1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-202:1996 Elements of electrical and optical connection Test methods Part 202: Contact resistance at rated current The European Standard EN 2591-202:1996 has the status of a British Standard ICS 49.060BSEN2591-202:1996 This British Standard, having been pr
2、epared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 June 1996 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 92/84569 DC ISBN 0 580 2595
3、2 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/6, Aerospace avionic, electrical and fibre-optic technology, upon which the following bodies were represented: British Airways British Cable Makers Confederation Bri
4、tish Rubber Manufacturers Association Civil Aviation Authority (Airworthiness Division) Federation of the Electronics Industry Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBSEN2591-202:1996 BSI 11-1999 i Contents Page Committees
5、 responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of specimens 3 4 Apparatus 3 5 Method 4 Figure 1 3 Figure 2 4 Table 1 4 List of references Inside back coverBSEN2591-202:1996 ii BSI 11-1999 National foreword This British Standard has be
6、en prepared by Technical Committee ACE/6 and is the English language version of EN 2591-202:1996 Aerospace series Elements of electrical and optical connection Test methods Part 202: Contact resistance at rated current, published by the European Committee for Standardization (CEN). It supersedes BS
7、EN 2591-B2:1994 which is withdrawn. BS EN 2591-202:1996 was produced as a result of international discussions in which the United Kingdom took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for the
8、ir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard IEC (50) 302 BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour
9、terms Group 04:1986 Measurement terminology EN 2591 BS EN 2591:1992 Elements of electrical and optical connection. Test methods. General Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2to 6, an inside back cover and a back cover.
10、 This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-202 February 1996 ICS 49.060.00 Supersedes EN 2591-B2:1993 Descriptors: Air
11、craft industry, aircraft equipment, connecting equipment, tests, measurements, electrical resistance, contact resistance, rated current English version Aerospace series Elements of electrical and optical connection Test methods Part 202: Contact resistance at rated current Srie arospatiale Organes d
12、e connexion lectrique et optique Mthodes dessais Partie 202: Rsistance de contact au courant nominal Luft- und Raumfahrt- Elektrische und optische Verbindungselemente- Prfverfahren Teil 202: Kontaktwiderstand bei Nennstrom This European Standard was approved by CEN on 1993-12-16. CEN members are bou
13、nd 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-to-date lists and bibliographical references concerning such national standards may be obtained on application to the C
14、entral Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status
15、as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit
16、Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 2591-202:1996 EEN2591-202:1996 2 BSI 11-1999 Foreword This European Standard has been prepared by the European Association of Aerospace
17、Manufacturers (AECMA). The alphanumerical designation of the Parts of EN 2591 has been abandoned for a numerical designation in line with the Internal Regulations of CEN/CENELEC. This European Standard is the integral reproduction of the European Standard EN 2591-B2 after application of this decisio
18、n, without any other modification than the change in numbering. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 1996, and conflicting national standards shall be withdrawn at the latest by
19、August 1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portug
20、al, Spain, Sweden, Switzerland and United Kingdom.EN2591-202:1996 BSI 11-1999 3 1 Scope This standard specifies a method for measuring the electrical resistance at rated current across a pair of mated contacts and their terminations. It shall be used together with EN 2591. 2 Normative references Thi
21、s European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publica
22、tions apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IEC 50(302), International electrotechnical vocabulary Chapter 302: Electrical measuring instruments. EN 2591, Aerospace seri
23、es Elements of electrical and optical connection Test methods General. 3 Preparation of specimens 3.1 They shall be fitted with their wired contacts and mated. Unless otherwise specified by the product standard, the contacts shall not be cleaned. 3.2 Unless indicated in the technical specification,
24、the following details shall be specified: measuring points; type of cable; test temperature; current intensity; permissible limits of contact resistance. 4 Apparatus The measuring instruments shall be of accuracy class 1,5 for current and 0,5 for voltage see IEC 50(302). A schematic diagram of the t
25、est apparatus is shown in Figure 1. Figure 1 EN2591-202:1996 4 BSI 11-1999 5 Method 5.1 Number of contacts to be measured per size See Table 1. Table 1 5.2 Procedure Measurements shall be carried out with direct or alternating current. For a.c. measurements, the frequency shall not exceed 2 kHz. In
26、the case of dispute, the d.c. measurements shall take precedence. The source no-load voltage (d.c. or a.c. r.m.s. value) shall be at least 2,5 V and shall not exceed 60 V. When measurement connection points are not directly accessible, the resistance of the cable or wire used shall be subtracted fro
27、m the measured value. The corrected value shall be recorded. In such a case, the voltage drop across the conductors shall be measured as close as possible to the contacts (see Figure 2) with the same test devices and with the conductors used for wiring. To avoid overheating of contacts, the voltage
28、drop shall be measured within 5 s. During the measurement period, the connector shall not be unmated while the measuring voltage is applied. During measurements, care shall be taken to avoid exerting abnormal pressure on the contacts under test and to avoid movement of the test cables. 5.2.1 Measure
29、ment with direct current Measuring cycle: application of the voltage; measurement with current flowing in one direction; measurement with current flowing in the opposite direction; voltage source switched off. Number of contacts of the same size in an element of connection: N Minimum percentage to b
30、e measured: % N k 5 100 5 130 10 a a The result shall, if necessary, be rounded up to the next full number. Figure 2 EN2591-202:1996 BSI 11-1999 5 5.2.2 Measurement with alternating current Measuring cycle: application of the voltage; measurement; voltage source switched off. 5.3 Requirement The mea
31、sured value shall not be greater than that specified. For d.c. measurement, the arithmetical mean of the readings obtained in both directions of current shall be considered as the result of one measuring cycle.6 blankBSEN2591-202:1996 BSI 11-1999 List of references See national foreword.BS EN 2591-2
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