This part of IEC 62153 describes a method to extrapolate the test results of transfer impedance to higher frequencies and the test results of screening attenuation to lower frequencies when measured with the triaxial set-up according to IEC 62153-4-3 (method B) respectively IEC 62153-4-4. A similar approach to extrapolate the test results of transfer impedance to higher frequencies was already described in IEC 61196-1:1995 Subclause 12.2. This method is applicable for homogenous screens, i.e. screens having a transfer impedance directly proportional to length. The transfer impedance may have any frequency behaviour, i.e. it could have a behaviour where it does not increase with 20 dB per decade as observed for screens made of a foil and a braid.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Acronyms <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 4 Overview Figures Figure 1 \u2013 Simulation of the scattering parameter S21 (left hand scale) and the transfer impedance (right hand scale) for a single braid screen <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 5 Frequency behaviour of the triaxial set-up <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6 Extrapolation of measurement results Figure 2 \u2013 Magnitude of the frequency behaviour (F) in logarithmic frequency scale for a coupling length of 0,5\u00a0m, respectively 2\u00a0m and relative dielectric permittivity of 2,3 and 1,1 for the inner, respectively outer circuit Figure 3 \u2013 Magnitude of the frequency behaviour (F) in linear frequency scale for a coupling length of 0,5\u00a0m, respectively 2\u00a0m and relative dielectric permittivity of 2,3 and 1,1 for the inner, respectively outer circuit <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Figure 4 \u2013 Example for the extrapolation of the transfer impedance of a RG59 type cable measured with a coupling length of 2\u00a0m and assuming relative dielectric permittivity of 2,3 and 1,1 for the inner, respectively outer circuit <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 5 \u2013 Example for the extrapolation of the scattering parameter S21 in logarithmic frequency scale of a RG59 type cable measured with a coupling length of 0,5\u00a0m and assuming dielectric permittivities of 2,3 and 1,1 for the inner, respectively outer circuit <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 7 Determination of the relative dielectric permittivity and impedance 7.1 General Figure 6 \u2013 Example for the extrapolation of the scattering parameter S21 in linear frequency scale of a RG59 type cable measured with a coupling length of 0,5\u00a0m and assuming dielectric permittivities of 2,3 and 1,1 for the inner, respectively outer circuit <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Figure 7 \u2013 Measurement of S11 of the outer circuit (tube) having a length of 50\u00a0cm <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 7.2 Influence of the test head Figure 8 \u2013 Example of test head (COMET set-up) <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 9 \u2013 Example on how to obtain the electrical length of the test head from the S11 measurement using a bare copper wire as DUT (COMET set-up) <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 10 \u2013 Example for an RG58 type cable in 2 m triaxial set-up (COMET) <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Metallic communication cable test methods – Electromagnetic compatibility (EMC). Extension of the frequency range to higher frequencies for transfer impedance and to lower frequencies for screening attenuation measurements using the triaxial set-up<\/b><\/p>\n |