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Step Control Slave
Function Group
FREQUENCY
Menu Map
2
Description
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-1 shows the connections required for a two-tone system. On
the message line, the status message
EXT REF
appears indicating the
swept signal generator has an external timebase reference. The start
and stop frequencies of the slave can be oset above or below those
set on the master for xed oset t
wo-tone measurements.
To synchronize prop erly for swept oset measurements, the
0to10volt sweep ramp must b e actively sweeping on the slave. If a
CW frequency is selected as the xed LO frequency
, the sweep ramp
is deactivated and the proper synchronization do es not o ccur. Select
a center frequency with zero span to keep the slave's voltage sweep
ramp active and ensure prop er 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 sw
ept
signal generator's step size to match the number of p oints displayed
on the analyzer. Since the slaveswept 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
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Step Swp Pt Trig Ext
on the slaveswept 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 b ecause the analyzer does not stop the
sweep precisely on the last point and if the sweep times are set to
the same value, the system maylock up. Use the following formula
to determine the slave's sweep time for a system controlled byan
analyzer.
SweepTime
Master
2
1.03 = SweepTime
Slave
Setting the slave's sweep time 1.03 times greater, the master's sweep
time results in the slavesweep being 97% of the set v
alue. When a
reduced sweep is not acceptable, sweep times can b e set to the same
value. Lock ups can be cleared by reentering the slave's sweep time.
For xed-oset ramp sweep measurements, the same sweep time must
S-66 Operating and Programming Reference
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