Instructions

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4.4 Sweep/BW
4.4.1 Sweep/BW > RBW
Enables the Resolution Bandwidth (RBW) for the sweep to be set:
Auto automatically selects an appropriate RBW for the current span. When selected,
the word Auto appears in front of the RBW value.
15kHz fixes the RBW at 15kHz providing the highest
resolution and lowest noise, but increasing sweep time for
wider spans. 280kHz fixes the RBW at 280kHz providing a
compromise between sweep speed and resolution. 1MHz fixes the RBW at 1MHz providing a
faster sweep for wide spans at the expense of resolution and noise.
4.4.2 Sweep/BW > Video Filter
Enables a filter to be added between the detector and the display. Video filtering
reduces noise within the sweep without significantly affecting peaks within the
measurement.
On turns the video filter on.
Off turns the video filter off.
The status of the video filter (On or Off) is shown within the top annotation area next to the
RBW value.
4.4.3 Sweep/BW > Sweep
Enables the sweep to be set to run continuously or in single sweep mode.
Repeat causes the sweep to run continuously unless it is stopped with
the Sweep Control key. Single causes single sweeps to be performed in
response to the Sweep Control key.
When option U01 is installed Sweep Triggering is available. The trigger event stops the sweep
when in Repeat mode, and starts the sweep when in Single mode.
Sweep Trigger creates a pop-up menu from which the trigger source can be
selected. Note that Limits triggering is only available in Repeat mode.
Single ReArm Only applies to Single sweep mode. When set to Auto, the trigger is
re-armed to accept new trigger events at the end of the sweep. When set to Manual,
the Sweep Control key must be pressed before another sweep can be triggered.
4.4.4 Sweep Control Key
This key is placed directly below the graticule on the right hand side of the screen.
Its action is duplicated by the hard key marked ‘Run/Stop’.
The function of the key is to start and stop the sweep when in Repeat mode, and to
initiate the sweep when in Single mode. The colour and marking of the key changes to show
the current status of the sweep.
4.4.5 Sweep Progress Bar
When the sweep time is greater than about 1 second, the sweep is drawn progressively across
the screen. In this mode a yellow sweep progress line is shown at the bottom of the graticule.
RBW
Auto
15kHz
280kHz
1MHz
Video
Filter
On
Off
Sweep
Repeat
Single
Sweep
Trigger
Single
ReArm
Running
(Stop)