1.0ScopeThismethodisdesignedtodeterminedimen-
sionalconformancetospecificationofproduction-cutpanels
oflaminateorprepregforlength,width,andperpendicularity.
2.0ApplicableDocuments
IPC-PC-90
3.0TestSpecimens
3.1SizeProductioncutpanelsinthedimensionsintended
forshipmentshallbeused.
3.2SamplingSamplingratesshallbeinaccordancewith
theapplicablespecification.(Alsosee6.1.)
4.0ApparatusorMaterialUnlessotherwisespecified,
precisionofmeasurementapparatusshallbeinaccordance
withtheapplicablespecification.
4.1Verniercaliperscapableofmeasuringupto914±6.4
mm[36.0±0.25in]orequivalent.
4.2Tapemeasurecapableofmeasuringupto1829mm
[72.0in]
4.3Carpenterssquare,orequivalent
4.4Pingauges,dialindicatorsorequivalent
5.0Procedure
5.1LengthMeasurethelengthoftheedgesofthepanel
thatareparalleltothegraindirectionusingaverniercaliper.
5.2WidthMeasurethelengthoftheedgesofthepanel
thatareperpendiculartothegraindirectionusingavernier
caliper.
5.3Perpendicularity
5.3.1MethodA:bydiagonals
5.3.1.1Measurethediagonalsofthepanelusingvernier
caliperortapemeasure.
5.3.1.2Calculateperpendicularityasfollows:
D=D1–D2(Maximumallowabledifferenceindiagonals)
Where:
D1
=√(L+T)
2
+W
2
D2
=√(L?T)
2
+W
2
L=Nominallengthofpanel[ins]
W=Nominalwidthofpanel[ins]
Tii=Toleranceininchesperinchforperpendicularity
shownintheprocurementdocument.
T=TiixW(Toleranceininches)
5.3.1.3Calculatetheactualdifferenceinthediagonalsfrom
themeasurementstaken.
5.3.1.4Comparetheactualdifferencetotheallowable
maximum.
5.3.2MethodB:Bycarpenterssquare(‘‘RightAngle’’
Square)
5.3.2.1Placethepanelinthecarpenterssquare,contacting
thesquarebyatleasttwocorners.
5.3.2.2Usingsuitablemeans(see4.4)measurethedis-
tanceofthepanel’scornerthatdoesnotcontactthesquare.
5.3.2.3Calculatetheperpendicularitybydividingthedis-
tancebythelengthofthelongestdimensionofthepanel.
5.4EvaluationComparethemeasurementswithdimen-
sionalrequirementsoftheapplicablespecification.Recordthe
numberofpanelsthatdonotcomply.Recordthenumberof
noncomplyingpanelsforeachdimension—length,width,and
perpendicularity.
5.5Reportthenumberofpanels,specifyingwhichdimen-
sion,thatdonotcomplywiththeapplicablespecification.
6.0Notes
6.1SamplingmayalsobedeterminedbyIPC-PC-90on
materialsproducedbycontinuousprocessing.
TheInstituteforInterconnectingandPackagingElectronicCircuits
2215SandersRoad?Northbrook,IL60062
IPC-TM-650
TESTMETHODSMANUAL
Number
2.2.19.1
Subject
Length,WidthandPerpendicularityofLaminate
andPrepregPanels
Date
12/94
Revision
OriginatingTaskGroup
MIL-P-13949TestMethodsTaskGroup(7-11b)
MaterialinthisTestMethodsManualwasvoluntarilyestablishedbyTechnicalCommitteesoftheIPC.Thismaterialisadvisoryonly
anditsuseoradaptationisentirelyvoluntary.IPCdisclaimsallliabilityofanykindastotheuse,application,oradaptationofthis
material.Usersarealsowhollyresponsibleforprotectingthemselvesagainstallclaimsorliabilitiesforpatentinfringement.
EquipmentreferencedisfortheconvenienceoftheuseranddoesnotimplyendorsementbytheIPC.
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