3 VMA Mode
3.4 IQ Waveform Measurement
3.4.6 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.
3.4.6.1 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 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 Freq function sets (and queries) the Center Frequency for the currently
selected input. If your instrument has multiple inputs, and you select another input,
the Center Freq changes to the value for that input. SCPI commands are available to
directly set the Center Freq for a specific input.
Center Freq is remembered as you go from input to input. Thus, you can set a
Center Freq of 10 GHz with the RF Input selected, change to BBIQ, and set a Center
Freq of 20 MHz, then switch to External Mixing and set a Center Freq of 60 GHz, and
when you go back to the RF Input the Center Freq will go back to 10 GHz; back to
BBIQ and it is 20 MHz; back to External Mixing and it is 60 GHz.
For more details, see the following:
–
"RF Center Freq (Remote Command Only)" on page 742
–
"Ext Mix Center Freq (Remote Command Only)" on page 742
–
"I/Q Center Freq (Remote Command Only)" on page 743
Vector Modulation Analyzer Mode User's &Programmer's Reference 738
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