The absorbing clamp method is suitable to determine the screening- or the coupling attenuation of metallic communication cables in the frequency range of 30 MHz to 2400 MHz, depending on the performance of the clamp. It is an alternative method to the the triaxial method of IEC 62153-4-4 or IEC 62153-4-9. Due to the undefined outer circuit of this absorbing clamp method, the test results obtained at different places and laboratories could vary by at least \u00b1 6dB.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4 Principles of the test method <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5 Equipment 5.1 General <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.2 Balun requirements Figures Figure 1 \u2013 Measurement of near end screening attenuation, principle <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Tables Table 1 \u2212 Balun performance characteristics (30 MHz to 1,0 GHz) Table 2 \u2212 Balun performance characteristics (30 MHz to 2,4 GHz) <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.3 TP connecting unit requirements Figure 2 \u2013 Measurement of near end coupling attenuation with balun Table 3 \u2013 TP-connecting unit performance characteristics(30 MHz to 2,4 GHz) <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.4 Test sample 5.4.1 Tested cable length 5.4.2 Preparation of test sample Figure 3 \u2013 Balunless measuring of near end couplingattenuation with multiport VNA <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 4 \u2013 Termination of a screened symmetrical cable Figure 5 \u2013 Preparation of test sample (symmetrical and multi conductor cables) <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6 Test set-up 6.1 Test set-up calibration 6.2 Composite loss of the test set-up 6.2.1 General <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6.2.2 Reflection loss of the absorbing clamp in the calibration set-up Figure 6 \u2013 Calibration set-up Figure 7 \u2013 Termination during calibration <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.3 Attenuation of the measuring set-up 6.4 Insertion loss of the absorbers <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6.5 Test set-up arrangement Figure 8 \u2013 Measurement of the insertion loss of an absorber <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure 9 \u2013 Example of screen connections forscreened twisted pair cable measurement <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure 10 \u2013 Test set-up for near end measurement of symmetrical cable Figure 11 \u2013 Measurement of surface wave at near end of sample, principle <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.5.1 Test set-up verification 6.6 Pulling force on cable Figure 12 \u2013 Measurement of surface wave at far end of sample, principle <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 7 Procedure 7.1 General Figure 13 \u2013 Shielding arrangements for a far end measurement <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 7.2 Screening attenuation of coaxial respectively quasi coaxial cables 7.2.1 Matched conditions <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 7.2.2 Unmatched conditions <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 7.3 Coupling attenuation of balanced cables 7.3.1 Coupling attenuation measurement with balun <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 7.3.2 Balunless coupling attenuation measurement \u2212 Set-up 7.3.3 Expression of test results 8 Test report <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 9 Requirement <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Annex A (normative)Determination of the impedance of the inner circuit A.1 Determination of impedance of inner circuit A.2 Impedance matching device if Z1 < 50 \u2126 <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | A.3 Impedance matching device if Z1 > 50 \u2126 Figure A.1 \u2013 Impedance matching for Z1 <50 \u2126 Figure A.2 \u2013 Impedance matching for Z1 >50 \u2126 <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex B (informative)Example of a self-made impedance matching adapter Figure B.1 \u2013 Attenuation and return loss <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Figure B.2 \u2013 Attenuation and return loss <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Annex C (informative)Evaluation of test results for the couplingattenuation of balanced cables C.1 Worst case C.2 Examples Figure C.1 \u2013 Example measurement of a foil screen symmetrical cable <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Figure C.2 \u2013 Example measurement of a well screened symmetrical cable Figure C.3 \u2013 Example measurement of a well screened coaxial cable <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure C.4 \u2013 Frequent measurement error of a symmetrical cable Figure C.5 \u2013 Frequent measurement error of a symmetrical cable <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Annex D (informative)Reflection loss of a junction Figure D.1 \u2013 Source with Ri and RL <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Annex E (informative)Mixed mode parameters E.1 Definition of mixed mode S-parameters Figure E.1 \u2013 Common two-port network Figure E.2 \u2013 Common four port network <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Figure E.3 \u2013 Physical and logical ports of VNA Figure E.4 \u2013 Nomenclature of mixed mode S-parameters <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Figure E.5 \u2013 Measurement configuration, single ended response Figure E.6 \u2013 Measurement configuration, differential mode response <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | E.2 Reference impedance of VNA <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Metallic communication cable test methods – Electromagnetic compatibility (EMC). Screening or coupling attenuation. Absorbing clamp method<\/b><\/p>\n |