Chapter 2 193
Front-Panel Key Reference
Sweep
Level Gate
High Low
Sets up level polarity that will open the gate. Requires
Option 1D6.
Level Gate (High) Selects a high TTL level to open the
gate.
Level Gate (Low) selects a low TTL level to open
the gate.
Key Access:
Sweep, Gate
Points
Allows you to set the number of points per sweep, from 101 to 8192 in
non-zero span and 2 to 8192 in zero span (firmware revision A.05.00
and greater). Use the knob, step keys, or numeric keypad to set this
value. When the sweep time is limited by the Analog to Digital
Converter (ADC) sample rate, the sweep time changes with the number
of points selected. The greater the number of points, the longer the
sweep time becomes. If
Preset is pressed (and Preset Type is set to
Factory), or the analyzer power is cycled, the number of points per
sweep will default to 401. The current value of points is displayed next
to the sweep time.
When
FREQUENCY, Scale Type (Log) is selected, the desired number of
sweep points may not be possible. Refer to āScale Type Log Linā on
page 111 for more information.
Changing the number of points has several effects on the analyzer.
Since markers are read at the point location, the marker reading may
change. Press
Peak Search, again for greater accuracy in the marker
reading. All trace data for the current window is cleared. If in
continuous sweep mode, (
Sweep, Sweep (Cont)), a new sweep begins
immediately. If average is on (
BW/Avg, Average (On)), the averaging
starts over with a count of 0. With firmware revisions prior to A.08.00,
if Limit Lines are on (
Display, Limits, Modify, Limit 1 or 2 (On)), they are
turned off.
Key Access:
Sweep
NOTE By selecting a number of sweep points greater than 401, you are
optimizing frequency resolution and accuracy while accepting a reduced
measurement speed. In addition to sweep points, the span, resolution
bandwidth, video bandwidth, average detection and center frequency
will also affect measurement speed.
When zone span is on (
Span, Zone. Zone (On)), each window has its own
value for points.
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