Measure
a
30
dB
Amplifier.
Figure
3-25
sho
ws
the
setup
for
measuremen
t
of
an
amplier
ha
ving
ab out
30
dB
of
gain.
Using
the
standard
RF
source
p o
w
er
setting
of
+9
dBm,
the
signal
lev
el
at
P
ort
1
is
ab out
+0
dBm,
the
lev
el
at
the
b2
mixer
is
ab out
+5
dBm,
and
the
signal
lev
el
at
the
rev
erse
p ole
of
the
forward/rev
erse
switch
is
ab out
+30
dBm.
In
order
to
a
v
oid
damage:
The
A
TTENUA
TOR
POR
T:
2
step
attenuator
m
ust
b e
set
to
at
least
20
dB
to
protect
the
b2
mixer;
and,
An
attenuator
or
isolator
m
ust
b e
added
in
the
rear
panel
POR
T
2
links
to
reduce
the
signal
lev
el
at
the
rev
erse
p ole
of
the
switch
to
b elow
+20
dBm.
If
an
y
IF
O
VERLO
AD
message
or
O
annotation
is
display
ed
on
the
net
w
ork
analyzer
when
y
ou
are
op erating
in
the
normal
BW,
non
pulsed-RF
mo
de,
the
RF
p o
w
er
lev
el
m
ust
b e
low
ered
un
til
the
message
no
longer
app ears.
An
isolator,
pro
viding
ab out
30
dB
of
isolation
b et
w
een
P
ort
2
and
the
switch,
is
the
b est
c
hoice
b ecause
it
can
preserv
e
the
dynamic
range
for
rev
erse
measuremen
ts.
Better
p erformance
for
the
rev
erse
measuremen
ts
will
b e
obtained
b ecause
the
isolator
will
minimize
the
insertion
loss
from
the
rev
erse
p ole
of
the
switch
to
P
ort
2,
and
to
a2.
Note
The
net
w
ork
analyzer
can
not
sense
IF
Ov
erload
conditions
in
the
pulsed-RF,
wide
BW
mo
de
of
op eration.
Alwa
ys
c
hec
k
the
user
1
through
user
4
lev
els
to
b e
sure
they
are
b elow
010
dB
indicated
on
the
display
.
Figure
3-25.
Measuring
a
30
dB
gain
Amplifier
Measure
an
Amplifier
with
High
Input
Lev
els.
Figure
3-26
sho
ws
the
setup
for
measuremen
t
of
an
amplier
with
ab out
20
dB
of
gain
that
needs
an
input
lev
el
of
ab out
40
dBm.
A
40
dB
gain
amplier
is
installed
in
the
rear
panel
POR
T
1
links
to
b o ost
the
signal
lev
el
to
the
desired
v
alue
without
exceeding
+43
dBm
(20
w
atts).
The
signal
lev
el
at
the
test
p ort
is
Operation
3-31
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