25
PM
(Phase
Modulation)
The
modulated
waveform
consists
of
two
parts:
the
Carrier
Waveform
and
the
Modulating
Waveform.
The
Carrier
Waveform
can
only
be
Sine.
In
PM,
the
phase
of
the
Carrier
Waveform
varies
with
the
instantaneous
voltage
level
of
the
modulating
waveform.
The
user
interface
of
the
PM
is
shown
as
below.
Figure 5-14: The User Interface of PM
How
to
set
the
parameters
of
PM
(1)
Press
Mod
function
button.
(2)
Press
F1
to
switch
Mod
Type
to
PM.
If
the
Carrier
Waveform
is
not
Sine,
the
system
will
switch
it
to
Sine
automatically.
(3)
Press
button
to
display
the
waveform
and
parameters
of
the
Carrier
Waveform.
You
can
change
the
parameters,
please
refer
to
To
Output
Sine
Signals
on
page
11.
Press
button
again
to
return
to
the
Modulation
mode
interface.
(4)
Press
F5
to
select
the
source.
If
the
source
is
External,
use
the
Ext
Mod
In
connector
in
the
rear
panel
to
input
the
external
signal,
then
skip
ahead
to
step
(6).
If
you
choose
Internal,
continue
to
the
steps
below.
(5)
Press
F2
to
choose
Mod
Shape,
you
can
choose
Sine,
Square
or
Ramp.
(6)
Press
F3
to
set
PM
Frequency.
The
range
is
2
mHz
‐
20
kHz
(Internal
source
only).
(7)
Press
F4
to
set
Phase
Deviation.
The
Phase
Deviation
between
the
Modulating
Waveform
and
the
Carrier
Waveform
ranging
from
0°
to
180°.
FSK
(Frequency
Shift
Keying)
The
FSK
Modulation
is
a
modulation
method,
the
output
frequency
of
which
switches
between
two
the
pre
‐
set
frequencies
(Carrier
Waveform
Frequency
and
the
Hop
Содержание GV-2005
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