Edge counting with digitial pause trigger

[AdamB]

Hi there,

You have set a finite number of samples to be outputted and set this value to 1.

This will cause the program to output a single sample and then the task will stop.

If you increase the numSamples to say 10000 what happens then?

AdamB

[Rajaram]

Hi there,

I am not getting any samples if I have number of samples as 1, 1o or even 100. For me it s like no pulse is being generated with finite pulse.

Thanks

[AdamB]

Hey,

Have you put a scope on the counter output?

Are there any errors being generated from the code?

AdamB

[Rajaram]

Hi

Yes, Actually there is not errors being generated. But also I think no pulse is also generated when I give finite pulse, Bcoz I have given the counter output as trigger source,

If it s continuous signal, I can get the trigger source to get some signals from the pulse, in other case If I have finite signal I am not getting any signal in trigger source, Hope my program will explain how I have related the tasks.

Thanks

[AdamB]

Have you looked here?

http://zone.ni.com/devzone/cda/epd/p/id/2415

AdamB

[Rajaram]

Hi again

I had a look at that program, I have used same method of defining and using the functions. But It s not workin in Finite mode in my program. If possible please have a look at the program.

Thanks

[AdamB]

Hey there,

I've tried the code and it works fine on the outputs.  I have a scope attached and the finite samples are being produced.  I used a numSamplesPerChannel set to 10000 and the output lasted 100 seconds and then stopped.

AdamB

[Rajaram]

Hi,

what value u ahve given for frequency and duty cycle?  Could you please try the same frequency and try it for 1 samples? or 10 samples?

Thanks

[AdamB]

Hey again,

I have kept the default values you have on the form.

It works perfectly with 1, 10, 100, 1000 and 10000.  They produce the finite number of pulses and then stop producint pulses alltogether.

Thanx

AdamB

[Rajaram]

Hi there,

This is strange, After writing the program and tried it running with finite samples of 1 and 10, it stopped exactly after reaching the sample specified. But now I try the same values, but it s not working out.  I can explain the problem.

I start generating the pulse with frequency : 1 Hz and Duty cycle : 0.9 with the counter0Internal output as trigger source, with trigger level as high and rising edge.

Number of samples specified was 30. It works ok until it reaches 23 samples then it loses the pulse generation signal and ignore the trigger completely. What should be the problem?

Thanks