82 Chapter 2
Front-Panel Key Reference
Det/Demod
Key Access: Det/Demod, 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 Demod View is On, the
following functions are not available: Log/Lin (the
display is always linear and calibrated in Hz),
Y Axis Units, Normalize, Display Line, Peak Excursion,
and Peak Threshold. In AM Demod, pressing
Demod View (On) has no effect.
Key Access:
Det/Demod, Demod
Speaker
On Off
Turns the internal speaker on and off. The volume from
the speaker is controlled by the front-panel volume
control knob. Selecting AM or FM turns the speaker on.
Turning AM or FM off, pressing
Preset when Preset Type
is set to Factory, or cycling the power sets the speaker
function to off.
Key Access:
Det/Demod, Demod
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 zero span,
demodulation is performed (and can be heard)
throughout the sweep.) 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.
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 when
Preset Type is set to Factory 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 Specifications Guide for your instrument to
learn more information on how often to perform Align Now, All when the
auto alignment is off.
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