High
P
o
w
er
Measurements
Use
Figure
3-24
to
examine
the
maximum
p o
w
er
ratings
and
normal
signal
lev
els
presen
t
in
the
test
set.
The
signal
lev
els
are
appro
ximate,
with
signal
path
loss
increasing
with
frequency
.
Note
the
follo wing
c
haracteristics:
a.
T
ypically
,
the
RF
input
is
ab out
9
dBm
and
the
loss
to
the
selected
test
p ort
is
ab out
9
dB.
b.
With
the
step
attenuators
set
to
zero
dB,
the
loss
from
the
RF
input
to
the
a1
or
the
a2
mixer,
and
the
loss
from
P
ort
1
or
P
ort
2
to
the
b1
or
the
b2
mixer,
are
appro
ximately
equal
at
ab out
26
dB.
c.
Since
eac
h
mixer
includes
a
20
MHz
preamplier
to
oset
its
con
v
ersion
loss,
measuremen
t
of
the
User
P
arameters
will
sho
w
the
IF
lev
el
to
b e
ab out
22
dB
less
than
the
RF
input
or
the
signal
lev
el
at
the
test
p ort.
d.
F
or
sp ecied
p erformance,
the
maximum
IF
signal
lev
el
as
measured
b
y
the
user
parameters
is
010
dBm.
Higher
signal
lev
els
cause
errors
due
to
compression,
and
low
er
signal
lev
els
pro duce
greater
uncertain
t
y
due
to
noise.
Caution
Comp
onen
ts
in
the
test
set
will
b e
b e
damaged
at
certain
signal
lev
els.
T
o
a
v
oid
damage,
observ
e
the
follo
wing
op erating
precautions:
Use
the
POR
T
1
and
POR
T
2
attenuators
(Stimulus
P
o
w
er
men
u)
to
protect
the
mixer
input
0
the
mixer
damage
lev
el
is
+20
dBm
(1
w
att,
CW).
Install
appropriate
comp onen
ts
in
the
rear
panel
extension
links
to
protect
the
test
set
F
orward/Rev
erse
switch
0
the
damage
lev
el
is
+20
dBm
applied
at
an
y
input
or
output.
This
means
that
if
the
device
output
is
greater
than
+20
dB,
the
switch
can
b e
damaged
b
y
+20
dBm
presen
t
at
either
LO
W
PO
WER
OUT
connector.
If
the
device
output
is
greater
than
+43
dBm,
use
appropriate
comp onen
ts
to
protect
the
test
set
p orts
(and
the
F
orward/Rev
erse
switch)
0
the
damage
lev
el
is
+43
dBm
(20
w
atts)
applied
at
POR
T
1
or
POR
T
2.
Operation
3-29
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