samples per channel and the number of samples per channel
in my DAQ mode samples finished program, there are two screws: timing and read.vi DAQmx DAQmx.
I have to set the parameter to "samples per channel" DAQmx timing.vi and 'number of samples per channel' on DAQmx read.vi... Is there a relationship between these two?
My laser runs at 1 K Hz. I want to go to the wavelength, wait for a number of shooting lasers, read the data and move on to the next page...
Thank you
Lei
In your case, the VI will acquire the lesser of either:
The "samples per channel" that you have defined on the timing DAQmx VI
-OR-
The number of iterations of your for loop (N) times the 'number of samples per channel"that you have defined on the DAQmx read VI
The "samples per Channel" VI DAQmx of timing for a finite acquisition dictates how many samples the DAQ hardware should acquire in it's onboard buffer before indicating that the acquisition is complete. "The number of samples per Channel" on the read DAQmx VI dictates how many samples the DAQmx driver must return buffer on board the aircraft to your application.
Let's say the "samples per channel" on the calendar DAQmx VI is set to 50. Thus, the card will acquire 50 samples and place them in the edge of the buffer, then stops. Suppose we have the 'number of samples per Channel"on the DAQmx reading VI the value 3 and what we call the VI in a loop For which runs 10 times. Thus, every time the DAQmx lu VI is called, it will wait until there are at least 3 samples in the buffer, and then return these three. We call the VI a total of 10 times, then we will answer 30 total samples. Thus, the last 20 samples acquired the card remains in the buffer and are destroyed when the task is disabled.
Now let's say that we increase the "number of samples per Channel" on our DAQmx Read VI at 10. VI Read will wait until 10 or more samples are in the buffer, and then return these 10. Thus, we will be back all 50 samples map acquired by the 5th iteration of the loop For. The 6th time we call him VI DAQmx Read it expires, because there will never be another 10 samples in the buffer, and the VI returns a warning.
This clarifies things?
The purpose of this behavior is to allow you to both set the total number of samples that the DAQ hardware will acquire and also control how much of these samples is returned whenever you call the DAQmx Read VI.
Kind regards
Tags: NI Hardware
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