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IEVref:312-06-18ID:
Language:enStatus: Standard
Term: input impedance
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Definition: impedance of the input circuit measured between the input terminals under operating conditions

NOTE 1 – The impedance can be expressed in terms of admittance.

NOTE 2 – In certain instances, for example, sampling devices or self-balancing potentiometers, the impedance can be different according to the instant when it is determined, before, during or after the instant of measurement.

NOTE 3 – When the input circuit is such that the instantaneous value of the current flowing into the input terminals is a non-linear function of the instantaneous value of the input voltage under specified conditions of frequency and voltage, the combination of resistance and reactance which would absorb the same active power and in which would flow a reactive current equal to the fundamental component that is flowing in the actual input circuit, is sometimes called the "equivalent input impedance".


Publication date:2001-07
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