Agilent Technologies 54503A User's Guide Page 239

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Chapter 4 239
Key Function Descriptions
Key Descriptions
Front-panel key access: DISPLAY
FRAC N FREQ Displays the fractional N frequency corresponding to
the start frequency. This oscillator is used for
fine-tuning the local oscillator.
Front-panel key access:
CAL
FREE RUN Sets the trigger to free-run mode. Sweep triggers occur
as rapidly as the spectrum analyzer will allow.
Front-panel key access: TRIG
FREQ COUNT Activates the frequency counter and displays its results
in the upper-right corner of the screen. This replaces
any current marker readout in that area. If MARKER
NORMAL or MARKER DELTA is already active,
FREQ
COUNT uses that marker mode to read the frequency or
the difference in frequency between two markers,
respectively. If no marker mode is active, pressing
FREQ
COUNT automatically activates MARKER NORMAL.
The counter will only count signals that are displayed
on the screen. Thus, counter accuracy is lost when
using MARKER DELTA when the anchor marker is off
the screen or when either marker is not on a signal. All
signal-counting is done during the retrace time of the
sweep.
FREQ COUNT uses the same marker priority as
described under the MARKER NORMAL softkey.
FREQ
COUNT cannot be used on traces that are being viewed,
in stimulus-response (tracking generator)
measurements, or in video trigger.
FREQ COUNT also accesses amenu of additional counter
functions, which are as follows: COUNTER ON OFF,
COUNTER RES, MARKER NORMAL, MARKER
DELTA, PEAK SEARCH, and NEXT PEAK.
Front-panel key access:
FREQ COUNT
FREQ DIAGNOSE Displays a menu of diagnostic functions, which allow
various internal parameters of the analyzer to be
retrieved. Refer to the
CAL menu tree for a list of all of
the frequency diagnostic softkeys.
Front-panel key access: CAL
NOTE In multiband sweeps, the frequency displayed corresponds to the
local-oscillator start frequency of the band that was being swept when
the key was pressed.
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