Brookfield DV3T Rheometer Manual do Utilizador descarregar pdf (Página 70)

Brookeld Engineering Labs., Inc. Page 70 Manual No. M13-2100

Code Thecodeisthenumericalvalueusedtoselectthespindle.Thisvalue

mustbeuniqueandcannotbethesameasastandardBrookeld

spindle.TheacceptablerangeforCodeis100-199.

Name TheNameisauniquevaluetodescribethespindle.TheNamewill

bedisplayedintheSpindleeld.TheNamecanbecomprisedof

alphaandnumericcharacters.

SMC TheSMC(SpindleMultiplierConstant)isusedtoconvertthemeasured

torquetoviscosity.TheacceptablerangeofSMCis0.001–500.

The SMC value can be determined through the use of the Range

equationfoundinappendixD.Someexperimentationwiththespindle

andacalibratedviscositystandardisrequired.

Range(cP)=TK*SMC*10,000/RPM

TheTorqueConstant(TK)canbefoundinTableD-2inAppendixD.

SRC TheSRC(ShearRateConstant)isusedtoconvertthesetRPMto

shearrateandcalculateShearStress.TheacceptablerangeofSRC

is 0.001 – 500.

TheSRCvaluecanbedeterminediftheshearratecharacteristicsof

thespindlegeometryareknown.ConsulttheBrookeldpublication,

“MoreSolutionstoStickyProblems”,foradiscussionaboutshear

rateandsomerecommendedequations.

ShearRate(1/s)=SRC*RPM

YMC TheYMC(YieldMultiplierConstant)isusedtoconvertthemeasured

torquetoyieldstress.

Speed List: TheselectionofSpeedinCongureViscosityTestcanbedonebyusingeithera

numberpadorascrolllist.(Thischoiceisselectedthroughthenavigationbuttonin

theSetSpindlescreen.)Whenscrolllistisselected,thespeedentryisrestrictedto

theclassicBrookeldspeedsetsfortheLVandRV/HA/HBrheometers.Thecontents

ofthescrolllistaredenedintheSpeedListmenu.Eachspeedcanbeindividually

selectedordeselectedthroughtheuseofacheckbox.Selectordeselectallspeeds

byusingtheSelectAllcheckbox.SelectordeselectallLV(orRV/HA/HB)speeds

byusingtheSelectAllLVcheckbox.TheclassicBrookeldspeedsetsaredened

below.

LV: 0.3,0.6,1.5,3,6,12,30,60

RV/HA/HB: 0.5,1.0,2.0,2.5,4,5,10,20,50,100

Additionally,anewspeedcanbeaddedtothelistbyselectingtheNewSpeedcommand

keyatthebottomofthedisplay.TheNewSpeedmustbeselectedwithintherange

ofavailablespeedsontheDV3T:0.0–250RPM.

Speedentrythroughthenumberpadisneverrestricted.

TIP:  Toensurethatthecorrectspeedisalwaysentered,createatestthatissaved

totheDV3Tmemory.

TIP:  TheselectionofspeedcanberestrictedbyUserLogIn.Usethisrestriction

combinedwithasavedtestcongurationtoensurethatthecorrectspeed

isalwaysusedforcriticaltests.SeeSectionV.4.2fordetailsofUsersand

Access.

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