Agilent Technologies 54503A User's Guide Page 244

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244 Chapter4
Key Function Descriptions
Key Descriptions
LAST SPAN Sets the spectrum analyzer to the previously selected
span, allowing you to toggle between two settings. For
example, you can toggle between zero span and a larger
span to view modulation in both the frequency and time
domains.
Front-panel key access:
SPAN
LAST STATE Recalls the instrument state thatexisted before the last
time that
PRESET was pressed.If the spectrum analyzer
has just been turned on, the recalled state will be the
state that the instrument was in when power was
turned off.
Front-panel key access:
PRESET or RECALL
LINE Sets the trigger to line mode. Sweep triggers occur at
intervals synchronized to the line frequency.
Front-panel key access: TRIG
LINEAR Selects a linear amplitude scale. Measurements using a
linear scale are normally read in millivolts, but other
units can be selected. See the UNITS softkey
description.
Front-panel key access:
AMPLITUDE
LOCK HARMONIC Displays and locks to the current harmonic number.
A harmonic number refers to the local-oscillator
harmonic that is used to sweep a specific external
mixing frequency band. These numbers are shown in
Table on page 244. When locked, only center
frequencies and spans that fall within the frequency
band of the current harmonic may be entered. When
FULL SPAN under SPAN is activated, the span is limited
to the frequency band of the selected harmonic.
Front-panel key access: AUX CTRL
Table 4-6 Mixing Harmonics for Unpreselected External Mixing
Frequency
Band
Frequency
Range
(GHz)
Mixing
Harmonic
Conversion
Loss
(Default)
K 18.0 to 26.5 6 30 dB
A 26.5 to 40.0 8 30 dB
Q 33.0 to 50.0 10 30 dB
U 40.0 to 60.0 10 30 dB
V 50.0 to 75.0 14 30 dB
E 60.0 to 90.0 16 30 dB
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