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1、International Standard 8668/2 ,NTERNAT,ONAL ORGANlZATlON FOR STANDARDIZATION*MEWiflYHAPORHAR OPrAHH3AUR OCTAHAPTH3AUkl!4*ORGANlSATlON INTERNATIONALE DE NORMALISATION Aircraft - Terminal junction systems - Part 2 : Tests Ahronefs - Syst - between one contact of a group of one module and in succession
2、 any contact of the other adjacent groups of the module; - between all the contacts of the con- nected group or groups (one contact per group) of a module and the contacts (one con- tact per group) of connected groups of adja- cent modules. 3b Feed-through modules The measurement shall be carried ou
3、t on a single side; on the other side the conductors shall be insulated one from another. The points of application shall be the same as specified in 3a for feed-back modules. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/
4、9960866100 Not for Resale, 04/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6666/2-1666 (E) est No. Title of test Test procedure TeSt results required 4 Voltage Carry out the test on completely wired specimens. Apply progressively an alternating volta
5、ge, the final value of which, 1 500 V, r.m.s. value, shall be maintained for 60 k 5 s. The points of application of the voltage shall No breakdown or flashover shall occur during be those specified in 3a. application of the voltage. The leakage current shall not exceed 2 mA. 5 Contact This test shal
6、l be carried out in conformity with resistance the requirements of the annex. 5a Low voltage Carry out the test with d.c. or a.c. The contact resistance shall be not greater If the measurement is carried out with ac., the than the following values: frequency of the applied voltage shall not be more
7、than 1 500 Hz. The open circuit voltage shall be 20-2 mV and the current shall be ad- justed and maintained constant at 50 -ho mA. Carry out one measurement on each contact. 31 If the measurement is carried out in d.c., ensure, by inverting the polarity of the source, that the thermoelectric phenome
8、na do not interfere with measurement by more than 10 %. Then, take the mean value of the two measurements. 5b Rated current Adjust the current passing through the con- The contact resistance shall be not greater tact to the specified value of its rated current, than the following values: as stated i
9、n the detail specification. Contact Contact size resistance mQ 22 5 20 4 16 3 12 2 6 Thermal Carry out the test on completely wired shock specimens. The modules may either be mounted on a frame or fixed on an appropriate test support. Place the specimens for at least 30 min in a chamber where the te
10、mperature is maintained at the minimum stated temperature + 3 OC. After a period of 2 to 3 min in standard at- mospheric conditions, transfer the specimens to a chamber maintained at the maximum stated temperature + 2 OC and leave them there for at least 30 min. Carry out five cycles in these condit
11、ions. At There shall be no visible sign of mechanical the end of the fifth cycle leave the specimens deterioration. to return to normal conditions. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 0
12、4/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6666/2-1966 (E) Test No. Title of test 7 Contact extrac- tion force and mechanical endurance 8 Contact retention in the insulator I Test procedure Test results required I Carry out the test individually
13、on each contact or as specified in the detail specification. Extract the contact using the appropriate ex- traction tool. For this, introduce the tool until the system of unlocking operates, then, while keeping the axial alignment, apply a sufficient force to the crimped wire to extract the con- tac
14、t. Using the appropriate insertion tool, in- sert the contact until the locking system operates. These two operations make up one cycle. Carry out ten cycles on two contacts chosen from those which are the closest to each other on each module. Measure the extraction force during the first and final
15、cycles. Carry out the test individually on each contact. Introduce the contact using the appropriate in- sertion tool until the locking system operates. Having withdrawn the tool, check, by exerting a slight tensile force, that the contact is really locked. Apply to the crimped conductor an axial fo
16、rce of increasing intensity, the rate of variation of which shall be less than 5 N/s and apply the final load, which is given below, for 5 s. Contact size Final load applied N I Ibf The extraction force shall be not greater than the following values: Contact size Extraction force N 1 Ibf 22 23 1 5 T
17、he contact shall remain fixed in the module or splice. There shall be no deterioration of either insulator or the contact. During and after ap- plication of the force, the electrical continuity shall be checked. Fix the terminal junction system onto the plate of the shock generator using the usual d
18、evice. Carry out the test in conformity with the re- quirements of tests Ea specified in IEC Publica- tion 68-2-27. The impulse shall be half-sine wave, with an acceleration of 981 m/s2 (106g) and 6 ms in duration. Apply three shocks in succession in each of the three rectangular directions. One of
19、these directions shall be perpendicular to the plane of the front surface. The directions in which the shocks are carried out may be in any order. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04
20、/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/2-1986 (E) Test No. 1 Title of test Test procedure Test results required 9 Mechanical During the test, check the electrical continuity There shall be no interruption of electrical con- shock (conclud
21、ed) through the contacts connected in series (in tinuity longer than 1 ps. the case of modules with more than two con- tacts connected together, only two contacts shall be inserted in the test series circuit). The circuit thus constituted shall be supplied at 29 f 2,9 V in open circuit and with a cu
22、r- rent of 100 mA max. (d.c.1. 10 Vibration Fix the terminal junction system to the vibra- tion generator using the usual fixing device. Clamp the connection cables to non-vibrating points 306 mm from the modules. 1 I If specified in the detail specification, the specimens shall be submitted to the
23、test in the following temperature conditions: - at the ambient temperature for 50 % of the time; - at the maximum stated temperature for 25 % of the time; - at the minimum stated temperature for 25 % of the time. Carry out the test in conformity with the re- quirements of test Fc specified in IEC Pu
24、blica- tion 66-2-6, procedure 84. Frequency range: 10 to 2 OCQ Hz Amplitude: 0,75 mm or 96 m/s2 (log) above the transition frequency I I I Total duration of the test: 12 h 11 Climatic test lla Dry heat During the test, check the electrical continuity There shall be no interruption of electrical con-
25、 through the contacts connected in series (in tinuity longer than 1 us. the case of modules with more than two con- tacts connected together, only two contacts shall be inserted in the test series circuit). The circuit thus constituted shall be supplied at 29 k 2,9 V in open circuit and with a curre
26、nt of 100 mA max. (d.c.1. Submit the terminal junction systems to a series of climatic tests (as specified in Ila to lid). Expose the specimens for 16 h to the maxi- mum stated temperature, in the conditions laid down for test B specified in IEC Publication 68-2-2, then place them in the normal reco
27、very conditions for 4 h. 1 Ilb 1 Damp heat 1 Subject the specimens to a cycle of damp heat 1 I 1 (1st cycle) (accelerated test) in the conditions laid down for test Db specified in IEC Publication 66-2-30. 5 Copyright International Organization for Standardization Provided by IHS under license with
28、ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/2-1986 (El est No. Title of test Test procedure Test results required Ilc Cold Expose the specimens for 16 h to the minimum stated tempera
29、ture, in the conditions laid down for test A specified in IEC Publication 68-2-1, then place them in the normal recovery conditions for 4 h. Ild Damp heat Subject the specimens to five cycles of damp At the end of the series of climatic tests, the (2nd to 6th cycles) heat (accelerated test) in the c
30、onditions laid insulation resistance shall be not less than down for test Db specified in IEC Publication 500 MD. 68-2-30. 12 Endurance at maximum temperature Expose the specimens to the maximum stated temperature + 5 “C for a period of 1 000 h. At the end of this period of 1 000 h, and while The va
31、lues shall be not less than 100 Ma. the specimens are still at maximum temperature, measure the insulation resistance in accordance with test No. 3. 13 Damp heat, steady-state Examine the specimens visually. There shall be no visible material deterioration. Subject the specimens to a continuous damp
32、 heat test in the conditions laid down for test Ca specified in IEC Publication 68-2-3. 14 Immersion at low air pressure Severity: 21 days The marking shall remain legible. Unless otherwise specified, the free ends of the cables shall not be sealed. Separate the different ends of the cables as widel
33、y as poss- ible. Immerse the specimens in a container of water to which a quantity 5 % (mlm) of sodium chloride has been added in order to make the water conductive. Place the container in an appropriate test chamber with the free ends of the cable terminated inside the chamber, but not immersed. Re
34、duce the atmospheric pressure inside the chamber to 1 * 0,2 kPa1) and maintain it at this value for 30 + 5 min. Then return the chamber to normal atmospheric pressure. Repeat the above procedure twice. At the end of the third cycle, and while the The insulation resistance shall be not less than spec
35、imens are still submerged, subject them 100 MD. to an insulation resistance test (see test No. 3). 15 Ozone Place the modules in a test chamber contain- ing ozone with a concentration of between 0,010 and 0,015 % (Vl V) for a minimum period of 2 h at the ambient temperature. Then, examine the module
36、s visually to reveal There shall be no evidence of cracking of any signs of deterioration caused by ozone. material or other deterioration that will adversely affect the performances during subsequent tests. I I I 1) 1 Pa = 1 N/m* 6 Copyright International Organization for Standardization Provided b
37、y IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/2-1986 (E) est No. 16 17 18 Title of test Salt spray Zontact eesistance stability Resistance to fluids Test proce
38、dure iubmit the specimens to a salt spray test in onformity with the requirements of test Ka pecified in IEC Publication 66-2-l 1. est duration: 46 h he specimens shall be completely wired. ixamine the specimens visually. lace each wired module with its contacts in- erted normally with the wire entr
39、ance face lownwards in the first position a (see igure 1). Zany out the test on a bussed pair of wired :ontacts carrying rated current. Record the roltage drop continuously. Jnless otherwise stated in the detail specifica- ion, a test mass the value of which is given in he table below, is attached t
40、o one of the two vires. ly:ct / zz ( ky-;b ( rhen swing each module slowly through 90 :o positions b, c, dand e_ (see figure 1). Return :o position a after each position has been :ested in order to avoid rotation of the con- :acts about their axes. qepeat the test with the test mass attached to :he
41、second wire of the pair being tested. ? irst expose wired test specimens for at least !4 h to the following ambient conditions: - temperature: 15 to 35 OC; - humidity: 45 % to 75 %; - pressure: 86 to 106 kPa (860 to 1 060 mbar). The fluids to be used shall be specified in the detail specification. T
42、est results required Uo corrosion or deterioration sufficient to im- ,air use shall be noted. The variation in the resistance of each contact shall be not greater than the values below: 7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense
43、 Supply Ctr/9960866100 Not for Resale, 04/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9669/2-1996 (El rest No. Title of test Test procedure Test results required 18 Resistance Use different specimens for each fluid. The to fluids fluid shall be eith
44、er at the temperature (concluded) specified in the detail specification or at the maximum temperature intended for the specimens, whichever is the lesser. Submit the wired specimens to the following cycle : Submerge the specimens for the specified period. If the use of grease is specified, it is suf
45、ficient to smear it generously over all the exposed surfaces of the grommet face. 19 Flammability When the specimens have returned to normal There shall be no deterioration which will pre- conditions as stated above, remove and vent the specimens from passing subsequent replace two random contacts.
46、specified tests. If indicated in the detail specification, repeat the above sequence for a further four cycles. Under consideration. 8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 12:
47、13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/2-1686 (El Position b k + / L M - 11 Position d i % / M -;L c f Position e +F * M M I Position a -I * Towards the contact resistance measuring system Position c Figure 1 - Test positions for contact resistance s
48、tability 9 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 12:13:49 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8668/2-1986 (E) Annex Contact resistance - Measurement of voltage drop The conductors crimped to the male contacts shall be made of copper and with a cross-section equal to the maximum standardized cross-section for this contact. All the modules submitted to the test shall be completely wired. The measurement between