Agilent Technologies Agilent 33500 Series, User Manual

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Chapter 3 Features and Functions
Output Configuration
3
• For internally-modulated AM , FM , PM , and PWM , the Sync signal is
normally referenced to the modulating waveform (not the carrier) and
is a square waveform with a 50% duty cycle. The Sync signal is a TTL
“high” during the first half of the modulating waveform. You can set
up the Sync signal to follow the carrier waveform by using the
command:
OUTPut:SYNC:MODE {CARRier|NORMAL}
when modulating with internal modulation.
• For externally-modulated AM , FM , PM , and PWM , the Sync signal is
referenced to the carrier waveform (not the modulating waveform)
and is a square waveform with a 50% duty cycle.
• The polarity of the Sync signal may be inverted using the SCPI
command:
OUTPut:SYNC:POLarity {INVerted|NORMal}
• For FSK , the Sync signal is referenced to the “hop” frequency. The
Sync signal is a TTL “high” on the transition to the “hop” frequency.
• For frequency sweeps with Marker Off , the Sync signal is a square
waveform with a 50% duty cycle for the duration of the sweep. The
Sync signal is a TTL “high” at the beginning of the sweep and goes
“low” at the midpoint of the sweep. The Sync signal is synchronized
with the sweep, but is not equal to the sweep time because its timing
includes the re-arm time.
• For frequency sweeps with Marker On , the Sync signal is a TTL “high”
at the beginning of the sweep and goes “low” at the marker frequency.
You can change this behavior with the
OUTPut[1|2]:SYNC:MODE
command.
• You can override normal sync behavior to force Sync to always follow
the carrier waveform. The command for doing this is called
OUTPut[1|2]:SYNC:MODE
; see the Agilent 33500 Series
Programmer’s Reference Help for details.