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Model 5344$
Operation and Programming
SECTION III
ION AND PIOGRAMMI
3-2.
This section contains descriptions of operating characteristics and modes, operating proce¬
dures, descriptions of the front and rear panel controls and indicators, and Hewlett-Packard Interface
Bus (HP-IB) programming information.
3-3.
The 5344A is a companion instrument for the 5342A or 5343A Microwave Frequency Counter.
The operation of the 5342A/5343A Counter should be understood before attempting to operate the
5344S system. For complete information on the 5342A or 5343A Microwave Frequency Counters,
refer to the Operating and Service-Manuals for these instruments. When appropriate, the 5344A/S
operating information is supplemented with 5342A/5343A operating information where necessary
for clarity.
3-4.
The 5344A Source Synchronizer in combination with either a 5342A or 5343A Microwave
Frequency Counter allows phase locking of a signal source to any frequency (1 Hz resolution) in the
high operating range of the counter used. The desired lock frequency is selected via the 5344A
keyboard and the signal source must be set within the specified capture range of that frequency in
order for the 5344A to achieve lock. This can be automatically achieved if the source is an HP 8350A or
an HP 8620C with Option Oil.
3-5.
The counter is fed a sample of the source signal to be locked. The 5344A generates a correction
signal for the signal source by comparing the phase of the down converted signal in the counter with
an internal crystal controlled synthesizer. The synthesizer may be swept over narrow ranges (40 MHz
maximum), and the signal source will follow remaining phase-locked. For wider sweeps with an
8620C or 8350A, the source may be locked at the start of the sweep and the correction voltage held
constant throughout the rest of the sweep (Lock and Roll mode).
3-6.
User interaction with the system is through the 5344A front panel, which contains a keyboard,
11-digit scratchpad display, and RPG (rotary-pulse-generator) knob. All 5344S functions except Auto
Lock may be controlled remotely via HP-IB.
3-7.
The 5344A is attached mechanically to the 5342A or 5343A counter and electrically to the
counter's microprocessor bus, IF and 10 MHz outputs.
3-8.
MODES OF OPERATION
3-9.
The 5344S has four modes of operation. They are CW, CF/AF, Start/Stop, and Lock/Roll.
Each mode can be used in Manual Lock or Auto Lock, as described in the following paragraph.
3-10.
MANUAL LOCK MODE!
3-11.
Manual Lock requires the signal source to be manually tuned to within capture range of the
selected frequency. If the 5344S is used with an 8350A or 8620C with Option 011, the 5344S can
automatically tune the sweeper to the selected frequency (Auto Lock.)
3-1
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