HP 8360 User Handbook Manual page 362

Start Sweep
Trigger Ext
Function Group
Menu Map
Description
Programming Codes
See Also
Step Control
Master
Function Group
Menu Map 2
Description
SWEEP
7
When this softkey is selected, the synthesizer waits for an external
hardware trigger to trigger a sweep. Connect the trigger pulse to
TRIGGER INPUT. It is activated on a TTL rising edge. An asterisk
next to the key label indicates that this feature is active.
SCPI: TRIGger:SOURce EXT
Analyzer: T3
FREQUENCY
This softkey lets you designate the synthesizer as the master control
in a dual synthesizer measurement system. A dual synthesizer
system (two-tone measurement system) facilitates accurate device
characterizations by providing one timebase reference for both
sources. This technique reduces instabilities from temperature or line
voltage fluctuations, or drift.
The synthesizers can be operated in either ramp sweep or step
sweep modes for both fixed offset and swept offset measurements.
Figure S-l shows the connections required for a two-tone system.
HP 8360
User's Handbook