Chapter 2 85
Front-Panel Key Reference
Det/Demod
FM Turning FM demodulation on turns off AM
demodulation (if it is on). For non-zero spans, a
100 kHz resolution bandwidth is used during the
demodulation, regardless of the screen annotation.
When the span is set to zero span, the displayed
bandwidth is used. For best results, move the signal to
be demodulated to within 3 graticules of the top of the
display.
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),
YAxis Units, Normalize, Display Line, Peak Excursion,
and Peak Threshold. In AM Demod, pressing
Demod View (On) has no effect. The Bluetooth™ FM
Demod (Option 106) has a fixed vertical scale of
approximately 40 kHz/Div.
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
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