Split frames (rolling image) seen in an acquisition to grab but not an acquisition of wink

I am trying to acquire digital images from a camera Indigo Systems Merlin Mid using a PCI-1422 acquisition card.  The description of the camera on NI is below:

http://sine.NI.com/apps/UTF8/NIPC.product?PID=2084

When I gain using a 'Snap' acquisition, everything works fine, regardless of how many images I acquire.  When I try to grab an acquisition to get closer to the rate of 60 Hz, I get split frames apparently different acquisitions on each image.  The location of split moves vertically down on each acquisition, leading to the appearance of a picture scroll or rolling.  It seems to me that someone needs to adjust the horizontal sync on an old TV button!

This problem is present in LabVIEW IMAQ and MAX.  In both cases Snap works fine, but Grab the scalable results.  I use the .icd file provided by the manufacturer in MAX.  Any thoughts on what could be the problem?

I found that this problem sometimes disappears if you reduce the size of the image being acquired.  In MAX, try to reduce the number of lines in the image by one or two.

Bruce

Tags: NI Hardware

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