3 Spectrum Analyzer Mode
3.6 Power Stat CCDF Measurement
Attenuator Configurations and Auto/Man
As described under "Attenuation" on page 1954, there are two distinct attenuator
configurations available in the X-Series, the Single Attenuator and Dual-Attenuator
configurations.
In Dual-Attenuator configurations, we have mechanical attenuation and electronic
attenuation, and current total attenuation is the sum of electronic + mechanical
attenuation.
In Single-Attenuator configurations, we refer to the attenuation set using "Mech
Atten" on page 1142 (or :POW:ATT) as the “main” attenuation; and the attenuation
that is set by :POW:EATT as the “soft” attenuation (:POW:EATT is honored even in
the Single-Attenuator configuration, for compatibility purposes). Then current total
attenuation is the sum of main + soft attenuation.
See "Elec Atten" on page 1960 for more about “soft” attenuation.
NOTE
In some measurements, the Mech Atten control has an Auto/Man function. In
these measurements, an Auto/Man switch is shown on the Mech Atten control:
Note that in configurations that include an Electronic Attenuator, this switch is
only shown when the Electronic Attenuator is disabled.
In other measurements, Mech Atten has no Auto/Man function. In these
measurements, no switch is shown on the Mech Atten control:
Mech Atten also appears with no switch, as above, in configurations that include
an Electronic Attenuator but when the Electronic Attenuator is enabled.
Elec Atten
Controls the Electronic Attenuator in Dual-Attenuator configurations. Does not
appear in Single-Attenuator configurations, because the control of both the
mechanical and electronic stages of the Single-Attenuator is integrated into the
single Atten control.
1144 Spectrum Analyzer Mode User's &Programmer's Reference
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