29
Series and Parallel Equivalent Circuits
Generally, as illustrated in Figure 3-2, any non-ideal component has a different
value for a series or parallel equivalent circuit due to the characteristics of the
component. The “quality” of an inductor is expressed by Q, the ratio of the
reactive (inductive) part of its impedance to its resistive part. The quality of a
capacitor is similarly defined, as summarized in Table 3-8. Often it is more useful
to calculate a capacitor’s “dissipative factor,” which is the inverse of its Q
. As Q
for inductors decreases towards 10 and Q for resistors or D for capacitors
increase towards 0. 1, the series and parallel circuit values begin to diverge. Most
components have an approximate value for the series equivalent circuit.
Manufacturers often specify which representation should be used when testing
their devices.
Figure 3-2 Series and Parallel Equivalent Circuits.
Table 3-8 Quality Factors for Equivalent Circuits.
Display Types
The DISP key can select one of five different types of displays. A display is
selected by repeatedly pressing the DISP key until till the LED indicates the
desired display option. These options are described as follows:
VALUE: This is the default display mode when the meter is turned on.
DEV: In the Deviation display mode, the difference between the currently
measured component value and a previously entered value is displayed. The
Deviation display is selected by repeatedly pressing the DISP key until the DEV
W. L. Everett and G. E. Anner, Communication Engineering (3
rd
edition), McGraw-Hill, 1956.
To Next Page
Loading...
Need help?
General
