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-12934/37A 25 August 2005 SUPERSEDING MIL-PRF-12934/37 1 October 2002 PERFORMANCE SPECIFICATION RESISTORS, VARIABLE, WIREWOUND, PRECISION, STYLE 2RR3100 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 2RR3100, variable, wirewound, 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. 2RR3100 X X B X L 6650 Style (1.2.1) Function and shaft length (1.2.2) Class and center tap (1.2.3) Resistance temperature characteristic (1.2.
5、4) Rotational life characteristic (1.2.5) Function conformity tolerance and resistance tolerance characteristic (1.2.6) Resistance(1.2.7) 1.2.1 Style. Style 2RR3100 is a similar style to RR3100. 1.2.2 Function and shaft length. The function and shaft length applicable to this specification is identi
6、fied by a single symbol X (see figure 1). 1.2.3 Class and center tap. The class and center tap applicable to this specification is symbol X. 1.2.4 Resistance temperature characteristic. The resistance temperature characteristic applicable to this specification is symbol B. 1.2.5 Rotational life char
7、acteristic. The rotational life characteristic applicable to this specification is symbol X. 1.2.6 Function-conformity tolerance and resistance tolerance characteristics. The function-conformity tolerance and resistance tolerance characteristic applicable to this specification is symbol X. Provided
8、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12934/37A 21.2.7 Resistance. The nominal total resistance values and nominal resolution applicable to this specification is as follows: First cup 665 ohms (). Second cup 665 ohms (). Style Turns Maximum
9、continuous working voltage (volts) Power rating(milliwatts) Maximum starting torque Stop torque (pound-inch) First cup Second cup Starting Starting 2RR3100 single 500 0.25 6.0 6.0 2.0 NOTES: 1. Dimensions are in inches. Metric equivalents are given for general information only. FIGURE 1. Style 2RR31
10、00 Inches mm Inches mm 0.018 0.457 0.265 6.731 0.030 0.762 0.312 7.925 0.040 1.016 0.396 10.058 0.062 1.575 0.408 10.363 0.063 1.600 0.625 15.875 0.088 2.235 0.656 16.662 0.1246 3.165 0.718 18.237 0.1249 3.172 0.765 19.431 0.235 5.969 0.890 22.606 0.250 6.350 1.062 26.975 Provided by IHSNot for Resa
11、leNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12934/37A 32. 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 specifi
12、cation 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 are li
13、sted. 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 (see 6.2).
14、 DEPARTMENT OF DEFENSE SPECIFICATION MIL-PRF-12934 - Resistors, Variable, Wirewound, Precision, General Specification for. (Copies 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, Phila
15、delphia, PA 19111-5094). 2.3 Order of precedence. In the event of a conflict 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 regu
16、lations unless a specific exemption has been obtained. 3. 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 spec
17、ified in figure 1. 3.3 Electrical characteristics (for Cup A and Cup B). 3.3.1 Total resistance. The total resistance of 665 ohms 5 percent across terminals 1 and 3 throughout the temperature range from -55OC to +85OC. 3.3.1.1 Resistance value deviations. All maximum deviations as specified in this
18、section are to be considered absolute limits with the exception of the contact resistance adjustments. 3.3.2 Output load and configuration. The output load and configuration is 20,000 ohms between terminals 2 and 3. 3.3.3 Actual electrical travel. The theoretical electrical travel shall be 334 degre
19、es. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12934/37A 43.3.4 Function and conformity. The type of function applicable to this specification shall be by the given equation: when loaded with the specified load per 3.5 where: E(OUT)= Vol
20、tage from the contact arm (terminal 2) to terminal 3 = Shaft angle in degrees (measured from 0 degrees. (0 degrees is located at CW end of winding). ( = 50 degrees at index point). E(IN)= 10 V dc applied across terminals 1 and 3. Note: Counterclockwise (CCW) rotation produces an increasing E(OUT)as
21、viewed from the shaft end. 3.3.5 Index point. The index point of the ganged assembly shall be located at = 50 degrees. The magnitude of the output voltage ration (to four digits) of Cup A shall be marked on the case. Cup B shall be phased with index point for simultaneous conformity. 3.3.6 Maximum c
22、ontact arm current. The maximum contact arm current is 0.5 milliampere (ma). 3.3.7 Continuous working group voltage. The continuous working voltage is 10 Vdc. 3.4 Mechanical characteristics. 3.4.1 Mechanical travel. The mechanical travel shall exceed 334 degrees. 3.4.2 Torque. 3.4.2.1 Starting. The
23、staring torque shall be a minimum of 2 inch-ounces (in-oz) and a maximum of 6 in-oz. 3.4.2.2 Stop. The mechanical stop shall withstand a stop torque of 2.0 inch-pounds (in-lb). 3.4.3 Shaft runout. The shaft runout shall be 0.0035 inch maximum. 3.4.4 Shaft radial play. The shaft radial play shall be
24、0.002 inch maximum. 3.4.5 Shaft end play. The shaft end play shall be 0.005 inch maximum. 3.4.6 Rotation Speed. The maximum shaft rotation in 5 rotations per minute (rpm). 3.4.7 Moment of Inertia. The maximum moment of inertia is 40 gm-cm2(ref). 3.4.8 Rotational load life. The resistor shall meet th
25、e requirements per MIL-PRF-12934 for 5,000 cycles. At the end and during cycling the resistor shall meet all the requirements of this specification. 3.5 Environmental characteristics. 3.5.1 High temperature exposure. In accordance with MIL-PRF-12934 class 2. 3.5.2 Temperature cycling. In accordance
26、with MIL-PRF-12934, for class 2 except -55OC for low temperatures. 3.5.3 Shock. In accordance with MIL-PRF-12934, except resistors shall be checked for discontinuity during shock and performance after shock only. )33490(SIN*EE )IN()OUT( Provided by IHSNot for ResaleNo reproduction or networking perm
27、itted without license from IHS-,-,-MIL-PRF-12934/37A 53.6 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 alloyed with a minimum of 3 percent
28、 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. 4.2 Extension of qualification. Manufacturers who have passed the qualification requirements, and have been approved and listed on or approved for lis
29、ting on the qualified products list (QPL), for style RR3100, will be approved for style 2RR3100. 5. PACKAGING. 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-hous
30、e 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 activity within the Military Service or Defense Agency, or within the military services syst
31、em 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. NOTES (This section contains information of general or explanatory nature that may be helpf
32、ul, 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. Title, number, and date of this specification, and the complete PIN (see 1.2). b. If n
33、ot 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 specification requires a PIN that describes technology and appropriate references to associat
34、ed documents (see 1.2 and 3.1). 6.4 Tin 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 conditi
35、ons, on products that use such materials. 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
36、(Standard Specification for Electrodeposited Coatings of Tin). 6.5 Changes from previous issue. 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 wh
37、atsoever for any inaccuracies in these notations. 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. Provided by IHSNot for ResaleNo reproduction or networ
38、king permitted without license from IHS-,-,-MIL-PRF-12934/37A 6Custodians: Preparing activity: Navy - EC DLA - CC DLA - CC (Project 5905-2008-034) 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-,-,-
