Measurement Uncertainty of Radiated Emissions (Classic Reprint) - Hardcover

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Excerpt from Measurement Uncertainty of Radiated Emissions

A diagram for a generic radiated emissions measurement is shown in figure 1. The equipment under test (eut) could be any electronic device, such as a digital computer, that is capable of emitting electromagnetic radiation. We include cables in figure 1 because they typically affect radiated emissions. In a formal compliance test, the measurement setup and procedure are normally specified in detail, but many other radiated emissions measurements are made without set procedures. This report covers both cases because they involve the same radiated field measurement issues and uncertainties.

The measurement facility could be an outdoor facility, such as an open area test site (oats) as specified by the Federal Communications Commission (fcc) for measuring radiated emissions from computing devices or an indoor shielded facility, such as an anechoic chamber or a reverberation chamber. The receiving antenna could be any well characterized antenna. A narrowband example is a half-wavelength, tuned dipole, and broadband examples are biconical and log-periodic antennas. A typical receiver is a spectrum analyzer, and in formal compliance tests a minimum receiver bandwidth is normally specified.

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