Event at a specific moment of a data acquisition

Hi!
I'm trying to create a VI which should perform data acquisition during which an event should happen.
The full problem is:
I have to do data acquisition (sampling rate up to 100000 samples/sec) of the voltage of a deformed 60 Hz sine wave signal. This data acquisition is saved into a file (Excel or DIAdem compatible) and is not displayed to the user of the VI in real-time (no worrying about displaying a graph). The problem is that after a fixed number of periods has been acquired, at a specific angle of the ideal sine wave (0° being the beginning of the sine wave, 90° the positive maxima...), a digital signal has to be sent to modify part of the circuit we are analysing, while continuing to gather data. I know that using an analog trigger, I can find a 0° point easily, then, knowing the sampling rate and the input signal's frequency, I know the number of samples to wait before the angle. What I don't know though is how to do this event at that specific moment without interrupting the data acquisition.
I am using LV7.1 with a NI-6110 DAQ device configured with NI-DAQmx. If you need additionnal information to answer, then just ask me.
Thanks!

Hi Maxime-
I'm not sure why your counter would be counting too fast, but it might have something to do with the comparator circuit. Are you able to count edges successfully with your counter? I would suggest using the LabVIEW shipping example "Count Digital Events.vi" that can be found by accessing Help>>Find Examples in LabVIEW and then browsing to Hardware Input and Output>>DAQmx>>Counter Measurements. You will need to connect your comparator output to the source input of the counter.
If this VI works for you then I have another suggestion along the lines of Kevin's earlier suggestion to use two counters. The counters on your board can be configured to output a pulse once the counter reaches your Terminal Count (i.e. the highest value the counter can reach before rolling over to zero). Your PCI-6110 has 24-bit counters, so the terminal count will be 2^24-1 or 16777215.
By using the first counter to count zero crossing events from your comparator and setting the initial count to be a certain number of counts less than the Terminal Count you can output a pulse after a user-specified number of rising edges. This output can then be routed to trigger pulse train generation on the second counter of specified frequency and length. Finally, you can route this generated pulse train to be the external clock for your analog input operation.
I have attached a modified edge counting example that shows how to route the terminal count to a pin that can be used to trigger the pulse train on the second counter. For an example of AI operation with a counter-generated pulse train, check out "Multi-Function-Ctr Retrigg Pulse Train Generation for AI Sample Clock.vi" in the Hardware Input and Output>>DAQmx>>Synchronization>>Multi-Function folder in the Example Finder.
Thanks-
Tom W
National Instruments
Attachments:
Count Digital Events with Output Pulse.vi ‏64 KB

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