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CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt

CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt. Need for new test method: No test methods to measure: symmetrical cables, connecting hardware / cable assemblies balance at higher frequencies combined effect of balance and screening. Introduction.

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CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt

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  1. CORRELATION BETWEEN RADIATED IMMUNITY AND COUPLING ATTENUATION Michiel Pelt

  2. Need for new test method: No test methods to measure: symmetrical cables, connecting hardware / cable assemblies balance at higher frequencies combined effect of balance and screening Introduction

  3. Coupling attenuation New and easy test method to evaluate the EMC performance of channels and components (symmetrical + screened) Standard prepared by CENELEC TC 46X / WG3: EN 50289-1-6 Under discussion in ISO / IEC JTC1 SC25 WG 3 and CLC TC 215 WG 1 Introduction

  4. A near field measurement Introduction

  5. Simplifications Device under test: unshielded twisted pair cable coaxial cable dual foil balanced cable Radiated immunity according to IEC 61000-4-3 fixed position antenna and device Introduction

  6. Coupling attenuation Coupling attenuation

  7. Definition coupling attenuation Coupling attenuation ac = 10 LOG10 ( P1) max[ P2n; P2f ] ac coupling attenuation P1 input power inner circuit P2n maximum near end peak power P2f maximum far end peak power

  8. Limits of coupling attenuation Coupling attenuation

  9. Unshielded twisted pair cable Coupling attenuation 54 dB

  10. Coaxial cable Coupling attenuation 52 dB

  11. Dual foil twisted pair cable Coupling attenuation 86 dB

  12. Radiated immunity Semi-anechoic room (13.2 x 4.7 x 3.0m) Antenna - set-up: 3 m Three amplifiers, two antennas 30 - 200 MHz 200 - 500 MHz 500 - 1000 MHz Incident field: about 3 V/m (not modulated) Radiated immunity

  13. Dimensions cabling set-up Radiated immunity

  14. Justification for cabling set-up Testing active equipment with cabling (proposal to CISPR G) Features cabling set-up: gain / frequency response flat polarization not critical direction not critical (worst case perpendicular to incident field) Radiated immunity

  15. Set-up inside semi-anechoic chamber Radiated immunity

  16. Set-up inside semi-anechoic chamber Radiated immunity

  17. Uniform area of cabling set-up Radiated immunity

  18. Field uniformity according to IEC 61000-4-3 16 points over 1.5 m x 1.5 m surface 75 % values within 0 - 6 dB of nominal value Field is not constant but uniform ( 83% horizontal; 89 % vertical) Radiated immunity

  19. Average field strength Radiated immunity

  20. Unshielded twisted pair cable Radiated immunity -35 dBm

  21. Coaxial cable Radiated immunity -35 dBm

  22. Dual foil twisted pair cable Radiated immunity -70 dBm

  23. Conclusion 1: Relative agreement Same difference between coupling attenuation and induced power for all tested cables For each test method same deviation between curves for balanced and unbalanced cables using Conclusions

  24. Gain of set-up Correlation G() = 4 Af()  G( antenna gain Af( antenna aperture  wavelength

  25. Unshielded twisted pair cable Correlation

  26. Coaxial cable Correlation

  27. Dual foil twisted pair cable Correlation

  28. Conclusion 2: Absolute agreement The induced noise power can be calculated using the values for coupling attenuation The calculated induced power fits the measured powers for all cables Conclusions

  29. Errors during correlation Incident field uniform but not constant Gain set-up varies with frequency Coupling attenuation approached by envelope curve ... Conclusions

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