MIL-STD-1311B Test Methods for Electron Tubes — Military Standard Manual PDF (EN)

Downloaded from https://www.everyspec.com , ,4 - .+. ,t:.. ,,. MIL-STD-1311B NOTICE2 17 November1976 ., ,., ,:.. MILITARY STtiARO TEST MZTIWDS FOR ELECTRON’TUBES lU ALL’HOLOERSOF MIL-STU-1311B . 1. lie? FOLLOWING PAGESOF MIL-sti-1311BHAVE BEENREVISEDJJ7 SUPER3iOE‘lllS PAGES LISTED(changesare indicatedby an asteriskin the margin): NEW PAGE SUPERSEOEOPAGE ~ 5 2B March197S 6 6 Riprintedwithoutchange 6 August1975 NOTE: Testmethod5246 is out of sequence(locatedfollotiing method5437). Rar@ve and sequencein appropriatelocation. 2. RETAINTHIS NOTICEPAGEANT INSERTBEFORElHE TAJLEOF CUNTENTS. 3. Holdersof MIL-s”iD-1311B will verifythat changesand additions.indi. ated abovehave been entered.

~e maticepage will be retainedas a cAecksheet. ‘IIIis issuance,t.- gerherwith appendedpages,is a separatepublication. Each notice is to be retained by stocking pointsuntilthe MilitaryStandardis completelyrevisedor c.mceled. Custodians: Army - EL Navy - EC Air Force- B5 Preparingactivity: Navy - EC Agent: DSA - ES Reviewactivities: Army - MI, MU Air Force- 11, 17, 99 OSA - ES [Project5960-300B) User activities: .krmy- AV, ME, SM Navy - AS, OS, MC, CG Air Force- 19 FSC 5960 . . .. ., . ..~, ..., ,. .. ,. ;,.... .-.

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Downloaded from https://www.everyspec.com -.. MfL-s’rf3-1311B 28 March 1975 4, GENERAL REQUIREMENTS 4.1 Numbering system. The testmethodsare designatedby numbers assignedinaccordance withthefollowingsystem: 4.1.1 Categoryoftests. Each testmethodisdesignatedby a four-digit number, withsignifi- ‘ assignedinaccordancewiththefollowingcriteria.

(a) Categoryoftubes Numericalseries(firstdigit) General(testsapplicable tomore thanone tubecategory)------------ ------ looot01999 Receiving,transmitting, and power ------- 2000to2999 Ccddcathode,coronaand glowdiscb.mge voltageregulators,graphicindicator, fgnitronpulsemodulators,andthyratrons - - - 3000to3999 Crossedfield,gas switching;klystrom, masnetrOns,M-backward wcm, o-tyW backwardwave, andtravelfng-wavetubes- - - 4000to4999., Cathoderay,cathode-raychargestorage, phcdotubes,image orfhicom,and vidicons- - 5000to5999 Fbdationcodder----------- ------ 6000to6999 (b) Withintheaboveseries,numbers willbe assignedas follows:

Categoryoftests Lastthreedigitsofseries Environmental/Mechanical (physical)------ 001to 199 Electrical-------------- ------- 200to499 Life--------------- --------- 500t0699 4.1.2 Revisions.Revisionstotestmethodswillbeindicatedbyacapitalletterfollowingthe method number. For example,thefirstrevisionofmethod 1001willbe 1001A. Lettersland O willnotbe used. 4.2 Method ofreference.Applicabletestmethodscontainedhereinshallbereferencedon the TSSby specifying themethodnumber ofthisstan&rdanddetailsrequiredbytherneth&.

Applicable methodssballbereferencedwithoutspecifying a revisionletter.Paragraphnumbers withintest methodsshallnotbe referenced.ffa particular paragraph(s)isapplicable, thetitleshallbe speci- fied. 4.3 Order ofprecedence. Unlessotherwisespecified, intheeventofconffict betweenthisstan- dardandtbe tubespecification sheet(TSS),thelattershallgovern. (SeelvUL-E-1, section3, Order ofprecedence.) 4.3.1 Wbenit isstatedinany testmetbodthataquantityistobe measured,itisimpliedtbat themeasurement,titerapplication ofmynecessary correctionfactorsorcalcuktions,istobe withinthelimitsspecifiedon theTSS, or herein.Consequentlythewords”. . andshallbe within tbelimitsspecidied .

‘,arefrequentlyimpliedbutnotstated,toavoidconstantrepetition. 4.3.2 Wberemy specUicvalueorlimitforaparameter isstatedherein,theTSSmay specifya different value,forgoodreaso% suchvaluewillautomatically govern,inaccord.ance withbffL-E-l orderofprecedenceprovisions.Consequentlythewords “. . . ortbe specifiedvalue“ are fre- quentlyimpliedhutnotstated,toavoidconsta.nt repetition. Intheinterestsofstandardization, TSS’Sshouldnotadoptdifferent valuesofsucbparameterswithoutgood reason. 5 ....

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Downloaded from https://www.everyspec.com ,, .-... - MIL-STD-1311B 4.4 Obsolescent testmethods. Testmethodslabelled’’OBSOLESCEXT” areretained inthis. standardbecausetheyarespecif ied..TSS%sfOra limitednumberofolder tubes. Obsolescent 3 methodsshallnotbe specified on new TSS. lfa similarmeWUreme.t isreq.iredfornewtubetYP% a new testmethodwillbe preparedundera different number,reflecting currentWlctice.Obsoles- centmethodswilfb=edeletedfrom thisstzmdardwhen“ofurtherequirements exist.

4.5 &structivetests.TuLmssubjected toad~structive test(see~L-E-1, sectiOn31.sh211n0t be delivered onthecontractororder.The mamdacturerh astbeoptionof.Singdiffere”t ort~ same m.rnplet”be.s when more tbanom?destructive testisrequired. Tubes s.bjectedtodeteri- oratingtests,suchas tbeenvironmental,pbYsicti,.,rfifetes% whichh=’e elect,ic~tests specified asend-point limits,shaflcmdormtotbe i?diafIimitsforthoseelectrical tests,priorto be% subjected todeteriorating tests. 4.6 .41ternate testmethods, hafter”atetestmetbodmaybe substituted fora metbodspecified herei”provideditisdemonstrated totbeqmlSfingGovernmentactivity tbatthereisadequatec.rre- LItio”betwee”tbe resultsofthemanufacturer’.

testmethodandthetestm~thOdspecified herei%and providedtbatsuchsubstitution inno mannerrel=estherequirements of~L-E-l a.dtbisstandard; Tbe schematicdiagramsanddescriptio”of tbetestequipment obe used, shallbe made available forreviewbytbequalifyi”gactivity. 4,7 Additional testing.The rnamfzct”ner may make suchadditional tests.she .>2?deem nec- essarytoinsurepropercontrolofhisproduct. 4.8 Ge”eraltestconditions.

4.8.1 Orderoftesting.Q“alityconformanceinspection testsmaybe conductedinmu’order,at thediscretion ofthemanufacturer.Forq”alification testing(QA),tbefollowin?, tests,whenspeci- fied,shallbeperformedalterallothertestsinanysequence:bump, emission,pulse.alhodecur- rent,roughhandling(formerlydroptest),shock,andvibration. 4.8.2Ambient.O”ditio”s.

fhless otherwisesoecif ied,testtemperature, relative humidity, and atmospheric pressureconditions shallbe inaccordancewithGENERAL REQUIREMENTS of MIL-STD-202, 4.8.3 C%librationof !neastming andtestequipment.Calibration a“dcertification proceduresfor standardsandinstruments wed totestandmeasurecompletely assembledelectrmtubesprocured i“accord?mcewithMIL-E-l,shallbe as specified inMIL-C-45662.Inadditiomthefollowing requirements shallapply: (a)Tbeaccuracyof=ctiibrattig tistr.ment shtilbeatleastfO.rti",es greaterthm thatoftbeitemking cafibrzted.

(b)Cafibratio" bdervafssiiaUbeestablished ontbebasis0fstabilitY, PUI’lmSF, anddegree ofusageforthestandardsandinstruments andshallnotexceeda l-searinterval exceptas indicated below.Intervals shallbe shortenedasrequiredtoassurecontinued accuracy,asevidencedbytheresultsofprecedingcalibrations, a,,dmay be lengthened onlywhentberesultsofpreviouscalibrations providedefinite i“dicatiom thatsuch actionwillnotadverselyeffect theaccuracyofthesystem. The individual changes shallbeapprovedbytbequalifying activity. - 4.8.4 Accuracyofmeasurements.The specified limitsareforvalws obrainedwithlhe specified test.mmiition.

andmeas”ri”geq”ipment ofaccuracyconsistent withgenerali“d”stry practice and calibrated inaccordancewithMIL-c.45662,Allowvmc,es aremade fornormaldistribution measuringim+trumerd accuracyi“establishing testspecificatim sheettestconditi”ma“dtest limits.Acc”racyofmeasurementsSballbeappropriate totbetestparameter(s) beingmeasured andspecific ~im instrument calibrations may beutilized wbe.betteraccuracyChm thatspecified andInaintai”ed forthebasicmeasuringi“strumemisdesired.

4.8.5 Holdingperiods.Aftercompletion ofallmamdacturingp recessesa.dtests,tubesshall be beldmmoperating for rni”imwnperiods,M specified below(t”becategories “otlisted below shallbebeldfora minimum periodof24bow’s).Testsrequiredtobeperformedafterthe holdi”gperiodaredesigmtedcmtheTSS bya note.Tbesetestsshallbethefirstconductedalter tbeboldlngperiod.Otherreq”iredtestsmay be made beforeoraftertbeholdi~period.tthe mamdact.rer, s option. 1 Supersedespage6of 6 A“~st 1975 *..s..m”.c.TP” 8”TtNt,, (c,,c,, ,,,.,o,. row>. 6 --

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