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SECTION 3
Oaemtion
When the lock is ON, most front panel keys are
disabled, and the corresponding
operating
modes cannot be changed. However, both
LOCK and FCTN OUT ON/OFF are still opera-
tional when the lock is ON. In addition, sweep
control inputs from appropriate BNC connectors
remain enabled.
Lock ON/OFF can also be programmed over the
GPIB with the "LCK" command, and GPIB pro-
gramming is not disabled when the lock is on.
You can return the unit to local with the LOCAL
key even when the lock is ON. However, you
cannot return the instrument to local with the
LOCAL key when the GPIB LLO (Local Lockout)
command is in effect.
Existing parameter values, such as amplitude or
phase, can be displayed by pressing appropriate
keys when the lock is ON. The liquid crystal dis-
play will indicate "LOCK" in the position where
the modification step size is normally indicated.
Also, parameter names will not flash, and the
cursor will not be displayed.
PRST (Preset)
rsm1
The PRST key recalls the factory default preset
operating parameters. Refer to the specifications
in Appendix A for a summary of preset parame-
ter settings.
DSPL (Display: Phase Shifier main parameter dis-
play)
DSPL displays the following Phase Shifter main
parameters simultaneously:
Signal output ON/OFF (blank for ON)
Phase shift
Amplitude
DC offset
Waveform
Oscillation mode
Sweep mode (blank for normal oscillation)
Note that parameters cannot be programmed
while the main parameter is displayed; you must
press the appropriate parameter keys before set-
ting parameters.
0
11
AM IN @NC
Connector)
This BNC plug is for the Amplitude Input signal.
When the input signal is &l volt, the modulation
factor is 100%.
0
12
SYNC
OUT
(BNC Connector)
This BNC connector outputs the TTL level SYNC
OTJT waveform signal.
0
13
FCTN OUT
Connector
This BNC connector outputs an analog type sig-
nal from the waveform output. The maximum
output voltage range from this connector is rt15
volts/no load. The output impedance is 5OQ.
3.2.6
Rear Panel Description
FCTN OUT ON/OFF (Signal oufput ON/OFF)
FCTN OUT turns the Phase Shifter output off or
on. Each time this key is pressed, ON/OFF will
toggle to the opposite state.
When FCTN OUT is OFF, the FCTN OUT signal
will be open-circuited. The SYNC OTJT signal
will be identical to the output when FCTN OUT
is set ON.
The liquid crystal display will indicate "OFF" in
the upper left corner when the Model 3933A is in
the FCTN OUT OFF mode (except in the SHIFT
or REMOTE modes).
Note that the factory default setting for FCTN
OUT is ON at power on.
The Model 3933A rear panel contains five BNC connec-
tors, two D-type connectors with 36 pins, and one D-type
connector with 24 pins. Four BNC's are TTL level signals,
one BNC is analog, and the three D-types are digital sig-
nals. All BNC signals are directly associated with SWEEP
signals.
The following paragraphs describe, in detail, the connec-
tors and other aspects of the Model 3933A rear panel,
which is shown in Figure 3-7.
3-11
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