Instrument drivers are generally just sub VI's that are made to work for a specific instrument. If you put one of those VI's down on your block diagram and then double click on it, that VI should open up so that you can see how it works. If you dig down into each sub VI, you will probably find simple VISA write and reads. To make the instrument driver work with the 5150b, you will have to look in the owners manual to see which commands you will need to use and are they different from the other 2 instruments. If they are different, then you iwll have to add some VISA functions to your driver.
Scott G.
AE Specialist
National Instruments
