3 WLAN Mode
3.2 Channel Power Measurement
3.2.6 Frequency
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" on page 276.
For example, Center Frequency is the same for all measurements — it does not
change as you change measurements.
3.2.6.1 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. While
adjusting Center Frequency, "Span" on page 258 is held constant.
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 will have a Global tab in its Meas Setup
menu.
The Center Frequency function sets (and queries) the center frequency for the
currently selected input. If your instrument has multiple inputs, and you select
another input, Center Frequency changes to the value for that input. SCPI
commands are available to directly set Center Frequency for a specific input.
Center Frequency is remembered as you go from input to input. Thus, you can set a
Center Frequency of 10 GHz with the RF Input selected, change to BBIQ and set a
Center Frequency of 20 MHz, then switch to External Mixing and set a Center
Frequency of 60 GHz, and when you go back to the RF Input, Center Frequency will
go back to 10 GHz; back to BBIQ and it is 20 MHz; back to External Mixing and it is
60 GHz.
See:
–
"RF Center Freq" on page 256
–
"Ext Mix Center Freq" on page 257
253 WLAN Mode User's &Programmer's Reference
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