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Mode! 5344S
Operation and Programming
3-32.
A marker signal is generated for any 5344S marker frequencies selected as described in
paragraph 3-45.
3-33.
Lock/Roif in Auto Lock
3-34.
The 5344S attempts to lock the signal source to the selected Lock/Roll Start frequency in
the same manner as for CW Auto Lock. If successful, the 5344A holds the FM correction signal
constant and sends a sweep trigger signal to the sweeper to start the sweep. It then waits for an
end-of-sweep signal (derived from the sweeper's SWEEP OUT-IOV RAMP) and repeats the
lock/trigger/wait cycle. The sweeper controls must be properly set to achieve the desired sweep
from the locked starting frequency. The 5344S only sets the sweeper close to the desired starting
frequency via HP-IB in this mode.
3-35.
Auto Lock/Roll will operate only with the 8350A Sweep Oscillator.
3-36.
In Lock/Roll, the signal is locked only briefly at the start of each sweep. It is possible for the
sweeper settings to be changed during the unlocked portion of the sweep such that the starting
frequency is changed by some near multiple of the selected 5342A/43A local oscillator
frequency. This would result in lock being regained at the end of the selected sweep, even
though the frequency is nowhere near that desired (pressing Reset causes the 5344S to re-lock to
the desired frequency). In Lock/Roll, the LOCKED light is normally lit continuously even though
the signal is only locked at the start of each sweep.
3-37.
LOCKED SWEEPS CF/AF arid START/STOP
3-38.
Sweep Time for Locked Sweeps
3-39.
Sweep time can be selected for the two Locked Sweep modes, CF/AF and Start/Stop. The
sweep time range is 10 ms to 100 s. The sweep mode may be Single or Continuous as determined
by the ACQUIRE key (refer to under Front Panel Features, paragraph 3-102).
3-40.
Sweep increment
3-41.
During locked sweeps (CF/AF and START/STOP modes) the 5344S is actually stepping the
signal source to a new locked CW frequency every 10 microseconds in phase continuous steps.
Normally the step increment is so small that the sweep appears to be continuous. The actual
increment is given by the following formula (for START/STOP mode use START-STOP in place of
AF):
INCR =_ei_
SWEEP TIME/10 ms
3-42.
For example, if AF = 40 MHz and SWEEP TIME = 10 ms, INCR = 40 KHz. A fixed increment of 80
KHz is used for locked sweep retrace.
3-43.
MARKERS
3-44.
The 5344A has the ability to generate 4 separate markers. The markers are settable across
the swept band. The following paragraphs describe the use of these markers.
3-45.
Markers are generated by the 5344S only in CF/AF and START/STOP modes. A marker
signal is then generated for desired 5344S marker frequencies in the swept range. The markers
can be disabled by setting them to 0, as described in Front Panel Features, paragraph 3-102.
Setting any Marker below 500 MHz causes that marker to default to 500 MHz. Setting any marker
above 18 GHz (5342A)or above 26.5 GHz (5343A) causes that marker to default to 18 GHz or 26.5
GHz. If the 5344S is in Subharmonic Mode or Frequency Offset Locking, the limits are 10 MHz to
99.999999999 GHz.
3-4
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