1ScopeThistestmethodisusedtoevaluate1:1artwork
mastersforadequacyinmeetingendproductannularring
requirementsfortheexistenceofextra,missing,ormislocated
pads,andforthecorrectnessofconductorplacementrelative
totheholes.
2ApplicableDocumentsNone
3TestSpecimens
3.11:1artworkmastersforeachprintedcircuitlayer
3.2Drilleddummypanel
4Apparatus
4.1Lighttable
4.2Magnifier
5Procedure
5.1.Preparation/DrillDummy
5.1.1PrepareadrilltapetobeusedfortheproductionPCB
correspondingtotheartworkmastersbeingevaluated.
5.1.2Drillapieceofcoppercladcircuitboardmaterialwith
thedrilltape,butmodifytheholesizescalledoutonthemas-
terdrawingasexplainedin5.1.2.1through5.1.2.3.
5.1.2.1ForallofthePTHs,drill18to24milslargerthanthe
maximumafterplatingholesizecalledoutonthemaster
drawingforthathole.
Note:Theexactnumbertobeselectedfromthisrange(18to
24mils)willvaryfromshoptoshop,dependingonsuchvari-
ablesasequipment,tooling,andpanelsize.Asageneralrule,
lowernumbersmeanthatsmallerpanels,betterregistration
tooling,andmoresophisticatedproductionequipmentmust
beused.
5.1.2.2Forallnon-plated-throughholes,drilltheholesto
themaximumsizeindicatedonthemasterdrawing.
5.1.2.3Cleananddeburrthedrilleddummypanel.
5.1.3ArtworkMastersA1:1artworkmastermustbepre-
paredforevaluationforeachprintedcircuitlayer.Thefollow-
ingoptionsapply:
a.Negativesforeachlayer
b.Bleachedpositivesforeachlayer
c.Diazofilmforeachlayer
d.Combinationsoftheabove
5.2Test
5.2.1Tapethedrilleddummypaneltothelighttable.
5.2.2Alignthefirstpieceoffilmtothedummypanel,aver-
agingtherelativepositionsofthedrilledholestothepadson
theartworkmastertomaximizeannularringswithoutbreak-
out.
5.2.3Evaluatetheresultundermagnification,thenremove
thefilm.
5.2.4Alignthenextpieceoffilmandevaluateinthesame
manner.Continuethisprocessuntilalllayershavebeenevalu-
ated.
5.3Evaluation
5.3.1Examineeachlayerwhenalignedtothedrilledpanel
undermagnificationforthefollowingdeficiencies:
a.Breakoutofholetopad
b.Missingpads
c.Mislocatedpads
d.Extrapads
e.Insufficientclearancebetweenconductorsandholes
f.Holesrunningthroughconductors
TheInstituteforInterconnectingandPackagingElectronicCircuits
2215SandersRoad?Northbrook,IL60062
IPC-TM-650
TESTMETHODSMANUAL
Number
2.2.16
Subject
ArtworkMasterEvaluationbyUseofaDrilled
Panel
Date
12/87
Revision
OriginatingTaskGroup
N/A
MaterialinthisTestMethodsManualwasvoluntarilyestablishedbyTechnicalCommitteesoftheIPC.Thismaterialisadvisoryonly
anditsuseoradaptationisentirelyvoluntary.IPCdisclaimsallliabilityofanykindastotheuse,application,oradaptationofthis
material.Usersarealsowhollyresponsibleforprotectingthemselvesagainstallclaimsorliabilitiesforpatentinfringement.
EquipmentreferencedisfortheconvenienceoftheuseranddoesnotimplyendorsementbytheIPC.
Page1of1
|
|
