6-18 Chapter6
Front-Panel Key Reference
Det/Demod
Demod View
On Off When Demod View (On) is pressed, the vertical scaling of
the display is in frequency, and marker will read out
the FM deviation in kHz when. When Demod View is
On, the following functions are not available: Log/Lin
(the display is calibrated in Hz), Y Axis Units, Marker
Search functions, Normalize, Display Line, Peak
Excursion, and Peak Threshold. In AM Demod,
pressing
Demod View (On) has no effect.
Speaker On Off Turns the internal speaker on and off. The volume from
the speaker is controlled by the front-panel volume
control knob. Pressing
Preset sets the speaker function
to
Speaker (Off).
Demod Time Allows you to set the time, in non-zero spans, to pause
and demodulate the signal after each sweep. The
demodulated signal can be heard during demodulation
when in
Speaker (On) mode. In AM, the Video BW is set
to 3 kHz and the Resolution BW is set to 10 kHz. In
FM, the Video BW is set to 30 kHz and the Resolution
BW is set to 100 kHz.
In zero span, demodulation is performed (and can be
heard) throughout the sweep. When AM or FM Demod
is enabled, the instrument will tune to the marker
frequency and wait for the Demod to take place. For
long Demod times, pressing
Preset will abort the Demod
function. The default value is 500 ms. Key Access:
Det/Demod, Demod
NOTE It is normal to hear clicking sounds when the Auto Alignment function
is On. During retrace, a small portion of the analyzer circuitry is
realigned. Some of the switching of the analyzer circuitry is done using
relays. It is the rapid switching of these relays during retrace that
causes the clicking sounds. To eliminate the clicking sounds, turn the
auto alignment off by pressing
System, Alignments, Auto Align, Off.
When this is done, the
Align Now, All function should be performed
periodically. Refer to the appropriate “Specifications and
Characteristics” chapter in the Agilent ESA Spectrum Analyzers
Specifications Guide for more information on how often to perform
Align
Now, All when the auto alignment is off
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