6-76 Chapter6
Front-Panel Key Reference
Source
Source
Accesses the tracking generator key functions (Options 1DN or 1DQ
only). Without Option 1DN or 1DQ, pressing
Source will cause the error
message “Option not installed” to appear on the analyzer display.
CAUTION If Auto Align is on, the 3 GHz tracking generator will be momentarily
retuned to approximately 1.557 GHz between most sweeps. Some
devices under test (for example, amplifiers with AGC) may be
susceptible to damage due to this momentary retuning. To avoid this
momentary retuning, turn the auto align off. (Press
System, Alignments,
Auto Align, Off.) Refer to the appropriate “Specifications and
Characteristics” chapter in the Agilent ESA Spectrum Analyzers
Specifications Guide for information on using the analyzer with Auto
Align Off.
Amplitude On Off Activates (On) or deactivates (Off) the output power of the tracking
generator. The power level can then be adjusted using the numeric
keypad, step keys, or knob. Pressing any digit, 0 through 9, on the
numeric keypad brings up the selected terminator menu. See the
specifications chapter in the calibration guide for the available output
power for your tracking generator.
NOTE For spectrum analyzers with Option 1DN or Option 1DQ, the tracking
generator must be turned on (
Source, Amplitude (On)) before you set up
the segmented sweep table.
NOTE When Amplitude (Off) is selected, the output attenuation on the Agilent
E4402B, E4403B, E4404B, E4405B, E4407B and E4408B is set to the
maximum attenuation.
Power Sweep
On Off
Activates (On) or deactivates (Off) the power-sweep function. The value
of the power-sweep range is displayed in the active-function block when
you press
Power Sweep (On). The analyzer continues to sweep the
specified frequency range when power sweep is on. (To do a power
sweep at a fixed frequency, set the analyzer to zero span at the desired
frequency.) The available power-sweep range is a function of the source
attenuator setting. See the specifications chapter in the calibration
guide for the available power sweep range.
The output power of the tracking generator is swept according to the
sweep rate of the analyzer. The output power is always swept from the
source power setting to a higher power setting (negative source power
sweep values are not allowed).
Power-sweep measurements are particularly useful in making gain
compression measurements or output power versus frequency
measurements.
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