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BS EN 50289-1-11:2016 – TC:2020 Edition

BS EN 50289-1-11:2016 – TC:2020 Edition

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Tracked Changes. Communication cables. Specifications for test methods – Electrical test methods. Characteristic impedance, input impedance, return loss

Published By Publication Date Number of Pages
BSI 2020 86
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This Part of EN 50289 details the test methods to determine characteristic impedance, input impedance and return loss of cables used in analogue and digital communication systems. It is to be read in conjunction with EN 50289-1-1, which contains essential provisions for its application.

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PDF Pages PDF Title
48 Contents Page
50 European foreword
51 1 Scope
2 Normative references
3 Terms and definitions
54 Figure 1 — Return loss with and without junction reflections
Figure 2 — Return loss and open/short return loss
55 Figure 3 — Return loss, open short return loss and structural return loss
56 4 Test method for mean characteristic impedance (S21 type measurement)
4.1 Principle
4.2 Expression of test results
5 Test method for input impedance and return loss (S11 type measurement)
5.1 Method A: measurement of balanced cables using balun setup
5.1.1 Test Equipment
57 Figure 4 — T-resistor network
5.1.2 Test sample
5.1.3 Calibration procedure
58 Figure 5 — Calibration set-up
5.1.4 Measuring procedure
5.2 Method B: measurement of balanced cables using balun-less setup
5.2.1 Test Equipment
59 5.2.2 Test sample
5.2.3 Calibration procedure
5.2.4 Measuring procedure
60 5.3 Method C: measurement of coaxial cables
5.3.1 Test Equipment
5.3.2 Test sample
5.3.3 Calibration procedure
61 5.3.4 Measuring procedure
5.4 Expression of test results
63 6 Test report
64 Annex A (normative) Function fitting of input impedance
A.1 General
A.2 Polynomial function for function fitting of input impedance
65 A.3 Fewer terms
67 Annex B (normative) Correction procedures for the measurement results of return loss and input impedance
B.1 General
Figure B.1 — Input impedance (magnitude) and operational return loss up to 2 GHz
B.2 Parasitic inductance corrected return loss (PRL)
68 Figure B.2 — Equivalent circuit for the corrective calculation
69 B.3 Gated return loss (GRL)
71 Figure B.3 — Return loss with gating correction
B.4 Fitted return loss (FRL)
74 Figure B.4 — Return loss and input impedance before any correction
75 Figure B.5 — Return loss and input impedance (with fitting) after fixture correction
Figure B.6 — Residual impedance (after fixture correction) and its fitting
Figure B.7 — Return loss and input impedance after complete correction
76 Figure B.8 — Return loss, with fixture correction vs. without fixture correction
Figure B.9 — Input impedance (real and imaginary part), with fixture correction vs. without fixture correction
77 B.5 Comparison of gated return loss (GRL) with fitted return loss (FRL)
Figure B.10 — Return loss, fitting vs. gating correction
Figure B.11 — Real part of input impedance, fitting vs. gating correction
78 Figure B.12 — Imaginary part of input impedance, fitting vs. gating correction
B.6 Influence of the correction technique on return loss peaks
Figure B.13 — Reflection coefficient of a Cat.6 data cable in polar coordinates without and with PRL-correction
79 Figure B.14 — Return loss traces corresponding to Figure B.13
Figure B.15 — Reflection coefficient of a Cat.6 data cable in polar coordinates without and with PRL-correction
Figure B.16 — Return loss traces corresponding to Figure B.15
81 Annex C (normative) Termination loads for termination of conductor pairs
C.1 General
Figure C.1 — Resistor termination networks
82 C.2 Verification of termination loads
Table C.1 — Requirements for terminations at calibration plane
83 Bibliography

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BS EN 50289-1-11:2016 - TC
$217.84