1、, Edition approved for publication 1992-06-05 CEN PREN*2571i (PART*C4) 92 = 3404587 0026953 O Comments should be sent within six months C2 Chairman A.E.C.M.A. M. J. LE CUNFF after the date of publication decision Technopolis - 175, rue Jean-Jacques Rousseau 92138 Issy-les-Moulineaux Cdex - FRANCE A.
2、E.C.M.A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 2591 Part C4 Issue P 1 June 1992 DITE PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex - Tl. (1) 47.36.98.76 UDC : Key words : ENGLISH VERSION Aer
3、ospace series Elements of electrical and optical connection Test methods Part C4 - Damp heat steady state Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverfahren Organes d - connexion lectrique et optique Partie C4 - Essai continu de chaleur humide Elektrische und optische Verbindungsa.ame
4、nte Teil C4 - Dauerprfung bei feuchter Wrme This Aerospace Series, pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the
5、experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of thispre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. c Afte
6、r examination and signature of the AECMA Standard Checking Centre (NPS) and format agreement of the Official Services of the Member countries it willbe submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote. El aecma 1992 1 This standard specifies a met
7、hod of assessing the ability of an element of connection to be stored and to function under conditions of high relative humidity. Scope and field of application t- It shall be used together with EN 2591. 2 References EN 2591 Aerospace series - Elements of electrical and optical connection - Test met
8、hods - General EN 2591-Al Aerospace series - Elements of electrical and optical connection - Test methods - Part Al - Visual examination 1) EN 259 1 -B 1 Aerospace series - Elements of electrical and optical connection - Test methods - Part B1 - Contact resistance - Low level EN 259 1 -B2 Aerospace
9、series - Elements of electrical and optical connection - Test methods - Part 82 - Contact resistance at rated current 1) EN 259 1 -B6 Aerospace series - Elements of electrical and optical connection - Test methods - Part B6 - Measurement of insulation resistance 1) EN 259 1 -B7 Aerospace series - El
10、ements of electrical and optical connection - Test methods - Part 87 - Voltage proof test 1) EN 259 1 -D8 Aerospace series - Elements of electrical and optical connection - Test methods - Part D8 - Mating and unmating forces 2) 3 Preparation of specimens 3.1 The specimens shall be fitted with their
11、normal accessories, mounted and wired according to the technical specification. The technical specification shall specify whether elements of connection are mated or unmated and if required, specify the number of times they shall be mated or unmated prior to the test. 1) in preparation at the date o
12、f publication of the present standard. 2) Published as AECMA pre-standard at the date of publication of the present standard. Previous page is blank CEN PREN*2591 (PART*C4) 92 = 3404589 0026953 4 = prEN 2591-C4 Page 4 3.2 Unless indicated in the technical specification, the following details shall b
13、e specified : 4 mated or unmated elements of connection, specimen mounting method and wiring definition, number of mating and unmating operations, if applicable, type of preconditioning, degree of severity (duration of conditioning in days), value of direct polarisation voltage, initial measurements
14、, measurements during conditioning, if applicable, methods for final measurements. Apparatus 4.1 The test chamber shall be so constructed that : - the temperature and humidity of the chamber are controlled by sensing devices located at those points where the specimens are installed, - t,hf temperatu
15、re may be maintained at (40 f 2) OC, and the relative humidity at (93,) % at those points where the specimens are installed. The temperature tolerance of f 2 OC is intended to take into account absolute errors in the measurements, slow changes of temperature and temperature variations at those point
16、s where the specimens are installed. - condensed water is continuously drained from the chamber and not used again until it has been repurified. When the humidity conditions are obtained by using an injection-type chamber, the water shall have resistivity greater than 500 0.m. 4.2 Precautions shall
17、be taken to ensure that : - the conditions prevailing throughout the locations where the specimens are installed are uniform and as similar as possible to those prevailing in the immediate vicinity of the monitoring devices, - the properties or loading of specimens under test do not appreciably infl
18、uence conditions within the chamber, - no condensed water from the chamber walls and roof can fall on the specimens. CEN PREN*2591 (PART*C4) 92 W 3404589 0026954 b II 5 Method 5.1 Climatic preconditioning It shall not be less than one hour unless otherwise specified in the technical specification. 5
19、.2 Initial measurements (if applicable) They shall be carried out as specified by the technical specification. 5.3 Procedure 5.3.1 The specimens shall be introduced into the test chamber in the state indicated by the technical specification. When introducing specimens into the chamber, care shall be
20、 taken to avoid the formation of water droplets on the specimens ; this can be done by pre-heating the specimens to the temperature specified for the chamber. 5.3.2 The specimens shall be introduced into the chamber and subjected to the severity rgquired by the technical specification, among the fol
21、lowing : - twenty-one days, - fifty-six days. 5.4 3 Polarisation voltage A direct current polarisation voltage shall be applied to two of the specimens during conditioning. Alternate contacts shall be connected together to form two groups. On specimen No.1, the polarisation voltage shall be applied
22、across the first group of contacts and the second group connected to the housing (shell) and/or the mounting plate. On specimen No.2, the polarisation voltage shall be applied across the second group of contacts and the first group connected to the housing (shell) and/or ta the mounting plate. 5.4 R
23、ecovery Recovery shall be at least one hour, unless otherwise prescribed by the technical specification. 5.5 Final measurements and requirements (if applicable) The specimen shall be subjected to the following test sequence : - EN 2591-86 - Measurement of insulation resistance, - EN 2591-B7 - Voltag
24、e proof test, - EN 2591-BI or EN 259142 - Contact resistance at low level or at rated current, - Mating and unmating forces, -08 -A 1 - Visual examination. - EN259 - EN 259 prEN 2591-C4 Page 5 prEN 2591-C4 Page 6 After exposure, the specimen shall not be mated or unmated until the first measurement of contact resistance. The first two tests shall be carried out immediately after the final recovery period. When required by the technical specification, measurement following EN 259 1 -B6 shall be made while the specimen is still in the test chamber.
