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Model 5344S
Operation and Programming
3-22.
The 5344S attempts to lock the signal source to the selected Lock/Roll Start frequency in the
same manner as for CW Manual Lock operation. If successful, the 5344S 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-10 volt ramp) and repeats the
lock/trigger/wait cycle. The sweeper controls must be set properly to achieve the desired sweep
from the locked starting frequency, in Lock/Roll mode, the LOCKED light is lit continuously even
though the signal is only locked at the start of each sweep.
3-23.
AUTO LOCK MODES (SYSTEM CONTROLLER)
3-24.
The 5344A contains a portion of the HP-IB code set for the 8350A and 8620C Sweep
Oscillators. This gives the 5344S the ability to program many of these sweeper functions as if it
were a controller (by IEEE 488-1978 terminology the 5344S is a System Controller). For instance if
the CW frequency selected on the 5344A front panel is 10 GHz, the 5344A would automatically
program the sweeper to a CW frequency of 10 GHz, provided the sweeper's RF Plug-in has that
range. Paragraph 3-177, System Controller Mode, gives the IEEE 488-1978 details concerning this
feature. The following paragraphs describe the basic operation of Auto Lock.
Since the 8620C cannot be programmed for specific frequencies
in the Start/Stop mode, the 8620C cannot be used in Auto
Lock/Roll.
3-25.
CW in Auto Lock
3-26.
The 5344S attempts to lock the signal source to the selected CW frequency. If the signal
source is too far from the desired frequency, the 5344S tunes the sweeper via HP-IB to bring it into
lock. When lock is achieved, the LOCKED annunciator is turned on. If lock is lost, or cannot be
achieved, the 5344S turns off the LOCKED annunciator and attempts to adjust the signal source
via HP-IB to regain lock. If the signal source cannot attain the desired frequency, an error
indication is displayed on the 5344A.
3-27.
CF/AF in Auto Lock
3-28.
The 5344S attempts to achieve a locked sweep of the signal source from the selected CF -
AF/2 to CF + AF/2 using the SWEEP TIME selected by the user. If the signal source is too far from
the desired frequency range, the 5344S tunes it via HP-IB (as in CW mode). When lock is
achieved, the LOCKED annunciator is turned on. If lock is lost, the 5344S turns off the LOCKED
annunciator and attempts to adjust the signal source via HP-IB to regain lock. If thesignal source
cannot attain the desired frequency, an error indication is displayed on the 5344A. The sweep
must not cross 500 MHz, 650 MHz, or 800 MHz, as described in paragraph 3-50.
3-29.
A marker signal is generated for any 53445 marker frequencies selected as described in
paragraph 3-45.
3-30.
Start/Stop in Auto Lock
3-31.
The 5344S attempts to achieve a locked sweep of the signal source from the selected
START to the selected STOP frequency using SWEEP TIME selected by the user. If the STOP
frequency is less than START, or STOP - START is too large, an error indication is displayed on the
5344A. If the signal source is too far from the desired frequency range, the 5344S tunes it via HP-IB
(as in CW mode). When lock isachieved,theLOCKEDannunciatoristurnedon. If lock is lost, the
5344S turns off the LOCKED annunciator and attempts to adjust the signal source via HP-IB to
regain lock. If the signal source cannot attain the desired frequency, an error indication is
displayed on the 5344A. The sweep must not cross 500 MHz, 650 MHz, or 800 MHz, as described in
paragraph 3-50.
3-3
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