Agilent Technologies Agilent 4396B User Manual
Page 72
C/N
Measurement
C/N
is
the
ratio
of
the
carrier
to
the
noise
.
The
analyzer
can
measure
noise
level
directly
and
read
out
the
C/N
using
the
marker
functions
.
Do
the
\Harmonic
Distortion
Measurement"
before
doing
this
measurement.
T
est
Signal
This
example
uses
the
same
test
signal
used
in
the
\Harmonic
Distortion
Measurement"
example
.
Measurement
Setup
Connection
This
example
assumes
that
the
connections
and
instrument
settings
made
in
the
\Harmonic
Distortion
Measurement"
example
are
still
in
eect.
Analyzer
Settings
Change
the
following
settings
for
this
measurement:
Press
4
Center
5
100
4
M/
5
and
4
Span
5
100
4
k/m
5
to
zoom
to
the
fundamental
on
the
display
.
Fixed
1Marker
and
Noise
F
ormat
for
C/N
Measurement
1.
Press
4
Search
5
NNNNNNNNNNN
MAX
to
search
for
the
carrier
.
2.
Press
4
Scale
Ref
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MKR ! REFERENCE
.
3.
Press
4
Ma
rk
er
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
1MODE
MENU
NNNNNNNNNNNNNN
1MKR
10
4
k/m
5
to
put
1marker
on
the
carrier
and
to
move
the
marker
to
the
10
kHz
oset
point.
4.
Press
4
Bw/Avg
5
NNNNNNNNNNNNNNNNNNNNNNNNNN
VIDEO
BW
10
4
21
5 .
5.
Press
4
Utilit
y
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NOISE
FORM
on
OFF
to
NNNNNNNNNNNNNNNNNNNN
ON
off
.
The
analyzer
displays
the
C/N
ratio
with
the
unit
of
\dB/Hz"
at
the
upper
right
of
the
display
as
shown
in
Figure
4-4.
Figure
4-4.
Using
Markers
and
Noise
F
ormat
to
Measure
C/N
Ratio
4-4
Spectrum
Measurement
Examples