BASIC
MEASUREMENT
37
Reactance (X) and Susceptance (B = 1/X)
Background
Reactance measures the imaginary part of
Impedance (Z) caused by capacitors or inductors.
Susceptance is the reciprocal of Reactance and
measures the imaginary part of Admittance (Y),
which is also the reciprocal of Impedance.
Type
Series Reactance (X
S
)
Note: Reactance is
available only in series
circuit model.
Parallel Susceptance (B
P
)
Note: Susceptance is
available only in parallel
circuit model.
Range
0.01m
Ω
~ 1G
Ω
0.001nS
~
1GS
Measurement
combination
•
X
S
+ Q
•
X
S
+ D
•
X
S
+ R
S
•
B
P
+ Q
•
B
P
+ D
•
B
P
+ R
P
•
B
P
+ G
P
Formula
θ
sin
1
Z
B
X
=
=
(
)
2
2
X
R
Z
S
+
=
(
)
2
2
X
R
RX
Z
P
+
=
θ
sin
Z
X
S
=
θ
sin
1
Y
X
B
=
=
(
)
2
2
B
G
GB
Y
S
+
=
(
)
2
2
B
G
Y
P
+
=
θ
sin
Y
B
P
=
LCR-8101
User
Manual
38
Impedance (Z) and Admittance (Y = 1/Z)
Background
Impedance measures the total amount of
opposition between two terminals in an AC circuit.
Admittance is the reciprocal of Impedance and
measures how easily the electricity flows in an AC
circuit.
Type
Impedance (Z)
Admittance (Y)
Range
0.01m
Ω
~ 1G
Ω
0.001nS
~
1GS
Formula
Y
I
E
Z
1
=
=
jX
R
Z
S
+
=
C
j
R
L
j
R
ϖ
ϖ
−
=
+
=
(
)
2
2
X
R
Z
S
+
=
(
)
2
2
X
R
RX
Z
P
+
=
θ
cos
Z
R
S
=
θ
sin
Z
X
S
=
Z
E
I
Y
1
=
=
jB
G
Y
P
+
=
L
j
G
C
j
G
ϖ
ϖ
−
=
+
=
(
)
2
2
B
G
GB
Y
S
+
=
(
)
2
2
B
G
Y
P
+
=
θ
cos
Y
G
P
=
θ
sin
Y
B
P
=