1、Comments, suggestions or questions on this document should be addressed to Defense Supply Center Columbus, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to switchdla.mil. Since contact information can change, you may want to verify the currency of this address information usin
2、g the ASSIST Online database at https:/assist.daps.dla.mil/. AMSC N/A FSC 5930 INCH-POUND MIL-DTL-7703F 1 July 2010 SUPERSEDING MIL-DTL-7703E 31 January 2001 DETAIL SPECIFICATION GUARD, SWITCH, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the De
3、partment of Defense. 1. SCOPE 1.1 Scope. This specification covers the military requirements for hinged switch guards for use with toggle switches. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not
4、 include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in secti
5、ons 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of t
6、hese documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-83133 - Turbine Fuel, Aviation, Kerosene Type, JP-8 (NATO F-34), NATO F-35, and JP-8+100 (NATO F-37). MIL-PRF-87252 - Coolant Fluid, Hydrolytically Stable, Dielectric. STANDARDS MIL-STD-202 -
7、 Electronic and Electrical Component Parts. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-50
8、94.) NOTE: This draft dated October 31, 2000 prepared by DLA-CC, has not been approved and is subject to modification. DO NOT USE FOR ACQUITSTION PURPOSES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7703F 2 2.3 Non-Government publications
9、. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI/NCSL Z540-3 - Calibration Laboratories and Measuring and
10、 Test Equipment, General Requirements for. (Application for copies can be found online at http:/www.ansi.org/ or 25 West 43rd Street, New York, NY 10036-8002, telephone 212-642-4900, fax 212-302-1286) AMERICAN SOCIETY FOR TESTING AND MATERIALS ASTM E1119 - Glycol, Industrial Grade Ethylene, Standard
11、 Specification for (Copies of these documents are available online at www.astm.org or from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA, 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDS (ISO) ISO 10012-1 - Quality Assurance Requirements for Measur
12、ing Equipment - Part 1; Meteorological Confirmation System for Measuring Equipment. (Application for copies can be found online at http:/www.ansi.org/ or 25 West 43rd Street, New York, NY 10036-8002, telephone 212-642-4900, fax 212-302-1286) 2.4 Order of precedence. Unless otherwise notedherein or i
13、n the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless specific exemption
14、has been obtained. 3. REQUIREMENTS 3.1 MS standards. The individual item requirements shall be as specified herein and in accordance with the applicable (MS) standard. In the event of any conflict between the requirements of this specification and the MS standard, the latter shall govern (see 4.6.1)
15、. 3.2 Qualification. Switch guards furnished under this specification shall be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.5 and 6.3). 3.3 Requirements for switch guards not covered by MS standards. Unless otherwise sp
16、ecified (see 6.2.2), switch guards furnished under this specification and not covered by MS standards shall be products which have passed the inspection specified (see 4.3). -Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7703F 3 3.4 Materia
17、l. Material shall be as specified on the applicable MS standard (see 3.1). When a definite material is not specified, a suitable material shall be used which will enable the switch guards to conform to the performance requirements of this specification. Acceptance or approval of any constituent mate
18、rial shall not be construed as a guaranty of the acceptance of the finished product. 3.4.1 Fungus-proof materials. All materials shall be non-fungus nutrient (see 6.7 for guidance). Certification that the materials used are not fungi nutrients shall be submitted to the preparing activity as part of
19、the qualification test report. 3.4.2 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.
20、5) 3.5 Design and construction. The switch guards shall be of the design, construction, and physical dimensions specified (see 3.1). 3.5.1 Locking mechanism. The switch guard shall be constructed so that when it is closed, motion of the switch toggle shall be restricted as shown on the applicable MS
21、 standard (see 3.1). 3.6 Performance. 3.6.1 Operating force. When tested as specified (see 4.6.2) the operating force shall be within the limits specified on the applicable MS standard (see 3.1). 3.6.2 Hinge life. The switch guard shall satisfactorily complete 20,000 cycles of operation, without bre
22、akage or malfunction, when tested as specified (see 4.6.3). The switch guard shall be examined to insure that operation of switch guards, so designed, shall actuate the switch toggle to the position indicated on the applicable MS standard, and that switch guards not specifically designed to perform
23、this function shall not change the position of the toggle lever of the toggle switch. 3.6.3 Hinge strength. When tested as specified (see 4.6.4), there shall be no damage to the switch guard. Failures shall not occur below 33 pounds. 3.6.4 Shock (specified pulse). When switch guards are tested as sp
24、ecified (see 4.6.5) they shall not transfer from the open to the closed position or from the closed to the open position. The switch guard shall not cause separation of closed contacts or closure of open contacts exceeding the specified amount of time for the switch used in this test. There shall be
25、 no evidence of damage at the conclusion of this test. 3.6.5 Salt spray (corrosion). When switch guards are tested as specified (see 4.6.6) there shall be no evidence of damage or excessive corrosion. 3.6.6 Temperature shock. When switch guards are tested as specified (see 4.6.7) there shall be no e
26、vidence of damage. 3.6.7 Resistance to solvents. When switch guards are tested as specified (see 4.6.8) there shall be no deterioration or other damage. 3.6.8 Vibration. When the switch guards are tested as specified (see 4.6.9) they shall not transfer from the open to the closed position or from th
27、e closed to the open position. The switch guard shall not cause separation of the closed contacts or closure of the open contacts exceeding the specified amount of time for the switch used in this test. There shall be no evidence of damage at the conclusion of this test. 3.6.9 Switch contact movemen
28、t. When the switch guard is in the closed position it shall not cause the switch contacts to transfer as tested (see 4.6.3, 4.6.5 and 4.6.9). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7703F 4 3.7 Marking. Switch guards shall be marked i
29、n accordance with MIL-STD-1285, with the MS standard part number or manufacturers part number, as applicable, and the manufacturers name, trademark, or code symbol. Insert markings shall be white. 3.8 Workmanship. Switch guards shall be processed in such a manner to be free from cracked parts, sharp
30、 edges, burrs, and other defects that will affect life, serviceability, or appearance. 4. VERIFICATION 4.1 Classification of inspection. The examination and testing of switch guards shall be classified as follows: a. Qualification inspection (see 4.4). b. Requirements for switch guards not covered b
31、y MS standards (see 4.4.5). c. Conformance inspection (see 4.5). 4.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained by
32、the contractor. The establishment and maintenance of a calibration system to control the accuracy of the measuring and test equipment shall be in accordance with ANSI/NCSL Z540-3, ISO 10012-1 or approved equivalent 4.3 Inspection conditions. Unless otherwise specified herein, all tests and measureme
33、nts required by this specification shall be made at room ambient conditions, in accordance with the general requirements of MIL-STD-202. 4.4 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to the Government (see 6.3) on sample units produced with equi
34、pment and procedures normally used in production. 4.4.1 Sample. For qualification inspection, the sample size shall be as specified in table I. 4.4.2 Failures. Failure of any sample to comply with the applicable requirements shall be cause for refusal to grant qualification. 4.4.3 Test data. Each su
35、bmission shall be accompanied by test data covering the tests listed in table I. All test data shall be submitted in triplicate. 4.4.4 Certification of material. When submitting samples for qualification, the manufacturer shall submit certification that the materials used are in accordance with the
36、applicable specification requirements or state the materials used. The manufacturer shall submit a cross reference list of the switch guard parts and materials with the qualification test report. 4.4.5 Requirements for switch guards not covered by MS standards. Unless specified otherwise in the orde
37、ring data, the inspection requirements shall be in accordance with 4.3. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7703F 5 TABLE I. Qualification test sequence. Inspection Requirement paragraph Test paragraph Sample 1 2 3 4 5 6 7 8 9 10
38、Inspection of product 3.1 4.6.1 X X X X X X X X X X Operating force 3.6.1 4.6.2 X X X X X X X X X X Hinge life 3.6.2 4.6.3 X X Hinge strength 3.6.3 4.6.4 X X Shock (specified pulse) 3.6.4 4.6.5 X X Salt spray (corrosion) 3.6.5 4.6.6 X X Temperature shock 3.6.6 4.6.7 X X Resistance to solvents 3.6.7
39、4.6.8 X X Vibration 3.6.8 4.6.9 X X Operating force 3.6.1 4.6.2 X X X X X X X X X X Inspection of product 3.1 4.6.1 X X X X X X X X X X 4.5 Conformance inspection. 4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection. 4.5.1.1 Group A inspec
40、tion. Group A inspection shall consist of the inspections specified in table II. Statistical sampling and inspection shall be in accordance with table III, subgroup 1. Inspection of product shall be limited to checking of marking and workmanship. Of each 1,000 switch guards produced, two each shall
41、be inspected for compliance with physical dimensions. 4.5.1.2 Inspection lot. All switch guards that appear on the same MS standard and that are offered for delivery at one time shall be considered a lot for purposes of sampling and inspection. 4.5.1.3 Rejected lots. If an inspection lot is rejected
42、, the contractor may withdraw the lot, rework it to correct the defects or screen out the defective units, as applicable, and reinspect. Such lots shall be kept separate from new lots and shall be clearly identified as reinspected lots. Rejected lots shall be reinspected using tightened inspection.
43、TABLE II. Group A inspection. Inspection Requirement paragraph Test paragraph Sampling plan Inspection of product 3.1 4.6.1 See 4.5.1.1 Hinge strength 3.6.3 4.6.4 Subgroup I Operating force 3.6.1 4.6.2 Subgroup I Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
44、om IHS-,-,-MIL-DTL-7703F 6 TABLE III. Zero defect sampling plan. Lot size Minimum number of samples to be tested Subgroup 1 Subgroup 2 1 - 8 5 All 9 - 50 5 13 51 - 90 7 13 91 - 150 11 13 151 - 280 13 20 281 - 500 16 29 501 - 1200 19 34 1,201 - 3200 23 42 3,201 - 10,000 29 50 10,001 - 35,000 35 60 4.
45、6 Methods of inspection. 4.6.1 Inspection of product. Switch guards shall be examined to determine compliance with materials, workmanship, marking and the applicable MS standard requirements. 4.6.2 Operating force (see 3.6.1). The force required to open or close the switch guard shall be measured by
46、 applying the force in the following directions: a. Open - tangent to the radius of the switch guard lever in a plane perpendicular to the plane of the mounting plate. b. Close - horizontal to the plane of the mounting plate. 4.6.3 Hinge life (see 3.6.2 and 3.6.9). Switch guards shall complete 20,00
47、0 cycles of operation at a rate not to exceed one cycle per second. The switch guards shall be mounted on a metal panel with any Military Standard switch, for which it is designed. The switch guards shall be mounted such that at least 1 1/2 threads of the switch bushing are exposed. Each cycle shall
48、 consist of moving the switch guard from the fully closed to the fully open position and then return to the fully closed position. Switch guards that are spring loaded to the closed position shall return to the closed position by spring action. The switch contacts shall be monitored for movement dur
49、ing this test. Contact chatter shall be monitored in accordance with method 310, test condition A of MIL-STD-202. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7703F 7 4.6.4 Hinge strength (see 3.6.3). Switch guards shall be mounted as shown in figure 1. A force, which shall be gradually increased to 33 pounds, shall be applied
