Agilent Technologies 54503A User's Guide Page 246

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246 Chapter4
Key Function Descriptions
Key Descriptions
LVL POL POS NEG Selects the polarity for turning the gate on when
using level triggering for a gated measurement. If
(POS) is underlined, the gate will be on while the rear
panel trigger input is high. The gate will be on while
the trigger input is low if (NEG) is selected. The gate
delay and gate length functions are not available when
level triggering is used.
NOTE When the polarity of the gate trigger is set, the instrument normal
sweep trigger will always be set to the same polarity.
Front-panel key access:
SWEEP
MAN TRK ADJ Allows you to adjust the frequency of the
tracking-generator oscillator manually using the step
keys or knob. The tracking adjust is tuned to maximize
the amplitude of the trace.
Once activated, either the coarse orfine adjustment can
be made. COARSE TRACK ADJ can be adjusted in
digital-to-analog-converter (DAC) values from 0 to 255
using the step keys or data keys. FINE TRACK ADJ can
be adjusted from 0 to 255 (DAC values) using the knob.
Tracking error occurs when the output frequency of the
tracking generator is not exactly matched to the input
frequency of the spectrum analyzer. The resulting
mixing product from the spectrum analyzer input
mixer is not at the center of the IF bandwidth. Any
tracking errors may be compensated for through
manual adjustments of the tracking generator
oscillator, or through an automatic tracking routine,
TRACKING PEAK.
Front-panel key access:
AUX CTRL
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