Agilent Technologies 4294A Specifications download pdf (Page 75)

SECTION 5

Impedance measurement applications and enhancements

Impedance measurement instruments are used for a wide variety of applications. In this section we

present practical measurement examples based on real life applications. Also, special measurement

techniques are covered to expand the range of impedance measurement applications.

5-1. Capacitor measurement

Capacitors are one of the primary components used in electronic circuits. The basic structure of a

capacitor is a dielectric material sandwiched between two electrodes. The many available types of

capacitors are classed according to their dielectric types. Figure 5-1 shows the range of generic

capacitance values and Table 5-1 lists the features of the different types of capacitors according to

their dielectric classification. Capacitance C, dissipation factor D, and equivalent series resistance

(ESR) are the parameters generally measured.

A typical equivalent circuit for a capacitor is shown in Figure 5-2. In this circuit, the capacitance

value C is the main element of the capacitor. Rs and L are the parasitics existing in the lead wires

and electrodes. Rp is a parasitic that represents leakage between the two electrodes.

Figure 5-1. Capacitance value by dielectric type

Figure 5-2. Capacitor equivalent circuit

5-1

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Agilent Technologies 4294A Specifications Page 75