Agilent Technologies 4395A - Page 239

Measuring
the
Carrier
to Noise
Ratio
Measuring
the
Carrier
to
Noise
Ratio
1.
Set up
the frequency
range within
which to
measure a
carrier signal.
2.
Press 4
Ma
rk
er
5
to place
the marker
on the
trace.
3.
Press
4
Scale
Ref
5
and choose
N
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
PEAK
! REFERENCE
to set
the reference
level to
the
carrier
signal
level.
4.
A
djust
the
scale/div
to
display
the carrier
and noise
oor.
Use 4
Scale
Ref
5
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
SCALE/DIV
.
5.
Press
4
Ma
rk
er
5
and choose
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
1MODE
MENU
N
NN
NN
NN
NN
N
N
N
N
N
1MKR
to place
the reference
marker on
the
carrier
signal.
6.
Press
4
Bw/Avg
5
.
Then
choose
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
VIDEO
BW
.
7.
Enter
an appropriate
video bandwidth
to reduce
the
variation.
8.
Press
4
Ma
rk
er
5
.
Then do
either of
the following:
Enter
the
oset
frequency
using the
numeric keys
.
Move
the
marker
into
the
noise
level of
the
trace
using
the
rotary
knob
.
9.
If
you
want
to
normalize
the
marker
readout
with
the
RBW
lter
,
press 4
Utilit
y
5
and
toggle
N
N
N
N
N
N
NN
NN
NN
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
N
N
N
N
N
N
N
N
N
N
NOISE
FORM
on OFF
to
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
ON
off
.
10.
Read
the
dierence
from
the
reference
marker
.
Figure 8-20. C/N Measurement
Analyzing the Measurement Results 8-37