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Sensitivity
The SA "Sensitivity: MIN/MAX" field shifts the
baseline reference of the display by 10 db. This is
valid only for 0 db input attenuation. Changing
the input attenuation or changing from ANT to
RF I/O port in the RF Control zone will change
the vertical scale of the Spectrum Analyzer
display. Calibration is maintained between the
display and the signal level present at the input
port so there is no need to compensate for added
attenuation.
Dispersion
Select the band width (20 kHz, 50 kHz, 100 kHz,
200 kHz, 500 kHz, 1 MHz, 2 MHz [optional], 5
MHz [optional], or 10 MHz [optional] per
division) by first moving the cursor to the
dispersion field, then pressing the desired soft-
key. When operating in the optional wider
dispersion settings, it is normal for the response
time of the analyzer to slow down somewhat.
Center frequency is entered from the RF Control
zone and may be conveniently varied with the
TUNING knob.
When operating in dispersions greater than
1 MHz/div, the normal monitor metering
functions including "see and hear" audio
monitoring are disabled.
Storage (if equipped)
Optional
Storage
HOLD, and PEAK HOLD) are selected by
moving the cursor to the "SA:" field, then
pressing the desired softkey.
NOTE
modes
(FREEZE,
Freeze -
Pressing this softkey provides immediate
storage of a spectrum display. This allows cap-
ture of intermittent transmissions etc. for more
detailed
normal "real time" analysis, simply press the
NORMAL softkey.
Max Hold -
This softkey provides a cumulative storage of
peak levels displayed over time. The time
duration is indefinite subject to reset by
pressing the NORMAL softkey.
The Max-Hold display can be frozen by
switching to the Freeze mode. To re-start the
max-hold operation, re-select the Max-Hold
mode. In any case, this causes the Max-Hold
feature to re-initialize and begin collecting input
samples.
Peak Hold -
This key provides a cumulative storage
capability similar to MAX HOLD. It differs in
that in addition to peak responses, the lower
portions of the display are also shown to permit
observation of "real time" activity.
Average Mode -
Operation in the Average mode continuously
averages the previous 100 spectrum analyzer
measurements and displays the averaged value.
After averaging has been selected, the number
of frames used in the averaging calculation will
MAX
be displayed in the "Cnt:" field.
Markers (if equipped)
Select marker operation by moving the cursor to
the "Mrk:" field, then pressing the desired
softkey (OFF, DELTA, or ABS). Selection of
DELTA () provides two markers on the SA
screen (refer to figure 7-19). These permit
relative measurement, between selected points on
the display, of both level and frequency. The
50
analysis.
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