Keysight E4980A - Page 188

188 Keysight E4980A/AL Precision LCR Meter
Measurement Procedure and Examples
Impedance Parameters
7-
Figure 7-2 Definition of Impedance
The following parameters can be used to represent the reactance.
where
In addition to these parameters, the Quality Factor (Q) and Dissipation Factor
(D) are used to describe the quality of components.
where
In some case, for the inverse of impedance (Admittance), Y is used. Figure 7-3
shows the vector representation of admittance. As with Z (Impedance), Y
contains a real and an imaginary part, and it is expressed in rectangular form
as Conductance and Susceptance, or in polar form as magnitude of
Admittance and Phase. The following are expressions for Admittance.
㪼㪋㪐㪏㪇㪸㫌㪼㪈㪇㪎㪋
㪩㪼㪸㫃㩷㪧㪸㫉㫋
㪠㫄㪸㪾㫀㫅㪸㫉㫐
㪧㪸㫉㫋
㫁㪯
㪩
㱔
㪱
㪭
㪠
㪭
㪠
㪱㩷㪔
㩿㪘㪀㩷㪭㫆㫃㫋㪸㪾㪼㪃㩷㪚㫌㫉㫉㪼㫅㫋
㩷㩷㩷㩷㩷㪸㫅㪻㩷㪠㫄㫇㪼㪻㪸㫅㪺㪼
㩿㪙㪀㩷㪭㪼㪺㫋㫆㫉㩷㪩㪼㫇㫉㪼㫊㪼㫅㫋㪸㫋㫀㫆㫅
㩷㩷㩷㩷㩷㫆㪽㩷㪠㫄㫇㪼㪻㪸㫅㪺㪼
㪱
f Test frequency [Hz]
L Inductance [H]
QQuality Factor
D Dissipation Factor
X2fL=
Q
1
D
---
X
R
------
==
Y
1
Z
--
=