Tonghui TH2821A - Page 24

TH2821A OPERATION MANUAL
24
Inductance Ls：from series to parallel
Circuit Mode：
Lp Rp
Dissipation：
QfL
R
D
S
S
1
2
==
π
Parallel:
22
2
)1(
)1(
DDRR
LDL
SP
SP
+=
+=
Here parameter with subscript s means the series mode,
parameter with subscript p means the parallel mode.
3. From the above equations, we can conclude that the conversion
between series and parallel is determined by D
2
or Q
2
（Q=1/D）.
The value of D
2
or Q
2
directly determined the parameter values in
different circuit mode.
Example:
Three capacitors have the same series capacitance: Cs=0.1µF, but
their dissipations are different with each other: D1=0.0100,
D2=0.1000, D3=1.0000. According to the above equation, we can
get their capacitance in parallel mode:
Cp1 = 0.09999 µF
Cp2 = 0.09901 µF
Cp3 = 0.05000 µF
We can find that Cs is almost the same with Cp when D is very
small (Ｄ< 0.01), but when D is more than 0.01，Cp and Cs are
different obviously. For example: When D = 0.1，the difference is
1%，but when D = 1，the difference is almost 50%.
3. Alarm Setup
z Press
u key to select the second function, “SHIFT”
will be lighted on the screen.