Well the first thing I see is that unless you are talking to the instruments through two seperate gpib cards there is no way to start them simultaneously--at least doing it the way you are trying to. The problem is that while LV is multitasking, the gpib bus is not. It has to complete the transaction with one instrument, then do the other one.
Now, depending on the instrument's capabilities, there is one possibility. If you can program the instruments to start the generation when they see a gpib trigger. You can setup both instruments and then start them with a single trigger.
Finally, you don't have any of the error clusters connected. This is an open invitation for a program that just stops working and you don't know why. Always, always, always hand
le errors. Do this and your programs will always be able to tell you why they are unhappy. Which can keep you from being unhappy.
Mike...
