1.0Scope
Thistestmethodistodetermineallowablecurrentloadfor
conductors.
2.0ApplicableDocuments
MIL-STD-275PrintedWiringforElectronicEquipment.
3.0TestSpecimen
Testcoupon‘‘G’’ontestpatterninsection5.8.3ofthispub-
licationorproductionboards.
4.0Apparatus
Regulatedpowersupply,loadresistor,andsuitablemeter.
5.0Procedure
5.1Test
5.1.1Applyrequiredcurrentforaperiodof3minutestoter-
minalA-1andE-13ofspecimen.
5.1.2Selectaloadresistorsuchthatwhenpositiveand
groundterminalsofaregulatedpowersupplyareshuntedby
theresistor,acurrentof2ampswillflow.
5.1.3Thecircuitrytobetestedisplacedinserieswiththe
shuntresistor.
5.1.4After3minutesofcurrentflow,observationsshould
bemadetoseeifthereisareductionofcurrentflow.
5.1.5Noteshouldalsobemadetoseeiftherehasbeena
temperatureriseinexcessof20°C.RefertoFig.1.
5.2Evaluation.Observeandrecordmeterreadingsand
visualresults.
Figure1ConductorThicknessandWidth
TheInstituteforInterconnectingandPackagingElectronicCircuits
2215SandersRoad?Northbrook,IL60062
IPC-TM-650
TESTMETHODSMANUAL
Number
2.5.4
Subject
CurrentCarryingCapacity,MultilayerPrinted
Wiring
Date
4/73
Revision
OriginatingTaskGroup
ElectricalContinuityTestingTaskGroup(7-32c)
MaterialinthisTestMethodsManualwasvoluntarilyestablishedbyTechnicalCommitteesoftheIPC.Thismaterialisadvisoryonly
anditsuseoradaptationisentirelyvoluntary.IPCdisclaimsallliabilityofanykindastotheuse,application,oradaptationofthis
material.Usersarealsowhollyresponsibleforprotectingthemselvesagainstallclaimsorliabilitiesforpatentinfringement.
EquipmentreferencedisfortheconvenienceoftheuseranddoesnotimplyendorsementbytheIPC.
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