1、MIL - J - 2 19 9 4B (OS) 31 May 1978 Superseding 4 January 1967 PIIL-J-21994A(OS) MILITARY SPECIFICATION JUNCTION BOX MARK 43 MOD O This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Departm
2、ent of Defense. 1. SCOPE 1.1 Scope. This specification describes the requirements for the procuremenTF Junction Box Mark 43 Mod O, LD 291892. Box Mark 43 Mod O is of one type and of one class. The Junction 2. APPLICABLE Doms 2.1 Issues of documents. The following documents, of the issue in effect on
3、 the date of invitation for bids or request for proposal, form a part of this specification. STANDARDS Military MIL - STD - 12 9 Marking for Shipment and Storage MIL-STD-331 Fuze and Fuze Components, Environmental and Performance Test for MIL - STD- 4 54 Standard General Requirements for Electronic
4、Equipment DRAWINGS NAVAL SEA SYSTD4S C“D (Code Ident. 10001) LD 291892 Junction Box Mark 43 Mod O Beneficial comments (recommendations, additions, deletions), and any pertinent data which may be of use in improving this document, should be addressed to: Commanding Officer, Naval Ordnance Station, St
5、andardization Division (611), Indian Head, Md. Improvement Proposal (DI) Form 1426) appearing at the end of this document, or by letter. 20640, by using the self-addressed Standardization Document FSC 1350 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
6、,-,-MIL-J-21994B (OS) Ail drawings referenced herein are listed on LD 291892 unless otherwise designated, PUBLICATIONS NAVAL SEA SYSTEMS CObWW OD 10511 nmagnetic Testing Mark 115 Mod 4 E 5 th the Test -ut Copies of specification, standards, drawings, and publications required by contractors in conne
7、ction with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer). 2.2 Other publications. The following document forms a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on th
8、e date of invitation for bids or request for proposal shall apply. NATIONAL BUREAU OF STANDARDS PUBLICATION HANDBOOK H28 Screw-Thread Standards for Federal Services (Application for copies should be addressed to the Superintendent of Documents, Government Printing Office, Washington, DC 20402). 3. R
9、EQUIREMENTS 3.1 Description. The junction box shall be a rectangular metal box with a cover which contains five cable receptacles: and one 4-pin receptacles. - four 35-pin 3.2 First article sample. Unless otherwise specified in the contract or order see 6.2), a first article sample of six junction b
10、oxes shall be manufactured using the methods and procedures proposed for the production lot. The sample shall be packaged in accordance with section 5 herein and tested as specified in section 4 herein. the purpose of determining that, prior to starting production, the contractors production methods
11、 are capable of producing items that comply with this specification and the design and may be waived by the contracting officer if satisfactory production has been recently accomplished. The sample is for 3.3 General requirements. 3.3.1 Fabrication. The Junction Box Mark 43 Mod O shall be manufactur
12、ed in accordance with LD 291892, all documents listed therein and as specified herein. with section 4. Inspection and acceptance shall be in accordance 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-21994B (OS) 3.3.2 Interchangeability. Comp
13、onent parts of assembled units (unless otherwise specified on the applicable drawings) fabricated in accordance with applicable drawings shall be interchangeable and shall assemble with mating components of the unit without selection for fit or performance. 3.3.3 Threads. Unless otherwise specified,
14、 all threads shall be in accordance with the National Bureau of Standards Handbook H28. 3.3.4 Soldering. Soldering shall be in accordance with Requirement 5 of FIIL-STD-454. 3.4 Performance requirements and product characteristics. The junction box shall meet the following performance requirements a
15、nd product characteristics: 3.4.1 Electrical continuity. The resistance between all points of the electrical circuits connected by design shall not exceed 0.5 ohm when tested in accordance with 4.7.3. 3.4.2 Insulation resistance. The electrical resistance between each terminal of the junction box an
16、d every other terminal insulated from it by design, and between each terminal and the junction box case, shall be 50 megohms minimum when measured with an applied potential of 500 5 50 volts DC and tested in accordance with 4.7.4. 3.4.3 Static magnetic effect. The static magnetic effect of the Junct
17、ion Box Mark 43 Mod O shall not cause a total change in the flux density of the background magnetic field of more than 0.10 milligauss (peak to trough). 3.5 Environmental resistance. The Junction Box Mark 43 Mod O shall withstand the following hazards of its functioning environment: 3.5.1 Vibration.
18、 The Junction Box Mark 43 Mod O shall withstand the vibration test of 4.8.1 without physical damage and thereafter meet the requirements of 3.4.1 and 3.4.2. 3.5.2 Shock. The Junction Box Mark 43 Mod O shall withstand the shock tem4.8.2 without physical damage and thereat-ter meet the requirements of
19、 3.4.1 and 3.4.2. 3.5.3 Temperature. The Junction.Box Mark 43 Mod O shall withstand the temperatures given below during operation and storage. 3.5.3.1 Operating. The Junction Box Mark 43 Mod O shall meet the requirements of 3.4.1 and 3.4.2 when tested according to 4.8.3.1. 3.5.3.2 Storage. The Junct
20、ion Box Mark 43 Mod O, packaged and After being removed from the chamber, the packed as required by Section 5 shall be able to withstand the test of 4.8.3.2 without damage. junction box shall meet the requirements of 3.4.1 and 3.4.2. 3 Provided by IHSNot for ResaleNo reproduction or networking permi
21、tted without license from IHS-,-,-MIL-J-Z1994B(OS) 3.6 Cleanliness. Necessary precautions shall be taken to protect the junction box components from moisture, solder splashes, chips and other foreign material during the assembly process. Requirement 9 of MIL-STD-454. 3.7 Workmanship. Workmanship sha
22、ll be in accordance with 4. QUALITY ASSURkVCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified. in the contract, the contractor is responsible for the performance of all inspection requirements as specified herein. specified in the contract, the contractor may use his own or
23、any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services con
24、form to prescribed requirements. Except as otherwise The Government . 4.2 Classification of inspections. Inspection of the item coverec by this specification shall be classified as follows: a. b. c. First article inspection (see 4.4) Quality conformance inspection (see 4.5) Periodic production testi
25、ng (see 4.6) 4.3 Test equipment. The following items of test equipment are necessary to perform the tests required in this specification: 4.3.1 An oheter having a range of 0.0 to 1.0 ohm and an accuracy of k 1. O percent. A resistance measuring device with 500 k 50 volts D-C potential, capable of me
26、asuring at least 50 megohms at ? 5 percent accuracy. Adanter Mark 31 type (Government furnished). 4.3.2 4.3.3 Test set Mark 115 type with Test Stand Mark 9 blod O and 4.4 First article inspection. First article sample approval wil be granted when the Government testing activity, through testing and
27、subsequent analysis of the test results, is assured of contractor conformance to the contract technical requirements. Conditional accep tance may be granted at the option of the Government based on analysis of detected defects. either nonconforming characteristics or unauthorized materials are found
28、. The tests of 4.7 and 4.8 will be performed in the sequence and with the sample quantities given in Figure 1. A first article sample may be disapproved when 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 B E k bc (d Q a 3 a E ci VI a ci a 5 x x
29、 n M U xxxx xx xxxx 4 N r. r. e e Md; r-r. ee AN e* MM v) r. M Co e M d; M M v) M ri M N M Co e Q) e rl M ln M bu d .rl ci (d k B N M v) M a k O ci v) 3 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-23774B 13 7777706 0303873 2 MIL- J - 2199
30、4B (OS a .rl 2 tJ FI O u u H k Ma, v) a, id 5 Q *d ci. a, kP O Wa, a, CI cb 2 !3 G k a, F p” O ci a, 9 u) tJ m a, ci id 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-239748 33 7779706 0303874 4 PIIL-J- 21994B(OS) 4.5 Quality conformance ins
31、pection. Each production unit shall be subjected to the examination of 4.7.2 and tests designated as 100 percent in 4.7 (see Table I). shall be cause for regarding the unit as defective. 4.6 Periodic production testing. After the quality conformance inspection, production shall be sampled periodical
32、ly for additional. testing, as shown in Table I and Figure 1, at a designated Government activity. 4.6.1 Periodic sampling. Each months production of junction boxes, unless otherwise specified, shall be designated as a lot for acceptance sampling. lot by the Government inspector. 4.6.2 Test result.
33、Failure of any periodic production sample to meet all of the specification, drawing, and contract requirements as a result of the test designated in Table I, may result in rejection of the lot. Any unit containing one or more defects Six units shall be selected at random from each 4.7 Examination an
34、d test methods. 4.7.1 Packaging. The packaging shall be examined to determine conformance to section 5 herein. 4.7.2 Visual examination. Each Junction Box Mark 43 Mod O shall be visually examined in accordance with the drawing 1378506 to determine compliance with this specification and its associate
35、d drawings as specified in 3.3.1. Examination in accordance with drawing 1378506 shall not relieve the contractor of his responsibility to meet all requirements of other drawings listed thereon. 4.7.3 Continuity test (100%). Using the ohmmeter, item 4.3.1, Verify that the resistance of measure the r
36、esistance of each electrical circuit of the junction box between directly connected terminals. every such circuit does not exceed 0.5 ohm. 4.7.4 Insulation resistance test (100%). Place the junction box within a conditioning chamber. a relative humidity of 75 t 5 percent and a temperature of 77F ? 2
37、F. Within 15 minutes after removal of the junction box from the chamber, measure the insulation resistance between each terminal of the junction box and every other terminal not electrically connected by design, and between each terminal and the junction box case, using the resistance measuring devi
38、ce, item 4.3.2. not less than 50 megohms. officer may allow the insulation resistance test of this paragraph to be conducted at ambient temperature and relative humidity without previous conditioning. However, if the junction box fails the test at ambient conditions, it shall be conditioned and test
39、ed in accordance with the procedure specified above. Maintain the junction box or 24 hours at Verify that the insulation resistance is To facilitate production, the contracting 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-J-21774B 13 777990
40、6 0301875 b MIL-J-21994B (OS) 4.7.5 Static magnetic effect test (100%). Test the Junction Box Mark 43 Mod O in accordance with Test Method II of OD 10511, under the general test conditions and definitions described therein. junction box on the Adapter Mark 31 Mod O on the Test Stand Mark 9 Mod O. ne
41、ar the four-contact connection, 512. To achieve this test distance, the adapter shall be located by adjusting the adapter plate until the indicators are positioned at the 10 1: 1/16 inch marks on the Test Stand Mark 9 Mod O. requirement of 3.4.3 during this test. Mount the The test face of the junct
42、ion box is the largest flat area face The test distance is five inches. The test sample shall meet the 4.8 Environmental tests. 4.8.1 Vibration. The junction box shall be rigidly fastened directly to the vibration table by either simulating the actual method of mounting used in service or by its ext
43、ernal case, whichever is appropriate. each of the three principal axes of the junction box for equal periods of time. slowly cycling at a logarithmic rate between the limits, or by at least 24 discrete frequency steps which have a logarithmic distribution. The vibration amplitude shall be maintained
44、 at 2.0 1: 0.2 g vector or 0.10 1: 0.01 inch, whichever is the lesser. is four hours. The total test duration shall be 12 hours. shall meet the requirements of 3.5.1 after this test. a continuous two-phase shock pattern acting in a direction parallel to the top and front faces of the box. The sample
45、s shall be shock-tested at a temperature of -65F. vehicle shall simulate service conditions, as follows: Simple harmonic excitation shall be applied parallel to The frequency range of 10 to 60 Hz may be covered either by Duration of the test in each direction The sample 4.8.2 Shock. The Junction Box
46、 Mark 43 Mod O shall be subjected to The mounting of the samples in the test The test pattern shall be a. The first (impact) phase shall consist of a velocity change of 5.: mi 11 is econd . to 7 feet per second in an elapsed time of 0.2 to 0.4 b. During the second (drag) phase, the junction box shal
47、l be accelerated for a minimum time of 15 milliseconds in such a manner that during this time the minimum acceleration is 90 gravity units. peak acceleration shall be between 125 and 150 gravity units. The The sample shall meet the requirements of 3.5.2 after this test. 4.8.3 Temperature tests. The
48、sample will be tested for physical 4.8.3.1 Operating. Subject the two sample junction boxes to the integrity and operability as specified below: quality conformance tests of 4.7.3 and 4.7.4, one each at 28“ 1: 2F and 90“ _+ 3“F(see Figure i). Verify that the requirements of 3.5.3.1 are met. 8 Provid
49、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-J-ZL77qB 13 7779706 0301876 8 m PIIIL - J- 219943 (OS) 4.8.3.2 Storage. Subject the junction boxes, packaged and packed as specified in section 5, to one 14-day TEMPERATURE AND HUMIDITY CYCLE .defined in MIL-STD-331, Test Method 105.1, except that relative humidity in the chamber need not be raised above room ambien
