3 Short-Range Comms & IoT Mode
3.9 Occupied BW Measurement
3.9.6 Frequency
Opens the Frequency menu, which contains controls that allow you to control the
Frequency and Channel parameters of the instrument.
Some features in the Frequency menu are the same for all measurements in the
current Mode – they do not change as you change measurements. Settings like
these are called “Meas Global” and are unaffected by Meas Preset. For example, the
Center Freq setting is the same for all measurements - it does not change as you
change measurements.
3.9.6.1 Settings
Contains controls that pertain to the X-Axis parameters of the measurement. These
parameters control how data on the vertical (X) axis is displayed and control
instrument settings that affect the horizontal axis.
Center Frequency
Sets the frequency that corresponds to the horizontal center of the graticule (when
frequency Scale Type is set to linear). While adjusting Center Frequency, Span is
held constant, which means that both Start Freq and Stop Freq will change.
In measurements that also have Start Freq and Stop Freq controls, pressing Center
Frequency sets the frequency entry mode to Center/Span. In Center/Span mode,
the center frequency and span values are displayed below the graticule, and the
default active function in the Frequency menu is Center Frequency. In the
Start/Stop annotation mode, Start Freq and Stop Freq are displayed below the
graticule instead of Center Frequency and Span.
Pressing Center Frequency also sets the frequency entry mode to Center/Span. In
Center/Span mode, the center frequency and span values are displayed below the
graticule, and the default active function in the Frequency menu is Center
Frequency.
When Display Scale Type is set to LOG, pressing Center Frequency sets the
frequency that corresponds to the arithmetic mean of the start frequency and stop
frequency, which is not at the horizontal center of the graticule.
The center frequency setting is the same for all measurements within a Mode, that
is, it is Meas Global. Some Modes are also able to share a Mode Global center
frequency value. If this is the case, the Mode has a Global tab in its Meas Setup
menu.
Center Frequency sets (and queries) the center frequency for the currently selected
input. If your instrument has multiple inputs, and you select another input, Center
1278 Short Range Comms & IoT Mode User's &Programmer's Reference
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