How to get waveform data in specific duration?

[cyborg123]

Hi,

I have an analog waveform and I want to get the data in 20ms range (Like, 0ms-20ms then 20ms-40ms .........)

How can I get that?
I have used ''get waveform subset.vi'' but it only takes the first range(0-20ms).

N.B. I already have the total waveform data, I just need to get data in range & save it.

Thanks.

[RavensFan]

Show what you've done so far.  With Get waveform subset, you need to specify the start point and the duration.  Did you wire in both of those inputs?

[cyborg123]

Yes, I wired both inputs. 

Here is the vi.

thanks.

[RavensFan]

But you wired them with constants!  So of course you'll get a constant output.

If you want the waveform to change, you need to update the start time in every iteration.  (0, .02, .04, .06, ........)

[cyborg123]

Thank you for your help