B&K Precision 886 - Manual - Manual (Page 7)

4
( )
( )
( )
( )
( )
Ohm
Reactance
Resistance
Impedance
1
2 2
= Ω
=
=
=






= =
+ = =
Ω ∠ = + =
−
S
S
s
s
s
s s s
s s
X
R
Z
R
X
Tan Sin Z X
X R Z Cos Z R
Z jX R Z
θ θ
θ
θ
There are two different types of reactance: Inductive (X
L
) and
Capacitive (X
C
). It can be defined as follows:
Also, there are quality factor (Q) and the dissipation factor (D) that
need to be discussed. For component, the quality factor serves as a
measure of the reactance purity. In the real world, there is always
s X
s R
( )
s X , R Z s
Z
θ
Imaginary Axis
Real Axis
Figure 1.1
fC C
X
fL L X
C
L
π ω
π ω
2
1 1
2
= =
= =
L = Inductance (H)
C = Capacitance (F)
f = Frequency (Hz)