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Spectrum
Analyzer
Mode
Functions
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AI4
ON OFF
4
LOCK
ON OFF
+lOV REF
DETECTOR
-1OV
REF
DETECTOR
determines the percent of amplitude modulation of the
largest displayed signal and its two sidebands. The
sidebands are assumed to be entirely from amplitude
modulation. If there are differences in the sideband
amplitude, the larger value is used. The measurement runs
continuously, re-executing at the end of each sweep.
All three signals must be displayed. The frequency spacing
of the sideband signals must be the same within the span
accuracy of the measurement. All of the signals must be
greater than the PEAK EXCURSION above the THRESHOLD.
The amplitude scale may be either linear or logarithmic.
Front-Panel Key Access
(jj)
turns off the analyzer phase locking. The counter is turned
off so frequency correction is no longer done at the start
of each sweep. Turning the phase locking off increases
measurement speed, but it decreases frequency accuracy.
This is a service diagnostic function and is for service use.
Front-Panel Key Access
ICAL)
displays the output of the + 10 V reference from the
A7
Analog Interface assembly as a horizontal line at the top
graticule. This is a service diagnostic function and is for
service use only.
Front-Panel Key Access (CAL)
displays the output of the
-
10 V reference from the
A7
Analog Interface assembly as a horizontal line at the bottom
graticule. This is a service diagnostic function and is for
service use only.
Front-Panel Key Access (CAL]
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