1、 MIL-DTL-55422B 11 August 2011 SUPERSEDING MIL-DTL-55422A 15 December 2001 DETAIL SPECIFICATION CLIP, ELECTRICAL, GRID AND ANODE, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification esta
2、blishes the general requirements for grid and anode types of electrical clips for electron tubes. 1.2 Classification. 1.2.1 Part or identifying Number (PIN). PINs to be used for clip acquired to this specification are created as follows: M 55422/ 1 -01 Military General Specification Dash designator
3、specification sheet number number number (1 digit) (see 3.1) 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 include documents cited in other sections of this specification or recommended for add
4、itional 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 sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government docum
5、ents. 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 these documents are those cited in the solicitation or contract. Comments, suggestions o
6、r questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to relaydla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at h
7、ttps:/assist.daps.dla.mil. AMSC N/A FSC 5999 INCHPOUNDProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-55422B 2 COMMERCIAL ITEM DESCRIPTION A-A-59588 - Rubber, Silicone. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-16878 - Wire, Electrical, In
8、sulated, General Specification for. MIL-DTL-55422/1 - Clip, Electrical, Grid. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-129 - Military Marking for Shipment and Storage. MIL-STD-202 - Electronic and Electrical Components Parts. MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests
9、. MIL-STD-889 - Dissimilar Metals. 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 19111-5094.) 2.3
10、Non-Government publications. 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 SOCIETY FOR TESTING AND MATERIALS (ASTM International) ASTM B194 - Cop
11、per-Beryllium Alloy Plate, Sheet, Strip, and Rolled Bar. ASTM B545 - Electrodeposited Coatings of Tin. (Application for copies can be made online at http:/www.astm.org or from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE Internati
12、onal) SAE-AMS-QQ-P-416 - Plating Cadmium (Electrodeposited). (Applications for copies can be made online at http:/www.sae.org or from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a co
13、nflict 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 a specific exemption has been obtained. 3. REQUIREMENTS
14、 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheets. In the event of any conflict between requirements of this specification and specification sheet, the latter shall govern. Provided by IHSNot for Resale
15、No reproduction or networking permitted without license from IHS-,-,-MIL-DTL-55422B 3 3.2 Material. The material for each part shall be as specified (see 3.1). When a definite material is not specified, a material that will enable the clips to meet the requirements of this specification shall be use
16、d. Acceptance or approval of a constituent material shall not be construed as a guarantee of the acceptance of the finished product. Materials shall be non-nutrient to fungus growth. Submission of certification that materials used are noon-nutrient to fungus growth will be considered compliance with
17、 this requirement without testing. If certification is not furnished, clips shall be subjected to the fungus-resistance test of method 508, procedure I, of MIL-STD-810. 3.2.1 Ceramic. Ceramic material shall conform to requirements in table I or better. TABLE I. Ceramic requirements. Dielectric const
18、ant 12 or under Dielectric loss index at 1 MHz .016 maximum Dielectric strength average 200 to 249, inclusive Flexural strength (modulus of rupture) 12,000 to 19,000 inclusive 3.2.2 Metals. 3.2.2.1 Beryllium-copper alloy. Beryllium-copper alloy shall conform to ASTM B194 and shall be suitably heat t
19、reated after forming and prior to cleaning and plating. 3.2.3 Silicone rubber. Silicone rubber shall conform to class 3B of A-A-59588. 3.2.4 Corrosion-resistance. The clips shall be fabricated of a corrosion-resistant material or be treated to prevent corrosion formation. 3.3 Design and construction
20、. The clips shall be of the material, design, construction, and physical dimensions specified (see 3.1). 3.4 Finish. Finish shall be electro-tin plate as specified in ASTM B545. The clips shall be plated so that before and after the environmental tests specified herein, there shall be evidence of pe
21、eling, cracking, or corrosion. Unless specifically approved by the acquiring activity, no additional insulating material shall be applied. 3.4.1 Cadmium plating. Cadmium plating shall conform to class 2, type II of SAE AMS QQ-P-416. 3.5 Dissimilar metals. When dissimilar metals are used in intimate
22、contact with each other, protection against electrolysis and corrosion shall be provided. The use of dissimilar metals which, in contact, tend toward active electrolytic corrosion (particularly brass, copper, or steel used in metals) shall be as specified in MIL-STD-889. 3.6 Salt spray (corrosion).
23、When clips are tested as specified in 4.5.2.1, the base metal shall show no evidence of corrosion on blistering of plated surfaces. 3.7 Vibration. When tested as specified in 4.5.2.2, the clip shall display no evidence of cracking, breaking, loosening of parts, wear or damage to the clip, nor loss o
24、f electrical continuity of the contact circuit for a period greater than 10 microseconds. 3.8 Thermal shock. When tested as specified in 4.5.2.3, the clip shall retain a force on the test plug of not less than 80 percent as measured before the test. There shall be no cracking or chipping of the cera
25、mic insulated clips. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-55422B 4 3.9 Shock. When tested as specified in 4.5.2.4, there shall be no evidence of mechanical damage to the clip. The clip shall retain a force on the test plug of not l
26、ess than 80 percent as measured before the test. 3.10 Retaining and release force. When clips are tested as specified in 4.5.2.5, the force required to couple and uncouple the clip shall be within the limits specified (see 3.1). 3.11 Dielectric withstanding voltage. When clips are tested as specifie
27、d in 4.5.2.6, there shall be no evidence of damage, arcing, or breakdown. 3.12 Cleaning and drying. Gaskets shall be cleaned and dried by any suitable process or processes that are not injurious to the item. 3.13 Identification marking. The clips shall be legibly and durably marked with the Part or
28、Identifying Number (PIN) and the manufacturers identification in accordance with MIL-STD-1285. 3.14 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material mee
29、ts or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.15 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of clip and solder shall not exceed 97 percent, by mass
30、. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3). 3.16 Workmanship. The clips shall show no evidence of cracks, fissures, peeling, or chipping of the plating or finish. When examined (see 4.4.1), there shall be no evidence of poor molding, poor fabrication techniques, or fo
31、reign material. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2). b. Conformance inspection (see 4.4). 4.2 First article inspection. Component-materials inspection shall consist of verific
32、ation that the component materials listed in table II fabricating the electrical clips are in accordance with the applicable referenced specifications or requirements prior to such fabrication. TABLE II. First article inspection. Component material Requirement paragraph Insulation: Ceramic Silicone
33、rubber 3.2.1 3.2.3 Metals: Beryllium-copper alloy 3.2.2.1 Finish: Tin plating 3.4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-55422B 5 4.3 Inspection conditions. Unless otherwise specified herein, test conditions shall be as specified in
34、MIL-STD-202. 4.4 Conformance inspection. 4.4.1 In-process inspection. Inspection of product for delivery shall consist of groups A and B. Sampling plans and procedures for inspection shall be as specified in table III. 4.4.1.1 Inspection lot. An inspection lot shall consist of all the clips of the s
35、ame material, configuration, and dimensions, manufactured under essentially the same conditions and submitted for conformance inspection and testing at one time. 4.4.1.2 Rejected lots. If an inspection lot is rejected, the supplier may withdraw the lot, rework it to correct the defects, or screen ou
36、t defective units, as applicable, and reinspect. Such lots shall be separated from new lots and shall be clearly identified as reinspected lots. Rejected lots shall be inspected using tightened inspection. 4.4.1 3 Group A. inspection. Group A inspection shall consist of the inspections in 4.5.1 with
37、 the sample sizes of table III. TABLE III. Group A inspection. 4.4.1.3.1 Disposition of sample units Sample units which have been subjected to group A inspection shall be delivered on the contract or order. 4.4.1.4 Group B inspection. Group B inspection shall consist of the tests specified in table
38、IV in the order shown. Lot size Inspection of product 2 to 8 9 to 15 16 to 25 26 to 50 51 to 90 91 to 150 151 to 280 281 to 500 501 to 1,200 1,201 to 3,200 3,201 to 10,000 10,001 to 35,000 35.001 to 150,000 150,001 to 500,000 500,000 and over 100 percent13 13 13 13 13 20 29 34 42 50 60 74 90 102 Pro
39、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-55422B 6 TABLE IV. Group B inspection. Test Requirement paragraph Method paragraph Group I Vibration Thermal shock Shock Retaining and release force 3.7 3.8 3.9 3.10 4.5.2.2 4.5.2.3 4.5.2.4 4.5.2.5
40、 Group II Dielectric withstanding voltage Salt spray 3.11 3.6 4.5.2.6 4.5.2.1 4.4.1.4.1 Sampling plan. Each year six sample units shall be selected from the first lot and divided into two subgroups of three each. No failures shall be allowed. Group B inspection shall be performed on sample units tha
41、t have passed group A inspection, unless the Government considers it more practical to select a separate sample from the lot for group B inspection. 4.4.1.4.2 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be delivered on the contract or order. 4.
42、5 Methods of inspection. 4.5.1 Inspection of product. Clips shall be examined for compliance with applicable design, construction, physical dimensions, marking, and workmanship requirements (see 3.1, 3.13, and 3.16). 4.5.2 Test procedures. 4.5.2.1 Salt spray (corrosion) (see 3.6). Sample clips shall
43、 be tested in accordance with MIL-STD-202, method 101, condition A. Salt concentration shall be 5 percent. After the test, the clips shall be examined for exposure of base metal or blistering of the plated surface. 4.5.2.2 Vibration, high frequency (see 3.7). Clips shall be tested in accordance with
44、 MIL-STD-202, method 204, and with the following exceptions and details: a. Specimens shall be mounted in a normal manner to a test plug which shall be fastened to the vibration machine. The clip shall be mated to the plug or tube without the use of safety wire or other supplementary locking devices
45、. The lead wire shall be supported by a stationary frame not closer than 12 inches (30.48 cm) from the mated clip and tube cap or test plug. The wire shall conform to MIL-DTL-16878. b. Test condition letter D. c. The clips shall be wired and current allowed to flow at the maximum operating rated vol
46、tage and current of the tube with which the clip mates. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-55422B 7 d. The vibration shall be conducted in each of three mutually perpendicular directions at the following temperature conditions: (
47、1) -65C: 25 percent of the time. (2) +265C: 25 percent of the time. (3) Normal temperature conditions: 50 percent of the time. e. The circuit shall be monitored for circuit continuity before, during, and after the vibration. A discontinuity of contact or interruption of current flow for more than te
48、n microseconds shall not be allowed. 4.5.2.3 Thermal shock. Clips shall be tested in accordance with MIL-STD-202, method 107, test condition C, and shall meet the requirements of 3.8. 4.5.2.4 Shock (see 3.9). Clips shall be tested in accordance with method 202 of MIL-STD-202. The following details a
49、nd exceptions shall apply: a. Mounting of specimens. By their normal mounting means with the test plug fastened to the shock machine and the clip coupled to the test plug. b. Acceleration. 50 gravity units. c. Number of blows. Four d. Direction of blows. One direction shall be in the axis of the test plug, away from the open end of the clip, and the other
