If you need triggered zero span (I/Q) acquisitions, I highly recommend the BB60C. Triggering on the SA44B is very limited and it is easy to lock up the device if you are not very careful.
We intentionally do not trigger sweeps, to avoid the situation where people try to sync a swept signal generator with our spectrum analyzer, because a stepped FFT-based spectrum analyzer, even perfectly synced, is only actively looking at the spectrum a fraction of the time.
The solution is to use our tracking generator, which has firmware to switch frequency at appropriate times for the architecture.
