Hi B Man,
My advice is to stay away from using the
DAQAssistant.It is much more limited in functionality than creating a
DAQmx analog output task. Using an analog output task you can control
this a couple ways. One way is to perform this action with software
timing. In this case you can write a new single peiod of a sine wave to
the output each iteration of the loop. You initialize an array that
stores voltage values that will corrospond to the "ramp" you'd like to
use for the amplitude of your sine wave output, and each iteration of
the loop input the next voltage value of the array into the amplitude
input of the generate sine VI. The output of this VI will be a waveform
that is fed into the DAQmx write.vi. Attatched is a simple example that
I wrote that loosely demonstrates this idea. In order to get the full
functionality you're looking for, you will have to manipulate this
example.
If you are looking for the output to ramp back
down from the maximum voltage value in the array, you can have a case
structure that checks to see if you're at your max voltage and then
indexes through the array backwards, or simply uses another array that
has the ramp signal that is ramping down. This should get you started.
Chris N White
High Speed Products Group
