1、 REVISIONS LTR DESCRIPTION DATE APPROVED Prepared in accordance with ASME Y14.100 Selected item drawing REV STATUS OF PAGES REV PAGES 1 2 3 4 5 6 7 8 9 10 11 12 PMIC N/A PREPARED BY Jesus V. Garcia III DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OH 3 October 2002 CHECKED BY Andrew Ernst APPROVED BY Ke
2、ndall A. Cottongim TITLE RESISTORS, VARIABLE, NONWIRE WOUND (ADJUSTMENT TYPE, LEAD-SCREW ACTUATED) 1/2“ RECTANGULAR, 0.3 WATTS SIZE A CODE IDENT. NO. 037Z3 DWG NO. 02005 REV PAGE 1 OF 12 AMSC N/A 5905-E407 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.Provided by I
3、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. SCOPE 1.1 Scope. This drawing describes the requirements for a 0.3 Watt, lead screw actuated, nonwire wound variable resistor. 1.2 Part or Identifying Number (PIN). The complete PIN is as follows: 02005 - XXX Dra
4、wing number Resistance 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 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 t
5、hose listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). STANDARDS DEPARTMENT OF DEFENSE MIL-STD-202 - Test Method Standard Electronic and Electrical Component Parts MIL-STD-1285 - Marking of Ele
6、ctrical and Electronic Parts (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Document Automation and Production Service, Building 4D (DPM-DODSSP), 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.2 Order of precedence. In
7、 the event of a conflict between the text of this document and the references cited herein, 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 Item Requirements.
8、The individual item requirements shall be as specified herein. 3.2 Interface and physical dimensions. The resistor shall meet the interface and physical dimensions as specified herein (see figure 1). 3.3 Electrical characteristics. 3.3.1 Resistance. The nominal resistance expressed in ohms is identi
9、fied by a three-digit number; the first two digits represent significant figures and the last digit specifies the number of zeros to follow. When resistance values less than 10 ohms are required, the letter “R“ is substituted for one of the significant digits to represent the decimal point. The resi
10、stance may be of any value, but it is preferred that the standard values be chosen from table I. DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 037Z3 DWG NO. 02005 REV PAGE 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Inche
11、s mm Inches mm Inches mm .001 0.0254 .040 1.016 .150 3.810.010 0.254 .055 1.397 .240 6.100 .015 0.381 .075 1.905 .400 10.160 .016 0.406 .100 2.540 .500 12.700.025 0.635 .108 2.743 NOTE: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. The picturization of
12、 the resistor above is a given representative of the envelope of the item. Slight deviations from the outline shown (which are contained within the envelope, and do not alter the functional aspects of the device) are acceptable. FIGURE 1. Resistor variable nonwire wound. DEFENSE SUPPLY CENTER, COLUM
13、BUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 037Z3 DWG NO. 02005 REV PAGE 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3.1.1 Resistance range. The resistance values are as specified in table I. Table I. Resistance values. Resistance code Resistanc
14、e Resistance code Resistance 100 10 502 5,000 200 20 103 10,000 500 50 203 20,000 101 100 503 50,000 201 200 104 100,000 501 500 204 200,000 102 1,000 504 500,000 202 2,000 3.3.2 Resistance tolerance. The resistance tolerance shall be 10 percent. 3.3.3 Power rating. The power rating shall be 0.3 wat
15、ts at 85C, derated to zero at 150C. 3.3.4 Operating temperature. The operating temperature shall be -65C to +150C. 3.4 Resistance temperature characteristic. The resistance temperature characteristic shall be 100 ppm/C. 3.5 Conditioning. When resistors are tested as specified in 4.4, there shall be
16、no mechanical damage. The change in total resistance shall not exceed 2 percent. 3.6 Contact resistance variation. When measured as specified in 4.5, the contact resistance variation shall not exceed 3 percent or 3 ohms, which ever is greater. 3.7 DC resistance. 3.7.1 Total resistance. When measured
17、 as specified in 4.6.1, the total direct current (dc) resistance shall not deviate from the specified nominal resistance (see 3.1), by more than 10 percent. 3.7.2 End resistance. When measured as specified in 4.6.2, the end resistance for all characteristics shall not exceed 2 ohms or 2 percent of t
18、he total resistance, which ever is greater. 3.8 Immersion. When resistors are tested as specified in 4.7, no continuous stream of bubbles shall emanate from any concentrated point of the resistor. When resistors are subjected to the dye penetrant test, there shall be no evidence of dye in the intern
19、al cavities. 3.9 Actual effective electrical travel. When resistors are tested as specified in 4.8, the number of turns of the operating shaft necessary for the contact arm to traverse the resistance element shall be as specified (see 3.1). 3.10 Dielectric withstanding voltage. When resistors are te
20、sted as specified in 4.9, there shall be no evidence of damage, arcing, or breakdown. The leakage current shall not exceed one milliampere. 3.11 Insulation resistance. When resistors are tested as specified in 4.10, the dry insulation resistance shall not be less than 1,000 megohms. DEFENSE SUPPLY C
21、ENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 037Z3 DWG NO. 02005 REV PAGE 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.12 Torque. 3.12.1 Operating. When resistors are tested as specified in 4.11.1, the minimum torque required to move t
22、he contact arm shall be 0.05 ounce-inch and the maximum torque required shall be as specified (see 3.1). 3.12.2 Clutch. When resistors are tested as specified in 4.11.2, the contact arm shall idle against the stop without electrical discontinuity or evidence of mechanical damage. The travel of the c
23、ontact arm shall also be capable of reversing direction. 3.13 Thermal shock. When resistors are tested as specified in 4.12, the change in total resistance shall not exceed 1 percent. The change in setting stability shall not exceed 1 percent. There shall be no electrical discontinuity or evidence o
24、f mechanical damage. 3.14 Solderability. When resistors are tested as specified in 4.13, they shall meet the criteria for wire-lead terminal evaluation in the test method. 3.15 Marking. Resistors shall be in accordance with MIL-STD-1285, except the resistors shall be marked with the PIN assigned her
25、ein, (see 1.2), manufacturers identification (Commercial And Government Entity (CAGE) or logo), and date and lot codes. 3.16 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provid
26、ed the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.17 Certificate of compliance. A certificate of compliance shall be required from manufacturers requesting to be a suggested source of supply. 3.18 Workmanship. Re
27、sistors shall be processed in such a manner as to be uniform in quality and parts shall be free from any defects that will affect life, serviceability, or appearance. 4. VERIFICATION 4.1 Qualification inspection. Qualification inspection is not applicable to this document. 4.2 Conformance inspection
28、. 4.2.1 Inspection of product for delivery. Inspection of product for delivery shall consist of the group A inspections. 4.2.1.1 Group A inspection. Group A inspection shall consist of the inspections specified in table II, and shall be made on the same set of sample units, in the order shown. DEFEN
29、SE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 037Z3 DWG NO. 02005 REV PAGE 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table II. Group A inspection. Inspection Requirement paragraph Test method paragraph Sampling procedure Sub
30、group 1 1/ 2/ Conditioning Contact resistance variation Total resistance 3/ Immersion 3.5 3.6 3.7.1 3.8 4.4 4.5 4.6.1 4.7 100 percent inspection Subgroup 2 4/ 5/ End resistance Actual effective electrical travel Dielectric withstanding voltage Insulation resistance Torque Thermal shock 3.7.2 3.9 3.1
31、0 3.11 3.12 3.13 4.6.2 4.8 4.9 4.10 4.11 4.12 4.3.2 Subgroup 3 4/ 6/ Solderability 3.14 4.13 4.3.3 1/ 100 percent solder dip may be performed prior to immersion. 2/ At the manufacturers option, the determination of resistance change may be by any method which is within the accuracy requirements of t
32、his specification. 3/ Resistors shall meet this specified initial resistance tolerance. The resistance measurement made upon completion of the power conditioning test may be used if a measurement was made which can, without conversion, be directly related to nominal resistance value and tolerance. 4
33、/ At the option of the manufacturer, subgroup 2, and subgroup 3 may be performed concurrently with a separate set of samples. 5/ If the manufacturer can demonstrate that this test has been performed for 6 months with zero failures, the frequency of this test, with the approval of the qualifying acti
34、vity, can be performed on an annual basis. If the design, material, construction, or processing of the part is changed, or if there are any quality problems or failures, the qualifying activity may require resumption of the original test frequency. 6/ The manufacturer may request the deletion of the
35、 subgroup 3 solderability test, provided an in-line or process control system for assessing and assuring the solderability of leads can be validated and approved by the qualifying activity. Deletion of the test does not relieve the manufacturer from meeting this test requirement in case of dispute.
36、If the design, material, construction, or processing of the part is changed or if there are any quality problems, the qualifying activity may require resumption of the test. 4.3.1 Subgroup 1 Subgroup 1 tests shall be performed on 100 percent of the product supplied under this specification. Resistor
37、s that are out of resistance tolerance or which experience a change in resistance greater than that permitted for the tests of this subgroup shall be removed from the lot. Lots having more than 5 percent total rejects or one resistor, whichever is greater, due to exceeding the specified resistance c
38、hange limit, shall not be furnished on the contract. 4.3.2 Subgroup 2. A sample of parts in accordance with table III shall be randomly selected, if one or more defects are found, the lot shall be rescreened and defects removed. A new sample of parts shall then be randomly selected. If one or more d
39、efects are found in this second sample, the lot shall be rejected and shall not be supplied against this document. DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 037Z3 DWG NO. 02005 REV PAGE 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
40、from IHS-,-,-TABLE III. Group A sampling plan. Lot size Sample size 1 to 8 100 percent 9 to 150 13 151 to 280 20 281 to 500 29 501 to 1,200 34 1,201 to 3,200 42 3,201 to 10,000 50 10,001 to 35,000 60 35,001 to 150,000 74 150,001 to 500,000 90 500,001 and over 102 4.3.3 Subgroup 3 (solderability). A
41、sample of parts in accordance with table III shall be randomly selected, as an option, the manufacturer may use electrical rejects from subgroup I test for all or part of the sample. If there are one or more defects, the lot is rejected. The manufacturer may use the following for corrective action:
42、a. Each lot that was used to form the failed lot shall be individually submitted to the solderability test. Lots that pass the solderability test are available for shipment. b. The failed lot is submitted to a 100 percent hot solder dip. A subsequent solderability test shall then be performed. If th
43、e lot passes, it is available for shipment; if the lot fails, the manufacturer may perform the hot solder dip one additional time. If the lot fails, the lot is considered rejected and shall not be supplied to this drawing. 4.3.3.1 Disposition of samples. The solderability test is considered a destru
44、ctive test and samples submitted to the solderability test shall not be supplied on the contract. 4.4 Conditioning (see 3.5). Resistors shall be conditioned in accordance with method 108 of MIL-STD-202. The following details and exceptions shall apply: a. Method of mounting: Supported by their termi
45、nals (resistors not mounted on life test chassis). Resistors shall be so arranged that the temperature of any one resistor shall not appreciably influence the temperature of any other resistor. There shall be no circulation of air over the resistors other than that caused by the heat of the resistor
46、s. b. Temperature and tolerance: 25C, +10C, -5C. c. Initial measurements: Initial total resistance shall be measured at 25C, +10C, -5C after mounting as specified in 4.8.5.1. This initial measurement shall be used as the reference temperature for all subsequent measurements. d. Operating condition:
47、DC continuous working voltage or a continuous working voltage from an ac supply at commercial line frequency and waveform equivalent to 1.5 times the specified wattage (see 3.1), shall be applied between the end terminals intermittently 1.5 hours “on“ and 0.5 hour “off“ for a minimum of 50 hours +8
48、hours, -0 hours, at a temperature of 25C, +10C, -5C. Each resistor shall dissipate 1.5 times the rated wattage, but not to exceed the maximum voltage specified for each style (see 3.1). e. Measurement after conditioning: Total resistance shall be measured at the end of the 50 hours +8 hours, -0 hour
49、s as specified in 4.8.5.1 after load has been removed and the resistors stabilized. f. Examination after conditioning: Resistors shall be examined for evidence of mechanical damage. g. Test duration: 50 hours +8 hours, -0 hours. DEFENSE SUPPLY CENTER, COLUMBUS COLUMBUS, OHIO SIZE A CODE IDENT NO. 037Z3 DWG NO. 02005 REV PAGE 7 Provided by IH
