IEC TS 62153-4-1-2014 Metallic communication cable test methods - Part 4-1 Electromagnetic compatibiliy (EMC) - Introduction to electromagnetic screening measur.pdf

1、 IEC TS 62153-4-1 Edition 1.0 2014-01 TECHNICAL SPECIFICATION Metallic communication cable test methods Part 4-1: Electromagnetic compatibility (EMC) Introduction to electromagnetic screening measurements IEC TS 62153-4-1:2014-01(EN) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 20

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11、nication cable test methods Part 4-1: Electromagnetic compatibility (EMC) Introduction to electromagnetic screening measurements INTERNATIONAL ELECTROTECHNICAL COMMISSION XD ICS 33.100 PRICE CODE ISBN 978-2-8322-1311-7 Registered trademark of the International Electrotechnical Commission Warning! Ma

12、ke sure that you obtained this publication from an authorized distributor. colour inside 2 TS 62153-4-1 IEC:2014(E) CONTENTS FOREWORD . 7 1 Scope 9 2 Normative references 9 3 Symbols interpretation . 10 4 Electromagnetic phenomena 12 5 The intrinsic screening parameters of short cables 14 5.1 Genera

13、l 14 5.2 Surface transfer impedance, Z T. 14 5.3 Capacitive coupling admittance, Y C. 14 5.4 Injecting with arbitrary cross-sections 16 5.5 Reciprocity and symmetry 16 5.6 Arbitrary load conditions 16 6 Long cables coupled transmission lines 16 7 Transfer impedance of a braided wire outer conductor

14、or screen . 24 8 Test possibilities 30 8.1 General 30 8.2 Measuring the transfer impedance of coaxial cables 30 8.3 Measuring the transfer impedance of cable assemblies 31 8.4 Measuring the transfer impedance of connectors . 31 8.5 Calculated maximum screening level . 31 9 Comparison of the frequenc

15、y response of different triaxial test set-ups to measure the transfer impedance of cable screens . 36 9.1 General 36 9.2 Physical basics 36 Triaxial set-up . 36 9.2.1Coupling equations . 38 9.2.2 9.3 Simulations 40 General 40 9.3.1Simulation of the standard and simplified methods according 9.3.2 to

16、EN 50289-1-6, IEC 61196-1 (method 1 and 2) and IEC 62153-4-3 (method A) 40 Simulation of the double short circuited methods 46 9.3.3 9.4 Conclusion . 54 10 Background of the shielded screening attenuation test method (IEC 62153-4-4) 54 10.1 General 54 10.2 Objectives 55 10.3 Theory of the triaxial m

17、easuring method 55 10.4 Screening attenuation 60 10.5 Normalised screening attenuation 62 10.6 Measured results . 63 10.7 Comparison with absorbing clamp method . 65 10.8 Practical design of the test set-up 66 10.9 Influence of mismatches 67 Mismatch in the outer circuit . 67 10.9.1Mismatch in the i

18、nner circuit . 69 10.9.2TS 62153-4-1 IEC:2014(E) 3 11 Background of the shielded screening attenuation test method for measuring the screening effectiveness of feed-throughs and electromagnetic gaskets (IEC 62153-4-10) . 72 11.1 General 72 11.2 Theoretical background of the test Fixtures and their e

19、quivalent circuit 73 11.3 Pictures and measurement results . 76 Characteristic impedance uniformity . 76 11.3.1Measurements of shielding effectiveness 78 11.3.2Calculation of transfer impedance . 80 11.3.3 11.4 Calculation of screening attenuation for feed-through when the transfer impedance Z Tis k

20、nown . 82 12 Background of the shielded screening attenuation test method for measuring the screening effectiveness of RF connectors and assemblies (IEC 62153-4-7) . 83 12.1 Physical basics 83 Surface transfer impedance Z T. 83 12.1.1Screening attenuation a S84 12.1.2Coupling attenuation a C. 84 12.

21、1.3Coupling transfer function . 84 12.1.4Relationship between length and screening measurements . 85 12.1.5 12.2 Tube in tube set-up (IEC 62153-4-7) 86 General 86 12.2.1Procedure . 86 12.2.2Measurements and simulations . 88 12.2.3Influence of contact resistances 89 12.2.4 Bibliography 91 Figure 1 To

22、tal electromagnetic field ( ) t t ,H E . 12 Figure 2 Defining and measuring screening parameters A triaxial set-up . 13 Figure 3 Equivalent circuit for the testing of Z T15 Figure 4 Equivalent circuit for the testing of Y c = j C T. 15 Figure 5 Electrical quantities in a set-up that is matched at bo

23、th ends . 16 Figure 6 The summing function SLf for near and far end coupling 20 Figure 7 Transfer impedance of a typical single braid screen . 20 Figure 8 The effect of the summing function on the coupling transfer function of a typical single braid screen cable . 21 Figure 9 Calculated coupling tra

24、nsfer functions T nand T f for a single braid Z F = 0 . 21 Figure 10 Calculated coupling transfer functions T nand T f for a single braid Im(Z T ) is positive and Z F = +0,5 Im(Z T ) at high frequencies 22 Figure 11 Calculated coupling transfer functions T nand T ffor a single braid Im(Z T ) is nega

25、tive and Z F = 0,5 Im(Z T ) at high frequencies. 23 Figure 12 LS: the complete length dependent factor in the coupling function T . 24 Figure 13 Transfer impedance of typical cables . 25 Figure 14 Magnetic coupling in the braid Complete flux. 26 Figure 15 Magnetic coupling in the braid Left-hand lay

26、 contribution 26 Figure 16 Magnetic coupling in the braid Right-hand lay contribution 26 Figure 17 Complex plane, Z T = Re Z T+ j Im Z T , frequency f as parameter 27 Figure 18 Magnitude (amplitude), | Z T (f) | . 27 4 TS 62153-4-1 IEC:2014(E) Figure 19 Typical Z T (time) step response of an overbra

27、ided and underbraided single braided outer conductor of a coaxial cable 28 Figure 20 Z Tequivalent circuits of a braided wire screen . 29 Figure 21 Comparison of signal levels in a generic test setup 32 Figure 22 Triaxial set-up for the measurement of the transfer impedance Z T. 36 Figure 23 Equival

28、ent circuit of the triaxial set-up 37 Figure 24 Simulation of the frequency response for g . 41 Figure 25 Simulation of the frequency response for g . 41 Figure 26 Simulation of the frequency response for g . 42 Figure 27 Simulation of the frequency response for g . 42 Figure 28 Simulation of the 3

29、dB cut off wavelength (L/ 1 ) . 43 Figure 29 Interpolation of the simulated 3 dB cut off wavelength (L/ 1 ) 43 Figure 30 3 dB cut-off frequency length product as a function of the dielectric permittivity of the inner circuit (cable) . 44 Figure 31 Measurement result of the normalised voltage drop of

30、 a single braid screen on a solid PE dielectric in the triaxial set-up 45 Figure 32 Measurement result of the normalised voltage drop of a single braid screen on a foam PE dielectric in the triaxial set-up 46 Figure 33 Triaxial set-up (measuring tube), double short circuited method . 47 Figure 34 Si

31、mulation of the frequency response for g of a cable having solid PE dielectric ( r1 =2,3) 48 Figure 35 Simulation of the frequency response for g of a cable having foamed PE dielectric ( r1 =1,6) 48 Figure 36 Simulation of the frequency response for g of a cable having foamed PE dielectric ( r1 =1,3

32、) 49 Figure 37 Simulation of the frequency response for g of a cable having PVC dielectric ( r1 =5) . 49 Figure 38 Interpolation of the simulated 3 dB cut off wavelength (L/ 1 ) 50 Figure 39 3 dB cut-off frequency length product as a function of the dielectric permittivity of the inner circuit (cabl

33、e) . 51 Figure 40 Simulation of the frequency response for g . 52 Figure 41 Interpolation of the simulated 3 dB cut off wavelength (L/ 1 ) 53 Figure 42 3 dB cut-off frequency length product as a function of the dielectric permittivity of the inner circuit (cable) . 53 Figure 43 Definition of transfe

34、r impedance . 55 Figure 44 Definition of coupling admittance 55 Figure 45 Triaxial measuring set-up for screening attenuation . 56 Figure 46 Equivalent circuit of the triaxial measuring set-up . 56 Figure 47 Calculated voltage ratio for a typical braided cable screen . 58 Figure 48 Calculated period

35、ic functions for r1= 2,3 and r2= 1,1 59 Figure 49 Calculated voltage ratio-typical braided cable screen . 59 Figure 50 Equivalent circuit for an electrical short part of the length l and negligible capacitive coupling . 61 Figure 51 a sof single braid screen, cable type RG 58, L = 2 m 63 Figure 52 a

36、 sof single braid screen, cable type RG 58, L = 0,5 m . 64 Figure 53 a sof cable type HF 75 0,7/4,8 2YCY (solid PE dielectric). 64 TS 62153-4-1 IEC:2014(E) 5 Figure 54 a sof cable type HF 75 1,0/4,8 02YCY (foam PE dielectric) 65 Figure 55 a sof double braid screen, cable type RG 223 65 Figure 56 Sch

37、ematic for the measurement of the screening attenuation a s67 Figure 57 Short circuit between tube and cable screen of the CUT 67 Figure 58 Triaxial set-up, impedance mismatches 68 Figure 59 Calculated voltage ratio including multiple reflections caused by the screening case . 69 Figure 60 Calculate

38、d voltage ratio including multiple reflections caused by the screening case . 69 Figure 61 Attenuation and return loss of a self-made 50 to 5 impedance matching adapter 70 Figure 62 equivalent circuit of a load resistance connected to a source . 71 Figure 63 Cross-sectional sketch of a typical feed-

39、through configuration . 72 Figure 64 Cross-sectional sketch of the test fixture with a feed-through connector (a) and EMI gasket (b) under test . 73 Figure 65 Equivalent circuit of the test fixture 74 Figure 66 Two-port network . 74 Figure 67 TDR measurement of the text-fixture with inserted “Teflon

40、-through” sample . 76 Figure 68 TDR step response from A (Input)-port of test fixture with inserted “Teflon- through” sample 77 Figure 69 TDR step response from B (Output)-port of test fixture with inserted “Teflon-through” sample 77 Figure 70 S-parameter measurement (linear sweep): “Teflon-through”

41、 sample . 78 Figure 71 S-parameter measurement (logarithmic sweep): “Teflon-through” sample 78 Figure 72 S parameter test setup . 79 Figure 73 TDR test setup . 79 Figure 74 Test fixture assembled . 79 Figure 75 Detailed views of the contact area the test fixture and the secondary side of side opened

42、 80 Figure 76 S 21measurements 80 Figure 77 S 21measurements of “Teflon-through” and “Sonnenscheibe” feed-through 81 Figure 78 Transfer impedance ZT of a “Sonnenscheibe” feed-through based on the S 21measurement in Figure 77 . 81 Figure 79 measurements of a conducting plastic gasket. 82 Figure 80 Z

43、Tof the conducting plastic gasket based on the S 21measurement in Figure 79 82 Figure 81 equivalent circuit of the set-up without DUT . 82 Figure 82 equivalent circuit of the set-up with inserted DUT . 83 Figure 83 Definition of Z T. 84 Figure 84 Calculated coupling transfer function 85 Figure 85 Pr

44、inciple test set-up for measuring the screening attenuation of a connector with the tube in tube procedure . 86 Figure 86 Principle test set-up for measuring the coupling attenuation of screened balanced or multipin connectors 87 Figure 87 Principle preparation of balanced or multiconductor connecto

45、rs for coupling attenuation 87 6 TS 62153-4-1 IEC:2014(E) Figure 88 Comparison of simulation and measurement, linear frequency scale 88 Figure 89 Comparison of simulation and measurement, logarithmic frequency scale 89 Figure 90 Measurement of the coupling attenuation of a CAT6 connector 89 Figure 9

46、1 Contact resistances of the test set-up 90 Figure 92 Equivalent circuit of the test set-up with contact resistances 90 Table 1 The coupling transfer function T (coupling function) a. 18 Table 2 Screening effectiveness of cable test methods for surface transfer impedance Z T. 34 Table 3 Load conditi

47、ons of the different set-ups . 38 Table 4 Parameters of the different set-ups . 40 Table 5 Cut-off frequency length product . 44 Table 6 Typical values for the factor v, for an inner tube diameter of 40 mm and a generator output impedance of 50 . 47 Table 7 Cut-off frequency length product . 50 Tabl

48、e 8 Material combinations and the factor n 52 Table 9 Cut-off frequency length product . 53 Table 10 Cut-off frequency length product for some typical cables in the different set- ups 54 Table 11 a in dB for typical cable dielectrics 63 Table 12 Comparison of results of some coaxial cables . 66 Table 13 Cable parameters used for simulation . 88 TS 62153-4-1 IEC:2014(E) 7 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METALLIC COMMUNICATION CABLE TEST METHODS Part 4-1: Electromagnetic compatibility (EMC) Introduction to electromagnetic screening measurements FORE