5.Panel Operation
32
PWM can only be used to modulate pulse, so the carrier wave must be
Pulse
.
Press
to set the carrier wave shap.
(2)
Press the
Mod
function key, then press the
Type
softkey, turn the
knob
to select
PWM
, press the
OK
softkey.
Note: If
Pulse
wave has not been selected,
PWM
in the menu is unavailable.
(3)
Set carrier wave parameters
:
Press
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, then skip ahead to
step (7)
.
If you select
Internal
, continue with the following steps.
(5)
Select modulating wave shape
:
Press the
Shape
softkey, then press the
Sine
,
Square
,
Ramp
,
Noise
, or
Arb
softkey to select the modulating wave.
(6)
Set modulating wave frequency
:
Press the
PWM Frequency
softkey to set the modulating wave frequency. The
range is 2 mHz – 1 MHz (for internal source only).
(7)
Set duty cycle deviation
:
Duty cycle deviation is the deviation (in %) of the modulating wave duty cycle
relative to the original pulse duty cycle. Press the
Deviation
softkey to set the
PWM duty cycle deviation.
Duty cycle deviation range: 0% ≤ deviation ≤ upper limit (upper limit is
carrier
duty cycle
or
100% minus carrier duty cycle
, the smaller of the two).
ASK (Amplitude Shift Keying)
Amplitude Shift Keying modulation is a modulation technique that shifts the output
signal amplitude between two amplitudes: the carrier amplitude and modulating
amplitude. Carrier wave amplitude shifts to the modulating amplitude with the
specified ASK rate, and then returns to the original amplitude. The ASK user
interface is shown below.
