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Brookeld Engineering Labs., Inc. Page 41 Manual No. M13-167

value.Thezerovalueshouldnotshiftovertime,however,iftheuserdeterminesthat

thezeroisnotcorrect,youcanforceanAutoZerotobeperformedwithoutpowering

downtheviscometer.WhentheAutoZerofunctionisselected,theDV2Tisimmediately

settoAutoZeromodeandtheuserispresentedwiththeAutoZeroscreen(FigureII-2).

Uponcompletion,theuserwillbereturnedtotheDeviceSetupmenu.

Oscillation Check: TheOscillationCheckisacheckoftheperformanceofthelowerbearingof

theDV2TViscometer.ThislowerbearingiseitherPointandJewelorBall

Bearing.  Correct performance of the lower bearing is essential for proper

operationoftheviscometer.Afailedlowerbearingwillnormallycauseviscosity

measurementstobelowerthanexpected.

AnOscillationCheckisperformedasfollows:

• RemovethespindleandleveltheDV2TViscometer

• Gentlypushupontheviscometercoupling.

• Turnthecouplinguntilthe%Torquereadingis10–15%.

• Gentlyletgoofthecoupling.

• Watchthereading.The%Torquereadingshoulddecreasesmoothly

andoscillateabout0.0%.

SelectingOscillationCheckintheDeviceSetupmenuwillpresenttheuser

rstwithascreeninstructingtoleveltheviscometerandremovethespindle.

Conrmation of level and spindle removal will present the user with the

OscillationCheckscreenasshownbelow.

Figure IV-3

AsuccessfulOscillationCheckwillshowaverysmoothdecreaseof%Torque

withanalvaluewithin+/-0.2of0.0.Anyvalueabove0.2%orbelow-0.2%

indicatesthatacalibrationcheckshouldbeperformed(seeAppendixE).

TIP:HigherTorqueranges(HAandHB)willquicklyreturntothezero

valuewithoutdisplayingmuchoscillation.Thisisnormalbehavior.

TheOscillationCheckisnotaguaranteeofpropercalibration.Itisonlyan

indicationoftheperformanceofthelowerbearingoftheviscometer.Calibration

canonlybeveriedthroughtheuseofacalibrationstandardsuchasBrookeld

Silicone and Mineral Oil standards.

Brookfield DV2T User Manual

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