HP 8753D - Page 403

Figure
6-77. Combined
Eects of
Amplitude
and
Phase
Modulation
Using
the
demodulation
capabilities
of
the
analyzer
,it
is
possible
to
view
the
amplitude
or
the
phase
component
of
the
modulation
separately
.
The
window
menu
includes
the
following
softkeys
to
control
the
demodulation
feature:
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
DEMOD:
OFF
is
the
normal
preset
state
,
in
which
both
the
amplitude and
phase components
of
any
test
device
modulation
appear
on
the
display
.
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
AMPLITUDE
displays
only
the
amplitude
modulation, as
illustrated in
Figure
6-78
a.
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
PHASE
displays
only
the
phase modulation,
as
shown
in
Figure
6-78
b
.
Figure 6-78.
Separating the Amplitude and Phase Components of T
est-Device-Induced
Modulation
Forward transform range. In the forward transform (from CW time to the frequency domain),
range is dened as the frequency span that can be displayed before aliasing occurs, and is
similar to range as dened for time domain measurements. In the range formula, substitute
time span for frequency span.
Example:
6-136 Application and Operation Concepts