1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 1-1: Electrical Measurement of the pulse/step return loss in the frequency domain using the In
2、verse Discrete Fourier Transformation (IDFT)The European Standard EN 62153-1-1:2004 has the status of a British StandardICS 33.100; 33.120.10 Metallic communication cables test methods BRITISH STANDARDBS EN 62153-1-1:2004 Incorporating Corrigendum No. 1BS EN 62153-1-1:2004This British Standard was p
3、ublished under the authority of the Standards Policy and Strategy Committee on 19 February 2004 BSI 20 January 2006ISBN 0 580 43398 6 aid enquirers to understand the text;request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to
4、 in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of
5、 a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover.The BSI copyrigh
6、t notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments16040 Corrigendum No. 120 January 2006 Addition of supersession details A list of organizations represented on this subcommittee can be obtained on present to the
7、responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard is the official English language ver
8、sion of EN 62153-1-1:2004, including Corrigendum January 2006. It is identical with IEC 62153-1-1:2003. It supersedes DD IEC/PAS 62260:2001 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wires, waveguides, R.F. connectors, R.F. and mic
9、rowave passive components and accessories, to Subcommittee EPL/46/1, Communication cables, which has the responsibility to: EUROPEAN STANDARD EN 62153-1-1 NORME EUROPENNE EUROPISCHE NORM January 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Elect
10、rotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62153-1-1:2004 E ICS 33.100; 33.120.10 English version Me
11、tallic communication cables test methods Part 1-1: Electrical Measurement of the pulse/step return loss in the frequency domain using the Inverse Discrete Fourier Transformation (IDFT) (IEC 62153-1-1:2003) Mthodes dessai des cbles mtalliques de communication Partie 1-1: Electrique Mesure de la perte
12、 par rflexions une impulsion/chelon dans le domaine frquentiel en utilisant la Transforme Inverse de Fourier Discrte (TIFD) (CEI 62153-1-1:2003) Prfverfahren fr metallische Kommunikationskabel Teil 1-1: Impuls-/Sprungreflexion aus der Messung im Frequenzbereich ber inverse diskrete Fouriertransforma
13、tion (IDFT) (IEC 62153-1-1:2003) This European Standard was approved by CENELEC on 2003-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-t
14、o-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation u
15、nder the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece
16、, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 62153-1-1:2004 - 2 - Foreword The text of document 46A/559/FDIS, future edition 1 of IEC 62153-1-1, prepared by SC 46
17、A, Coaxial cables, of IEC TC 46, Cables, wires, waveguides, r.f. connectors, r.f. and microwave passive components and accessories, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62153-1-1 on 2003-12-01. The following dates were fixed: latest date by which the EN ha
18、s to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-12-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the
19、 International Standard IEC 62153-1-1:2003 was approved by CENELEC as a European Standard without any modification. _ Page 2EN 6215311:200462153-1-1 IEC:2003 3 CONTENTSFOREWORD 2INTRODUCTION41 Scope 52 Normative references.53 Terms and definitions 54 Measurement principle.55 Performance calculations
20、.66 Procedure96.1 Coaxial cables96.1.1 Equipment 96.1.2 Preparation of test specimen 96.1.3 Calibration 96.1.4 Attenuation constant .106.2 Balanced cables .107 Expression of results .108 Requirement10iFugre 1 aLyout for rerutn-loss msaerumetne in hte frqeucney domain 91.261-35-11 EI:C0023 3 TNOCENTS
21、OFREWODR 5TNIRODTCUOIN .9.1 Scope .112 Nromative referecnse113 Trems dna definiitons 11.4 Measuremtne rpincilpe115 Preformcnac eaclultaiosn316 Procedure.91.61 Coaxial ca lse 91.6.11 Euqipmtne 919.6.12 Preparation fo test spcemine 91.6.13 Calibration 91.6.14 Attenuatino cosnatnt 12.11.62 Blaanced cab
22、lse 127 Expressiofo n results 128 Requrimenet.12iFugre 1 aLyout for rerutn-loss msaerumetne in hte frqeucney domain 91.Annex ZA (normative) Normative references to international publications with theircorresponding European publications . 1162153-1-1 IEC:2003 3 TNOCENTSFOREWORD 5TNIRODTCUOIN .9.1 Sc
23、ope .112 Nromative referecnse113 Trems dna definiitons 11.4 Measur mtne rpincilpe115 Prefor cnac eaclultaiosn316 Procedure.91.61 Coaxial cablse 91.6.11 Euqipmtne 91.6.12 Preparation fo test spcemine 91.6.13 Calibration 91.6.14 Attenuatino cosnatnt 12.62 Blaanced cablse 127 Expressiofo n results 128
24、Requrimenet .12Figure 1 Layout for return-loss measurement in the frequency domain .1962153-1-1 IEC:2003 3 CONTENTSFOREWORD 5INTRODUCTION 91 Scope .112 Normative references113 Terms and definitions .114 Measurement principle115 Performance calculations136 Procedure.196.1 Coaxial ca les .196.1.1 Equi
25、pment .196.1.2 Preparation of test specimen .196.1.3 Calibration .196.1.4 Attenuation constant 216.2 Balanced cables 217 Expression of results 218 Requirement .21Figure 1 Layout for return-loss measurement in the frequency domain .9nnAex ZA (nroma)evit roNmevita refercnese ot tniertannoial bupcilato
26、isn wit htriehcorresdnopiuE gnroepap nublicatsnoi . 15Page 3EN 6215311:200462153-1-1 IEC:2003 9 INTRODUCTIONThis part of IEC 62153 has been developed from IEC/PAS 622601. It is intended to be usedinitially for coaxial cables and to be developed in the future to include requirements for allmetallic c
27、ommunication cables.Irregularities in a transmission line, especially in r.f. cables, cause reflections that will lead toforward echoes. Such forward echoes may cause considerable signal transmissiondisturbance in analogue and digital systems. The magnitude of such irregularities of thecables need t
28、o be limited in cabling systems, for example, in CATV networks and thereforeneed to be determined.One method to determine such irregularities is to use analogue measuring techniques (TimeDomain Reflection (TDR), as described in 11.18 of IEC 61196-1. Although this is a well-known test method, instrum
29、entation with high sensitivity is no longer available on the market.With a modern vector network analyser, offering sufficient dynamic range, the pulse returnloss can be determined.This is achieved by measuring the return loss of the cable in the frequency domain asdescribed in 11.12 of IEC 61196-1
30、and transforming the results into the time domain by usingthe Inverse Discrete Fourier Transformation (IDFT). By integrating the pulse response dataover time, the step response can be calculated.The network analyser can be used for both the measurement of the return loss and thepulse/step return los
31、s without preparing the CUT twice. This method can therefore save timeand the cost of additional instrumentation and offers a simple and easy method for thedetection of signal transmission irregularities inside a cable.This method also offers higher accuracy and higher sensitivity than the analogue
32、TDRmethod._1IEC/PAS 62260:2001, Pulse/Step Return Loss from measurement in the frequency domain using the InverseDiscrete Fourier Transformation (IDFT).Page 4EN 6215311:200462153-1-1 IEC:2003 11 METALLIC COMMUNICATION CABLES TEST METHODS Part 1-1: Electrical Measurement of the pulse/step return loss
33、in the frequency domain using theInverse Discrete Fourier Transformation (IDFT)1 ScopeThis part of IEC 62153 describes the test which determines the regularity of impedance of r.f.cables by measuring the return loss in the frequency domain using a vector network analyserequipped with a reflection te
34、st set (bridge) and transferring the results into the time domain byusing the Inverse Discrete Fourier Transformation (IDFT).NOTE This is an additional optional test for the metallic communication cables described in IEC 61156-1 andIEC 61196-1.2 Normative referencesThe following referenced documents
35、 are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV)IEC 61156-1:2002
36、, Multicore and symmetrical pair/quad cables for digital communications Part 1: Generic specificationIEC 61196-1:1995, Radio-frequency cables Part 1: Generic specification General,Definitions, requirements and test methodsAmendment 1(1999)3 Terms and definitionsFor the purposes of this document, the
37、 terms and definitions given in IEC 60050, as well asthose given in IEC 61156-1 and IEC 61196-1, apply.4 Measurement principleThe test determines the return loss of coaxial r.f. cables in the time domain by measuring thereturn loss in the frequency domain, and transforming the results into the time
38、domain byusing the IDFT.The pulse/step return loss is displayed against time to show the magnitude and the localdistribution of irregularities of the characteristic impedance of the cable under test. Dependingon the number of points of the network analyser, cable length up to and above 5 km may beme
39、asured.Page 5EN 6215311:200462153-1-1 IEC:2003 13 The network analyser measures the magnitude and phase of the CUTs return loss (S11) inthe frequency domain at discrete frequencies specified by the harmonic portions contained inan equivalent time-domain pulse of predetermined shape. After processing
40、 a complete sweepover these frequencies, the network analyser has collected the spectral representation of thecable pulse answer into memory. The pulse answer in time-domain representation can becalculated now by applying a mathematical algorithm called IDFT to the stored data. Because,from the math
41、ematical point of view, the pulse is the derivative of the step, the response to astep function can be computed easily by integrating the pulse response data over time.The DFT calculates the complex factors Hnof the sine and cosine waves contained in anarbitrary waveform. The IDFT synthesizes a comp
42、lex arbitrary waveform by calculating thesum of the sine and cosine functions multiplied by the complex Fourier transforms Hn. Thetransformation does not depend on any dimensional parameter such as a time scale orfrequency.Because the actual measurements are made in the frequency domain, the calibra
43、tion of thenetwork analyser has to be carried out in the frequency domain as well using a full one-portcalibration for reflection measurements.5 Performance calculationsThe performance of an r.f. cable depends on its mechanical homogeneity. Deviations in itsmechanical dimensions will cause reflectio
44、ns of the r.f. signal which is travelling throughthe cable. The complex reflection factor rrxof such a reflection is given byxxrxZZZZr+=00(1)whereZ0is the nominal impedance of the cable;Zxis the actual impedance of the cable on a given point x.The transformation of one single reflection to the cable
45、 input with attention to the attenuationand propagation is given bylerr=2ix(2)wherelis the distance of the single reflection from the input of the cable; is the propagation constant; j+=(3)where is the attenuation constant; is the phase constant.Page 6EN 6215311:200462153-1-1 IEC:2003 15 Using the v
46、elocity ratio vrof the CUT, the distance drxtowards the location of the fault can becalculated by2r0rxrxvctd= (4)wheretrxis the time between the stimulating pulse and detection of the pulse answer in s;c0is the propagation velocity in free space in m/s;vris the velocity ratio of the CUT.The maximum
47、resolution in the time axis depends on the shape and width of the stimulatingpulse as stated in 11.16.4 of IEC 61196-1. It is inversely proportional to the highest frequencyportion contained in the pulse.The pulse return loss apis defined aswinrxp)log(20 ara += en dB (5)whererrxis the reflection coe
48、fficient of an irregularity at a distance x from the cable end andmeasured at the input end of the cable;awinis the constant factor added for the correction of the different windowing functions. Forthe square window, this factor can be set to 0 dB.The width of the virtual impulse tpis inversely prop
49、ortional to the measurement span:startstopwinpffbt= in s (6)wherebwinis the constant factor representing the bandwidth correction of the windowing function.For the square window, this factor can be set to 1;fstartis the start frequency of the sweep in the frequency domain in Hz;fstopis the stop frequency of the sweep in the frequency domain in Hz. The stop frequencyhas to meet the requirement fs
