I would suggest that you synchronize AFGs from the same series, like the AFG31102 and 31052, but it is possible to sync an AFG31000 to an AFG3000. To sync these instruments, you will need to follow the instructions for each individual AFG series to setup the respective units. The 31000 and 3000 AFG series use the same connections, but they have different processes to setup the connection. You will likely also need to input a decent amount of Trigger delay on the master AFG using the AFG31000.