Agilent Technologies 4395A - Page 402

Impedance
Measurement
Scheme
The
output signal
is divided
by
the
input
impedance
(R
0
)
and the
impedance of
the
DUT
.
Y
ou
can
use the
following
equation
to
determine
the
signal
level
actually
applied
to
the
DUT:
V
D
U
T
=
V
S
E
T
2
Z
DU
T
(
Z
D
UT
+
R
0
)
[
V
]
Where
,
V
DUT
V
oltage level
that is
actually applied
to
the
DUT
.
V
SET
V
oltage level
that
is
set.
See
below
.
Z
DUT
Impedance
of the
DUT
.
R
0
Input
impedance,
50
.
The
4395A denes
the
output
level
as
the
level
when
the
RF
OUT
port
is
50

terminated.
Therefore
,
you
can
calculate
the
voltage
from
dBm,
V
S
E
T
=
q
10
P
S
E
T
10
2
0
:
001
2
R
0
Where
,
P
SET
Output
power
setting
level.
[dBm]
A-26 Basic Measurement Theory