Press the wave shap key of the selected carrier wave to display the
waveform and parameters of the carrier wave. You can change the
parameters of the carrier wave. Press Mode to return to the modulation
mode interface.
(4) Select modulating wave source:
Press the Source softkey to select the modulating wave source.
If you select External, use the Sync/Ext Mod/Trig/FSK connector at the
rear panel to input the external modulating signal, the AM setting is
completed.
If you select Internal, continue with the following steps.
(5) Select modulating wave shape:
Press the Shape softkey, then press the Sine, Square, Ramp or Noise
softkey to select the modulating wave.
(6) Set modulating wave frequency:
Press the Frequency softkey to set the modulating wave frequency. The
range is 2 mHz – 1 MHz (for internal source only).
(7) Set modulation depth:
Press the Depth softkey to set the modulation depth. The range is 0% -
120%.
AM frequency
The frequency of the modulating waveform.
Modulation Depth
The amplitude range of modulating waveform. In 0% modulation, the output
amplitude is half of the specified value. In 100% modulation, the output
amplitude is equal to the specified value. For an external source, the depth of
AM is controlled by the voltage level of the signal connected to the Sync/Ext
Mod/Trig/FSK connector at the rear panel. +1 V corresponds to the currently
set depth 100%.
DSB-AM (Double-Sideband AM)
The generator supports two kinds of amplitude modulation: normal AM and
Double Sideband AM. In normal AM, the modulated waveform contains carrier
components. As the carrier components do not carry information, the
modulation efficiency is low. To improve the modulation efficiency, you can
suppress the carrier components on the basis of the normal AM. At this point,
all the modulated waveform components carry information. This mode is
called DSB-AM (Double Sideband suppressed carrier modulation). The
DSB-AM user interface is shown below.
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