1、 MIL-DTL-bZ738A m 9999906 2060322 047 m I INCH-POUNDI 23 Januq 1998 SUPERSEDING 16 March 1992 MIL-DTL-62738A(AT) MIL-P-6273 8(AT) DETAIL SPECIFICATION PRINTED WIRING ASSEMBLY, IGNITION INTERRUPT DRIVER This specification is approved for use by the U. S. Army Tank-automotive and Armaments Command, De
2、partment of the Army, and is available for use by ali Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers an Ignition Interrupt Driver Printed Wiring Assembly referred to herein as the PWA. This is one of six printed wiring assemblies which comprise t
3、he Simplified Test Equipmenthternal Combustion Engine-Reprogrammable (STEKE-R) Vehicle Test Meter (VTM) (see Drawing 12259265). 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 c
4、ited in other sections of this 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 requirement documents cited in sections 3 and 4 of this spec
5、ification, whether or not they are listed. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U. S. Army Tank-automotive and Armaments Command, ATTN: AMSTA-TR-EBLUE, Warren, MI 48397-5000, by using
6、 the Standardization Document Improvement Proposal D Form 1426) appearing at the end of this document, or by letter. AMSC NIA FSC 5998 DISTRIBUTION STATEMENT A. Approved for public release; distribution is dited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
7、om IHS-,-,-MIL-DTL-6273 8A(AT) 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 listed in t
8、he 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-8 1 O - Environmental Test Methods and Engineering Guidelines (see 4.2.1). (uniess otherwise indicated, copies of
9、the above specifications, standards, and handbooks are available fi-om the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094.) 2.2.2 Other Government documents. drawings. and publications. The following other Government documents, drawings, and public
10、ations form a part of this document to the extent specified herein, Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS ARMY 12258887 - Printed Wiring Assembly, Ignition Intermpt. (Copies of these drawings are available fiom the U.S. Army Tank-automotive and Armament
11、s Command, AT“: AMSTA-TR-E/BLUE, Warren, MI 48397-5000.) 2.3 Non-Government publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specied, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cit
12、ed in the soli E7 shall be at 5 0.1 Vdc; E6 shall be at 24 Vdc; input signals shall be applied at El with respect to E2 or at E10 with respect to El 1. An 18 +1.8 kilohms (kohm) pull-up resistor shall be connected from E4 to 8.0 9.4 Vdc. 3.3.4 Input peak limiting. A signal with source impedance of 1
13、00 510 ohms and peaks of 1000 2100 V shall be limited to less than 400 V peaks when applied at El with respect to E2. 3.3.5 Points voltape output simal. When 50 +17% duty cycle square wave with a source impedance of 10 21 ohms and amplitude from zero to the same voltage as that at E6 is applied at E
14、l with respect to E2, the signal at E3 with respect to E2 shall be a positive square wave with amplitude of 6.8 k0.6 V. 3.3.6 Ignition signal output. When a square wave of amplitude from zero to the same voltage as the voltage at E6 is applied at El with the respect to E2, the signai at E4 with resp
15、ect to E5 shall have the same frequency as the input signal. The rising edge of the signai at E4 shall be between 130 and 800 microseconds (ps) environment reauirements. The PWA shall operate under the following environmental conditions, without degradation in performance: 3.6.1 Temperature. 3.6.1.1
16、 High temperahire (operating). The PWA shali be capable of operation Without damage or malfunction at a high temperature of 125 degrees Fahrenheit (OF) (52 degrees Celsius (“C) (without solar radiation). 3.6.1.2 Low temperature (operating). The PWA shall be capable of operation Without damage or mal
17、function at a low temperature of 20F (-7OC). For ambient temperatures below 20F, the test set shall be operated in a shelter. 3.6.1.3 High - tempew(nonooeratinr&. The PWA shall be capable of being stored and transported in its case without damage at an ambient temperature of +160F (+7loC). 3.6.1.4 L
18、ow temperature (nonoperating). The PWA shall be capable of being stored and transported in its case without damage in ambient temperatures of -60F (-51OC). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-b2738A m Ob 2060327 629 m MIL-DTL-62
19、73 8A(AT) 3.6.2 Fungus. Au nonmetallic materials that are not inherently fiingistatic shall function in a fungus environment without adversely affecting the operatiodperformance of the PWA. 3.6.3 Shock. The PWA shall evidence no degradation of function and meet the requirements of 3.3 when subjected
20、 to the shock test. 3.6.4 Vibration. The PWA shall evidence no degradation of function and meet the requirements of 3.3 when subjected to the vibration test. 3.6.5 Bum-in. Unless otherwise specified (see 6.2), the PWA shall be subjected to and pass a “power on” burn-in prior to the inspections liste
21、d in 4.1. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.1.1). b. Conformance inspection (CI) (see 4.1.2). 4.1.1 First article inspection. Unless otherwise specified (see 6.2), the Governme
22、nt shall select one PWA produced under the production contract for first article inspection. First article sample shal include all the verifications listed in table II. 4.1.2 CI 100% inspection. CI shall be conducted on all items (lO? inspection), and shall include those examinations and tests from
23、table II as specified in the contract. 4.2 Verification methods. Acceptable verification methods included in this section are visual inspection, and measurement, sample tests, full-scale demonstration tests, simulation, - modeling, engineering evaluation, component properties analysis, and similarit
24、y to previously- approved or previously-qualitid designs. 4.2.1 Verification alternatives. The mandacturer may propose alternative test methods, techniques, or equipment, including the application of statistical process control, tool controi, or cost effective sampling procedures to ver performance.
25、 See the contract for altematives that replace verification methods required by this specification. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-DTL-62738A O6 2060328 565 MIL-DTL-6273 8A(AT) TABLE II. Verifica1 Title Design, materials & m
26、anufactwing processes perating requirements Input power Logic levels PWA set up Point voltage output signai Ignition signai output Ignition inhibit Interface requirements Overall envelope and interfaces Ownership & support requirements Interchangeabiity Identification marking herating environment re
27、quirements Temperature Fungus Shock Vibration Input peak limiting n methods. Reauirement 3.2 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.4 3.4.1 3.5 3.5.1 3.5.2 3.6 3.6.1 3.6.2 3.6.3 3.6.4 Verification 4.2 4.2.3 4.2.3.1 4.2.3.2 4.2.3.3 4.2.3.4 4.2.3.5 4.2.3.6 4.2.3.7 4.2.4 4.2.4.1 4.2.5 4.2.5.1
28、4.2.5.2 4.2.6 4.2.6.1 4.2.6.2 4.2.6.3 4.2.6.4 4.2.2 InsDection conditions. Unless otherwise specified herein, all inspections shall be performed under the following standard (room) ambient conditions: a. Temperature: 77 2 18F (25 +8OC). b. Relative humidity: Uncontrolled room ambient. c. Barometric
29、pressure: Site pressure. 4.2.3 Operating reauirements verification. 4.2.3.1 Inout power. To determine conformance to 3.3.1, t,e input current shad be measured with an ammeter. 4.2.3.2 CMOS logic levels. To determine conformance to 3.3.2, the input and output CMOS logic levels shall be observed and v
30、erified with an oscilloscope. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-b273A m 999990b 20b0329 4TL m MIL-DTL-6273 8A(AT) 4.2.3.3 PWA setup. To determine conformance to 3.3.3, E5 and E9 shall be attached to ground. An 18 kohm resistor
31、 shall be attached at E4 and 8.0 50.4 Vdc shall be applied to the unterminated end. A 24 Vdc shall be applied at E6. A 5.0 &O. 1 Vdc shall be applied at E7. These voltages shall be verified to be present with a voltmeter for the tests of 4.2.3.4 through 4.2.3.7. 4.2.3.4 Input peak limiting. To deter
32、mine conformance to 3.3.4, the waveform of figure 1 shall be applied at El with respect to E2 and the signal at El shall be verified to approximate the waveform of figure 2. 4.2.3.5 Points voltage output simal. To detennine conformance to 3.3.5, an 18 i 1.8 kohm resistor shall be connected to E4 and
33、 8.0 k0.4 Vdc shall be applied to the unterminated end. The waveform of figure 3 shall be applied at El with respect to E2 using a source with output impedance of 10 il ohms. The signal amplitude shall be measured at E3 and it shall be verified that no signal peak exceeds 6.8 9.6 V. 4.2.3.6 Ignition
34、 simal output. To determine conformance to 3.3.6, the si of figure 3 shall be applied to El with respect to E2 and it shall be verified that the signal at E4 conforms to the requirements of 3.3.6. Trigger the oscilloscope on the negative slope of the output at E3. Measure that time interval fiom the
35、 start of the sweep until the output signal reaches half of its peak level. 4.2.3.7 Ignition - inhibit. To determine conformance to 3.3.7, a 10 ohm, lo%, 100 watt resistor shall be attached to El and the waveform of figure 3 shall be applied at the unterminated end with respect to E2 with a source c
36、apable of supplying not less than 2 amperes. A logic level O shall be applied at E8 and it shall be verified that the signal at El conforms to the requirements of 3.3.7. 4.2.4 Interface reauirements verification. 4.2.4.1 Overall envelope inspection. Insert the PWA into the present existing location
37、of the test set, veri its envelope and interfacing conformance. 4.2.5 Ownership and support requirements verification. 4.2.5.1 Interchangeabilhy inspection. To determine conformance to 3.5.1, the interchangeability between different parts, subassemblies, and assemblies having the same military part
38、number shall be veried. 4.2.5.2 Identification markinp. inspection. Vem the presence of the required PWA identification marking. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62738A 9999906 2060330 LL3 m MIL-DTL-6273 8A(AT) 4.2.6 Operatin
39、g environment requirements verification. The electrical performance tests specified in 4.2.3.1 through 4.2.3.7 shall be conducted prior to and at the completion of each environmental test. Verification of performance during the high temperature and low temperature environmental tests shall be demons
40、trated by the tests specified in 4.2.3.1, and 4.2.3.4 through 4.2.3.7. 4.2.6.1 Temperature. To determine conformance to 3.6.1, the PWA shall be tested as follows: 4.2.6.1.1 High temperature (operating). To determine conformance to 3.6.1.1, the PWA shall be subjected to high temperature test in accor
41、dance with method 501.3, procedure II of MIL-STD-810, or equivalent (see 4.2.1), and tested to 3.3. 4.2.6.1.2 Low temperature (operating). To determine conformance to 3.6.1.2, the PWA shali be subjected to low temperature test in accordance with method 502.3, procedure II of MIL-STD-810, or equivale
42、nt (see 4.2.1), and tested to 3.3. 4.2.6.1.3 High - temperature (nonoperating). To determine conformance to 3.6.1.3, the PWA shall be subjected to high temperature test in accordance with method 501.3, procedure I of MIL-STD-810, or equivalent (see 4.2.1). 4.2.6.1.4 Low temperature (nonoperating). T
43、o determine conformance to 3.6.1.4, the PWA shall be subjected to low temperature test in accordance with method 502.3, procedure I of MIL-STD-810, or equivalent (see 4.2.1). 4.2.6.2 Funws. To determine conformance to 3.6.2, the PWA shall be subjected to the fungus test in accordance with method 508
44、.4 of MIL-STD-810 (28 day test), or equivalent (see 4.2.1). 4.2.6.3 Shock. To determine conformance to 3.6.3, the PWA shall be subjected to the shock test in accordance with method 5 16.4, procedure I, 40g peak of MIL-STD-8 10, or equivalent (see 4.2.1), and tested to 3.3 after shock test. 4.2.6.4 V
45、ibration. To determine conformance to 3.6.4, the PWA shall be subjected to a vibration test using a composite of figures 4 through 6. These figures represent the cargo environment at the cargo bed of a composite of tactical wheeled vehicles, the 5-ton M813 truck and the 12-ton M127 semitrailer. The
46、data include differing vehicle loading conditions traversing over specially designed courses ranging from paved highway to off road conditions at various vehicle speeds. The spectrum is broadband random with peaks and notches at various discrete frequency bands. Break points are provided for establi
47、shing the spectrum shape. The test duration is 500 miles. The PWA shall be tested to 3.3 after the vibration test. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-DTL-62738A 9999906 2060333 05T MIL-DTL-6273 SA(AT) 4.2.6.5 Bum-in. When required
48、 (see 6.2), the bum-in shall consist of three temperature cycles and a six gravity unit (g) root mean square (rms) random vibration as follows: a. Temperature cvcle. Each temperature cycle shall consist of 30 minutes at -60F (-51C) and 30 minutes at +125”F (52C). The rate oftemperature change betwee
49、n temperature extremes shall be not less than 5F (2.S”C) per minute. Power shall be applied to the PWA for not less than 30 minutes from 2OoF (-7OC) through the completion of each high-temperature soak. b. Random vibration. Following all temperature cycling, the PWA shall be hard mounted to the vibration table so that the axis of vibration is perpendicular to the plane of the PWA. The vibration shall be at room ambient temperatu
