5.Panel Operation
33
Figure 5-16: ASK user interface
How to set the parameters of ASK
(1)
Press the
Mod
function key, then press the
Type
softkey, turn the
knob
to select
ASK
, press the
OK
softkey.
(2)
Select carrier wave shape
:
The carrier wave can be
Sine
,
Square
,
Ramp
, or
Arbitrary
wave (except DC).
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
Internal
or
External
as the modulating wave
source.
(5)
If you select
Internal
, the modulating wave is set as a Square with 50% duty
cycle.
Press
the
ASK Rate
softkey to set the ASK rate. The rate at which the
output amplitude shifts between the carrier amplitude and the modulating
amplitude is determined by ASK rate (for internal source only). The range is 2
mHz – 1 MHz.
If you select
External
, use the
Mod/FSK/Trig
connector at the rear panel to
input the external modulating signal. Press the
Slope
softkey to switch between
Positive
and
Negative
polarity of the modulating wave to control the output
amplitude. Set the slope to
Positive
, the generator would output the greater of
the carrier amplitude and modulating amplitude when the external input signal
is logic high level, and output the lower when the external input signal is logic
