BS EN 50289-1-11:2016:2017 Edition
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Communication cables. Specifications for test methods – Electrical test methods. Characteristic impedance, input impedance, return loss
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 42 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Contents Page |
| 6 | European foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | Figure 1 — Return loss with and without junction reflections Figure 2 — Return loss and open/short return loss |
| 11 | Figure 3 — Return loss, open short return loss and structural return loss |
| 12 | 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 |
| 13 | Figure 4 — T-resistor network 5.1.2 Test sample 5.1.3 Calibration procedure |
| 14 | 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 |
| 15 | 5.2.2 Test sample 5.2.3 Calibration procedure 5.2.4 Measuring procedure |
| 16 | 5.3 Method C: measurement of coaxial cables 5.3.1 Test Equipment 5.3.2 Test sample 5.3.3 Calibration procedure |
| 17 | 5.3.4 Measuring procedure 5.4 Expression of test results |
| 19 | 6 Test report |
| 20 | Annex A (normative) Function fitting of input impedance A.1 General A.2 Polynomial function for function fitting of input impedance |
| 21 | A.3 Fewer terms |
| 23 | 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) |
| 24 | Figure B.2 — Equivalent circuit for the corrective calculation |
| 25 | B.3 Gated return loss (GRL) |
| 27 | Figure B.3 — Return loss with gating correction B.4 Fitted return loss (FRL) |
| 30 | Figure B.4 — Return loss and input impedance before any correction |
| 31 | 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 |
| 32 | 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 |
| 33 | 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 |
| 34 | 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 |
| 35 | 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 |
| 37 | Annex C (normative) Termination loads for termination of conductor pairs C.1 General Figure C.1 — Resistor termination networks |
| 38 | C.2 Verification of termination loads Table C.1 — Requirements for terminations at calibration plane |
| 39 | Bibliography |
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