Agilent Technologies 4395A - Page 400

I-V
Measurement
Method
However
, with
the I-V
method,
the
measurement
error
does
not
depend
on
the
impedance
of
the
DUT because
the
I-V
method
measures
the
impedance
directly
from
the
ratio
of
the voltage
and
current. Using
the
I-V
method,
you
can
measure
a
wide
range
impedance
with
constant
accuracy
.This
is
the
major
advantage
of
the
I-V
method.
The
4395A,
when
combined
with
the
43961A,
uses
a
RF
I-V
measurement
method
to measure
the
impedance of
a
DUT
at
higher
frequencies
.
While
the
RF
I-V
measurement
method is
based
on
the
same
principal
as
the
I-V
measurement
method,
it
is
possible
to
operate at
higher
frequencies
by
using
an
impedance
matched
measurement
circuit
(50
)
and
a
precision
coaxial
test
port.
A-24 Basic Measurement Theory