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4263B
Selecting
Circuit
Model
for
Inductance
Measurement
The
following
description
gives
some
practical
guide
lines
for
selecting
the
appropriate
inductance
measurement
circuit
model.
Small
Inductance
V
alues
F
or
low
values
of
inductance
the
reactance
is
typically
small
so
Rs
is
more
signicant.
Therefore
,
the
series
circuit
model
(Ls-D
,
Ls-Q,
or
Ls-Rs)
is
appropriate
.
(Refer
to
Figure
7-3
(a).)
Large
Inductance
V
alues
Conversely
for
large
inductances
,
the
reactance
is
typically
large
,
so
Rp
becomes
more
signicant
than
Rs
.
So
,
a
measurement
in
the
parallel
circuit
model
(Lp-D
,
Lp-Q,
or
Lp-G)
is
more
suitable
.
(Refer
to
Figure
7-3
(b).)
Figure
7-3.
Inductance
Circuit
Model
Selection
The
following
are
rules
of
thumb
for
selecting
the
circuit
model
according
to
the
reactance
of
the
inductor
.
Above
approx.
10
k
:
Use
the
parallel
circuit
model
Below
approx.
10
:
Use
the
series
circuit
model
Between
above
values
:
F
ollow
the
manufacturer's
recommendation
F
or
example
,
to
measure
a
1
H
inductor
at
1
kHz
(reactance
is
approximately
6.3
m),
the
series
circuit
model
is
suitable
.
Impedance
Measurement
Basics
7-5
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Summary of Contents for 4263B
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