B&K Precision 889B - Manual - Manual (Page 31)

30
 Inductor
The impedance and inductance of a inductor are positively proportional when test frequency is fixed.
Therefore, the larger inductance equals to higher impedance and vice versa. Figure 4.9 shows the equivalent
circuit of inductor. When the inductance is small, the Rs becomes more important than the Rp. When the
inductance is large, the Rp should be taking into consideration. Therefore, it is properly using series mode to
measure an inductor with low inductance and parallel mode to measure an inductor with high inductance.
Small capacitor
(High impedance)
R
P
C
R
S
Effect
No Effect
Large capacitor
(Low impedance)
R
P
C
R
S
Effect
No Effect
Figure 4.9
Small inductor
(Low impedance)
R
P
L
R
S
Large inductor
(High impedance)
Effect
No Effect
R
P
L
R
S
No Effect
Effect