User Manual

RPM33-en-EU_V1.3 4/13

TakingMeasurements

Non‐Contact(Photo)TachometerMeasurements

1. PreparefortheNon‐ContactmeasurementasdescribedintheMeasurementPreparation

sectionabove.

2. UsetheMODEbutton(momentarilypresses)toselectRPM(rotationsperminute)orHz

(Hertz:rotationspersecond)astheunitofmeasure.

3. PressandholdtheMEASUREbuttontobeginameasurementsession.

HoldtheMEASURE

buttondownforthedurationofthetestandreleaseittoendthesession.

4. Pointthemetertowardthedeviceundertestatadistanceof2"to20"(50to500mm).Be

suretoalignthelaserlightbeamwiththereflectivetape(seediagramaboveinprevious 

section).

5. Verifythatthe(

(

()

)

)monitorindicatorappearsontheLCDwhenthereflectivetapepasses

throughthelightbeam.

6. ReadthemeasurementresultfromtheLCDdisplay.

7. WhentheMEASUREbuttonisreleasedthelastreadingwillremainonthe

displayfor5to10

secondsbeforethe‘AutoPowerOFF’featureswitchesthemeterOFF.TheHOLDdisplayicon

willswitchON.



Non‐Contact(Phototachometer)MeasurementConsiderations

 Brightambientlightmayinterferewiththereflectedlightbeam.Shadingthetargetarea

maybenecessaryinsomecases.

 Thenon‐reflectiveareamustalwaysbelargerthanthereflectivearea.

 Iftheshaftorrotatingobjectisnormallyreflective,itmustbecoveredwithblacktapeor

paintbeforethereflectivetapeisapplied.

 ToimproverepeatabilityoflowRPMmeasurements,applyadditionalsquaresof

reflectivetape.Dividethereadingshownonthedisplaybythenumberofpiecesof

reflectivetapesquarestocalculatetheactualRPM.

