Agilent Technologies 4395A - Page 294

Gain
Compression
Measurement
(NA)
Figure
10-15.
Gain
Compression
Absolute
Output
Level
Measurement
The analyzer
can show
the characteristics
input
level
versus
output
level
by
using
the
absolute
measurement capability
in the
network
analyzer
mode
.
1.
Press
4
Ma
rk
er
5
N
N
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NN
NN
N
N
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N
N
MKR
[UNCOUPLE]
to
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
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N
N
N
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N
N
N
N
N
N
N
N
NN
N
MKR
[COUPLE]
to
couple
the
marker
between both
channels
.
2.
Press
4
Chan
2
5
4
Meas
5
N
N
N
NN
N
N
N
N
N
N
N
N
N
MORE
N
N
N
NN
B
to
select
the
absolute
measurement
at
the
B
input.
3.
Press
4
Displa
y
5
N
N
N
N
N
N
N
N
N
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N
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N
NN
N
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NN
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N
DATA
MATH
[DATA]
N
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NN
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N
N
OFFSET
.
Then
input
the
value
of
the
attenuator
that
is
connected between
the
DUT
and
the
B
input.
In
this
example
measurement,
a
30
dB
attenuator
is used.
Therefore,
enter
30
4
2
1
5
.
4.
The 4395A
displays the
input
versus
output
power
levels
.
The
marker
shows
the
input
and
output
power levels
at the
0 1
dB
gain
compression
point.
5.
Press
4
Displa
y
5
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
N
N
DUAL
CHAN on
OFF to
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
ON
off to
display both
channel
(see
Figure
10-16
).
Note that
you must
subtract
6
dB
from
the
input
value
readout.
This
is
necessary
because
the
input
signal
is
attenuated
by
the
power
splitter
that
is
between
the
RF
OUT
and the
DUT
.
10-16 Examples of Applications