Agilent Technologies 89410A Operator's Manual page 91

Using Digital Demodulation (Opt. AYA)
5.
Set up the trigger:
Press [ ], [ ], [ ], [ ], [ ], 1, [ ].
Trigger trigger type internal source return ch1 delay ms
This example uses a signal which has been supplied from the Signals Disk.
When you supply another signal to the channel 1 input you need to select
appropriate center frequency, span, range, and triggering parameters prior
to demodulating the signal.
The spectrum of a digitally modulated carrier before demodulation.
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