Brookfield DV3T - III.12 Data Averaging

Brookeld Engineering Labs., Inc. Page 44 Manual No. M13-167-A0415
 FigureIII-19showsthePowerLawequationforatypicalsetofdata.Abrief
denitionoftheequationwillbeshownifthe“i”(information)buttonispressed.
Figure III-19
 DetailedinformationaboutMathModelsispresentedinSectionVII.
III.12 Data Averaging
TheDV3TRheometerofferstwotechniquestoaveragedata,LiveAveragingandPostTestAveraging.
Dataaveragingcanbeusefulwhenmeasuringsampleswithentrainedairorsuspendedparticlesthat
casesomevariationinmeasurementresults.Dataaveragingmaynotbeusefulwhenchangesin
measurementresultsarecausedbytherheologicalpropertiesofthetestsamplesuchasthixotropyor
pseudoplasticity(shearthinning).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).