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.<\/p>\n
It is to be read in conjunction with EN 50289-1-1, which contains essential provisions for its application.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | Contents Page <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | European foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Figure 1 \u2014 Return loss with and without junction reflections Figure 2 \u2014 Return loss and open\/short return loss <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Figure 3 \u2014 Return loss, open short return loss and structural return loss <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 4 \u2014 T-resistor network 5.1.2 Test sample 5.1.3 Calibration procedure <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figure 5 \u2014 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 <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2.2 Test sample 5.2.3 Calibration procedure 5.2.4 Measuring procedure <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.3 Method C: measurement of coaxial cables 5.3.1 Test Equipment 5.3.2 Test sample 5.3.3 Calibration procedure <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.3.4 Measuring procedure 5.4 Expression of test results <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6 Test report <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Annex A (normative) Function fitting of input impedance A.1 General A.2 Polynomial function for function fitting of input impedance <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | A.3 Fewer terms <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Annex B (normative) Correction procedures for the measurement results of return loss and input impedance B.1 General Figure B.1 \u2014 Input impedance (magnitude) and operational return loss up to 2 GHz B.2 Parasitic inductance corrected return loss (PRL) <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure B.2 \u2014 Equivalent circuit for the corrective calculation <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | B.3 Gated return loss (GRL) <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Figure B.3 \u2014 Return loss with gating correction B.4 Fitted return loss (FRL) <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure B.4 \u2014 Return loss and input impedance before any correction <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure B.5 \u2014 Return loss and input impedance (with fitting) after fixture correction Figure B.6 \u2014 Residual impedance (after fixture correction) and its fitting Figure B.7 \u2014 Return loss and input impedance after complete correction <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure B.8 \u2014 Return loss, with fixture correction vs. without fixture correction Figure B.9 \u2014 Input impedance (real and imaginary part), with fixture correction vs. without fixture correction <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | B.5 Comparison of gated return loss (GRL) with fitted return loss (FRL) Figure B.10 \u2014 Return loss, fitting vs. gating correction Figure B.11 \u2014 Real part of input impedance, fitting vs. gating correction <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure B.12 \u2014 Imaginary part of input impedance, fitting vs. gating correction B.6 Influence of the correction technique on return loss peaks Figure B.13 \u2014 Reflection coefficient of a Cat.6 data cable in polar coordinates without and with PRL-correction <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Figure B.14 \u2014 Return loss traces corresponding to Figure B.13 Figure B.15 \u2014 Reflection coefficient of a Cat.6 data cable in polar coordinates without and with PRL-correction Figure B.16 \u2014 Return loss traces corresponding to Figure B.15 <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex C (normative) Termination loads for termination of conductor pairs C.1 General Figure C.1 \u2014 Resistor termination networks <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | C.2 Verification of termination loads Table C.1 \u2014 Requirements for terminations at calibration plane <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Communication cables. Specifications for test methods – Electrical test methods. Characteristic impedance, input impedance, return loss<\/b><\/p>\n |