IEC 62153-4-15:2015
(Main)Metallic communication cable test methods - Part 4-15: Electromagnetic compatibility (EMC) - Test method for measuring transfer impedance and screening attenuation - or coupling attenuation with triaxial cell
Metallic communication cable test methods - Part 4-15: Electromagnetic compatibility (EMC) - Test method for measuring transfer impedance and screening attenuation - or coupling attenuation with triaxial cell
IEC 62153-4-15:2015(E) specifies the procedures for measuring with triaxial cell the transfer impedance, screening attenuation or the coupling attenuation of connectors, cable assemblies and components, e.g. accessories for analogue and digital transmission systems and equipment for communication networks and cabling (in accordance with the scope of IEC technical committee 46). Measurements can be achieved by applying the device under test direct to the triaxial cell or with the tube in tube method in accordance with IEC 62153-4-7.
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IEC 62153-4-15 ®
Edition 1.0 2015-12
INTERNATIONAL
STANDARD
colour
inside
Metallic communication cable test methods –
Part 4-15: Electromagnetic compatibility (EMC) – Test method for measuring
transfer impedance and screening attenuation – or coupling attenuation with
triaxial cell
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IEC 62153-4-15 ®
Edition 1.0 2015-12
INTERNATIONAL
STANDARD
colour
inside
Metallic communication cable test methods –
Part 4-15: Electromagnetic compatibility (EMC) – Test method for measuring
transfer impedance and screening attenuation – or coupling attenuation with
triaxial cell
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100; 33.120.10 ISBN 978-2-8322-3056-5
– 2 – IEC 62153-4-15:2015 © IEC 2015
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions. 8
4 Physical background . 10
5 Principle of the test methods . 10
5.1 General . 10
5.2 Transfer impedance . 11
5.3 Screening attenuation. 12
5.4 Coupling attenuation . 12
5.5 Tube in tube method . 13
6 Test procedures . 13
6.1 General . 13
6.2 Triaxial cell . 13
6.3 Cut off frequencies, higher order modes . 13
6.4 Test equipment . 14
6.5 Calibration procedure . 14
6.6 Test leads and connecting cables to DUT . 15
7 Sample preparation . 15
7.1 Coaxial connector or assembly or quasi-coaxial component . 15
7.2 Balanced or multipin connector or component . 15
7.3 Cable assemblies . 16
7.4 Other screened devices . 17
8 Transfer impedance (short – matched) . 17
8.1 General . 17
8.2 Principle block diagram of transfer impedance . 17
8.3 Measuring procedure . 18
8.4 Evaluation of test results . 18
8.5 Test report . 18
9 Screening attenuation . 19
9.1 General . 19
9.2 Impedance matching . 19
9.3 Measuring with matched conditions . 19
9.3.1 Procedure . 19
9.3.2 Evaluation of test results . 19
9.4 Measuring with mismatch . 20
9.4.1 General . 20
9.4.2 Evaluaton of test results . 20
9.5 Test report . 21
10 Coupling attenuation . 21
10.1 Procedure . 21
10.2 Expression of results . 21
10.3 Test report . 22
11 Coupling transfer function . 22
Annex A (informative) Principle of the triaxial test procedure . 23
Annex B (informative) Triaxial cell . 25
Annex C (informative) Cut off frequencies, higher order modes . 27
Annex D (informative) Coupling transfer function . 30
Annex E (informative) Attenuation versus scattering parameter S . 32
Annex F (informative) Application of a moveable shorting plane . 34
F.1 Effect of the measurement length on the measurement cut-off frequency . 34
F.2 Details of the movable shorting plane . 34
F.3 Measurement results . 36
Annex G (informative) Correction in case the receiver input impedance R is higher
than the characteristic impedance of the outer circuit Z . 37
Bibliography . 39
Figure 1 – Definition of Z . 8
T
Figure 2 – Principle depiction of the triaxial cell to measure transfer impedance and
screening attenuation . 11
Figure 3 – Principle depiction of the triaxial cell to measure transfer impedance and
screening attenuation of assemblies with tube in tube according to IEC 62153-4-7 . 11
Figure 4 – Preparation of balanced or multipin connectors for transfer impedance and
screening attenuation . 16
Figure 5 – Preparation of balanced or multipin connectors for coupling attenuation
measurement . 16
Figure 6 – Test set-up (principle) for transfer impedance measurement according to
test method B of IEC 62153-4-3 . 17
Figure A.1 – Principle test set-up to measure transfer impedance and screening
attenuation . 23
Figure A.2 – Equivalent circuit of the principle test set-up in Figure A.1 . 23
Figure B.1 – Principle depiction of the triaxial cell to measure transfer impedance and
screening attenuation at HV-assemblies with tube in tube according to IEC 62153-4-7 . 25
Figure B.2 – Example of different designs of triaxial cells . 26
Figure C.1 – Comparison of the measurements with tube and with triaxial cell of a RG
11 cable with single braid construction, linear scale . 28
Figure C.2 – Comparison of the measurements with tube and with triaxial cell of a cable
RG 11 with single braid construction, log scale . 29
Figure D.1 – Measured coupling transfer function of a braided screen vs. frequency
with the triaxial cell . 30
Figure E.1 – Measurement with HP8753D of S of a 3dB attenuator . 32
Figure E.2 – Measurement with ZVRE of S of a 3dB attenuator . 33
Figure F.1 – Crosssection of triaxial cell with movable shorting plane. 34
Figure F.2 – Crosscut of plane shortening housing and tube-in-tube . 35
Figure F.3 – Detail H of figure F.2: contact between plane and housing . 35
Figure F.4 – Detail G of figure F.2: contact between plane and tube-in-tube . 36
Figure F.5 – Compilation of transfer impedance test results with different shorting plane
distances . 36
Figure G.1 – Example of forward transfer scattering parameter S for different
impedances in the outer circuit where the receiver input impedance is 50Ω . 37
Figure G.2 – DUT with uniform cylindrical shape in the centre of the cell . 38
– 4 – IEC 62153-4-15:2015 © IEC 2015
Table 1 – IEC 62153-4-x, Metallic communication cable test methods – Test
procedures with triaxial test set-up . 10
Table C.1 – Resonance frequencies of different triaxial cells .
...
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