Chapter 2 187
Front-Panel Key Reference
SPAN X Scale
There are separate annotations for frequency,
bandwidth, sweep time, reference level, amplitude scale
and scale/div for each window. The values for these
parameters can be changed for each window
independently.
To activate the top window, press the
Next Window key
located below the display. The active window is
distinguished by a green border. Only the active
window will have a sweep taken and updated to the
display. When the active window is toggled, the state
for the active window is saved, and the last state of the
inactive window is recalled. When the window becomes
inactive, its data invalid indicator will appear on the
display. The data invalid indicator will remain until the
window becomes the active window and a complete
sweep has been executed. Pressing
Zoom will change to
a one-window display showing only the active window.
Pressing Zoom again will return you to the two-window
display. Pressing Zone (Off) will return you to a
one-window display of the active window.
Key Access:
SPAN X Scale, Zone
NOTE Pressing Zoom will set Zone (On), if it is off.
Zone Center Allows you to change the frequency of the zone markers
without changing the zone span. The zone markers are
vertical lines marking the zone in the upper window.
They determine the frequency range displayed in the
lower window. As the zone markers in the upper
window are moved, the center frequency of the lower
window is changed but the lower window will not be
updated to reflect the change unless it is selected as the
active window. (See
Zone On Off.)
The center frequency for the lower window is not
limited by the selected start and stop frequencies in the
upper window. However, if the frequency span of the
lower window is outside of the span for the upper
window, the vertical span markers will be displayed at
the edge of the graticule. When the lower window is
active, the
FREQUENCY Channel key will allow you to
change
Zone Center. Any change to the lower window
while it is active will change the center frequency.
Key Access:
SPAN X Scale, Zone
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