BK Precision 894 User Manual

45
Figure 16 - Equivalent Capacitor Circuit
Inductance
The impedance of an inductor is positively proportional. Therefore, the larger inductances
equals to higher impedance and vice versa. Figure 17 shows the equivalent circuit of an
inductor. When the inductance is small, the series resistance (R
S
) becomes more important
than the parallel resistance (R
P
). When the inductance is large, the parallel resistance
should be taken into consideration. Therefore, it is recommended to use the series model
to measure an inductor with low inductance and parallel model to measure an inductor
with high inductance.
Figure 17 - Equivalent Inductor Circuit
Generally, if the impedance is greater than 100 Ω* use the parallel circuit model. Use the
series circuit model when the impedance is less than 100 Ω*.
*Note: This is only a typical value. In all cases, it is best to check with the manufacturer’s
data sheet in order to determine the best model to use for measurement.
The following table translates this approximate impedance rule into inductance and
capacitance values:
Small Capacitor
(High Z)
R
P
Less relevant
C
Large Capacitor
(Low Z)
R
P
Relevant
C
R
S
Less relevant
R
S
Relevant
Large Inductor
(High Z)
R
P
Less Relevant
L
Small Inductor
(Low Z)
R
P
Relevant
L
R
S
Less Relevant
R
S
Relevant
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BK Precision 894 Specifications

General

Brand	BK Precision
Model	894
Category	Measuring Instruments
Language	English