1、STD.BS1 BS EN 257L-30-ENGL 177 Lb24bb Ub7397 273 BRITISH STANDARD AEROSPACE SERIES Elements of electrical and optical connection - Test methods Part 309. Dry heat The European Standard EN 2591309 : 1997 has the status of a British Standard ICs 49.060 NO COPYING WITHOUT ES1 PERMISSION EXCEPT AS PERMI
2、TTED BY COPYRIGHT LAW BS EN 2591309 : 1998 STD*BSI BS EN 2591-309-ENGL A998 = Lb24bb9 Ob73980 T95 direction of the Engineering AmdNo. Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1998 BS EN 2591309 : 1998 Date Text affected National forew
3、ord This British Standard is the English language version of EN 2591309 : 1997. The UK participation in its preparation was entnstd by Technical Committee ACW6, Aerospace avionic, electrical and fibre optic technology, to Subcommittee ACW6/3, Aerospace connectors, which has the responsibility to: -
4、aid enquirem to understand the text; - present to the responsible internationaLEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interesls iIlfOX.lnd, - monitor related international and European developments and promulgate them in the UK. A list of org
5、anizations represented on this commit mounting method, type of cable and definition of wiring of specimen; type of preconditioning (if applicable); initial measurements (if applicable); severity (see 5.3); final measurements and requirements; measurement method according to EN 2591 -206 and insulati
6、on resistance value. 4 Apparatus The test chamber shall be designed so that the temperature is controlled by sensing devices located at those locations where the specimens are installed. The absolute humidity shall not exceed 20 g of water vapour per cubic metre of air (.e. approximately 50 % relati
7、ve humidity at 35 OC). When the test is carried out at a temperature lower than 35 OC, the relative humidity shall not exceed 50 %. 1) Published as AECMA Prestandard at the date of publication of this standard Page 4 EN 2591 -308: 1997 5 Method 5.1 Preconditioning Preconditioning shall take at least
8、 1 h unless otherwise specified. If required, the specimens shall be mated and unmated the specified number of times before testing, 5.2 Initial measurements (if applicable) They shall be carried out as specified. 5.3 Severity The severity, defined by the temperature and exposure time, shall be sele
9、cted from those listed below. 5.3.1 Temperature - (350f5) OC - (260*5) oc - (200I.2) OC - (i7512) OC - (155f2) OC - (125i2) OC - (85f2) OC 5.3.2 Exposure time 16h 5.4 Procedure When the test chamber is at the temperature corresponding to the specified severity, the specimens shall be introduced and
10、connected to the measuring instruments. Exposure time shall be calculated from the moment the chamber has reached thermal stability. I 5.5 Final measurements and requirements On completion of exposure time, while the specimens are still at the high temperature and within 1 h, the insulation resistan
11、ce shall be measured (EN 2591-206). Its value shall not be less than that specified. STD.BS1 BS EN 2571-39-ENGL 1778 I-Lb24bb7 Ob73985 577 BS EN 2591-309 : 1998 BSI 389 Chiswick High Road London w4 4AL %SI - British Standards Institution SI is the independent national body responsible for preparing
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