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Note
Making a Measurement Using Average Detection
6-4 Making Measurements
If the signal of interest is greater than 2.9 GHz, perform a preselector
AMPLITUDE
peak by pressing,
4
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
b. Press
place the marker on the emission.
Notice that the amplitude of the marker is displayed in the
upper left-hand corner of the screen.
c. Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
marker list.
To view the signals in the marker list, press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
.
FREQUENCY
d. Press
4
frequency to the next harmonic frequency.
e. Repeat the above procedure for each harmonic frequency.
For your convenience, we have provided a maximum hold feature
that may be useful when the signal appears to be unstable or when
printing out a copy of the graphics for a report. To access this
MODULE
functionality, press
4
If a copy of the display is required, press
softkeys to produce your output. Ensure that the appropriate printer
or plotter is connected and con gured. For more information, refer to
HP 8560 E-Series Spectrum Analyzer User's Guide
the
When the spectrum analyzer is used in linear mode, video ltering
provides the average value of a signal. After the signal has been
maximized and the peak value has been measured, an average
measurement may be made.
Video (post-detection) ltering provides averaging of higher frequency
components (such as noise) at the output of the envelope detector.
When the video lter bandwidth is narrower than the resolution
bandwidth lter, averaging occurs. Narrowband (for example,
continuous-wave) signal amplitudes are not a ected by video ltering.
For the true average, the video bandwidth must be less than the
lowest pulse repetition frequency, the sweep must be slow enough to
let the lters charge completely, and the spectrum analyzer must be in
the linear amplitude display mode.
To make an average measurement:
1. Press
PEAK SEARCH
4
center of the screen.
MKR
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
2. Press
,
4
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
5
(or any of the marker function keys) to
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
"
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
,
5
4
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
then
5
NNNNNNNNNNNNNN
!
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
to place the emission at the
5
with ON underlined.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
,
to add the signal to the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNN
,
,
to set the center
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
then
.
.
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