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BS EN 50289-1-11:2016 Communication cables. Specifications for test methods - Electrical test methods. Characteristic impedance, input impedance, return loss >
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BS EN 50289-1-11:2016 Communication cables. Specifications for test methods - Electrical test methods. Characteristic impedance, input impedance, return loss, 2017
- Contents Page
- European foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- Figure 1 — Return loss with and without junction reflections
- Figure 2 — Return loss and open/short return loss
- Figure 3 — Return loss, open short return loss and structural return loss
- 4 Test method for mean characteristic impedance (S21 type measurement) [Go to Page]
- 5 Test method for input impedance and return loss (S11 type measurement) [Go to Page]
- Figure 4 — T-resistor network [Go to Page]
- Figure 5 — Calibration set-up [Go to Page]
- 6 Test report
- Annex A (normative) Function fitting of input impedance
- A.1 General
- A.2 Polynomial function for function fitting of input impedance
- A.3 Fewer terms
- 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)
- Figure B.2 — Equivalent circuit for the corrective calculation
- B.3 Gated return loss (GRL)
- Figure B.3 — Return loss with gating correction
- B.4 Fitted return loss (FRL)
- Figure B.4 — Return loss and input impedance before any correction
- 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
- 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
- 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
- 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
- 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
- Annex C (normative) Termination loads for termination of conductor pairs
- C.1 General
- Figure C.1 — Resistor termination networks
- C.2 Verification of termination loads
- Table C.1 — Requirements for terminations at calibration plane
- Bibliography [Go to Page]
