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
e ect.
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
o set
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