1、Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus, ATTN: DSCC VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or by email 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-12934/18E 25 August 2009 SUPERSEDING MIL-PRf-12934/18D 1 February 1999 PERFORMANCE SPECIFICATION RESISTORS, VARIABLE, WIREWOUND, PRECISION, STYLE RR3500 This specification is approved for use by
3、 all Departments and Agencies of the Department of Defense. The requirements for acquiring the product described herein shall consist of this specification sheet and MIL-PRF-12934. 1. SCOPE 1.1 Scope. This specification covers the requirements for style RR3500, variable, wire-wound, precision resist
4、ors. 1.2 Part or Identifying Number (PIN). Variable resistors covered by this specification must be identified by a PIN which must be in the following form. Single-section (cup) resistors RR3500 A 2 A 7 J 103 Style Function and shaft length (1.2.1) Class and center tap (1.2.2) Resistance temperature
5、 characteristic (1.2.3) Rotational life characteristic (1.2.4) Function conformity tolerance and resistance tolerance characteristic (1.2.5) Resistance (1.2.6) 1.2.1 Function and shaft length. The function and shaft length applicable to this specification is identified by a single symbol in accordan
6、ce with table I. TABLE I. Function and shaft length. Symbol Shaft length tolerance 0.03125 (.79) 1/ Function A 0.750 (19.05) Linear B 0.875 (22.23) Linear C 1.000 (25.40) Linear D 1.125 (28.58) Linear E 1.250 (31.75) Linear F 1.375 (34.93) Linear 1/ Metric equivalents are in parentheses. Provided by
7、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12934/18E 21.2.2 Class and center tap. The class and center tap applicable to this specification are symbols 2, 3, 4, and 5. 1.2.3 Resistance temperature characteristic. The resistance temperature characte
8、ristic applicable to this specification are symbols A to H, inclusive. 1.2.4 Rotational life characteristic. The rotational life characteristics applicable to this specification are symbols 7, 8, and 9. This potentiometer is capable of operations up to 100 rpm. 1.2.5 Function-conformity tolerance an
9、d resistance tolerance characteristics. The function-conformity tolerance and resistance tolerance characteristic applicable to this specification are symbols A to X, Inclusive. 1.2.6 Resistance. The nominal total resistance values and nominal resolution applicable to this specification is in accord
10、ance with table II. TABLE II. Nominal total resistance and nominal resolution characteristics. Nominal total resistance value Nominal resolution Ohms Percent 200 0.140500 0.100 1,000 0.0802,000 0.065 5,000 0.05010,000 0.040 20,000 0.03550,000 0.027 .1 megohm 0.025 2. APPLICABLE DOCUMENTS 2.1 General
11、. 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 additional information or as examples. While every effort has been made to ensure the completeness
12、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 are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and
13、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 (see 6.2). DEPARTMENT OF DEFENSE SPECIFICATION MIL-PRF-12934 - Resistors, Variable, Wirewound, Precision, General Specification for. (C
14、opies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094). 2.3 Order of precedence. In the event of a conflict between the text of this document and the refere
15、nces 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. Provided by IHSNot for ResaleNo reproduction or networking permitted w
16、ithout license from IHS-,-,-MIL-PRF-12934/18E 33. REQUIREMENTS 3.1 General. The requirements for acquiring the product described herein shall consist of this document and MIL-PRF-12934. 3.2 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified in
17、 figure 1. Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm .005 0.13 .050 1.27 .100 2.54 .375 9.53 1.000 25.40 3.031 76.99 .010 0.25 .060 1.52 .125 3.18 .406 10.31 1.156 29.36 3.250 82.55 .020 0.51 .062 1.57 .250 6.35 .875 22.23 1.750 44.45 Style Turns Maximum continuous working voltage
18、(volts) Power rating (watts) 1/ Maximum starting and running torque (ounce-inch) Single-turn, single cup Per additional single-turn cup Starting Running Starting Running RR3500 Single 250 6.0 1.5 1.0 1.0 .8 1/ When single turn units are ganged, the first cup will be full wattage rating, the remainin
19、g cups will be 75 percent of rated wattage. NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. FIGURE 1. Style RR3500 90 MAXProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12934/18E 43.3 Minimum
20、total resistance. The minimum total resistance value shall be 20 ohms. 3.4 Maximum total resistance. The maximum total resistance value shall be 0.1 megohms. 3.5 Mechanical travel. The mechanical travel shall be 360 degrees 3.6 Actual electrical travel. The theoretical electrical travel shall be 350
21、 degrees 2 degrees. 3.7 Ganged cups. There shall be no more than 3 cups ganged. 3.8 Phasing. For independent linearity the phasing between the cups shall be within 1 degree. This shall be measured, with respect to the first cup, starting from the counterclockwise end point. 3.9 Function. The type of
22、 function applicable to this specification shall be independent linearity. 3.10 Weight. The maximum weight shall be 0.5 pounds and each additional cup shall be 0.19 pounds. 3.11 Hardware. The mounting nut shall be 0.094 inch thick and shall measure 0.500 inch across the hexagonal flats. Thread size
23、shall be 0.375-32NEF-2B. Internal-tooth lockwasher of suitable size shall be supplied. 3.12 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 shall not exceed 97 percent, by mass. Tin shall be a
24、lloyed with a minimum of 3 percent lead, by mass (see 6.4). 4. VERIFICATIONS. 4.1 Sampling and inspection. Sampling and inspection procedures shall be in accordance with MIL-PRF-12934. 5. PACKAGING. 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the cont
25、ract 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 Points packaging acti
26、vity 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 packaging activity. 6. NOT
27、ES (This section contains information of general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. The intended use specified in MIL-PRF-12934 will be applicable to this specification. 6.2 Acquisition requirements. Acquisition documents must specify the following: a
28、. Title, number, and date of this specification, and the complete PIN (see 1.2). b. Unless 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 PIN. This speci
29、fication requires a PIN that describes technology and appropriate references to associated documents (see 1.2 and 3.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12934/18E 56.4 Tin whisker growth. The use of alloys with tin content grea
30、ter 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 materials. Conformal coatings applied over top of a whisker-pron
31、e 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 Electrodeposited Coatings of Tin). 6.5 Changes from previous issue.
32、 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 notations. Bidders and contractors are cautioned to eval
33、uate 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 Review activities (Project 5905-2009-027) Army - AR, AT, AV, CR4, MI Navy
34、 - 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-,-,-
