Pulses input

[murali_vml]

Hi,

I have a system where my sensor requires inputs in terms of pulses,presently i'm using counter channel of 6024E card and generating pulses for ceratin frequency.what i require is that ,since pulses are going at consistent rate.I need to skip some 2 or 3 pulses in between and then transmit again these normal pulses(idea is simulating the effect of noise on that signal and observe system behaviour from it).Can i achive it with the Counter channel or do i need to take any alternate route?

Thanks

Murali

[Abhinav T]

Murali,

There are 2 ways to accomplish this:

- stop and re-start your task in software to create that gap in between pulses
- create a finite counter output that triggers off a slower clock, this may not be possible with just the one card you have
- use the digital line to create a custom digital waveform

Abhinav T
Applications Engineer
Naitonal Instruments

[murali_vml]

Thanks for your reply Abhinav.

-If i stop and restart the task,i doubt about the time it will take for reconfiguring the hardware and transmittting this pulses again.

can i simply stop  it and start the task (just arm the counter by start task.vi without doing hardware configuration).

one more option i was thinking of is changing the freq on the fly,but can i input a freq of 0Hz for pulses generation to counter channel.If this is possible then i may think of configuring a certain freq first and in between configure it to 0 and then retransmit the original freq pulses.

Is there any program readily available for configuring Freq on fly?
If available, can u send it as it will helpful in trying it out.

- second option of achieving it by a finite counter is not feasible for me at present as i have only single hardware.

- Even i was also thinking of using digital line as a last option

-Murali

[Abhinav T]

Murali,

The only thing I could possibly dig up is the attached code. It uses Pulse Width Modulation to control the high time and low time. I am working on making an example that start and stops the task, will post when I come up with anything.

Abhinav