5.Panel Operation
28
Figure 5-12: DSB-AM user interface
How to set the parameters of DSB-AM
(1)
Press the
Mod
function key, then press the
Type
softkey, turn the
knob
to select
DSBAM
, press the
OK
softkey.
(2)
Select carrier wave shape
:
The carrier wave can be
Sine
,
Square
, or
Ramp
. Press
,
, or
to
select a desired carrier wave shap.
(3)
Set carrier wave parameters
:
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
Mod
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
Mod/FSK/Trig
connector at the rear panel to
input the external modulating signal, the DSB-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
, or
Ramp
softkey to select
the modulating wave.
(6)
Set modulating wave frequency
:
Press the
AM 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% - 100%.
FM (Frequency Modulation)
The modulated waveform consists of the carrier wave and the modulating wave. For
FM, the frequency of the carrier wave varies with the instantaneous voltage of the
modulating wave. The FM user interface is shown below.