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
2
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

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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

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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.

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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.


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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.


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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.



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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.


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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.
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RPM33-en-EU_V1.3 4/13
10
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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