3 VMA Mode
3.5 Channel Power Measurement
On instruments with the NF2 license installed, the calibrated Noise Floor used by
Noise Floor Extensions should be refreshed periodically. Keysight recommends that
the Characterize Noise Floor operation be performed after the first 500hours of
operation, and once every calendar year. The control to perform this is located in the
System, Alignments, Advanced menu. If you have not done this yourself at the
recommended interval, then when you turn on Noise Floor Extensions, the
instrument will prompt you to do so with a dialog that says:
“This action will take several minutes to perform. Please disconnect all cables from
the RF input and press Enter to proceed. Press ESC to cancel, or Postpone to
postpone for a week”
If you Cancel, you will be prompted again the next time you turn NFE ON. If you
Postpone, you will be prompted again after a week passes and you then turn NFE
ON.
3.5.8.5 Global
The controls in this menu apply to all Modes in the instrument.
Some controls (for example, "Global Center Freq" on page 1828) allow you to switch
certain Meas Global parameters to a Mode Global state. These switches apply to all
Modes that support global settings. For example, no matter what Mode you are in
when you set Global Center Freq to ON, it applies to all Modes that support Global
settings.
Other controls (for example, Extend Low Band) are actually set in this menu, but
apply to all Modes.
Global Center Freq
The software maintains a Mode Global value called Global Center Freq.
When Global Center Freq is switched ON, the current Mode’s center frequency is
copied into the Global Center Frequency, and from then on all Modes that support
global settings use the Global Center Frequency, so you can switch between any of
these Modes and the Center Frequency remains unchanged.
Adjusting the Center Frequency of any Mode that supports Global Settings, while
Global Center Freq is ON, modifies the Global Center Freq.
When Global Center Freq is switched OFF, the Center Frequency of the current
Mode is unchanged, but now the Center Frequency of each Mode is once again
independent.
When Mode Preset is pressed while Global Center Freq is ON, the Global Center Freq
is preset to the preset Center Frequency of the current Mode.
897 Vector Modulation Analyzer Mode User's &Programmer's Reference
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