HP 8360 B Series User Manual page 373

Function Group
Menu Map 2
Description
S-66 Operating and Programming Reference
FREQUENCY
This softkey lets you designate the swept signal generator as the slave
in a dual swept signal generator measurement system. A dual swept
signal generator system (two-tone measurement system) facilitates
accurate device characterizations by providing one timebase reference
for both sources.
Figure S-l shows the connections required for a two-tone system. On
the message line, the status message
swept signal generator has an external timebase reference. The start
and stop frequencies of the slave can be offset above or below those
set on the master for fixed offset two-tone measurements.
To synchronize properly for swept offset measurements, the 0 to 10
volt sweep ramp must be actively sweeping on the slave. If a CW
frequency is selected as the fixed LO frequency, the sweep ramp is
deactivated and the proper synchronization does not occur. Select a
center frequency with zero span to keep the slave's voltage sweep
ramp active and ensure proper synchronization.
For synthesized step sweep measurements, set the number of
sweep points on the slave the same as on the master swept signal
generator. If the master swept signal generator is connected to a
network analyzer, the analyzer automatically sets the master swept
signal generator's step size to match the number of points displayed
on the analyzer. Since the slave swept signal generator is not
connected to the analyzer, set the slave to match the master swept
signal generator. Allow the master to trigger the slave's steps. Set
Step Swp Pt Trig Ext on the slave swept signal generator.
For ramp sweep measurements, on the slave set the sweep time
equivalent to the master swept signal generator. If the master is
connected to a network analyzer, the slave's sweep time is slightly
longer than the master's because the analyzer does not stop the
sweep precisely on the last point. Use the following formula to
determine the slave's sweep time for a system controlled by an
analyzer.
For fixed-offset ramp sweep measurements, the same sweep time must
be set on both the master and the slave. Since the master's sweep
time is typically determined by the measurement configuration, set
the slave to match the master.
For more accurate ramp sweeps, select
both the master and slave swept signal generators. When this feature
EXT REF appears indicating the
Swp Span Cal Always on