16
AT811 User’s Manual
4.1.1
Testing Parameters
【
FUNC
】
Testing parameters
【
FUNC
】
have the following:
L-Q, C-D, R-Q, Z-d, Z-Q, AUTO
AUTO item is automatic parameters selection
UNIT:
L
µ
H
mH
H
C
pF
nF
µ
F
R/Z
Ω
k
Ω
M
Ω
4.1.2
Equivalent Mode
【
EQU
】
Equivalent way
【
EQU
】
includes two choices:
SER
：
Series Equivalent (Series abbr. SER)
PAL
：
Parallel Equivalent (Parallel abbr. PRL)
Actual capacitance, inductance and resistance are not the ideal purely reactive and purely resistive
components, they are usually resistance and reactance components exist.
A real impedance component may be represented by ideal resistors and ideal reactors (inductors or
capacitors) used to simulate the form of series or parallel.
AT811 can be used in the mathematical formula to convert, but the two forms are
different. The inconsistency depends on the quality factor Q (or loss D)
Table 4-1
Transformational relation between series & parallel
Circuit Type
Loss Factor
Series & Paraller
Transformation
C
Cp
Rp
Q
R
fC
D
P
p
1
2
1
=
=
p
)
1
(
)
1
(
2
2
2
D
D
R
R
C
D
C
P
S
P
S
+
=
+
=
Cs
Rs
Q
C
fR
D
S
S
1
2
=
=
p
2
2
2
)
1
(
)
1
(
1
D
D
R
R
C
D
C
S
P
S
P
+
=
+
=
L
Lp
Rp
Q
R
fL
D
P
P
1
2
=
=
p
)
1
(
)
1
(
1
2
2
2
D
D
R
R
L
D
L
P
S
P
S
+
=
+
=
Lp
Rp
Q
fL
R
D
S
S
1
2
=
=
p
2
2
2
)
1
(
)
1
(
D
D
R
R
L
D
L
S
P
S
P
+
=
+
=
Here: Subscript “s” is series form
Subscript “p” is parallel form
The above formula, should pay particular attention are: the conversion between serial and parallel
relations with D² or Q²
（
Q=1/D
）
related. D² value directly affects the size of the size of its value, the
following cases of capacitors description:
A capacitor, the series equivalent capacitance are Cs=0.1μF, and the loss were D1=0.0100,
D2=0.1000, D3=1.0000, the formula under the table, parallel equivalent capacitance should be:
Cp1 = 0.09999
µ
F
