Chapter 2 187
Front-Panel Key Reference
SPAN X Scale
Zone
On Off
Zone (On) allows you to change from a one-window to a
two-window display. The top window will display the
trace with two vertical lines (Zone Markers) displayed
at center frequency plus and minus 5% of the current
span. (You can change the default zone frequency and
zone span values using the
Zone Center and Zone Span
keys.) The top window will be inactive.
The bottom window will display the section of the trace
in the top window that is between the Zone Markers.
The span of the bottom window is 10% of the span of
the top window. (You can change the default zone
frequency and zone span values using the
Zone Center
and
Zone Span keys.) When first activated, both
windows have the same center frequency. The bottom
window is active and the sweep time, resolution
bandwidth, and video bandwidth have been coupled to
the bottom window span.
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.
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