOutput>>DAQmx>>Analog Generation>>Current>>Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi and Cont Gen Voltage Wfm-Int Clk-Variable Rate.vi you should be able to get all the information you need from them.

Best Regards