1、Comments, suggestions, or questions on this document should be addressed to Defense Supply Center, Columbus, ATTN: DSCC/VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to Resistordla.mil. Since contact information can change, you may want to verify the currency of this address informa
2、tion using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 5905 INCH-POUND MIL-PRF-94/4L w/Amendment 1 9 June 2008 SUPERSEDING MIL-PRF-94/4L 2 June 2006 PERFORMANCE SPECIFICATION SHEET RESISTORS, VARIABLE, COMPOSITION, STYLE RV2 This specification is approved for use by all Dep
3、artments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for style RV2 composition, variable resistors. 1.2 Part or Identifying Number (PIN). Resistors covered by this specification are identified by a PIN which is in the following form. RV2
4、NAYSD101A Style Coded dash number The coded dash number is derived in accordance with MIL-PRF-94 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
5、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 documents cited in sections 3 and 4 of this specification, whether or not they
6、 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 documents are those cited in the solicitation (se
7、e 6.2). DEPARTMENT OF DEFENSE SPECIFICATION MIL-PRF-94 - Resistor, Variable, Composition, General Specification for. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Ave
8、nue, Building 4D, Philadelphia, PA 19111-5094). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-94/4L w/Amendment 1 22.3 Order of precedence. In event of a conflict between the text of this document and the references cited herein (except for
9、 related associated specifications, specification sheets, or MS 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 3.1 General. The requirements for acquirin
10、g the product described herein shall consist of this document and MIL-PRF-94. 3.2 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified in figure 1. 3.3 Nominal total resistance and rated continuous working voltages. The nominal total resistance
11、and rated continuous working voltage (RCWV) shall be as specified in table I. TABLE I. Nominal total resistance and rated continuous working voltage. Nominal total resistance (in ohms) RCWV 1/ (volts) Nominal total resistance (in megohms) RCWV 1/ (volts) Taper A Tapers C and F Taper A Tapers C and F
12、 100 150 200 250 350 500 750 1,000 1,500 2,000 2,500 3,500 5,000 7,500 10,000 15,000 20,000 25,000 35,000 50,000 75,000 2/ 2/ 2/ 10 12 14 16 19 22 27 32 39 44 50 59 71 87 100 123 140 158 187 224 274 7 9 10 11 13 16 19 24 27 31 35 42 50 62 71 87 100 112 132 158 194 0.10 0.15 0.20 0.25 0.35 0.50 0.75
13、1.00 1.50 2.00 2.50 2/ 316 350 350 350 350 350 350 350 350 350 350 200 200 200 200 200 200 200 200 200 200 200 1/ Rated for continuous working voltage at 70OC. 2/ For replacement purposes only. Not for new design. 3.3.1 Resistance value deviations. All maximum deviations as specified in this section
14、 are to be considered absolute limits with the exception of the contact resistance adjustments. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-94/4L w/Amendment 1 3Inches mm Inches mm Inches mm Inches mm Inches mm .001 0.03 .031 0.79 .078 1.
15、98 .250 6.35 .797 20.24 .002 0.05 .037 0.94 .085 2.16 .375 9.53 .813 20.65 .005 0.13 .040 1.02 .094 2.39 .438 11.13 .906 23.01 .010 0.25 .047 1.19 .109 2.77 .453 11.51 1.000 25.40 .015 0.38 .050 1.27 .125 3.18 .500 12.70 1.047 26.59 .016 0.41 .062 1.57 .172 4.37 .625 15.88 .020 0.51 .063 1.60 .216 5
16、.49 .750 19.05 NOTES: 1. Dimensions are in inches. Metric equivalents are given for general information. 2. Unless otherwise specified, tolerance is 0.062 inch (1.57mm). FIGURE 1. Style RV2. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-94/
17、4L w/Amendment 1 43.4 Shaft length. The length of the operating shaft shall be in accordance with table II. TABLE II Shaft length. 1/ Symbol Length of shafts from mounting surface of resistors, (nominal) Flatted Slotted Bushings N and S (inches 0.313) Bushings N and S (inches 0.313) Bushings L and T
18、 (inches 0.313) A B D G J K 0.875 0.500 0.875 1.250 2.000 2.500 0.625 0.875 1/ For resistors with panel seals, the mounting surface shall be considered the metal face of the panel seal when the seal is firmly seated against the resistor body. 3.5 Mounting and locking nuts. The mounting nut shall be
19、0.093 inches thick and measure 0.500 inches across the hexagonal flats. The locking nut shall be within the limits 0.151 inches and 0.234 inches thick and shall measure 0.500 inches across the hexagonal flats. The thread size shall be 0.375-32 NEF-2B. 3.5.1 Internal tooth lockwasher. Internal tooth
20、lockwasher of suitable size shall be applied. 3.5.2 Retainer rings. If retainer rings are used, they shall have a maximum thickness of 0.047 inches. 3.6 Power rating. The power rating shall be 1.0 watts for taper A resistors and 0.5 watts for taper C and F. 3.7 Torque. 3.7.1 Operating torque. The to
21、rque required to effect rotation shall be 1 ounce-inch minimum and 6 ounce-inch maximum. 3.7.2 Stop torque. The torque applied to the operating shaft to the stops shall be 8 pound-inch. 3.7.3 Locking torque (as applicable). For the locking bushing type resistors, the locking nut shall be tightened w
22、ith a torque of 10 pound-inches. After the locking nut is tightened, the contact arm shall not move when a torque of 30 ounce-inches is applied to the shaft. 3.8 Total mechanical rotation. The total mechanical rotation with a switch shall be within the limits of 266 degrees and 338 degrees; without
23、a switch, within the limits of 251 degrees and 318 degrees. 3.9 Thermal cycling. The resistance shall not change in excess of 6 percent. 3.10 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of resistor components and solder s
24、hall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3). 4. VERIFICATION 4.1 Sampling and inspection. Sampling and inspection shall be in accordance with MIL-PRF-94. 4.2 Dielectric withstanding voltage. In the dielectric withstanding voltage test
25、, the applied potential shall be 450 volts rms at reduced barometric pressure. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-94/4L w/Amendment 1 55. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as s
26、pecified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are maintained by the Inventory Control P
27、oints packaging activity within the Military Service or Defense Agency, or within the military services system commands. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automated packaging files, CD-ROM products, or by contacting the responsible packag
28、ing activity. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. The intended use specified in MIL-PRF-94 is applicable to this specification. 6.2 Acquisition requirements. Acquisition documents must specify th
29、e following: a. Title, number, and date of this specification, and the complete PIN (see 1.2). b. If not otherwise specified (see 2.1), the versions of the individual documents referenced will be those in effect on the date of release of the solicitation. c. Packaging instructions (see 5.1). 6.3 Tin
30、 whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture and can develop under typical operating conditions, on products that use such material
31、s. Conformal coatings applied over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-B545 (Standard Specification for Electrodepo
32、sited Coatings of Tin). 6.4 Amendment notification. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notat
33、ions. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 85 DLA - CC Review activi
34、ties (Project 5905-2008-048) Army - AR, AT, AV, CR4, MI Navy - AS, CG, MC, OS Air Force - 19, 99 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
