1、BSI Standards PublicationCoaxial communication cablesPart 1-116: Electrical test methods Test for impedance with time domain reflectometry (TDR)BS IEC 61196-1-116:2015National forewordThis British Standard is the UK implementation of IEC 61196-1-116:2015.The UK participation in its preparation was e
2、ntrusted to TechnicalCommittee EPL/46, Cables, wires and waveguides, radio frequency connectors and accessories for communication and signalling.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the neces
3、sary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 84488 1ICS 33.120.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was
4、published under the authority of theStandards Policy and Strategy Committee on 31 December 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS IEC 61196-1-116:2015IEC 61196-1-116 Edition 1.0 2015-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Coaxial communication
5、 cables Part 1-116: Electrical test methods Test for impedance with time domain reflectometry (TDR) Cbles coaxiaux de communication Partie 1-116: Mthodes dessais lectriques Essai dimpdance par rflectomtrie dans le domaine temporel (TDR) INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTEC
6、HNIQUE INTERNATIONALE ICS 33.120.10 ISBN 978-2-8322-3010-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vou
7、s assurer que vous avez obtenu cette publication via un distributeur agr. BS IEC 61196-1-116:2015 2 IEC 61196-1-116:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 Principles 5 5 Test method 6 5.1 Equipment 6 5.2 Test sample 7 5.3 Procedure . 7 5.4
8、Calculation of test data . 9 5.4.1 Test instrument deviation calculation . 9 5.4.2 Correction calculation 9 6 Test report . 9 7 Requirement 9 Figure 1 Principle of TDR measurement . 6 Figure 2 Test sample . 7 Figure 3 Zairtest set-up . 8 Figure 4 Test set-up with test sample . 8 BS IEC 61196-1-116:2
9、015IEC 61196-1-116:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ COAXIAL COMMUNICATION CABLES Part 1-116: Electrical test methods Test for impedance with time domain reflectometry (TDR) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for stan
10、dardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes In
11、ternational Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may particip
12、ate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement betwee
13、n the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications
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15、misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding n
16、ational or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any servic
17、es carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC Natio
18、nal Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is
19、 drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall
20、 not be held responsible for identifying any or all such patent rights. The International Standard IEC 61196-1-116 has been prepared by subcommittee 46A: Coaxial cables, of IEC technical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories.
21、The text of this standard is based on the following documents: FDIS Report on voting 46A/1270/FDIS 46A/1283/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the
22、 ISO/IEC Directives, Part 2. BS IEC 61196-1-116:2015 4 IEC 61196-1-116:2015 IEC 2015 This standard is intended to be read in conjunction with IEC 61196-1. It is based on the second edition (2005) of that standard. A list of all parts of the IEC 61196 series, published under the general title: Coaxia
23、l communication cables, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the public
24、ation will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS IEC 61196-1-116:2015IEC 61196-1-116:2015 IEC 2015 5 COAXIAL COMMUNICATION CABLES Part 1-116: Electrical test methods Test for impedance with time domain reflectometry (TDR) 1 Scope This part of IEC 61196 applies to c
25、oaxial communications cables. It specifies test methods for determining the impedance of coaxial communications cables with time domain reflectometry (TDR). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its
26、application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61196-1:2005, Coaxial communication cables Part 1: Generic specification General, definitions and requirements IEC 62153-1-
27、1, Metallic 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) 3 Terms and definitions For the purpose of this document, the terms and definitions given in IEC 61196-1 apply
28、. 4 Principles When a step function signal is sent to cable under test and the signal pass through the test point of cable, part of the energy is reflected. The distance (L) from the input end to the test point can be calculated by measuring the total signal traveling time (t) as Figure 1. The chang
29、e of impedance can be also calculated by measuring the amplitude of the input and reflected signal, as shown in Figure 1. BS IEC 61196-1-116:2015 6 IEC 61196-1-116:2015 IEC 2015 Figure 1 Principle of TDR measurement The distance L of the test point can be determined by: r22=tctvL (1) The impedance o
30、f the test point should be: inreUU=r (2) rr+=110iLZZ (3) where L is the distance of the test point, in metres (m); v is the propagation velocity, in metres per second (m/s); t is the total signal traveling time as shown in Figure 1, in seconds (s); c is the propagation velocity in free space (3 108m
31、/s); ris the dielectric constant of cable dielectric; is reflection coefficient; Ureis the voltage of reflected signal, in volts (V); Uinis the voltage of input signal, in volts (V); ZLis the impedance of the test point, in ohms (); Zi0is the impedance of the reference line, in ohms (). 5 Test metho
32、d 5.1 Equipment Test instrument: A time domain reflectometer (TDR) using a step voltage with enough resolution and accuracy and rise time less than 100 ps, or a vector network analyzer (VNA) with time domain capability using a step function in accordance with IEC 62153-1-1. Test point IEC Input sign
33、al Reflected signal Transmission signal ZLZi0L t BS IEC 61196-1-116:2015IEC 61196-1-116:2015 IEC 2015 7 Reference components: A precision air-line and a precision load with the same nominal impedance as the cable under test. 5.2 Test sample The cable under test (CUT) shall be terminated with suitabl
34、e connectors at each end, as shown in Figure 2. Maximum Lsampleshall be determined: 3 m or 2 dB at 3 GHz whichever is shorter. Minimum Lsampleis mainly dependent on the resolution of TDR system rise time, which shall be determined by: rsystemsample2ctL (4) where Lsampleis the length of test sample s
35、hown in Figure 2, in metres (m); tsystemis the rise time of TDR system, in seconds (s); c is the propagation velocity in free space (3 108m/s); rs the dielectric constant of cable dielectric. Figure 2 Test sample For higher precision, a pair of screw thread connectors suitable to interface of the TD
36、R or VNA should be used. 5.3 Procedure The procedure is as follows. a) After fully preheating test instrument, set the test mode to measure impedance of the test sample. b) The precision air-line shall be connected between the test instrument and the precision load, as shown in Figure 3. Set the tes
37、t range of test instrument to regular impedance range of the precision air line, and record the average impedance Zair. Connector Connector LsampleIEC BS IEC 61196-1-116:2015 8 IEC 61196-1-116:2015 IEC 2015 Key 1 test lead 2 precision air line 3 precision load Figure 3 Zairtest set-up For higher pre
38、cision, test lead shall be as short as possible. c) Insert the test sample between the precision air-line and the precision load, as shown in Figure 4. Set test range of test instrument to measure within the confines of “Lsample” as shown in Figure 2. Then measure the impedance, “Zsample”, and recor
39、d the relevant data of impedance. Key 1 test lead 2 precision air line 3 test sample 4 precision load Figure 4 Test set-up with test sample IEC 1 2 3 4 IEC 1 2 3 BS IEC 61196-1-116:2015IEC 61196-1-116:2015 IEC 2015 9 d) The test sample shall then be turned end-to-end and the measurement repeated as
40、5.3 c). 5.4 Calculation of test data 5.4.1 Test instrument deviation calculation The impedance deviation of test instrument is given by: air0ZZ = (5) where is the impedance deviation of test instrument , in ohms (); Z0is the nominal impedance of precision air line, in ohms (); Zairis the measured av
41、erage impedance of precision air line, in ohms (). 5.4.2 Correction calculation The impedance of the test sample is given by: +=sampleZZ (6) where Z is the impedance of the test sample, in ohms (); Zsampleis the actual measured impedance of the test sample, in ohms (); is the impedance deviation of
42、test instrument , in ohms (). 6 Test report The test report shall include: the test sample length Lsample , in metres (m); ambient temperature, in degree Celsius (C); parameters set in the VNA (when applicable); the tolerance of the precision load and air line; the impedance of the test sample, in o
43、hms (). 7 Requirement The results at both ends of the test sample shall not exceed the value specified in the detailed specification. _ BS IEC 61196-1-116:2015This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and ot
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