MAINTAINABILITY DESIGN TECHNIQUES METRIC - AcqNotes.com

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Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.DOD-HDBK-791(AM)TABLE 9-4. SPECIFIC TASK ILLUMINATION REQUIREMENTS (Ref. 3)Assembly, missile componentAssembly, generalcoarsemediumfinepreciseBench workroughmediumfineextra fineIllumination Levels*Work Area or Type of Task Recommended MinimumBusiness machine operation(calculator, digital, input, etc.)Console surfaceCorridorsCircuit diagramDialsElectrical equipment testingEmergency lightingGagesHallwaysInspection tasks, generalroughmediumfineextra fineMachine operation, automaticMetersMissilesrepair and servicingstorage areasgeneral inspectionOffice work, generalOrdinary seeing tasksPanelsfrontrearPassagewayslux10755408101075323054081016153230107554021510755405405402155401075215532305405401075215540755540540325215fc1005075100300507515030010050201005050502050100200300505010020507050503020lux5403255408102155325540107521555403251l054032532532325110325540107521553253255401l0325540325325110110fc503050752003050100200503010503030330103050I 00200303050103050303010109-8(cont’d on next page)
Downloaded from http://www.everyspec.com on 2011-10-29T14:56:01.Readinglarge printnewsprinthandwritten report, in pencilsmall typeprolonged readingTABLE 9-4 (cont’d)DOD-HDBK-791(AM)Illumination Levels*Work Area or Type of Task Recommended Minimumlux fc lux fcRecording 75570 540 50Repair workgeneralinstrumentScales 54050 325 30Screw fastening 54050 325 30Service areas, general 21520 110 10Storageinactive or deadgeneral warehouselive, rough or bulklive, mediumlive, fineSwitchboards 54050 325 30Tanks, container 21520 110 10Testingroughfineextra fineTranscribing and tabulation 1075100 540 50*As measured at the task object or 760 mm (30 in. ) above the floorNOTE 1:NOTE 2:NOTE 3:32554075575575554021555411011032554054010752155Some unusual inspection tasks may require up to 10,800 lux ( 1000 fc)As a guide in determining illumination requirements, the use of a steel scale with 0.38-mm (0.01 -in.) divisionsrequires 1950 lux (180 fc) of light for optimum visibility.The brightness of transilluminated indicators should be compatible with the expected ambient illuminationlevel and should be at least 10% greater than the surrounding brightness; however, the indicator brightnessshould not exceed 300% of the surrounding brightness.3050707070502005101030505010020011032554054054032510753254542153253255401075103050505030100355203030501009-9
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