Download Electromagnetic Compatibility by David Weston PDF
By David Weston
This positively revised and multiplied reference/text offers finished, single-source assurance of the layout, challenge fixing, and requisites of electromagnetic compatibility (EMC) into electric equipment/systems-including new details on uncomplicated theories, functions, reviews, prediction suggestions, and sensible diagnostic techniques for combating EMI via comparatively cheap recommendations. bargains the latest instructions, defense limits, and criteria for human publicity to electromagnetic fields! Containing up-to-date facts on EMI diagnostic verification measurements, in addition to over 900 drawings, photos, tables, and equations-500 greater than the former edition-Electromagnetic Compatibility: ideas and functions, moment variation:
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Example text
For example, Eq. 28) may be used to obtain the approximate value of the radial inductiodnear field when the radius of the loop is less than the measuring distance. 28) should always be used when the measuring distance is greater than six times the radius of the loop. At low frequencies and for distances closer than the radius of the loop, Eq. l), which provides the DC or quasi-static radial field, should be used. 14 E and H fields vs. distance. 14. , the wave impedance) has been plotted. 7 m. 9, and this is called a rn(Ipetic or low-inll,edrrrzce~eld).
13. 17b Radiationpatternfor a large loop, E,, P = h. E and H, Fields, Radiators, Receptors, and Antennas Figure 2 . 1 7 ~ Radiation pattern for a large loop, Eo, P = 39 h. lh and h, respectively. With the large loop in addition to the E, field, which is small in the vertical plane, a second component E,, which has a maximum value in the vertical plane and is zero in the horizontal plane, is generated. Figure 2 . 1 7 ~shows the radiation pattern for the Eo field. 1. 21. 18 from Ref. 5. 6 Far-Field Radiation from a Twisted Wire Pair The EMC literature contains a model for the prediction of radiation from a twisted pair based on the model of a helix described in Ref.
The preceding summary of measured spectrum occupancy and radiated emission levels from unintentional and intentional sources is intended to provide guidelines to manufacturers whose equipment must achieve EMCin these harsh environments. One important piece of information presented with the data is the measuring distance from the source. In measurements it has been observed that the low-frequency component falls more rapidly with increasingdistance than those at VHF and UHF. The mechanism for E field reduction with distance and frequency is discussed in Chapter 2.