sample number dynamically change

[heang]

hello

i have done the signal acquisition. to prevent the data is read before it was placed in the buffer, is it advisable to change dynamically the sample number?

i am using digital pulse to trigger the analog voltage acquisition. by using elapsed time, i try to set the sample number according to the digital line. the elapse time continue running as long as any of the digital line is 1. then it will be reset.Elapse time is then multiplied by 1000 to determine the sample number in analog signal acquisition.

note that the digital line happens before analog signal.

what problem is that the number of sample is seem changing. but the what i can see from the number of sample is not changing.

what really happens?i have manually controled  the number of sample, the acquisitioin of analog signal can be seem changing. however using the digital line to trigger the elapse time, the number of sample is not changing.

how can i solve this problem.


thanks

here attached with the vi

regards

[Dennis_Knutson]

It's not clear to me at all what you are attempting to do. The only think that is clear is that the data acquisition cannot begin until the while loop finishes. That is because you have place the daq outside the while loop and you have dataflow between the while loop and the daq.