BS EN IEC 62153-4-7:2021 – TC
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Tracked Changes. Metallic cables and other passive components test methods – Electromagnetic compatibility (EMC). Test method for measuring of transfer impedance ZT and screening attenuation aS or coupling attenuation aC of connectors and assemblies. Triaxial tube in tube method
| Published By | Publication Date | Number of Pages |
| BSI | 2021 | 148 |
This part of IEC 62153 deals with the triaxial tube in tube method. This triaxial method is suitable to determine the surface transfer impedance and/or screening attenuation and coupling attenuation of mated screened connectors (including the connection between cable and connector) and cable assemblies. This method could also be extended to determine the transfer impedance, coupling or screening attenuation of balanced or multipin connectors and multicore cable assemblies. For the measurement of transfer impedance and screening- or coupling attenuation, only one test set-up is needed.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 86 | undefined |
| 89 | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications |
| 91 | English CONTENTS |
| 95 | FOREWORD |
| 97 | INTRODUCTION |
| 98 | 1 Scope 2 Normative references |
| 99 | 3 Terms and definitions Figures Figure 1 – Definition of ZT |
| 101 | 4 Physical background 5 Principle of the test methods 5.1 General Tables Table 1 – IEC 62153, Metallic communication cable test methods –Test procedures with triaxial test set-up |
| 102 | 5.2 Transfer impedance 5.3 Screening attenuation Figure 2 – Principle of the test set-up to measure transfer impedanceand screening or coupling attenuation of connectors with tube in tube |
| 103 | 5.4 Coupling attenuation |
| 104 | 6 Test procedure 6.1 General 6.2 Tube in tube procedure Figure 3 – Principle of the test set-up to measure transfer impedanceand screening attenuation of a cable assembly |
| 105 | 6.3 Test equipment 6.4 Calibration procedure |
| 106 | 6.5 Connection between extension tube and device under test 6.6 Dynamic range respectively noise floor |
| 107 | 6.7 Impedance matching 6.8 Influence of adapters Figure 4 – Principle set-up for verification test |
| 108 | 7 Sample preparation 7.1 Coaxial connector or device 7.2 Balanced or multiconductor device |
| 110 | 7.3 Cable assembly 8 Measurement of transfer impedance 8.1 General 8.2 Principle block diagram of transfer impedance Figure 5 – Preparation of balanced or multiconductor connectors |
| 111 | 8.3 Measuring procedure – Influence of connecting cables 8.4 Measuring 8.5 Evaluation of test results Figure 6 – Test set-up (principle) for transfer impedance measurementaccording to test of IEC 6215343 with load resistor in inner circuitand without damping resistor in outer circuit |
| 112 | 8.6 Test report 9 Screening attenuation 9.1 General 9.2 Impedance matching 9.2.1 General |
| 113 | 9.2.2 Evaluation of test results with matched conditions Figure 7 – Measuring the screening attenuation with tube in tubewith impedance matching device |
| 114 | 9.2.3 Measuring with mismatch 9.2.4 Evaluation of test results 9.3 Test report |
| 115 | 10 Coupling attenuation 10.1 General 10.2 Procedure for testing connectors Figure 8 – Coupling attenuation, principle test set-up with 2-port VNA and balun |
| 116 | 10.3 Procedure for testing cable assemblies Figure 9 – Coupling attenuation, principle set-up with multiport VNAand TP‑connecting unit Figure 10 – Coupling attenuation, principle test set-up with multiport VNA and TP‑connecting unit for measuring complete cable assemblies |
| 117 | 10.4 Evaluation of test results when using a balun 10.5 Evaluation of test results when using a multiport VNA Figure 11 – Coupling attenuation, principle test set-up with multiport VNAand TP‑connecting unit for measuring halved cable assemblies |
| 118 | 10.6 Test report Figure 12 – Typical measurement of a connector of 0,04 m lengthwith 1 m extension tube |
| 119 | Annexes Annex A (normative) Determination of the impedance of the inner circuit |
| 120 | Annex B (informative) Example of a self-made impedance matching adapter Figure B.1 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter, log scale |
| 121 | Figure B.2 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter, lin scale |
| 122 | Annex C (informative) Measurements of the screening effectiveness of connectors and cable assemblies C.1 General C.2 Physical basics C.2.1 General coupling equation |
| 123 | Figure C.1 – Equivalent circuit of coupled transmission lines |
| 124 | C.2.2 Coupling transfer function Figure C.2 – Summing function S |
| 125 | Figure C.3 – Calculated coupling transfer function (l = 1 m; er1 = 2,3; er2 = 1; ZF = 0) |
| 126 | C.3 Triaxial test set-up C.3.1 General Figure C.4 – Triaxial set-up for the measurement of the screening attenuation aS and the transfer impedance ZT |
| 127 | C.3.2 Measurement of cable assemblies |
| 128 | C.3.3 Measurement of connectors Figure C.5 – Simulation of a cable assembly (logarithmic scale) Figure C.6 – Simulation of a cable assembly (linear scale) |
| 129 | Figure C.7 – Triaxial set-up with extension tube for short cable assemblies Figure C.8 – Triaxial set-up with extension tube for connectors |
| 130 | Figure C.9 – Simulation,logarithmic frequency scale Figure C.10 – Measurement,logarithmic frequency scale Figure C.11 – Simulation,linear frequency scale Figure C.12 – Measurement,linear frequency scale |
| 131 | C.4 Conclusion Figure C.13 – Simulation,logarithmic frequency scale Figure C.14 – simulation,linear frequency scale |
| 132 | Annex D (informative) Influence of contact resistances Figure D.1 – Contact resistances of the test set-up Figure D.2 – Equivalent circuit of the test set-up |
| 134 | Annex E (informative) Direct measurement of screening effectiveness of connectors E.1 Scope E.2 Test set-up Figure E.1 – Principle of the test set-up to measure transfer impedance and screening attenuation of a connector |
| 135 | E.3 Construction details of test set-up Figure E.2 – Principle of the test set-up to measure transfer impedance and screening attenuation of a cable assembly Figure E.3 – Example of sample preparing |
| 136 | Figure E.4 – Screening tube with separate nut Figure E.5 – Screening fixed with associated nut |
| 137 | Annex F (normative) Mixed mode S-parameters F.1 General F.2 Definition of mixed mode S-parameters Figure F.1 – Common two-port network Figure F.2 – Common four port network |
| 138 | Figure F.3 – Physical and logical ports of a VNA Figure F.4 – Nomenclature of mixed mode S-parameters |
| 139 | Figure F.5 – Measurement configuration, single ended response |
| 140 | F.3 Reference impedance of a VNA Figure F.6 – Measurement configuration, differential mode response |
| 141 | Annex G (normative) Accessories for measuring coupling attenuation G.1 TP connecting unit G.2 Termination of the DUT Table G.1 – TP-connecting unit performance characteristics (100 kHz to 2 GHz) |
| 142 | G.3 Test adapter G.3.1 General G.3.2 Direct feeding with coaxial cables Figure G.1 – Termination of the device under test, principle |
| 143 | G.3.3 Balanced feeding cable G.3.4 Movable short circuit Figure G.2 – Balunless measurement of coupling attenuationof a balanced connector, direct feeding, principle Figure G.3 – Balunless measurement of coupling attenuation of a cable assembly using balanced feeding cable, principle |
| 144 | Figure G.4 – Balunless measurement of coupling attenuation of a cable assembly using adapters with implemented short circuit, principle |
| 145 | Annex H (informative) Low frequency screening attenuation Figure H.1 – Example for a screening attenuation test result ofa cable assembly with a test length of 2 meters |
| 146 | Bibliography |
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