Extech Instruments RPM40 User manual

USERGUIDE



COMBINATIONPHOTO/CONTACTTACHOMETER



ModelRPM40



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RPM40-en-GB_V1.2 10/14

Introduction

ThankyouforselectingtheExtechCombinationPhoto/ContactTachometer,ModelRPM40.This

combinationtachometerisapatenteddesignprovidingcontactandnon‐contactRPM

measurements.Inaddition,linearsurfacespeedscanbemeasuredinft/minorm/min.This

deviceisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsofreliable

service.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthisUser

Guide,ProductUpdates,andCustomerSupport.

Features

Compactpockettachometer

Combinationphotoandcontacttachometer

LaserpointerforPhotoTachometertargeting

Non‐contactPhotoTachometerdetectstargettoadistanceof1.5m(4.9ft.)

Widemeasuringrange0.5to19,999RPM(Contact)and99,999RPM(Photo)

0.1%basicaccuracy

Memory/Recallofhighest,lowest,andlastreadings

Durable,light‐weightABSplastichousing

Safety

1. Useextremecautionwhenthelaserbeamison

2. Donotpointthebeamtowardanyone'seye

3. Becarefulnottoletthebeamstriketheeyefromareflectivesurface

4. Donotusethelasernearexplosivegasesorinotherpotentiallyexplosiveareas



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RPM40-en-GB_V1.2 10/14

MeterDescription

1. RPMAdapter(Contact)

2. SurfaceSpeedWheel

3. LCDDisplay

4. PhotoDetectSensor

5. Laserpointer(red)

6. MonitorIndicator

7. MeasureButton

8. FunctionButton

9. MemoryButton



Thebatterycompartmentislocatedonbackofmeter.



BatteryReplacement

Thelowbatteryindicatorappearswhenthebatteriesneedtobereplaced.Toreplacethe

batteries:

1. OpentherearbatterycompartmentbyremovingthetwoPhillipsheadscrewsthatsecureit

2. Replacethefour1.5VAAbatteriesobservingcorrectpolarity

3. Replacethebatterycoverbeforeattemptingtousethemeter



Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriate

collectionsites,theretailstorewherethebatterieswerepurchased,orwherever

batteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotake

end‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronic

equipment.



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RPM40-en-GB_V1.2 10/14

Operation

Selectingafunction

PressandholdtheMEASUREbutton(7)and,whileholdingMEASURE,useshortpressesofthe

FUNCTIONbutton(8)tostepthroughthemodes.Theavailablemodesare:ContactRPM

measurement,Surfacespeed(m/min),Surfacespeed(ft/min),Surfacespeed(in/min),and

PhotoRPMmeasurement(laserpointerwillswitchONinthismode).



Note:Whenafunctionisselecteditbecomesthedefaultmodeofoperation(evenaftertheunit

ispoweredoff)untilanotherfunctionisselected.

PhotoRPMMeasurement

1. SelectPhotoRPMmeasurementmodeasinstructedintheprevioussection.

2. Applyanappropriatelysizedsquarepieceofreflectivetapetothesurfaceoftheobject

undertest.

3. PressandholdtheMEASUREbuttonandalignthelaserpointerwiththereflectivetape.

Measurementdistanceshouldbelimitedtoadistancerangeof2to60”(5to150cm).

4. VerifythattheMonitorIndicator(6)appearsontheLCDwhenthereflectivetapepasses

throughthebeam.

5. ReleasetheMeasurebuttonwhentheRPMreadingstabilizesontheLCD.

6. Iftherpmisunder50,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.



NOTE:Brightambientlightmayinterferewiththereflectedlight.Shadingthetargetarea

maybenecessaryinsomecases.



CAUTION:Rotatingobjectscanbedangerous.Useextremecare.

Photo Tachometer

Rotating object

Reflective tape

Light source

and reflection

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RPM40-en-GB_V1.2 10/14

ContactRPMMeasurement

1. Installarotatingattachment(coneorfunnel)tothemeter

2. SelectContactRPMmeasurementmodeasdescribedinthe‘Selectingafunction’section.

3. PressandholdtheMEASUREbuttonwhilesimultaneouslyplacingtheRPMadapter(1)

againstthecenteroftherotatingaxistobemeasured.

4. ReleasetheMEASUREbuttonwhenthereadingstabilizes(approximately2seconds).

ReversibleLCDDisplay

TheLCDdisplayindicatesPhotoTachometermeasurementsinonedirectionandContact

measurementsintheoppositedirection.Thispermitstheusertoeasilyreadthemeasurement

digitsinbothmeasurementmodes.

SurfaceSpeedMeasurement

1. SelecttheSurfaceSpeed(m/min,ft/min,orin/min)modeasdescribedaboveinthe

‘Selectingafunction’section.

2. AttachtheSurfaceSpeedwheel(2)tothemeter.

3. PresstheMEASUREbuttonandplacethesurfacespeedwheelagainsttheobjectundertest.

4. ReleasetheMEASUREbuttonwhenthereadingstabilizes(approximately2seconds).

MemoryRecall

Theminimum(dn),maximum(UP),andlast(LA)readingvaluesarestoredinmemoryaftereach

measurement(aftertheMEASUREbuttonisreleased).Toviewthesevalues:

1. PressandholdtheMEMORYbutton(9),thedisplaywilltogglebetweenthestoredreading

anditsidentificationlabel(dnforlowestreading),UPforhighestreading,orLAforlast

reading).

2. ReleasetheMEMORYbuttonandthenpressandholditagaintoviewthenextstored

reading.

3. ReleasetheMEMORYbuttonandthenpressandholditagaintoviewthenextstored

reading.

4. Repeatthesestepsasdesired.



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RPM40-en-GB_V1.2 10/14

Specifications

Measurement&RangePhotoTachometer:5to99,999RPM

ContactTachometer:0.5to19,999RPM

SurfaceSpeed:

m/min.–0.05to1,999.9m/min.

ft/min.–0.2to6,560ft/min.

in/min.–2.0to78,740in/min.

ResolutionRPM 0.1RPM(<1000RPM)

1RPM(≥1000RPM)

m/min 0.01m/min(<100m/min)

0.1m/min(≥100m/min.)

ft/min.0.1ft/min.(<1000ft/min.)

1ft/min(≥1000ft/min.).

in/min.0.1in/min.(<1000in/min.).

1in/min.(≥1000in/min.).

DisplayLCD,size:32mmx28mm(1.26x1.10”)

Large5digitreversibledisplaywithunitofmeasureand

alertindicators

Accuracy±(0.1%ofreading+1digit)

SamplingratePhotomode:1second(>60RPM)

Contactmode:1second(>6RPM)

PhotoTachometerdetectingdistanceTypically50to150cm(2to60”)

TimebasecircuitQuartzcrystal

LaserlightsourceLessthan1mW;Class2laserdiode;645nm

OperatingTemperature0to50°C(32to122°F)

OperatingHumidityLessthan80%R.H.

MemoryStores/Recallshighest,lowest,andlastvalues

Battery4x1.5VAAAbatteries

PowerConsumptionPhototachometer:Approximately20mADC

Contacttachometer:Approximately9.5mADC

Dimensions165x50x33mm(6.5x2.0x1.3”)

Weight182g(0.4lbs.)Batteryweightincluded

AccessoriesincludedBatteries,Reflectivetape60cm(24”),Surfacespeed/rpm

rotatingattachments(cone&funnel)



Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

www.extech.com

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