DLA MIL-PRF-29 C-2010 RESISTORS FIXED METER MULTIPLIER EXTERNAL (HIGH VOLTAGE FERRULE TERMINAL TYPE).pdf
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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 https:/assist.daps.dla.mil/ AMSC N/A FSC 5905 INCH-POUND MIL-PRF-29C 5 February 2010 SUPERSEDING MIL-PRF-29B 30 November 1998 PERFORMANCE SPECIFICATION RESISTORS, FIXED, METER MULTIPLIER, EXTERNAL (HIGH VOLTAGE, FERRULE TERMINAL TYPE) This specification is ap
3、proved by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for high-voltage, external, meter-multiplier, fixed resistors of the ferrule-terminal type for use with direct-current (dc) instruments drawing 1 milliampere at full-sc
4、ale deflection. Designers are CAUTIONED on using these resistors in pulse applications (see 6.5). 1.2 Classification. 1.2.1 Part or Identifying Number (PIN). The PIN must be in the following form and as specified (see 3.1). MFC 504 Style (1.2.1.1) Resistance (1.2.1.2) 1.2.1.1 Style. The style is ide
5、ntified by a three-letter symbol. The first two letters, MF, identify high voltage, external, meter-multiplier, fixed resistors of the ferrule-terminal type. The third letter identifies the particular physical dimensions. 1.2.1.2 Resistance. The nominal resistance in ohms is designated by a three-di
6、git number. The first two digits represent the first two significant figures of the figures of the resistance value, the third digit indicates the number of zeros to follow. 1.2.1.2.1 Resistance range. Resistors have a resistance range of 0.5 ohm to 20 megohms. 1.2.1.2.2 Nominal resistance and rated
7、 voltage. Nominal resistance and rated voltages are as specified in table I. TABLE I. Nominal resistance and rated voltage. Type designation Nominal resistance in megohms Rated voltage in kilovolts Type designation Nominal resistance in megohms Rated voltage in kilovolts MFC504 0.5 0.5 MFB355 3.5 3.
8、5 MFC804 0.8 0.8 MFA355 3.5 3.5 MFC105 1.0 1.0 MFA405 4.0 4.0 MFB105 1.0 1.0 MFA505 5.0 5.0 MFB155 1.5 1.5 MFA605 6.0 6.0 MFB205 2.0 2.0 MFD106 10.0 10.0 MFB255 2.5 2.5 MFE156 15.0 15.0 MFB305 3.0 3.0 MFF206 20.0 20.0 Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
9、se from IHS-,-,-MIL-PRF-29C 2 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 specification or recommended for additional information or as examp
10、les. 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 listed. 2.2 Government documents. 2.2.1 Specifications, standa
11、rds, 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 or contract (see 6.2). DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - T
12、est Methods Standard Electronics and Electrical Components Parts. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Ph
13、iladelphia, PA 19111-5094). 2.3 Order of precedence. Unless otherwise noted herein or in the contract, 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 unless otherwise n
14、oted. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Requirements for individual resistor types. Requirements or exceptions applicable to individual resistor types are specified on FIGURE 1 (see 6.2). 3
15、.2 Qualification. Resistors furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list (QPL) before contract award (see 4.4 and 6.3). 3.3 Materials. Materials shall be used which will enable the resistors
16、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 finished product. 3.3.1 Fume-emitting material. Material that emits deleterious or toxic fumes at a temperature of 110OC or low
17、er shall not be used. 3.3.2 Ferrous material. Ferrous material shall not be used for current-carrying parts. 3.3.3 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,
18、by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.4). 3.4 Interface and physical dimension requirements. Resistors shall meet the interface and physical dimensions specified herein. Resistors shall consist of a resistance element or series of elements of the wirewound or
19、 film type. 3.4.1 Protective coating or enclosure. The resistor assemblies shall be protected by a coating or enclosure of insulating and moisture-resistant material which shall completely cover the exterior of the resistance element, including connections between any two elements or between any ele
20、ment and a terminal ferrule. This material shall afford adequate protection against the effects of prolonged exposure to high humidity. The protective coating or enclosure shall be such as to minimize the establishment of leakage paths between terminals, resulting from collection of moisture film on
21、 the exterior surface of the resistor. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-29C 3 Style Dimensions A max. B .031 C .015 (dia) D .015 (dia) E (dia) F Min. Max. MFA 8.687 9.781 1.140 1.390 .812 1.312 .515 .015 MFB 4.187 5.281 MFD 13.
22、5 16.5 1.156 1.5 +0.010 -0.000 MFE 20.5 23.5 MFF 27.5 30.5 Resistor styles: MFA, MFB, MFD, MFE, and MFF.Resistor styles MFC. Style Dimensions A max. B .031 C .015 (dia) D E .015 (dia) F (dia) G H Min. Max. MFC 1.781 2.937 .812 .937 1.0 .687 1.078 .515 .015 .437 NOTES: 1. All dimensions are in inches
23、. 2. These resistors should be supported by ferrule-terminals only. FIGURE 1. Fixed Resistor. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-29C 4 3.4.2 Resistance elements. 3.4.2.1 Wirewound. Each resistance element shall be wound on a suit
24、able form with resistance wire. The design of the winding shall be such as to preclude shorting of turns or arcing between turns under the potential imposed between any adjacent turns. 3.4.2.1.1 Resistance wire. The resistance wire shall posses a substantially uniform cross section of conductor and
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