Dear all,
I am working with an NI DAQ board (PCIe 6363), and am using a waveform as analog output to control a scanning unit.
Now, I want this analog output to be synchronized with the rising edge of an external TTL signal (the *fire* output of a camera).
To do this, I used the [Cont Gen Voltage Wfm-Int Clk-Analog Start]-template with minor modifications (see attachment with some comments included). Actually, this works, but only if the output waveform is long finished when the next TTL rising edge arrives. What I want, is a rising edge trigger which arrives, say, with 100 Hz, and an almost 10 ms-long waveform which starts with this trigger. Until now, I get it working with a ca. 8 ms-long waveform. It seems to me that the loop in Labview software (see attachment) takes the rest of the time. If I increase the waveform length to 9 ms or more, the loop is too slow and kind of misses the next rising edge trigger.
Unfortunately, I cannot use [continuous sampling] as there is too much jitter in the external trigger.
Is there a way to optimize this problem? For example, is it possible to tell the DAQ board 'put out this waveform every time you receive the trigger' instead of 'put out this waveform when you receive the trigger, then be silent' ? Or is it possible to run two while loops in parallel which alternately wait for the trigger signal and both use the same output channel ? Is there another, better, simpler solution?
Thank you for any pointers,
Peter
