Varian Cary 5000 User Manual - page 13
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Selectthisoptiontoapplya100%Tbaselinecorrection(100%TBaseline)andazero-
linecorrection(0%TBaseline)tothesamplescan(S).Thiscorrectionisperformedwith
therawtransmissiondataandisthus:
S − 0%TBaseline
100%TBaseline − 0%TBaseline
Withthisoption,theCarywillpromptyoutoperforma100%TBaselinefirst,followed
bya0%TBaselinewhenyouperformabaselinecollection.
Thisbaselineoptioncorrectsforanyinherentvariationsintheelectroniczerolineof
theinstrument.Youshouldusethisbaselineoptionifyoursampleshaveareasofvery
lowtransmission(highabsorbance)asanyvariationsintheinstrument'szerolinewill
affectyourmeasurementsiftheyyoudonotcorrectforthese.YoushouldrefertoASTM
methodE903forfurtherdetails.
ZeroSRAcorrection
Selectthisoptiontoapplya100%Tbaselinecorrection(100%TBaseline)andazero-
linecorrection(0%TBaseline)toasample(S)measuredwithanAbsoluteVWSpecular
ReflectanceAccessory(SRA).
Note
TheVNSRAandthesinglebouncerelativeSRAaccessoriesshouldnotusethis
correction.SelectaBaseline/Zerocorrectioninstead.
Thiscorrectionisperformedwiththerawtransmissiondataand,duetothedouble
bounceonthesample,isthus:
S − 0%TBaseline
100%TBaseline − 0%TBaseline
Withthisoption,theCarywillpromptyoutoperforma100%TBaselinefirst,followed
bya0%TBaselinewhenyouperformabaselinecollection.YoushouldrefertoASTM
methodE903forfurtherdetails.
Zero*Std.Ref.Correction
Selectthisoptiontoapplya100%Tbaseline(100%TBaseline)correctionandazero-
linecorrection(0%TBaseline)toasample(S)measuredwithareflectanceaccessory
whichisnotabsolute(e.g.,aDiffuseReflectanceAccessoryortheVariableAngle
SpecularReflectanceaccessory).TheCarythenmultipliestheresultbytheappropriate
valueinthe'BaselineStdref'filewhicharethetransmissionvaluesassociatedwiththe
StandardReferencematerialyouusedtoestablishthebaseline.Refertothehelpforthe
DiffuseRelectanceaccessoriesforfurtherdetailsaboutStandardReferencematerials.
Thiscorrectionisperformedwiththerawtransmissiondataandisthus:
S − 0%TBaseline
100%TBaseline − 0%TBaseline
Baseline Stdref