1、L I MIL-T-55b31 59 - 7799906 00761192 3 = E- i TRANSFORMERS; INTERMEDIATE FREQUENCY, RADIO FREQUENCY, AND DISCRIMINATOR, GENERAL SPECIFICATION FOR MIL-T-55631 xuuuz=- MILITARY SPECIFICATION This specification is mandatory for use by all Depart- ments and Agencies of the Department of Defense. 1. SCO
2、PE 1.1 Scope. This specification covers the requirements for tuned and untuned intermediate, radio frequency, and discriminator transformers. These inductive components may be combined with additional circuit elements such as capacitors and resistors which are functionally related to the inductive e
3、lements for the purpose of coupling, impedance conversion, and isolation. 1.2 Classification. Transformers covered by this specification shall be of the following types, grades, and classes as specified (see 3.1 and 6.1): Type I - Intermediate frequency transformer. Type II - Radio frequency transfo
4、rmer. Type IiI - Discriminator transformer. Grade 1 - For use when immersion and moisture resistance tests (see 4.7.19 and 4.7.20) Grade 2 - For use when moisture resistance test (see 4.7.20) is required. Grade 3 - For use in sealed assemblies. are required. Class O - 85“ C maximum operating tempera
5、ture. Class A - 105“ C maximum operating temperature. Class B - 125 C maximum operating temperature. Class C - 125“ C maximum operating temperature. NOTE: The class denotes the maximum operating temperature (temperature rise plus maximum ambient temperature). 2. APPLICABLE DO(SCTMENTS 2.1 The follow
6、ing documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL QQ-S-57 1 QQ-S-781 PPP-B-566 PPP-B-685 PPP-B-636 PPP-B-676 PPP-B-601 PPP-B-62 1 PPP-F-60 PPP-T-76 - Solder; Tin Alloy
7、; Lead-Tin Alloy; and Lead Alloy. - Strapping, Steel, Flat and Seals. - Boxes, Folding, Paperboard. - Boxes, Wood, Wirebound. - Box, Fiberboard. - Boxes, Getup. - Boxes, Wood, Cleated-Plywood. - Boxes, Wood, Nailed and Lock-Corner. - Tape: Pressure-Sensitive Adhesive, Waterproof, For Packaging. - Ta
8、pe, Pressure-Sensitive Adhesive Paper, (For Carton Sealing). THIS DOCUMENT CONTAINS . 2.7 . PAGES FSC 6950 E Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ .-_I -I L-, -1 . - MIL-T-55631 57 W 7977706 0076493 5 m I I MIL-T-55631 SPECIFICATIONS MILI
9、TARY . MIL-P-116 - Preservation, Methods of. MIL-W - 583 - Wire, Magnet, Electrical, . MIL-F-14256 - Flux, Soldering, Liquid (Rosin Base). MIL-B-43014 - Boxes, Water Resistant Paperboard, Folding, Set-up and Metalaayed. - MIL-C-45662 - Calibration System Requirements. STANDARDS MILITARY MIL-STD- 105
10、 MIL-STD-129 MIL-STD- 147 MIL-STD-202 MIL-STD-275 MIL-STD-454 . ._ . MIL-STD-810 MIL-STD- 127 6 MIL-STD-1285 - Sampling Procedures and Tables for Inspection by Attributes. - Marking for Shipment and Storage. - Palletized and Containerized Unit Loads 40“ x 48“ Pallets, Skids, Runners, or Pallet-Type
11、Base. - Test Methods for Electronic and Electrical Component Parts. - Printed Wiring for Electronic Equipment. - Standard General Requirements for Electronic Equipment. -. .Envir.onmental Test-Methads. . . . - Leads, Weldable, For Electronic Component Parts. - Marking of Electrical and Electronic Pa
12、rts. (Copies of specifications, standards, drawings, and publications required by suppliers in con- nection 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 t
13、his specification to the extent specified herein. Unless otherwise indicated, the issue in effect on the date of invitation for bids or request for proposal shall apply. NATIONAL BUREAU OF STANDARDS Handbook H28 - Screw-Thread Standards for Federal Services. (Application for copies should be address
14、ed to the Superintendent of Documents, Government Printing Office, Washington, DC 20402. ) 3. REQUIREMENTS 3.1 Detail requirements. Detail requirements or exceptions applicable to individual types of transformers shall be as specified in the applicable drawing or procurement document (see 6.1). In t
15、he event of any conflict between requirements of this specification and the drawing or procurement document, the latter shall govern (see 6.1). 3.2 First article. Transformers furnished under this specification shall be products which have been tested and have passed the first article inspection spe
16、cified in 4.5 (see 6.2). First article approval is vaid only on the contract under which it is granted, unless extended by the Government to another contract. 3.2.1 Information to be furnishedwith the first article sample. The applicable information out- lined in 6.1 shall be furnished with the firs
17、t article sample, together with any other pertinent infor- mation as required by the Government. L -. . / - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-T-55631 MIL-T-55631 59 797970b 007b494 7 I 3.3 Materials. The materials shall be as speci
18、fied herein; however, when a definite material is not specified, a material shall be used which will enable the transformers to meet the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the fi
19、nished product. Insofar as practicable, materials used in the construction of transformers shall be noncorrosive; nonexplosive; shall not be susceptible to out-gassing;andnonnutrient to fungus growth, or suitably treated to retard fungus growth. specified material or fabricated part, he shall submit
20、 a statement to the Government describing the proposed substitution, together with evidence to substantiate his claims that such substitute is suit- able. At the discretion of the Government, test samples may be required to prove the suitability of the proposed substitute. Before such substitutions
21、are made, approval for each substitution shall be obtained in writing from the Government. 3.3.1 Substitution of materials. if the supplier desires to substitute another material for a 3.3.2 Solder and soldering flux. Solder and soldering flux shall conform to requirement 5 of MIL-STD-454. 3.3.3 Mag
22、net wire. Magnet wire shall conform to the types and sizes specified in MIL-W-583. 3.3.4 Resistors and capacitors. Resistors and capacitors shall be in accordance with military specifications and standards, except when the size, design, and environmental characteristics of the transformer prohibit.
23、3.3.5 Screws, nuts, and washers. All mounting and terminal screws, nuts, and washers shall be of corrosion-resistant material or shall be protected against corrosion. 3.4 Design and construction. Transformers shall be of the design, construction, weight, and physical dimensions specified (see 3.1 an
24、d 6.1). 3.4.1 Threaded parts. Unless otherwise specified (see 3.1 and 6. i), all threaded parts shall be in accordance with Handbook H28. 3.4.1.1 Engagement of threaded parts. Unless otherwise specified (see 3.1 and 6. i), all threaded 3.4.2 External can shields (when applicable, see 3.1 and 6.1). E
25、xternal can shields shall be so parts shall engage by at least three full threads. constructed that they can be effectively mounted mechanically and grounded electrically by their normal mounting means. 3.4.3 Terminals (see 3.1 and 6.1). 3.4.3.1 Solder-type terminals, Solder terminals may be of any
26、shape, and solderability of terminals shall comply with the requirementsof 3.12. The height of the solder terminal shall be considered as the maximum distance from the terminal mounting surface to thehighestpoint, including the additional height obtained if semiflexible terminals are straightened. (
27、It is not intended that the “hook“ in the hook-type terminal be straightened from its normal hooked position. ) The type of terminal and the maximum size of round wire which the terminal will accept externally shall be as specified (see 3.1 and 6.1). 3.4.3.2 Solderable/weldable lead terminals. Unles
28、s otherwise specified (see 3.1 and 6. i), the manufacturer shall verify by certification that all leads conform to type C of MIL-STD-1276. 3.4.3.3 Pin-type terminals for printed circuit applications. The preferred diameter for the terminal pins of printed circuit transformers is O. 028 inch. The gri
29、d matrix shall conform to a O. 1 inch matrix in accordance with MIL-STD-275 with centers to a tolerance of f O. 002 inch. Uninsulated solid wire terminals not greater than 1 inch in length shall be considered to be pins. sockets shall conform with standard 7-pin base E7-1 or standard 9-pin base E9-1
30、 (see figure 1). Uninsulated solid wire terminalsnot greater than 1 inch in length shall be considered to be pins. 3.4.3 4 the insulation resistance shall be as specified in 3.8 (for grade 1 units) or not less than 100 megohms (for grade 2 units); and there shall be no evidence of corrosion affectin
31、g the mechanical or electrical operation of the units. 3.24 Visual and mechanical examination (post test). When transformers are examined as speci- fied in 4.7.1.1.1, not more than 10 percent of the surface shall have peeling, flaking, chipping, cracking, crazing, or other impairment of the protecti
32、ve coating. There shall be no leakage of the filling material, and no evidence of other physical damage, such as cracks, bursting, or bulging of the case, or corrosion affecting the mechanical or electrical operation of the units. 3.25 Flammability (when applicable, see 3.1 and 6.1). When transforme
33、rs are tested as specified in 4.7.21, there shall be no evidence of violent burning which results in an explosive-type fire, and the coating material used on the transformers shall be self-extinguishing. A transformer shall not be considered to have failed, in the event that it is consumed by the ap
34、plied flame, unless dripping of flaming material or an explosive-type flame has occurred. A transformer shall be considered to have failed only if an explosion or dripping of flaming material occurs, an explosive-type flame is produced, or if visible burning continues beyond the allowable duration o
35、f 3 minutes after removal of the applied flame. Material will be considered self-extinguishing if the following conditions are met: (a) The duration of visible flame does not exceed 3 minutes after removal of the applied (b) There is no explosion, nor anyviolent burning which results in an explosive
36、-type flame. (c) There is no dripping of flaming material from the transformer under test. flame. 3.26 Fungus. The manufacturer shall certify that all external materials are fungus resistant, or shall perform the test specified in 4.7.22. When transformers are tested as specified in 4.7.22, there sh
37、all be no evidence of fungus growth on the external surfaces. 3.27 Marking. Transformers shall be marked in accordance with method I of MIL-STD-1285. Marking shall include the date code, the item identifying part number assigned by the applicable drawing or procurement document (see 3. i), an item i
38、dentifying part number assigned by the manu- facturer, and code symbols for both part numbers. The marking may be applied to more than one side of the case if the required marking requires more space than is available on the one side. Where the surface areas are insufficient for all of the required
39、information, as many as possible of the markings shall be applied using the order of precedence listed in MIL-STD-1285. Markings shall remain legible after all tests. 3.271 1 Terminal identification. Unless otherwise specified (see 3.1 and 6. i), terminals shall be identified by appropriate numbers
40、or where space does not permit numbering, by color coding in accordance with table I. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-T-55631 Color No. Color Black O Green Brown 1 Blue Red 2 Violet Orange 3 Gray Yellow 4 White No, 5 6 7 8 9 Re
41、quirement paragraph Material Applicable document 4.4 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with the test conditions specified in the “GENERAL REQUIREMENTS of MIL-STD-202. 4.4.1 Test voltage. The test voltage shall contain no more t
42、han 5-percent harmonic distortion. 4.4.2 Test frequency. The test frequency used shall be within io. 1 percent of the nominal value. Solder and soldering flux - - - Magnet wire - - - - - - - - - terminals - - - - - - - - - - Solder able/w e ldable lead 4.4.3 Demagnetization. When necessary to overco
43、me remanence effects, demagnetization is permitted. - . 3.3.2 MIL-STD-454 3.3.3 MIL-W- 58 3 3.4.3.2 MIL-STD-1276 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Examination or test MIL-T-55631 Requirement paragraph MIL-T-55b31 59 W 9999906 007b497
44、b W - Method paragraph 4.7.1.1 4.7.2 4.7.3.1 4.7.3.2 4.7.4 4.7.5 4.7.6 4.7.7 4.7.8 4.7.9 4.7.10 4.7.11 4.7.3.1.2 4.7.5 4.7.6 4.7.1.1 4.7.12 4.7.13 4.7.14 4.7.6 4.5 First article inspection. First article inspection shall be performed by the supplier, after award of contract and prior to production,
45、at a location acceptable to the Government. First article inspection shall be performed on sample units which have been produced with equipment and pro- cedures normally used in production. First article approval is valid only on the contract or purchase order under which it is granted, unless exten
46、ded by the Government to other contracts or purchase orders. 4.5.1 Sample size. Twenty-one sample units shall be subjected to first article inspection; how- ever, two additional sample units shall be required if certification is not provided for the fungus test, and three additional sample units sha
47、ll be required when a comparison standard is used (see 4.5.2.1). Temperature rise (when applicable) Resistance to soldering heat (when applicable) (3 samPledts)- - - - - - - - - - - - - - - - - - - (3 sampleunits)- - - - - - - - - - - - - - - - Electrical characteristics - - - - - - - - - - - - - -
48、Terminal strength - - - - - - - - - - - - - - - - - 3.15 3.16 3.17 3.9 Group I (All sample units excluding those for group II inspection) Visual and mechanical examination (external) - - - - Seal (when applicable)- - - - - - - - - - - - - - - - - Dielectric withstanding voltage: At atmospheric press
49、ure - - - - - - - - - - - - - - At barometric pressure (when applicable) - - - - - induced voltage (when applicable) - - - - - - - - - - Insulation resistance - - - - - - - - - - - - - - - - - Electrical characteristics - - - - - - - - - - - - - - Stability at temperature extremes - - - - .- - - - - - Operating torque (when applicable)- - - - - - - - - - Group II (3 sample units) 3.1, 3.3, 3.4, 3.27, and 3.28 3.5 3.6 3.6 3.7 3.8 3.9 3.10 3.11 Solderability (when applicable) - - - - - - -
