Eyal S.
2008-08-13 18:40:05 UTC
Hi, I'm using 2 cards for a specific application. By changing the voltage on the analog outputs (I use both analog outputs) of a pci-6251 I move a scanning mirror to a desired position. After I find the desired position I just leave the voltage output as it is. At this point I use a second card to count photons (not a NI card). My problem is that the second card doesn't run properly when the pci-6251 is supplying voltage simultaneously. When I turn off the program that controls the voltage output on the pci-6251 the second card works fine. I realized that both cards compete for the computers resource usage. When I don't use the pci-6251 I can have as many as 2M counts/sec on the other card and when I do use the pci-6251 I can only have ~ 80k counts/sec. I don't understand why the pci-6251 uses so much of the computers resources just to keep a constant voltage output. Is there a why to solve this problem so the 2 cards work in harmony with each other? Thanks for the help,Eyal