Counter/Timer

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No pulses generated!

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Hey!

I am having trouble with generating a PWM signal using a counter channel on our NI-6733 card.

I use the DAQmx VIs to: Create a task (frequency = 50 Hz, duty cycle = 0.07) - set the task to finite samples with a certain number of samples - start the task - wait until they've been written - stop the task (is that actually necessary?) and delete the task.

 

I check the output with an oscilloscope. If I run the VI, only some times the pulse train is generated and sometimes nothing happens.

 

The same happens when I use MAX and create a pulse train with the "test panels" dialog.

 

It seems to me like there's a hardware problem, how can I investigate what's the problem?

 

Does anybody know this issue? Am I doing something wring? Thanks for any help!

Best,

Steve

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Accepted by topic author stevosn

Hey again!

 

This was my bad! The osci was just to slow. Once it was acquiring the signal when the puls was on its high state and the other time it acquired the signal when the pulse had its low state..

 

Cheers!

Steve

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