ARMY MIL-PRF-49307A-1997 COOLER-DEWAR GROUP OR-332 A OR-333 A.pdf

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1、METRICMIL-PRF-49307A(CR)3 JULY 1997SUPERSEDINGMIL-PRF-49307(CR)17 May 1989PERFORMANCE SPECIFICATIONCOOLER-DEWAR GROUP, OR-332/A, OR-333/AThis performance specification is approved for use by USACECOM, Department of theArmy and is available for use by all Departments and Agencies of the Department of

2、 Defense.1. SCOPE1.1 Scope . This performance specification covers only the Cooler-Dewar group to be usedin the AN/ASQ-170, Acquisition Designation Sight (TADS) and the AN/AAQ-11, Pilot NightVision Sensor (PNVS); herein referred to as the Cooler-Dewar.2. APPLICABLE DOCUMENTS2.1 General . The documen

3、ts listed in this section are specified in sections 3 and 4 of thisspecification. This section does not include documents in other section of this specification orrecommended for additional information or as examples. While every effort has been made toensure the completeness of this list, document

4、users are cautioned that they must meet allspecified requirements documents cited in sections 3 and 4 of this specification, whether or notthey are listed.2.2 Government documents .2.2.1 Handbooks . The following handbooks form a part of this specification to the extentspecified herein. Unless other

5、wise specified, the issues of these documents shall be those listed inthe Department of Defense Index of Specifications and Standards (DoDISS) and supplementthereto, cited in the solicitation (see 6.2). Handbooks are for guidance only and therefore are notmandatory.Beneficial comments (recommendatio

6、ns, additions, deletions) and any pertinent data which maybe of use in improving this document should be addressed to: HQ, USA Communications-Electronics Command, ATTN: AMSEL-LC-LEO-E-EP, Fort Monmouth, NJ 07703 by using theStandardization Document Improvement Proposal (DD Form 1426) appearing at th

7、e end of thisdocument or by letter.AMSC N/A FSC 5855DISTRIBUTION STATEMENT A . Approved for public release; distribution is unlimited.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-49307A2HANDBOOKSDEPARTMENT OF DEFENSEMIL-HDBK-454 - Standard

8、 General Requirements for ElectricalEquipment.(Unless otherwise indicated, copies of the above specifications, standards and handbooksare available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D,Philadelphia, PA 19111-5094).2.2.2 Other Government documents, drawings an

9、d publications . The followingGovernment documents, drawings and publications form a part of this specification to the extentspecified herein.PURCHASE DESCRIPTIONDEPARTMENT OF DEFENSEPD-0182-001A - Cooler, Cryogenic, Long Life One Watt Integral,HD-1033D/UADRAWINGSUSACECOM5008609 - Installation and I

10、nterface Dimensions, Mechanical Cryogenic cooler, HD-1033D/UASM-C-806033 - Bellows, CoolerSM-D-806561 - Detector -Dewar DT-594( )/UA(Copies of Specifications, standards, drawings and publications required by contractors inconnection with specific procurement functions should be obtained from the pro

11、curing activity oras directed by the contracting officer).2.3 Order of precedence . In the event of a conflict between the text of this document andthe references cited herein, the text of this document takes precedence. Nothing in this document,however, supersedes applicable laws and regulations un

12、less a specific exemption has beenobtained.3. REQUIREMENTS3.1 First article . When specified (see 6.2.C), the samples shall be subjected to a first articleinspection in accordance with 4.2.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-49307

13、A33.2 Materials . The contractor shall select materials that are fully capable of meeting all ofthe operational and environmental requirements specified herein. The materials specified in theapplicable drawings are recommended, but are not mandatory. Selection criteria for the class,grade or type pa

14、rt shall ensure that the material will be able to perform its intended function whenit is assembled. Verification of the supplier meeting the overall performance requirements shall bethe governing acceptance standard. Recovered materials shall be used to the maximum extentpossible.3.3 Description .

15、The Cooler-Dewar is a component of the AN/ASQ-170, TargetAcquisition Designation Sight (TADS) and the AN/AAQ-11, Pilot Night Vision Sensor (PNVS),an infrared detection system used aboard military aircraft. The cooler-Dewar group consists of aninfrared Detector-Dewar (DT-594/UA), a Cryogenic Cooler (

16、HD-1033D/UA), and a thermalconductor with associated fastening hardware. This group requires further alignment prior tofinal installation in TADS/PNVS.3.3.1. Common module selection . The detector and cooler components shall meet therequirements of their respective documents and be inspected in acco

17、rdance with the verificationassurance provisions of these documents prior to assembly of the Cooler-Dewar Group,OR-333/A (see 6.2.k).3.3.2 Thermal conductor . The bellows thermally connects the cooler cold finger to theDetector-Dewar. The recommended parameters and installation procedure for the the

18、rmalconductor can be found on Drawing SM-C-806033. An alternate definition and installationprocedure of the thermal conductor may be developed by the contractor, but shall be approved bythe Government prior to use (see 6.2.b).3.3.3 Dimensions . To ensure that items produced IAW this specification ac

19、curatelyinterface with existing hardware, dimensions and dimensional tolerances of the Detector-Dewarand Cooler shall be in accordance with Drawings SM-D-806561 and 5008609, respectively.3.4 Design criteria . The devices built IAW this specification shall be designed to ensureform, fit, function and

20、 interface requirements, as specified herein, are met.3.5 Performance characteristics .3.5.1 Defective Elements . Unless otherwise specified herein, the Detector-Dewar shall beoperated at 80 K (+5, -20 K). The Detector-Dewar shall contain no more than 12 defectiveelements. Of the 12 defective elemen

21、ts, no more than 4 may be hard defects. In the central 18elements of the array there shall be no hard defects and no more than 2 soft defects. The central36 elements shall contain no hard defects and no more than 4 soft defects. A maximum of twohard defects may be located in elements 1-72, and a max

22、imum of two may be located in elements109-180. Hard defects shall be separated from one another by at least 4 elements and shall beelectrically strapped to an adjacent element with common ground. Soft defects located within thecentral 36 elements shall be separated from any other defect by at least

23、4 non-defective channels.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-49307A4Soft defects shall not be strapped unless the strapping is from an adjacent hard defect at the end ofa group of 5 commonly grounded elements. (Perform 4.5.1 for a

24、cceptance).3.5.2 Detector Microphonics . When cooled to a temperature of 60-80 K, biased inaccordance with paragraph 3.5.2.1 and vibrated in accordance with paragraph 3.6.3, all elementsof the Detector-Dewar shall have no noise peaks above the white noise reference value greaterthan 6dB from 300 to

25、10,000 hertz (Hz) and 10 dB from 10,001 to 20,000 Hz. (Perform 4.5.2for acceptance).3.5.2.1 Detector bias . The bias current shall not exceed 4.0 milliamperes on any singleelement. The total bias power dissipated by the array shall not exceed 100 milliwatts. Thedetector resistor bias pack shall be o

26、perated at +5.0, 0.2 Vdc. Each detector element shall bebiased with current flow in the same direction. (Perform 4.5.2 for acceptance).3.5.3 Cooldown time . The cooldown time to reach a detector temperature of 80 K shallbe in accordance with Figure 2. (Perform 4.5.3 for acceptance).3.5.4 Cooler inpu

27、t power . The total input power to the cooler shall not exceed that shownin Figure 3 after the detector temperature has reached at least 80 K. The input voltage shall be117 2 volts alternating current (VAC), 400 20 hertz (Hz) power source. Perform 4.5.4 foracceptance.3.6 Environmental conditions .3.

28、6.1 Temperature extremes . The Cooler-Dewar Group shall not be damaged whenoperated at temperatures from -32 C to +60 C and stored at temperatures from -54 C to+71 C.3.6.2 Temperature shock . The Detector-Dewar Group shall not be damaged by suddenchanges in temperature between -54 C and +71 C .3.6.3

29、 Vibration exposure . The Cooler-Dewar Group shall not be damaged when exposedto the vibration levels and amplitudes shown in Figure 1 for a duration of 15 minutes in each ofthe three orthogonal axes. The requirement of 3.5.2 shall also be maintained while subjected tovibration.3.7 Workmanship . All

30、 electronic parts, components, assemblies or subassemblies shall befree of smudges, excess solder, metal chips or the existence of any foreign material on anysurface. Bearing assemblies shall be free from rust, dirt, or tool marks. Wires and integratedcircuitry shall be protected from contact with r

31、ough or irregular surfaces and be shielded fromshorting.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-49307A54. VERIFICATION4.1 Classification of inspections .a. First article inspection (see 4.2).b. Conformance inspection (see 4.3).4.2 Fir

32、st article inspection . Unless otherwise specified in the contract, the first articleinspection shall be performed by the contractor. Reliability verification is required only on theCooler during first article inspection (see 3.1 and 6.2.c.).4.2.1 Visual examination . All materials, parts, processes

33、 and assemblies shall be visuallyexamined in accordance with Table I for conformance to the applicable specification or drawing.TABLE I. Inspections .Inspection Requirement paragraph Verification paragraphAny part or component missing ordamaged3.2 4.2.1Workmanship not as 3.7 4.2.1specified4.2.2. Tes

34、ts . Upon successful completion of the visual examination specified in 4.2.1, foursamples shall be subjected to all inspections listed in Table II. First article Coolers mustsuccessfully meet the requirements of the respective Cooler specification. Inspections may beconducted in any order. Failure o

35、f any test shall constitute failure of the first article (See 6.2).Sampling shall be in accordance with ANSI/ASQC Z1.4.4.2.3 Disposition of first article samples . Sample units, which have been subjected to andpassed first article inspections, may be accepted on the contract or purchase order provid

36、edsample units are resubjected to and pass Group A inspections. The sample reliability first articleCoolers shall not be considered as part of the procurement quantities.TABLE II. First article inspection .Inspection RequirementparagraphVerificationParagraphDefective elements 3.5.1 4.5.1Detector mic

37、rophonics 3.5.2 4.5.2Cooldown time 3.5.3 4.5.3Cooler input power 3.5.4 4.5.4Environmental conditions 3.6 4.6Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-49307A64.3 Conformance inspection . The conformance inspection shall include the exami

38、nation of4.3.1 and the Group inspections of 4.4.4.3.1 Examination . Each Cooler-Dewar assembly shall be examined for compliance withthe requirements specified in 3.5.1 through 3.7. Any redesign or modification of the contractorsstandard product to comply with specified requirements or any necessary

39、redesign ormodification following failure to meet the specified requirements shall receive particular attentionfor adequacy and suitability. This element of inspection shall encompass all visual examinationsand dimensional measurements. Noncompliance with any specified requirements or presence ofone

40、 or more defects preventing or lessening maximum efficiency shall constitute cause forrejection.4.4 Group inspections .4.4.1 Group A inspections . Group A inspection shall be conducted on all Cooler-Dewargroups. Group A tests listed in Table III may be performed in any order. Failure of any testshal

41、l be cause for rejection of that unit.TABLE III. Group A inspection .Inspection RequirementparagraphVerificationparagraphDefective elements 3.5.1 4.5.1Detector microphonics 3.5.2 4.5.2Cooldown time 3.5.3 4.5.3Cooler input power 3.5.4 4.5.44.4.2. Group B inspection . Not required.4.4.3 Group C inspec

42、tion . Group C inspection shall be conducted on Cooler-Dewargroups selected from units which have passed the tests in 4.4.1. The environmental tests of 4.6shall be verified on a sample quantity defined in the contract or purchase order. Unless otherwisespecified in the contract or purchase order, sa

43、mples shall be randomly selected from unitsproduced during sampling period. Sampling schedule ias follows:MONTHLY LOT SIZE NUMBER OF UNITS TO BE TESTED1-9 110-29 230 or more 34.4.3.1 Group C failures . Actions required relative to Group C failures shall be asspecified in the contract or purchase ord

44、er (see 6.2.e).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-49307A74.4.3.2 Re-inspection of conforming Group C samples . Unless otherwise specified, thesample units which have been subjected to and passed Group C inspection may be accepted

45、 onthe contract or purchase order provided that all visible and known damage is repaired and sampleunits are re-subjected to and pass Group A inspections.4.4.4 Group D inspection . Not required.4.5 Methods of inspection . The contractor/supplier may use his own test methods,measuring devices, tools,

46、 fixtures and other equipment during the conduct of verification testing.All of the performance requirements per Section 3 shall be fully verified as being met.4.5.1 Defective elements . To measure compliance with 3.5.1, the detector array shall bechecked for continuity with an ohm meter or similar

47、device with current limited to one (1) ma.Lack of continuity indicates an open element which will be cause for rejection. Failure to meetthe requirements of 3.5.1 shall constitute failure of this test.4.5.2 Detector microphonics . Verify compliance with the performance characteristics of3.5.2 and 3.

48、5.2.1 with a noise power spectrum analyzer or similar device. Failure to meet therequirements of 3.5.2 and 3.5.2.1 shall constitute failure of this test.4.5.3 Cooldown time . Verify compliance with the performance characteristic of 3.5.3 bymeasuring the cooldown time in accordance with Figure 2. Fai

49、lure to meet the requirement of3.5.1 shall constitute failure of this test.4.5.4 Cooler input power . Verify compliance with 3.5.4 by using an ohm meter or similardevice and comparing these values with the requirements indicated in Figure 3. Failure to meetthe requirements of 3.5.4 shall constitute failure of this test.4.6 Environmental tests . Environmental testing methods contained in 6.2. d a