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Trigger Timing Issues

Hey all,
 
Sorry to bug the forums again, however I have a quick question. Let me first explain the problem... I am working on a proton accelerator beam, and trying to take an optical profile of it using a CCD camera and an NI PCI 1410 DAQ card. The problem lies not in the frequency of pulses, but rather in the duration of the pulse (about 150 micro seconds), and it fires about 20 times per second.
 
I figure my best chance of taking a picture of it when firing is to externally trigger my camera with the same clock running the accelerator, however, I am afraid I dont know whether it will trigger the last completely scanned image to be forced into the buffer or the one that is presently being scanned? With only 150 microseconds does it even matter, or do I have no chance either way... Guess I just dont know how long it takes my camera to acquire an image.
 
Ok, so the real question... I thought I read somewhere about an instantaneous acquisition, versus a normal one. One of these grabs the image already sitting in the buffer while the other one will grab the image presently being taken (when its completed). Any thoughts as to how one might access this option through labview or some other means?
 
Thanks much,
-Dave
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Dave,
 
Thanks fot your post.  It is possible to extract the images from the buffer during a continuous acqusition.  Use the IMAQ Extract Buffer command to return the most recent images in memory on your IMAQ card.  I am not sure however if this will be fast enough for the time requirements you have.  I am going to verify the minimum pulse width required for a trigger on the 1410 by an R&D developer and get back to you (it is not listed anywhere).
 
Thanks,
 
Scott Savage
National Instruments
Applications Engineering
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