1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-201:1996 Elements of electricaland opticalconnection Test methods Part 201: Contact resistance Low level The European Standard EN 2591-201:1996 has the status of a British Standard ICS 49.060BSEN2591-201:1996 This British Standard, having been prepared un
2、der the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comesintoeffect on 15June1996 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 91/74941 DC ISBN 0 580 25951 X Committe
3、es 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 British Rubber
4、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 CommentsBSEN2591-201:1996 BSI 10-1999 i Contents Page Committees responsible
5、 Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Preparation of the specimens 3 4 Apparatus 3 5 Method 4 Figure 1 3 Figure 2 4 Table 1 4 List of references Inside back coverBSEN2591-201:1996 ii BSI 10-1999 National foreword This British Standard has been prepa
6、red by Technical Committee ACE/6 and is the English language version of EN2591-201:1996 Aerospace series Elements of electrical and optical connection Test methods Part 201: Contact resistance Low level, published by the European Committee for Standardization (CEN). It supersedes BS EN2591-B1:1992,
7、which is withdrawn. EN 2591-201:1996 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 their correct applicat
8、ion. 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 terms Part 1 Terms
9、common to power, telecommunications and electronics 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, pagesi andii, theEN title page, pages1
10、 to4, an inside back cover and a back cover. 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 2591-201 February1996 ICS49.060 Supe
11、rsedesEN2591-B1:1992 Descriptors: Aerospace industry, aircraft equipment, elements of electrical and optical connection, test English version Aerospace series Elements of electrical and optical connection Test methods Part 201: Contact resistance Low level Srie arospatiale Organes de connexion lectr
12、ique et optique Mthodes dessais Partie 201: Rsistance de contact sous faible intensit Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil 201: Kontaktwiderstand im Schwachstrombereich This European Standard was approved by CEN on1992-10-19. CEN members are bound to com
13、ply 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 Central Se
14、cretariat 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 as the of
15、ficial 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 UnitedKingdom. CEN European Committee for Standardization Comit Europen de
16、 Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN2591-201:1996 EEN2591-201:1996 BSI 10-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacture
17、rs (AECMA). The alphanumerical designation of the Parts of EN2591 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 EN2591-B1 after application of this decision, without an
18、y 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 August1996, and conflicting national standards shall be withdrawn at the latest by August1996. Ac
19、cording 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, Portugal, Spain, Swed
20、en, Switzerland and UnitedKingdom.EN2591-201:1996 BSI 10-1999 3 1 Scope This standard specifies a method for measuring the low level electrical resistance across a pair of mated contacts and their terminations. It shall be used together with EN2591. 2 Normative references This European Standard inco
21、rporates 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 publications apply to this Euro
22、pean 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 series Elements of electric
23、al and optical connection Test methods General. 3 Preparation of the specimens 3.1 They shall be fitted with their wired contacts and mated. The contacts concerned shall not have been subjected to any prior fatigue tests or heating at rated current. 3.2 Unless indicated in the technical specificatio
24、n or EN2591, the following details shall be specified: measuring points; type of cable; test temperature; permissible limits of contact resistance. 4 Apparatus The measuring instruments shall be of accuracy class1,5 for current and0,5 for voltage seeIEC50(302). A schematic diagram of the test appara
25、tus is shown inFigure 1: Figure 1 I = Test direct current M 1 = d.c.ammeter (optional) for adjusting current to1 A when the measuring circuit is open. R 1 = 0,020 W. resistor. The use of an ammeter shunt providing a20mV potential drop at terminals under1A is suggested. R 2 = 0,2 W min. resistor. Thi
26、s resistor may be used for limiting and measuring current. It may be replaced by a d.c.centre zero,100mA full scale,1% precision milliammeter. If this apparatus has a shunt resistance below0,2 W, add an additional resistor to reach a total of min.0,2W. S 1 = Reversing switch, central position, open.
27、EN2591-201:1996 4 BSI 10-1999 To prevent rupturing of the insulting films on the contacts, the measuring circuit e.m.f. in open circuit, shall not exceed20mV d.c The test current shall not exceed10mA d.c 5 Method 5.1 Measurements shall be carried out with d.c.current in both directions. 5.2 Number o
28、f contacts to be measured per size SeeTable 1 Table 1 5.3 Procedure The contact resistance shall be measured as shown inFigure 2. The specimen shall not be unmated while the measuring voltage is applied. During the measurements, care shall be taken to avoid movement of the test cables in order to el
29、iminate stresses on the contacts. The resistance of the cable or wire used shall be subtracted from the measured value. The corrected value shall be recorded. The measurement shall be made three times in each direction of current. The value retained is the average of the three cycles (i.e.six measur
30、ements). 5.4 Requirement The mean value and the value of each measurement shall not exceed the specified value. Number of contacts of the same size in an element of connection: N Minimumpercentagetobemeasured: % N k 5 100 5 130 10 a a The result shall be, if necessary, raised to the next full number
31、. Figure 2 BSEN2591-201:1996 BSI 10-1999 List of references See national foreword.BS EN 2591-201:1996 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europ
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