3 Short-Range Comms & IoT Mode
3.7 ACP Measurement
3.7.11 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. For example, the
Center Frequency setting is the same for all measurements - it does not change as
you change measurements.
3.7.11.1 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 the Center Frequency the Span 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 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
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. When you go back to the RF Input, Center Frequency returns
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 847
–
"Ext Mix Center Freq" on page 848
–
"I/Q Center Freq" on page 849
844 Short Range Comms & IoT Mode User's &Programmer's Reference
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