
30-11Inductance Measurement
be free from harmonic distortions. e dependence of bridge balance conditions on frequency also
li
mits
th
e
me
asurement
ra
nges
. e br
idge
is ba
lanced
by va
rying
R
3
and R
4
resistors and by switching
ca
pacitor
C
3
.
Mu
tual
in
ductance
M of tw
o
wi
ndings
wi
th
se
lf-inductances
L
p
and L
s
can be determined by Maxwell
Wie
n
or Ha
y
br
idges
. Fo
r
th
is,
tw
o
in
ductance
me
asurements
ha
ve
to be ma
de
fo
r
tw
o
po
ssible
co
mbina-
tions
of th
e
se
ries
co
nnection
of bo
th
co
upled
wi
ndings:
on
e
of th
em
fo
r
th
e
co
rresponding
di
rections
of th
e
wi
ndings,
an
d
on
e
fo
r
th
e
op
posite
di
rections
. Tw
o
va
lues
of in
ductances
L
1
and L
2
are obtained
as t
he
r