750d

MIL-STD-750D

METHOD1051.5

TEMPERATURECYCLING(AIRTOAIR)

stisconductedtodeterminetheresistanceofaparttoextremesofhighandlowtemperatures,andtotheeffectof

alternateexposurestotheextremes.

1.1Termsanddefinitions.

mloadshallbedetermined

thicloadsudtosimulateloadingmaynotbe

imumloadingmustmeetthespecifiedconditions.

peraturensorthatislocatedandcalibratedsoastoindicatethesametemperatureasattheworst

stcaindicatorspecimenlocationisidentifiedduringtheperiodiccharacterizationofthe

worstcaloadtemperature.

stcaloadtemperatureisthetemperatureofaspecificareainthechamberwhen

mestcaloadtemperatureshallbedeterminedat

periodicintervals.

umeinthechamber(s)inwhichthetemperatureoftheloadiscontrolledwithinthelimitsspecifiedintable

1051-I.

iceorindividualpiecebeingtested.

pdtimebetweenspecimenremovalfromonetemperatureextremeandintroductionintotheother.

gestloadforwhichtheworstcaloadtemperaturemeetsthetimingrequirements(e3.1).

efromintroductionoftheloadintothechamberuntiltheloadistransferredoutofthechamber.

mber(s)udshallbecapableofprovidingandcontrollingthespecifiedtemperaturesintheworkingzone(s)

rmalcapacityandaircirculationmustenabletheworkingzoneandloadsto

meetthespecifiedconditionsandtiming(e3.1).Worstcaloadtemperatureshallbecontinuallymonitoredduringtestbyindicators

heatconductiontospecimensshallbeminimized.

ensshallbeplacedinsuchapositionwithrespecttotheairstreamthatthereissubstantiallynoobstructionto

ecialmountingisrequired,cimenshallthenbe

subjectedtothespecistshallbeconductedfora

leconsistsofsteps1and2ortheapplicabletestconditiontobecountedasa

tionofthetotalnumberofcyclesspecifiedforthetestmaybeinterruptedforthepurpooftestchamberloadingor

r,ifforanyreasonthenumberofincompletecycles

exceed10percentofthetotalnumberofcyclesspecified,onecyclemustbeaddedforeachincompletecycle.

aldmaybetransferredwhen

ther,thedwelltimeshallnotbelessthan10minutes

andtheloadshallreachthespecifiedtemperaturewithin15minutes.

METHOD1051.5

1of2

MIL-STD-750D

ature-cyclingtestconditions.

||||

|Step|Minutes|Testconditiontemperature(°C)|

||||||||||

|||A|B|C|D|E|F|G|

||||||||||

|1|J10|-55+0|-55+0|-55+0|-65+0|-65+0|-65+0|-55+0|

|Cold||-10|-10|-10|-10|-10|-10|-10|

||||||||||

||||||||||

|2|J10|85+10|125+15|175+15|200+15|300+15|150+15|150+15|

|Hot||-0|-0|-0|-0|-0|-0|-0|

||||||||||

NOTE:dtemperaturemayexceedthe+or-

zero(0)olerancesshallnotbeexceeded.

lowingdetailsshallbespecifiedintheapplicabledetailspecification:

lmounting,ifapplicable(e3.).

nditionletter,ifotherthantestconditionC(e3.).

oftestcycles,ifotherthan20cycles(e3.).

-pointmeasurementsandexaminations,e.g.,end-pointelectricalmeasurements,altest(method1071),orother

acceptancecriteria).

METHOD1051.5

2