Extech Instruments RPM33-NIST User manual

USERGUIDE

Model RPM33

Laser Photo / Contact Tachometer

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

RPM33-en-EU_V1.3 4/13

Introduction

CongratulationsonyourpurchaseoftheExtechLaserPhoto/ContactTachometer,ModelRPM33.

TheRPM33digitaltachometeroffersfastandaccuratemeasurementsofthefollowing:

Rotationalspeed(RPM)

TotalRevolutions(REV)

Frequency(Hz)

SurfaceSpeed(metersperminute,inchersperminute,feetperminute,yardsperminute)

Length(meters,inches,feet,andyards)

Featuresincludewidemeasurementrange,highresolution,easy‐to‐readbacklitLCD,MAX‐MIN‐

AVGmemory,Record/Recallreadings,andLasersighting.

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

service.Pleasevisitourwebsite tocheckforthelatestversionofthisUserGuide

RPM33-en-EU_V1.3 4/13

Description

MeterDescription

1. Surface(circumference)wheelaccessoryisshown

connectedtoshaft(rubberconeandconcave

accessoriesarealsosupplied)

2. Adaptorshaft

3. Removablecollar(Photosensorandlasersourceare

locatedatthetopofthemeterunderthiscollar)

4. MEM(Memory)button

5. Batterycompartment(rear)

6. MEASUREbutton

7. MODEbutton

8. LCDDisplay



Push‐buttonDescription



MEM(Memory)button:UsedtoRecord/Recallreadings

MEASUREbutton:Pressandholdtotakereadings.TheLaserpointerwillswitchonforPhoto

tachometermeasurementswhenpressed

MODEbutton:Pressmomentarilytoswitchmeasurementunits.Pressandholdfor2seconds

toswitchbetweenSurfaceSpeedandLengthmeasurementmodes

RPM33-en-EU_V1.3 4/13

Safety

WARNING!

Donotdirectlyviewordirectthelaserpointertowardaneye.

Lowpowervisiblelasersdonotnormallypresentahazard,but

presentpotentialforhazardifvieweddirectlyforextended

periodsoftime.



TheLaserinthisunitcomplieswith:FDA21CFR1040.10and

1040.11,IEC60825‐1(2001‐2008)Edition1.2.EN60825‐

1:1994/A11:1996/A2:2001/A1:2002

CAUTION!

Rotatingandlinearmovingobjectscanbedangerous.Useextremecare.

RPM33-en-EU_V1.3 4/13

PreparingforMeasurements

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

1. Applyasquarepieceofreflectivetapetothesurfaceoftheobjectundertest(nominaltape

size:0.5”/12mm).Besuretoaffixthetapeasclosetotheouteredgeoftheobjectundertest

aspossible.Seediagrambelow.



2. Ifnotalreadydone,unscrewandremovethemetercollar(itemnumber3intheDescription

sectiondiagram)

3. Proceedtothe“TakingMeasurements”sectionbelow.



ContactTachometerPreparation

1. Ifnotalreadydone,attachthecollar(itemnumber3intheDescriptionsectiondiagram)to

themeter.

2. Slidethecontactadaptorontothetachometer’sshaft.Besuretoaligntheadaptorwiththe

alignmentpinontheshaftofthecontactadaptor.

3. Attachacontactmeasurementaccessory(cone,wheel,orconcaveaccessory)ontothe

contactadaptor.

4. ForContactoperationthemetercanmeasureSurfaceSpeedorLength.Readthesection

titled“SurfaceSpeedandLengthMeasurementModes”laterinthisguidefordetails.

5. Followthestepsinthe“TakingMeasurements”sectionbelow.



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.



RPM33-en-EU_V1.3 4/13

ContactTachometerMeasurements

1. PrepareforContactmeasurementsasdescribedintheMeasurementPreparationsection

above.

2. DetermineifSurfaceSpeedorLengthmeasurementsaretobemade.Refertothesection

“SurfaceSpeedandLengthMeasurementModes”laterinthisguidefordetails.

3. PressandholdtheMEASUREbutton.

4. Touchthemeasurementaccessory(cone,wheel,orconcaveaccessory)totheobjectunder

test.

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

6. 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.

7. Tochangetheunitofmeasure,firstreleasetheMEASUREbutton.Then,momentarypresses

oftheMODEbuttonwillstepthroughtheavailableunits.RefertotheSpecificationssection

andtothesectionbelowentitled“SurfaceSpeedandLengthMeasurementModes”forunits

ofmeasuredetails.



SurfaceSpeed,Length,andRevolutionsMeasurementModes

1. ToswitchbetweentheSurfaceSpeedandtheLengthmeasurementmodes,pressandhold

theMODEbuttonfortwoseconds.

2. TheunitsofmeasureavailableintheSurfaceSpeedmodearemetersperminute(M/M),

inchesperminute(I/M),feetperminute(F/M),andyardsperminute(Y/M).Stepthrough

theunitsselectionswithmomentarypressesoftheMODEbutton.

3. TheunitsofmeasureavailableintheLengthmeasurementmodearemeters(M),inches(I),

feet(F),yards(Y),andrevolutions(REV).TheRevolutions(REV)modeishandyasacounter

forusewithcustomsizedwheelattachmentstocount(tally)wheelrotations.Stepthrough

theunitsselectionswithmomentarypressesoftheMODEbutton.





RPM33-en-EU_V1.3 4/13

DatalogReadings

TheRPM33canloguptoten(10)“readingsets”foreachmeasurementsession(foreachunitof

measuredisplay).Areadingsetconsistsoffour(4)values:

Initialreading(readingrecordedwhenMEMbuttonispressed)

Maximumreading(MAXiconshown)

Minimumreading(MINiconshown)

Averagereading(AVGiconshown)

Thistotals400storedreadings(4valuesperreadingset*10readingsetspermeasurement

session*10unitsofmeasuredisplays)

AmeasurementsessionstartswhentheMEASUREbuttonispressedandendswhenitisreleased.

LoggingstartswhentheuserpressestheMEMbuttonmomentarilyandendswhentheMEAUSURE

buttonisreleased.ThenumbershownontheLCDinthelowerrighthandcorner(data0–9)

indicatesthecurrentmemorylocation.Seeexampletime‐linediagrambelow.



MEAS‐01:MEASUREbuttonispressed(measurementsessionbegins)

A:Nologgingduringthisperiod

MEM:MEMbuttonispressedmomentarily,initialreadingisloggedandMIN/MAX/AVG

loggingbegins

B:MAX/MIN/AVGreadingsaretrackedandrecordedduringthisperiod

MEAS‐02:MEASUREbuttonisreleased(measurementsessionandloggingends)



1. PressandholdtheMEASUREbuttontobeginameasurementsessionasdescribedearlier.

2. WhileholdingdowntheMEASUREbutton,presstheMEMbuttonmomentarily.Thereading

onthedisplayatthetimeoftheMEMbuttonpress(initialreading)willbestoredinthe

currentreadingsetandtheMIN/MAX/AVGtrackingwillbegin.Notethereadingsetmemory

locationonthelowerrighthandcorneroftheLCD.

3. TheMIN/MAX/AVGreadingsarecalculatedoverthecourseofthemeasurementsession

(startingfromwhentheMEMbuttonispressedandendingwhentheMEASUREbuttonis

released).MIN/MAX/AVGreadingsarestoredinthesamereadingsetasthe‘initialreading’.

4. ReleasetheMEASUREbuttontoendthemeasurementsession.

5. Now,momentarypressesoftheMEMbuttonstepthroughtheinitialreading,MAX,MIN,

andAVGreadingsstoredinthecurrentmemorylocation.Notethatsubsequentpressesof

theMEMbuttonstepthroughtheremainingninememorylocations;besuretonotethe

memorylocationnumberwhenreviewingdatatoavoidconfusion.

6. Whenrecallingdata,pressandholdtheMEMbuttontoquicklyjumpfromonereadingsetto

another.Thereadingsetnumber,onthelowerright,scrollswhiletheMEMbuttonisheld.



RPM33-en-EU_V1.3 4/13

DataloggingmorethanoneReadingSetperMeasurementSession

IftheMEMbuttonispressedmorethanonceduringameasurementsession,morethanone

readingsetwillbecreatedforthatmeasurementsession(onereadingsetforeachMEM

press).Thisisusefulifmorethanone‘initialreading’isdesiredforagivenmeasurement

session.TheMIN/MAX/AVGvaluesloggedineachreadingsetrepresenttheMIN/MAX/AVG

valuesrecordedbetweentheMEMpresses.Seethetime‐lineexamplebelow:



MEAS‐01:MEASUREbuttonispressed(measurementsessionbegins)

A:Nologgingduringthisperiod

MEM01:MEMbuttonispressedmomentarily,loggingbeginsintolocation‘Data0’

B:Readingset‘Data0’logsinitialreadingandMAX/MIN/AVGreadings

MEM02:MEMpressedagain,previouslog(data0)endsandnewlog(data1)begins

C:Readingset‘Data1’logsinitialreadingandMAX/MIN/AVGreadingsforthistimeperiod

MEAS‐02:MEASUREbuttonisreleased(measurementsessionandloggingends)



BatteryReplacement

ThelowbatteryindicationappearsasBATonthedisplay.Toreplacethebattery,loosenthe

Philipsheadscrewsecuringtherearbatterycoverandliftthecoveroff.Replacethe9Vbattery

andreplacecover.



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.



OtherBatterySafetyReminders

oNeverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.



RPM33-en-EU_V1.3 4/13

Specifications

GeneralSpecifications

TimebaseQuartzcrystal

Display5‐digitLCDDisplay

LaserlightsourceClass2laser<1mWpower;Wavelengthis630to670nm

DetectingDistance50to500mm(2to20")

SamplingTime0.5seconds(over120rpm)

Tachometeraccuracy±(0.05%reading+1digit)

MemoryMeasurementdataarestoredin‘readingsets’.Areadingsetconsistsof

one(1)instantaneousmeasurementplusMIN/MAX/AVGreadings.Ten

(10)‘readingsets’areavailablepermeasurementsession

OperatingConditions0°Cto50°C(32°Fto122°F);RH80%Max

PowerSupply9Vbattery

PowerConsumption45mADCapproximately

Weight151g(5.3oz.)

Size160x60x42mm(6.2x2.3x1.6")



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