4263B
F
our-T
erminal
P
air
Conguration
The
4263B
uses
the
four-terminal
pair
measurement
conguration
which
permits
easy
,
stable
,
and
accurate
measurements
and
avoids
the
measurement
limitations
due
to
factors
such
as
mutual
inductance
,
interference
of
the
measurement
signals
,
and
unwanted
residual
in
the
test
connections
.
Figure
7-4
shows
the
four-terminal
pair
measurement
principle
.
The
UNKNOWN
terminals
consists
of
four
coaxial
connectors
.
H
CUR
:
High
current
H
POT
:
High
potential
L
POT
:
Low
potential
L
CUR
:
Low
current
Figure
7-4.
F
our-T
erminal
P
air
Measurement
Principle
The
four-terminal
pair
measurement
method
has
the
advantage
in
both
low
and
high
impedance
measurements
.
The
outer
shield
conductors
work
as
the
return
path
for
the
measurement
signal
current
(they
are
not
grounded).
The
same
current
ows
through
both
the
center
conductors
and
outer
shield
conductors
(in
opposite
directions),
so
no
external
magnetic
elds
are
generated
around
the
conductors
(the
magnetic
elds
produced
by
the
inner
and
outer
currents
completely
cancel
each
other).
Therefore
,
test
leads
do
not
contribute
additional
errors
due
to
self
or
mutual
inductance
between
the
individual
leads
.
7-6
Impedance
Measurement
Basics
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Содержание 4263B
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