Memoq MR-720 Manuel d'utilisateur télécharger pdf (Page 12)

SR715/720 LCR METER

Series and Parallel circuit models

Rs in capacitors is often referred to as ESR or

equivalent series resistance. It includes things like

dielectric absorption in addition to the ohmic

losses due to the leads. It is often listed on data

sheets for electrolytic capacitors used in switching

power supplies. At high frequencies, the ESR is

the limiting factor in the performance of the

capacitor.

The quality factor, Q, is the ratio of the imaginary

impedance to the real impedance. For inductors, a

high Q indicates a more reactively pure

component. A low Q indicates a nearly pure

resistor. Q varies with frequency. Q is commonly

used to describe inductors. With resistors, often all

that is stated is that the resistor has low

inductance.

The dissipation factor, D, is equal to 1/Q and is the

ratio of the real impedance to the imaginary

impedance. A low D indicates a nearly pure

capacitor. D is commonly used when describing

capacitors of all types.

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Memoq MR-720 Manuel d'utilisateur Page 12