Brookfield DV2T Extra Viscometer Manual de usuario descargar pdf (Pagina 37)

Brookeld Engineering Labs., Inc. Page 37 Manual No. M13-167-B0614

Materialsthatexhibitthixotropywillshowasteadilydecreasingmeasuredviscosityover

time.Materialsthatexhibitpseudoplasticitywillshowachangingviscosityasthespindle

speedchanges.

TIP: Whenaveragingdataforathixotropicmaterial,begintheAveragingDurationafter

theperiodofmostsignicantchangeinmeasuredviscosity.Thiswillreducethe

variabilityintheaveragedvalue.

TIP: Whenaveragingdataforapseudoplasticmaterial,donotaveragetogether(Test

Averaging)datacollectedatdifferentspeeds(orshearrates).

Live Averaging of data occurs during actual testing of a sample. Data can be collected

asanaverageofreadingsoveraspecictimeinterval;eachdatapointsavedintheleis

anaveragedvalue.ThisaveragingisdenedintheDataCollectionsectionofCongure

ViscosityTest.

Single Point AveragingrequiresadenitionofAveragingDuration,theamountoftime

forwhichreadingswillbeaveraged.Thistimeparameterwillbeappliedattheendof

theEndCondition.Inthiscaseasingledatapointwillbecollectedwhichrepresents

theaverageofalldatameasuredduringthespeciedtimeperiod(AveragingDuration).

Multi Point Averagingrequiresadenitionof1)DataInterval,thefrequencyofdata

collectionand2)AveragingDuration,theamountoftimeforwhichreadingswillbe

averaged.Thesetwoparameterswillworkinconjunctiontogeneratemultipledata

pointseachofwhichrepresenttheaverageofalldatameasuredduringtheaverage

durationwithinthespeciedDataInterval.

PostTestAveragingofdataoccursafterthetestiscomplete,throughtheResultsscreen.

Averages and standard deviation values can be generated for data collected in a single

steporacrossseveralstepsofatestgeneratedthroughPGFlashsoftware.Ifthetest

usedtocollectdatautilizedLiveAveraging(describedabove),thenthePostTestAveraging

will produce an average value of averaged data points.

PostTestAveragingcanbespeciedintheReportsectionofCongureViscosityTest(see

SectionIII.7).Whenconguredaspartofthetest,theaveragevalueswillbedisplayed

immediatelyupontestconclusion.IfnotspeciedinReport,PostTestAveragingcan

beselectedfromtheDownArrowintheResultsscreen(seeSectionIII.9).

PostTestAveragingofferstwooptions:StepAveragingandTestAveraging(seeFigure

III-13).

Figure III-13

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Brookfield DV2T Extra Viscometer Manual de usuario Pagina 37