BASIC
MEASUREMENT
31
Measurement Item Description
In general, two items, primary and secondary, are combined in a
single measurement. The following table shows the available
combinations. Overview of each measurement items is listed from
the next page.
Measurement combination
:Yes
:No
1st measurement
2nd measurement
Circuit model Graph Prog
Q
D
R
AC
G Angle Series Parallel
Capacitance (C)
Inductance (L)
Reactance (X)
Susceptance (B)
Impedance (Z)
Admittance (Y)
DC Resistance(R
DC
)
Quality
factor
(Q)
Dissipation factor (D)
AC Resistance (R
AC
)
Conductance
(G)
Angle (
θ
)
*Prog: Multi-step program
•
The graph measurement is described in graph mode chapter,
page75.
•
The multi-step program mode is described in the Pass/Fail test
chapter, page61.
LCR-8101
User
Manual
32
Series/Parallel circuit models
Background
For measuring AC Resistance, Capacitance,
Reactance, Inductance, and Susceptance, series and
parallel equivalent circuit models are available.
Select the model according to the component value.
Capacitance (C) Series diagram
Parallel diagram
Series
formula
(
)
2
1
D
C
C
P
S
+
=
D=dissipation factor
Parallel formula
(
)
2
1
D
C
C
S
P
+
=
D=dissipation factor
When to use Series (C
S
)
Small capacitance:
Reactance (X) < 1k
Ω
Example: 1
μ
F @ 1kHz =
100
Ω
(X)
→
Series
When to use Parallel (C
P
)
Large capacitance:
Reactance (X) > 1k
Ω
Example: 100mF @ 1kHz
= 100k
Ω
(X)
→
Parallel
Inductance (L)
Series diagram
Parallel diagram