Microtest 6375 - 8.3 Series;Parallel Conversions; 8.4 Polar Derivations

8–2
values)C L, G, (parallel GL
C
G
D
PP
P
P



values)C L, R, (series RC
L
R
D
SS
S
S



convention allelseries/par of regardlessconstant is
D
1
Q valueThe :Note 
8.3 Series/Parallel Conversions
 
2
P
S
Q 1
R
R


 
2
SP
Q 1R R 
 
2
PS
D 1 C C 
 
2
S
P
D 1
C
C












2
P
S
Q
1
1
L
L









2
SP
Q
1
1L L
Conversions using the above formulae will be valid only at the test frequency.
8.4 Polar Derivations
 cos Z R
S
 cos Y G
P
 sin Z X
S
 sin Y B
P
Note that, by convention, +ve angle indicates an inductive impedance or capacitive admittance.
If capacitance is measured as inductance, the L value will be –ve.
If inductance is measured as capacitance, the C value will be –ve.
D = tan δ where δ = (90 – θ)˚ admittance measurement.


tan
1
Q
where δ = (90 – θ)˚ impedance measurement.