1、4 Edition approved for publication 1992-06-05 CEN PREN*ZSL (PART*C3) 72 3404589 002b4b 7 Comments should be sent within six months after the date of publication decision A.E.C.M.A. Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cdex - FRANCE A.E.C.M.A. STANDARD NORME A.E.C.M
2、.A. A.E.C.M.A. NORM prEN 2591 Part C3 Issue P 1 June 1992 DIT PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATRIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex - TI. (1) 47.36.98.76 UDC Key words : ENGLISH VERSION Aerospace series Elements of electr
3、ical and optical connection Test methods Part C3 - Cold/low pressure and damp heat Srie arospatiale Luft- und Raumfahrt Organes de connexion lectrique et optique Mthodes dessais Prufverfa hren Partie C3 - Froid/basce pression et chaleur humide Elektrische und optische Verbindungselemente Teil C3 - K
4、lte, niedriger Luftdruck und feuchte Wrme This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de MatrielArospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the expe
5、rts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After .ex
6、amination and signature of the AECMA Standard Checking Centre (NPS) and formal 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. Nota - Extra copies can be supplied by B.N.A.E. -
7、 Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C2 Chairman M. J. LE CUNFF aecma 1992 CEN PREN*25L (PART*C3) 92 m 3404589 002bq7 9 m prEN 2591 -C3 Page 3 O Foreword Ionisation phenomena can cause short-circuits in insulating material (by tracking) between points br
8、ought to different potential levels. The diffusion of metal ions in inserts is one of the most dangerous occurrences. It is therefore indispensable to apply a direct current voltage of sufficient level throughout the test. In addition, limit layer effects on the surface of inserts may also give rise
9、 to severe functional incidents (such as generation of spurious voltages). Such effects can only be evidenced by a prolonged exposure to a saturated damp atmosphere with application of a direct current voltage (superficial leakage). 1 Scope and field of application This standard specifies a method o
10、f verifying the long-term stability of an element of connection design when exposed to ionisation phenomena. It shall be used in conjunction with EN 2591. 2 References EN 2591 Aerospace series - Elements of electrical and optical connection - Test methods - General EN 259 1 -B6 Aerospace series - El
11、ements of electrical and optical connection - Test methods - Part B6 - Measurement of insulation resistance 1) 3 Preparation of specimens 3.1 The specimens shall be fitted with their standard accessories, mounted and wired as specified by the technical specification. If, exceptionally, the rear face
12、 of the specimens shall be protected, (e.g. rear face of an hermetic connector) the protective device shall meet the requirements of the technical specification. The test shall be performed on mated or unmated elements of connection with protective cover. 1) In preparation at the date of publication
13、 of the present standard. ,- . Previous page is blank CEN PREN*259L (PART*C3) 92 m 3404589 O026948 O = prEN 2591-C3 Page 4 Cavities with unwired contacts shall be fitted with filler plugs such as defined by the technical specification. Elements of connection shall be wired so as to meet the requirem
14、ents of the measurement method defined by the technical specification for test EN 2591 -B6. 3.2 Unless indicated in the technical specification, the following details shall be specified : - type of wire, - initial measurements and requirements, - number of cyles, - insulation resistance, - minimum t
15、emperature. 4 Method 4.1 Climatic preconditioning The specimens shall be preconditioned in an oven whose temperature shall be raised to 70 OC within 2 h and this temperature. shall be maintained for 20 h to remove any trace of moisture. The oven temperature shall then be reduced to 40 OC within 2 h.
16、 4.2 Initial measurements (if applicable) They shall be performed as specified by the technical specification while the specimen is in the chamber and in the position defined by the technical specification. 4.3 Procedure Method A : single chamber (see figure 1) Method B : two chambers (see figure 2)
17、 4.3.1 Method A After preconditioning ambient conditions shall be restored (23 the second chamber shall be used for damp heat. The specimens shall be transferred from the Ist to the 2nd chamber only when ambient conditions are reached in the cycle. I CENoPREN*259L (PART*C3) 92 3404589 002b950 9 -20
18、-40 prEN 2591-C3 Page 6 The transfer shall take place in less than one hour (see figure 2). This shall constitute one cycle. The nuinber of cycles shall be as indicated in the technical specification. A Preconditioning Modification of climatic conditions, 1 st cycle L 2nd cycle K - 80 70 60 Specimen
19、 transfer 40 20 O Minimum temperature for climatic category 1 st chamber I_ 3 Figure 2 4.3.3 Measurements d ur ng condition ng I i 1 lelative humidity 95 %I I i n I 1 I I !O 40 44 L 2nd chamber 3 Throughout the test, a 300 V d.c. potential shall be applied between the two groups of contacts and an electrical leakage monitoring system shall be provided. Leakage shall not exceed 2 mA between the two groups of contacts. / I During the last hour and before the end of the last cycle, the insulatian resistance shall be measured (EN 2591-B6).
