9
Actual inductors, capacitors and resistors are not ideally pure reactance or resistance
components, but the complex impedance components presented by series or parallel way.
This meter calculates the required values on the base of equivalent series or parallel
circuit. Different equivalent circuits will cause different results. Both equivalent circuits can
switch each other by the formulas as listed in figure 4.1. For Q and D, no matter what the
equivalent way is, the result is the same.
Figure 4.1
Equivalent circuit
Circuit
Dissipation D
Equivalent way
Q, D, Xs definition; Q=Xs/Rs, D=Rs/Xs, Xs=1/2πFCs=2πFLs
Note:
for component parameters, subscript s means equivalent series, p means
equivalent parallel.
Generally, for low-value impedance components(high-value capacitors and low-value
inductors), we should use equivalent series circuit; In contrast, for high-value impedance
components(low-value capacitors and high-value inductors), we should use equivalent
parallel circuit. But Meanwhile, we must choose the equivalent circuit according to actual
situation, for example, the capacitor, when it's used for power filter, should use equivalent
series circuit; when it's used for LC oscillation circuit, should use equivalent parallel circuit.
4.5 Range
2811D/2817B/2816C uses 5 ranges totally: 10Ω, 100Ω, 1kΩ, 10kΩ and 100kΩ.
Range can choose auto or hold status. Measuring range will base on the impedance
of sample and each effective measuring span, no matter the sample is capacitor or
Содержание 2811C
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