Agilent Technologies 4395A - Page 401

Impedance
Measurement
Scheme
Impedance Measurement
Scheme
Measurement
Block
Diagram
With
the
43961A connected,
the measurement
circuit is
as shown
in Figure
A-15
.
Figure
A
-15.
Impedance
T
est
Kit
Block
Diagram
The
source
signal
is
output
from
RF
OUT
port.
V
V
voltmeter
is
R
port
receiver
that
measures
a
voltage
.
V
I
voltmeter
is
A
port
receiver
that
measures
a
voltage
of
R
0
to
obtain
a
current.
T
est
Signal
Level
at
DUT
The
test
signal
level
actually
applied
to
the DUT
depends on
the test
signal level
from
the
4395A
,
the
output
impedance
,
the
insertion
loss
of the
Impedance T
est Kit,
and
the
impedance
of
the
DUT
.
Figure
A
-16
shows
the
simplied
equivalent
circuit
of
the 4395A
and 43961A.
Figure A-16. Test Signal Level
Basic Measurement Theory A-25