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BS EN IEC 62153-4-7:2021

BS EN IEC 62153-4-7:2021

$198.66

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 64
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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
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
11 FOREWORD
13 INTRODUCTION
14 1 Scope
2 Normative references
15 3 Terms and definitions
Figures
Figure 1 – Definition of ZT
17 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
18 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
19 5.4 Coupling attenuation
20 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
21 6.3 Test equipment
6.4 Calibration procedure
22 6.5 Connection between extension tube and device under test
6.6 Dynamic range respectively noise floor
23 6.7 Impedance matching
6.8 Influence of adapters
Figure 4 – Principle set-up for verification test
24 7 Sample preparation
7.1 Coaxial connector or device
7.2 Balanced or multiconductor device
26 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
27 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
28 8.6 Test report
9 Screening attenuation
9.1 General
9.2 Impedance matching
9.2.1 General
29 9.2.2 Evaluation of test results with matched conditions
Figure 7 – Measuring the screening attenuation with tube in tubewith impedance matching device
30 9.2.3 Measuring with mismatch
9.2.4 Evaluation of test results
9.3 Test report
31 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
32 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
33 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
34 10.6 Test report
Figure 12 – Typical measurement of a connector of 0,04 m lengthwith 1 m extension tube
35 Annexes
Annex A (normative) Determination of the impedance of the inner circuit
36 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
37 Figure B.2 – Attenuation and return loss of a 50 Ω to 5 Ω impedance matching adapter, lin scale
38 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
39 Figure C.1 – Equivalent circuit of coupled transmission lines
40 C.2.2 Coupling transfer function
Figure C.2 – Summing function S
41 Figure C.3 – Calculated coupling transfer function (l = 1 m; er1 = 2,3; er2 = 1; ZF = 0)
42 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
43 C.3.2 Measurement of cable assemblies
44 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)
45 Figure C.7 – Triaxial set-up with extension tube for short cable assemblies
Figure C.8 – Triaxial set-up with extension tube for connectors
46 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
47 C.4 Conclusion
Figure C.13 – Simulation,logarithmic frequency scale
Figure C.14 – simulation,linear frequency scale
48 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
50 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
51 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
52 Figure E.4 – Screening tube with separate nut
Figure E.5 – Screening fixed with associated nut
53 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
54 Figure F.3 – Physical and logical ports of a VNA
Figure F.4 – Nomenclature of mixed mode S-parameters
55 Figure F.5 – Measurement configuration, single ended response
56 F.3 Reference impedance of a VNA
Figure F.6 – Measurement configuration, differential mode response
57 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)
58 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
59 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
60 Figure G.4 – Balunless measurement of coupling attenuation of a cable assembly using adapters with implemented short circuit, principle
61 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
62 Bibliography

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BS EN IEC 62153-4-7:2021
$198.66