1、AMSC/NA FSC 5950 INCH - POUND MIL-PRF-15305F 6 May 2013 SUPERSEDING MIL-PRF-15305E 17 July 1979 PERFORMANCE SPECIFICATION COILS, ELECTRICAL, FIXED AND VARIABLE, RADIO FREQUENCY GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defen
2、se. 1. SCOPE 1.1 Scope. This specification covers the general requirements for radio frequency coils, fixed and variable, for use as simple inductive elements in radio frequency circuits. Procurement of coils of a specific design will require additional data in the form of complementary Service docu
3、ments, giving detail electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein (see 3.1). 1.2 Classification. 1.2.1 Type designation. The type designation will be in the following form and as specified (see 3.1
4、and 6.2). LT4 K Style (1.2.1.1) Family (1.2.1.2) 1.2.1.1 Style. The style is identified by the two-letter symbol “LT” followed by a one or two digit number. The letters identify radio frequency coils; the number identifies the grade and class in accordance with table I, 1.2.1.1.1, and 1.2.1.1.2. TAB
5、LE I. Grade and class. Number Grade Class 1 1 C 2 2 C 3 3 C 4 1 B 5 2 B 6 3 B 7 1 O 8 2 O 9 3 O 10 1 A 11 2 A 12 3 A Comments, suggestions, or questions on this document should be addressed to DLA Land and Maritime ATTN: DLA Land and Maritime-VAT, P.O. Box 3990, Columbus, Ohio 43218-3990, or email t
6、o Transformerdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-15305F 2 1.
7、2.1.1.1 Grade. The grades, including their environmental characteristics, are as follows: Grade 1 Resistant to the moisture resistance test (see 4.6.14). Grade 2 Resistant to the moisture resistance test (see 4.6.14). Grade 3 For use in sealed assemblies. 1.2.1.1.2 Class. The classes of coils denoti
8、ng the maximum operating temperatures (temperature rise) (see 4.6.6 and 4.6.6.1) plus maximum ambient temperature are as follows: Class O - - - - - - - - 85C Class A - - - - - - - - 105C Class B - - - - - - - - 125C Class C - - - - - - - - 125C 1.2.1.2 Family. The family is identified by a single le
9、tter indicating its function as follows: K - - - - - - - - - - - Coil, radio frequency, fixed. V - - - - - - - - - - - Coil, radio frequency, variable 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
10、not 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 completeness of this list, document users are cautioned that they must meet all specified requirement documents cited in section 3
11、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 these d
12、ocuments are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-H28 - Screw-Thread Standards for Federal Services. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Test Methods, for Electronic and Electrical Component Parts. MIL-STD-810 - Environmental Test Methods. MIL-STD-1276 - L
13、eads, Weldable, for Electronic Component Parts. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at http:/quicksearch.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3
14、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. (see 6.2). INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 10012 - Mea
15、surement Management Systems - Requirements for Measurement Processes and Measuring Equipment. (Copies of this document are available online at www.iso.org or from International Organization for Standardization, 1, ch. de la Voie-Creuse, Case postale 56 - CH-1211 Geneva 20, Switzerland.) NATIONAL CON
16、FERENCE OF STANDARDS LABORATORIES (NCSL) NCSL Z540.3 - Requirements for Calibration of Measuring and Test Equipment. (Copies of this document are available online at www.ncsli.org or from NCSL International, 1800 30th Street, Suite 305, Boulder, CO 80701-1026.) Provided by IHSNot for ResaleNo reprod
17、uction or networking permitted without license from IHS-,-,-MIL-PRF-15305F 3 (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational s
18、ervices.) 2.4 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been ob
19、tained. 3. REQUIREMENTS 3.1 Specification sheets. The individual part requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern
20、(see 6.2). 3.2 Qualification. Coils furnished under this specification and covered by specification sheets (or military standards) listed in supplement 1B shall be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.4 and 6.3)
21、. 3.3 Material. The materials for each part shall be as specified herein; however, when a definite material is not specified, a material shall be used which will enable the coils to meet the performance requirements of this specification. Acceptance or approval of any constituent material shall not
22、be construed as a guaranty of the acceptance of the finished product. Reclaimed materials shall be used to the maximum extent possible. 3.3.2 Flammable materials. In so far as practicable, materials used in the construction of the coils shall be nonflammable and nonexplosive. 3.3.3 Corrosive materia
23、ls. Corrosive materials used in any of the manufacturing processes shall be removed or neutralized so that no corrosion will result from such use. In so far as practicable, materials used in the construction of coils shall be noncorrosive. 3.3.4 Threaded parts. Threaded parts shall be of corrosion-r
24、esistant material or shall be protected against corrosion. 3.3.5 Screws, nuts, and washers. All mounting and terminal screws, nuts, and washers shall be corrosion-resistant material or shall be protected against corrosion. 3.3.6 Pure tin. The use of pure tin, as an underplate or final finish, is pro
25、hibited both internally and externally. Tin content of coil components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.8). 3.3.7 Solder and soldering flux. Solder and solder flux shall be of such quality as to enable the coil to
26、meet all requirements of this specification. In addition, solder shall have a liquidus melting point greater than +270C. Additional information and guidance on solder and soldering flux is provided in 6.9. 3.4 Design and construction. Coils shall be of the design, construction, and physical dimensio
27、ns specified (see 3.1). 3.4.1 Threaded parts. Unless otherwise specified (see 3.1), all threaded parts shall be in accordance with FED-STD-H28. 3.4.1.1 Engagement of threaded parts. Unless otherwise (see 3.1), all threaded parts shall engage by at least three full threads. 3.4.2 Terminals. Terminals
28、 shall be of the shape and physical dimensions specified (see 3.1). 3.4.2.1 Solderable/weldable lead terminals. Unless otherwise specified (see 3.1), the manufacturer shall verify that the leads conform to one of the solderable/weldable lead type of MIL-STD-1276 or an approved equivalent 3.4.2.2 Win
29、ding ends. The termination of the winding ends shall not depend on solder alone to attain mechanical strength. 3.4.3 Weight. Coils shall not exceed the weight specified (see 3.1). 3.5 Thermal shock. When coils are tested as specified in 4.6.2, all windings shall be electrically continuous (see 3.6 a
30、nd 4.6.3). There shall be no dielectric breakdown or impairment of protective coatings. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-15305F 4 3.6 Winding continuity (when applicable). When coils are tested as specified in 4.6.3, all windin
31、gs shall be electrically continuous. 3.7 Operating torque (applicable only to variable coils). When coils are tested as specified in 4.6.4, the torque required to rotate the tuning core shall be within the limits specified (see 3.1). 3.8 Electrical characteristics. The electrical characteristics sha
32、ll be as specified (see 3.1 and 4.6.5). 3.8.1 Inductance. When coils are tested as specified in 4.6.5.1, the inductance shall be as specified (see 3.1). 3.8.2 Q of coils. When coils are tested as specified in 4.6.5.2, the Q shall be as specified (see 3.1). 3.8.3 Self-resonant frequency. When coils a
33、re tested as specified in 4.6.5.3, the self-resonant frequency shall be not less than the minimum value specified (see 3.1). 3.8.4 Percent coupling (when specified). When coils are tested as specified in 4.6.5.4 or 4.6.5.4.1, the percent coupling shall be as specified (see 3.1). 3.8.5 Incremental cu
34、rrent inductance change (when specified). When coils are tested as specified in 4.6.5.5, the inductance value shall represent a change of 5 percent or less of the inductance measures with zero direct current (dc) (see 3.1). 3.8.6 Effective parallel resistance (when specified). When coils are tested
35、as specified in 4.6.5.6 or 4.6.5.6.1, the effective parallel resistance shall be as specified (see 3.1). 3.8.7 DC resistance. When coils are tested as specified in 4.6.5.7, the dc resistance shall be as specified (see 3.1). 3.9 Temperature rise (applicable to cylindrical insulated coils and when spe
36、cified). When coils are tested as specified in 4.6.6 or 4.6.6.1, the temperature rise of any winding above the specified maximum ambient temperature (see 3.1) shall not exceed the value specified (see 3.1) and there shall be no evidence of physical damage. 3.10 Overload. When coils are tested as spe
37、cified in 4.6.7, there shall be no evidence of cracked cases, nor loosening of the terminals. 3.11 Resistance to soldering heat. When coils are tested as specified in 4.6.8, there shall be no evidence of mechanical damage, loosening of the terminals, or solder reflow as evidence by solder flowing fr
38、om the body. Pretest and posttest X-ray inspection at 10X shall be required. 3.12 Terminal strength. When coils are tested as specified in 4.6.9, there shall be no winding discontinuity, no loosening or rupturing of the terminals, nor other mechanical damage. 3.13 Life. When coils are tested as spec
39、ified in 4.6.10, there shall be no evidence of mechanical damage. The changes in electrical characteristics between the initial measurements and 250 +48, -0 hours shall not exceed the initial limits specified for phenolic and iron core coils and the electrical characteristics from the 250 +48, -0 ho
40、urs up to and including 2,000 hours shall not exceed the degradation limits specified (see 3.1). The change in electrical characteristics for ferrite core coils between the initial measurements up to and including 2,000 hours shall not exceed the degradation limits specified (see 3.1 and 6.7). 3.14
41、Low temperature storage. When coils are tested as specified in 4.6.11, there shall be no impairment of protective coating, no loosening of the windings or terminals, nor any other evidence of mechanical damage. 3.15 Vibration. When coils are tested as specified in 4.6.12.1 or 4.6.12.2, there shall b
42、e no winding discontinuity (see 3.6), nor evidence of physical or mechanical damage. 3.16 Shock (specified pulse). When coils are tested as specified in 4.6.13, there shall be no winding discontinuity (see 3.6), nor evidence of physical or mechanical damage. 3.17 Moisture resistance (grades 1 and 2
43、only). When coils are tested as specified in 4.6.14, the electrical characteristics shall be as specified in 3.8, and there shall be no evidence of corrosion affecting the mechanical or electrical operation. 3.18 Fungus. All external materials shall be nonnutrient to fungus growth or shall be suitab
44、ly treated to retard fungus growth. The manufacturer shall verify by certification that all external materials are fungus resistant or shall test the coils as specified in 4.6.15. There shall be no evidence of fungus growth on the external surfaces. Provided by IHSNot for ResaleNo reproduction or ne
45、tworking permitted without license from IHS-,-,-MIL-PRF-15305F 5 3.19 Solderability. When coils are tested as specified in 4.6.16, they shall meet the applicable criteria for termination in method 208 of MIL-STD-202 and electrical connections shall be mechanically secure before soldering and electri
46、cally continuous after soldering. 3.20 Resistance to solvents. When coils are tested as specified in 4.6.17, there shall be no evidence of mechanical damage and the markings shall remain legible. 3.21 Flammability. When coils tested as specified in 4.6.18, there shall be no evidence of violent burni
47、ng which results in an explosive-type fire, and the coating material used on the coils shall be self-extinguishing. A coil shall not be considered to have failed in the event that it is consumed by the applied flame. A coil shall be considered to have failed only if an explosion of dripping of flami
48、ng material occurs, an explosive-type flame is produced, or if visible burning continues beyond the allowable duration of 3 minutes after removal of the applied flame. 3.22 Marking (not applicable to cylindrical coils). Coils shall be permanently and legibly marked with the military part number, man
49、ufacturers source code, date code, and lot symbol as shown in the following example. The marking shall remain legible after all tests. EXAMPLE: M15305/1-001 - - - Military part number or MS75008-21 12345 - - - Manufacturers source code 6733A - - - Date code and lot symbol 3.22.1 Manufacturers source code an
