LCX_UserManual_en_08_1.pdf - 第50页
Measurement basics R&S ® LCX Series 50 User Manual 1 179.2260.02 ─ 08 R ( Ω ) Resistance X s ( Ω ) Reactance Y (S) Admittance |Y| (S) Magnitude of Y G p (S) Equivalent parallel conductance measured with par- allel-eq…
Measurement basics
R&S
®
LCX Series
49User Manual 1179.2260.02 ─ 08
5 Measurement basics
The following graph shows the capacitive and inductive parts of passive components
during impedance measurement in dependency on the frequency and the phase shift.
phase angle
above 45 ° = L
below -45 ° = C
Real axis
Imaginary axis jX
R
Q = D = 1
Q = D = 1
Q = 500
D = 0.002 Ω
|Z| = 1000 Ω
Q = 500
D = 0.002 Ω
Q = 500
D = 0.002 Ω
Q = 500
D = 0.002 Ω
Figure 5-1: Phase angle and integral sections
L = inductance
R = resistance
C = capacitance
|Z| = impedance
D = dissipation factor
Q = quality factor
5.1 Impedance measurement parameters in general
The following table outlines the basic parameters and their definitions:
Table 5-1: Basic parameters and definitions
Parameter (designation and [unit]) Definition
Z (Ω) Impedance
|Z| (Ω) Magnitude of Z
Impedance measurement parameters in general
Measurement basics
R&S
®
LCX Series
50User Manual 1179.2260.02 ─ 08
R (Ω) Resistance
X
s
(Ω) Reactance
Y (S) Admittance
|Y| (S) Magnitude of Y
G
p
(S) Equivalent parallel conductance measured with par-
allel-equivalent circuit model
B
p
(S) Susceptance
Imaginary part of Y
Q Quality factor (inverse of D)
D or tanδ Dissipation factor
Θ
r
(rad) Phase angle of impedance/admittance (radian)
Θ
d
(°) Phase angle of impedance/admittance (degree)
φ (rad, °) Phase angle of Y
C
s
(F) Capacitance value measured with series-equivalent
circuit model
C
p
(F) Capacitance value measured with parallel-equiva-
lent circuit model
L
s
(H) Inductance value measured with series-equivalent
circuit model
L
p
(H) Inductance value measured with parallel-equivalent
circuit model
R
s
or ESR (Ω) Equivalent series resistance measured with series-
equivalent circuit model
R
p
(Ω) Equivalent parallel resistance measured with paral-
lel-equivalent circuit model
R
DC
(Ω) Direct current resistance
V
DC
(V) Direct current voltage
I
DC
(A) Direct current electricity
q
d
(°) Phase angle of impedance/admittance (degree)
q
r
(rad) Phase angle of impedance/admittance (radian)
5.2 Impedance measurement parameters of the R&S LCX
In addition to the characterization of the resistance, inductance and capacity of passive
components, the R&S LCX determines parameters like the quality factor (Q), the dissi-
pation factor (D), the phase angle (Θ), and the complex values of the impedance (Z)
and the admittance (Y).
The following tables show the parameter pairs that you can select for display.
Impedance measurement parameters of the R&S
LCX
Measurement basics
R&S
®
LCX Series
51User Manual 1179.2260.02 ─ 08
Table 5-2: Resistance measurement parameters
Parameter Designation and unit
Rs-X serial resistance (Ω) - reactance (Ω)
Rp-B parallel resistance (Ω) - susceptance (Ω)
Rdc DC current resistance (Ω) - reactance (Ω)
G-B conductance (S) - susceptance (Ω)
Z-Θr impedance (Ω) - phase angle (rad)
Z-Θd impedance (Ω) - phase angle (°)
Y-Θr admittance (S) - phase angle (rad)
Y-Θd admittance (S) - phase angle (°)
Table 5-3: Capacitor measurement parameters
Parameter Designation and unit
Cs-Q serial capacitance (F) - quality factor
Cs-D serial capacitance (F) - dissipation factor
Cs-Rs serial capacitance (F) - serial resistance (Ω)
Cp-Q parallel capacitance (F) - quality factor
Cp-D parallel capacitance (F) - dissipation factor
Cp-Rp parallel capacitance (F) - parallel resistance (Ω)
Cp-G parallel capacitance (F) - conductance (S)
G-B conductance (S) - susceptance (Ω)
Z-Θr impedance (Ω) - phase angle (rad)
Z-Θd impedance (Ω) - phase angle (°)
Y-Θr admittance (S) - phase angle (rad)
Y-Θd admittance (S) - phase angle (°)
Table 5-4: Inductor measurement parameters
Parameter Designation and unit
Ls-Q serial inductance (H) - quality factor
Ls-D serial inductance (H) - dissipation factor
Ls-Rs serial inductance (H) - serial resistance (Ω)
Lp-Q parallel inductance (H) - quality factor
Lp-D parallel inductance (H) - dissipation factor
Lp-Rp parallel inductance (H) - resistance (Ω)
Lp-G parallel inductance (H) - conductance
Rs-X serial resistance (Ω) - reactance (Ω)
Impedance measurement parameters of the R&S LCX