SR200 Surface Roughness Tester User Manual...SR200 Specifications subject to change 1.2 Note: almost...

SR200 Surface Roughness Tester

User Manual

Table Of Contents

Chapter 1 Using the SR200 with a PC 3.3 Specification for Data Dump 5.5

Introduction to Surface Texture Printing 3.3 Chapter 6 Accessories 6.1

terminology and definitions 1.1 To cancel print: 3.3 Chapter 7 Maintenance 7.1

Surface Texture Definitions 1.1 Chapter 4 Menu Settings 4.1 Calibration 7.1

Parameter Definitions 1.2 Main Menu 4.1 Reference Standard 7.1

Ra 1.2 Cut off 4.1 Sensitivity Check and Adjustment 7.1

Rp 1.2 Evaluation length 4.1 Cleaning the Stylus 7.1

RSm 1.2 Parameters 4.1 Pick-up Skid 7.1

Rz 1.2 Range: 4.3

Rz1max 1.2 Range Selector Table 4.3

Rt 1.2 Print Settings: 4.3

Rmr 1.3 Units: 4.3

RPc 1.3 Filter: 4.3

Rsk 1.3 Dump Mode: 4.3

Rda 1.3 Dump Mode (Using your SR200

Chapter 2 Description 2.1 with a PC) 4.3

The Equipment 2.1 SPC Mode 4.4

Traverse Unit 2.2 Language Settings 4.4

Pick-up Mounting Components 2.3 Chapter 5 5.1

Mounting Bracket 2.3 Making Measurements

Adjustable Support 2.4 Technical Considerations 5.1

Pick-up holder 2.4 Operating Notes 5.1

Connector 2.4 On a horizontal surface 5.1

Pick-up 2.5 On other surfaces 5.1

Mounting 2.6 Cut off: 5.2

Chapter 3 Getting Started 3.1 Evaluation Length: 5.2

Battery 3.1 Table of Cut-off values 5.2

Connecting the Pick-up 3.1 Operating Error Indications 5.2

Making a measurement 3.2 Specification 5.3

Switching the SR200 ON 3.2 RS232 Output 5.3

To cancel a measurement 3.3 Printer Configuration 5.3

1.1 SR200 Specificationssubjecttochange

Chapter 1

Introduction to Surface Texture terminology and definitions

Surface Texture Definitions Everycomponentssurfacehassomeformoftexturewhichvariesaccordingtoitsstructureandthewayithasbeenmanufactured.Thesesurfacescanbebrokendownintothreemaincategories:Surfaceroughness,WavinessandForm.Inordertopredictacomponentsbehaviourduringuseortocontrolthemanufacturingprocess,itisnecessarytoquantifythesesurfacecharacteristics.Thisisdonebyusingsurfacetextureparameters.

Surface Texture Parameters:Canbeseparatedintothreebasictypes:Amplitude,SpacingandHybrid.

Amplitude Parameters:Measuresoftheverticalcharacteristicsofthesurfacedeviations.

Spacing Parameters:Measuresofthehorizontalcharacteristicsofthesurfacedeviations.

Hybrid Parameters:Combinationsofspacingandamplitudeparameters.

Mean Line:Isaleastsquareslineofnominalformfittedthroughtheprimaryprofilewheretheareasoftheprofileaboveandbelowthislineareequalandkepttoaminimumseparation.ProfilefiltersasdetailedinISO11562definethemeanlinesfortheroughnessandwavinessprofiles.

Cut-off:Acut-offlength(orsamplinglength)isafilterthatuseseitherelectronic(2CR)ormathematical(Gaussian)meanstoremoveorreduceunwanteddatainordertolookatwavelengthsintheregionofinterest.

Bandwidth:IstheratiooftheupperCut-off(Lc)tothelowerCut-off(Ls).

Sample Length:Theprofileisdividedintosamplelengthsl,whicharelongenoughtoincludeastatisticallyreliableamountofdata.Forroughnessandwavinessanalysis,thesamplelengthisequaltotheselectedcut-off(lc)wavelength.Thesamplelengthisalsoknownasthecut-offlength.

Evaluation Length:ThelengthinthedirectionoftheXaxisusedforassessingtheprofileunderevaluation.Theevaluationlengthmaycontainoneormoresamplelengths.Fortheprimaryprofilestheevaluationlengthisequaltothesamplelength.

SR200 Specificationssubjecttochange 1.2

Note: almost all parameters are defined over one sample length, however in practice more than one sample length is assessed (usually five) and the mean calculated. This provides a better statistical estimate of the parameters measured value.

Parameter Definitions Surfacetextureisquantifiedbyparameterswhichrelatetocertaincharacteristicsofthetexture.TheSR200offersthefollowingparameters:

Ra,Rp,Rsm,Rz,Rt,Rmr,RPc,Rz1max,Rsk,Rda

Additionalparameterscanbeanalysedbydownloadingresultstooptionalsoftware.

Ra:Universallyrecognised,andmostused,internationalparameterofroughness.Itisthearithmeticmeanoftheabsolutedeparturesoftheroughnessprofilefromthemeanline.

Rp:Maximumprofilepeakheight

Mathematically,thelargestpeakdeviationoftheroughnessprofilefromthemeanlinewithinasamplinglength.

Whenmorethanonesamplinglengthisanalysedrpisthemeanvalueoftheindividualrpvaluesforeachsample.

RSm:Themeanspacingbetweenprofilepeaksatthemeanline,measuredwithinthesamplinglength.(Aprofilepeakisthehighestpointoftheprofilebetweenanupwardsanddownwardscrossingofthemeanline).

Rz:Rz=Rp+Rvandisthemaximumpeaktovalleyheightoftheprofilewithinasamplinglength.

WhenmorethanoneSamplingLengthisanalysedRzisthemeanvalueoftheindividualRzvaluesforeachSamplingLength.

Rz1max:MaximumHeightofProfile

Highestpeaktovalleywithinasamplinglength.Whenmeasuredoverseveralsamplinglengthsthelargestindividualsamplinglengthvalueistaken.

AlsoknowninthepastasRymax,Ry,RmaxorRti

Rt:TotalHeightoftheProfile.

MaximumPeaktoValleyHeightoftheProfileintheAssessment(evaluation)Length(ln).


Rmr:MaterialRatioisthelengthofbearingsurface(expressedasapercentageoftheevaluationlengthln)atadepthbelowthehighestpeak.

Replacestp%-BearingRatioasdefinedinISO4287-1984

RPc:PeakCount

Thenumberoflocalpeakswhichprojectthroughaselectablebandcentredaboutthemeanlineoralineparalleltoit.Thecountisdeterminedonlyovertheevaluationlengththoughtheresultsaregiveninpeakspercm(orperinch)

KnownasPcbefore1997

Rsk:Skewness

Rskisameasureofthesymmetryoftheprofileaboutthemeanline.

Thisparameterindicateswhetherthespikesonthesurfacearepredominatelynegativeorpositiveoriftheprofilehasanevendistributionofpeaksandvalleys.

Rda:RDeltaaorRdaorRDa-ArithmeticalMeanSlope

ArithmeticalMeanSlopeoftheProfilewithintheSamplingLength.


Chapter 2

Description

TheSR200isaportable,self-containedinstrumentforthe

measurementofsurfacetextureandissuitableforuseinboththeworkshopandlaboratory.Parametersavailableforsurfacetextureevaluationare:

Ra, Rz, Rt, Rp, Rmr, RPc, Rv, Rz1max, Rsk, Rda

AnexplanationofthesurfacetextureparametersevaluatedbythisinstrumentisgiveninChapter1.

Theparameterevaluationsandotherfunctionsoftheinstrumentaremicroprocessorbased.ThemeasurementresultsaredisplayedonanLCDscreenandcanbeoutputtoanoptionalprinterorcomputerforfurtherevaluation.

Theinstrumentisnormallypoweredbyanalkalinenon-recharge-ablebattery.Ifpreferred,anoptionalpoweradaptorcanbeused

Figure 1

The Equipment

ThestandardSR200includes:•1Traverseunit•1StandardPickup•1ReferenceSpecimen

•1Pickupcable•1Screwdriver•1Battery

Note: certain items described in this handbook are optional and may not form part of your particular system.


Traverse Unit

Thetoppanelofthetraverseunitcarriesamembranetypecontrolpanelandaliquidcrystaldisplay.Theunithousestheelectronicsforcontrollingthemeasurementsequence,computingthemea-

surementdataandoutputtingtheresultstothedisplay,ortothe

RS232portforusewithaprinter(whenincluded)ortoacom-

puter,forfurtheranalysis.

Theunitalsocontainsadrivemotorwhichtraversesthepickup

acrossthesurfacetobemeasured.Themeasuringstrokealwaysstartsfromtheextremeoutwardposition.Attheendofthemeasurementthepickupreturnstothispositionreadyforthenext

measurement.Thetraverselengthisdeterminedfromselectionsofcut-offorlength.

Figure 2

Pick-up Connector Select Key Display

Battery Compartment

RS232 Connector

Measure key Scroll key Print key

Battery


Pick-up Mounting Components

Thepick-upisfastenedtothedriveshaftbythefollowingmeans:

Mounting Bracket. Thisisclampedtothedriveshaftbymeansofaknurledknob.Althoughnormallyusedupright,asshowninfigure3,itcanbeturnedtoanglethepick-uportotakeitoffthecentreline,asshowninfigure3a.Itcanalsobemountedside-waysonthedriveshaft,whentherightanglepick-upisinuse.

Figure 3: pick up mounting

Pick-up Insert Extension rod here Clamp Drive Shaft

Connector Adjustable Pick-up Support Mounting Bracket

Pick-up Holder Mounting Bracket Clamp Screw

Use this mounting position when the right angled pick-up is used


Figure 3a Figure 3b

Adjustable Support: Thiscanbeclampedatanypositionontheslideofthemountingbrackettoprovidepick-upheightadjustment.

Pick-up holder: Thisfitsintothecrutchofthepick-upsupportandisheldinplacebyaspringplunger.Abiasedholder,whenusedasshowninfigure3,exertsabiasingforceonthepick-up(dependingonwhichwaytheholderisinsertedintothesupportcrutch).Itcanalsobeusedtopositionthepick-updirectlyunderneaththedisplayunit,asshowninfigure4.

Figure 4

Theholderwillholdthepick-upatrightanglestothedriveshaftwhenitispivotedawayfromthesurface(egwhilechangingtheworkpiece).

Connector: Theconnectorofthepick-upleadisscrewedintotheendofthepick-upandistheninsertedintotheendofthepick-upholder,withtheleadcomingoutthroughtheslot


intheholder.Itisadvisabletoconnecttheleadtothedisplay-traverseunitfirstandthenthepick-up.Toconnectthepick-uptothedisplay-traverseunit:thepick-uphas2threadedendswithlocationpins.InsertthelocationpinsecurelyintotheSR200bodyandtightenthethreadedcollar.

Whentheextensionrodisused,theshortpick-upleadisnotrequiredandtheendoftheroditselfisinsertedintotheholder.

Pick-up: Thepick-upisavariableinductivetypetransducer,whichissupportedonthesurfacetobemeasuredbyaskid,acurvedsupportprojectingfromtheundersideofthepick-upinthevicinityofthestylus.Asthepick-uptraversesacrossthesurface,movementsofthestylusrelativetotheskidaredetectedandcon-vertedintoaproportionalelectricalsignal.Theradiusofcurvatureoftheskidismuchgreaterthantheroughnessspacing.Thisenablesittorideacrossthesurfacealmostunaffectedbytheroughness,andprovideadatumrepresentingthegeneralformofthesurface.Evenso,wherethewavinessiswidelyspaceditwillbenecessarytousethepick-upwithshoe,inconjunctionwiththe2.5mm(0.1in)cut-off.

Figure 5: the pickup is supported on the workpiece by the skid

Thereareseveraldifferenttypesofpickupavailabledesignedfordifferentapplications,detailsaregivenintheAccessoriessectionofthishandbook.Theydifferonlyinthestylustipradius,thedimensionsofthehousingorpositionandtheshapeoftheskid.Thestylusmaterialinallthepickupsisdiamondforlowwear.Theskidsofthestandardpickupsareofredruby.

Figure 6. Standard pick-up dimensions


Mounting: Onaflatsurfacethedisplay-traverseunitcanbesupportedonitsthreefeet.

Ifauserwishestomakehisownmountingbracketfortheunit,thedimensionsofthefixingholesareshowninfigure7.

Figure 7


Chapter 3

Getting Started

Battery Toinsertabattery,openthecompartmentbyslidingthedoortotherightandremovethedoorfromtheunit.Insertthebattery,withtheterminalspositionedasshowninthediagramonthefloorofthebatterycompartment.

Connecting the Pick-up Plugtheleadintothesocketonthefrontoftheunitandmountthepick-upasfollows:Theconnectorofthepick-upleadisscrewedintotheendofthepick-upandistheninsertedintotheendofthepick-upholder,withtheleadcomingoutthroughtheslotintheholder.Itisadvisabletoconnecttheleadtothedisplay-traverseunitfirstandthenthepick-up.Toconnectthepick-uptothedis-play-traverseunit:thepick-uphas2threadedendswithlocationpins.InsertthelocationpinsecurelyintotheSR200bodyandtightenthethreadedcollar.

Rotatethepick-uptobringthestylusvertical;thiscanconvenientlybedonewithreferencetotheidentitynumberengravedattheendofthepick-up.

PositionthePickupstylusonthecomponenttobemeasured,withthestylusparalleltothecomponent(seefigure8below).Ensurethatthestylustipisincontactwiththesurface(thiscanbeverifiedbycheckingthattheidentitynumberengravedattheendofthepick-upisvertical).Theskidshouldalsobeincontactwiththesurface.

Figure 8


Making a measurement Note 1: If the pickup has been changed or the instrument is being used for the first time, the instrument should be calibrated (see Chapter 7).

Note 2: Successful use of the SR200 will only be possible if it is operated on a surface free from external vibration - see also operating notes in Chapter 5.

Switching the SR200 ON PressingtheSCROLLkeybringsthedisplayonandthepreviouslyselectedset-upisdisplayed(providedpowerhasbeencontinuouslypresent).Thedisplayisautomaticallyturnedoffiftheinstrumentisnotusedfor30seconds.

Ifthebatteryisdeadorhasbeenremoved,thepreviouslyselectedset-upislost.WhenabatteryhasbeenreplacedandtheSCROLLkeyispressed,thestartupmessagewilldisplayfor2secondsandthenthedefaultsettingsarerestored.

The default settings areParameter: RaCut-off: 0.8mmEvaluationlength: 4.0mmRange: 100mmDatadumpevaluationlength: 4.0mmDatadumprange: 100mmNoparameter/graphselectedforprintoutLanguage EnglishFilter Gaussian

Iftheuserwishestochangeanyofthesesettings,thiscanbecarriedoutusingtheSCROLLandSELECTkeys(seeChapter4formoredetail)

PresstheMEASUREkey.Whenthemeasurementiscompletedthepickupreturnsandtheresultsaredisplayedonthescreen(seeexamplebelow):

GaussLc 0.80mmEvalLength 25.0mmRa =0.00µmRz =0.00µmRt =0.00µmRp =0.00µmRSmm =0.00µm

more...>


Ifmultipleparametershavebeenselectedtheymaynotfitonthedisplay.Tocontinueviewingtheremainingresults,clickontheSELECTkey.

To cancel a measurement IfMeasureispressedduringatraverse,astopandreversalwithoutmeasurementwilloccurandMeasurementCancelledisdisplayed.

Using the SR200 with a PC IftheSR200isconnectedtoaPCthenmeasurementswillbetakenindumpmode,whichisselectedusingtheSCROLLandSELECTkeysfromthemainmenu(seenextchapterforfullset-updetails).PositionthePickupstylusonthecomponenttobemeasured.MeasurementsarethenactivatedfromthesoftwareonthePC.WhenthemeasurementiscompletedthepickupreturnsandtheresultsaredumpeddirectlytothePC.DuringtransferofthemeasurementdatathemessageDataDumpingisdisplayed.

Whenthedatadumpiscompleted,thedumpmenustillremainsactive.Fromthedisplayedmenu,valuesofevaluationlengthandrangecanbechangedandfurthermeasurementsfordatadumpcanbemade(seenextchapterforfurtherdetails).

Printing PRINTkey:pressingthiskeycausestheevaluatedmeasurementdatatobeoutputtotheRS232port.Whenaprinterisconnected,aprintoutofalltheparametersselectedintheprintmenuismade.

IfSPChasbeenselected(seechapter4)theheadingisdisabled.

Wheretheprofileislongerthan80cmtheprintoutwillstopafter80cm.PressingPRINTkeycanprintthenext80cm.TheprintoutwillstartfromthebeginningoftheprofileifSELECTisactivated.

Ifnolegalsurfacedataisstored,theerrormessage“Measurebeforeprint”isdisplayed.

To cancel printPressingthePRINTkeyduringprintout(beforedisplayhasupdatedtoMainmenustate)stopstheprintoutand“Printercancelled”isdisplayedfor2seconds.ThenormalupdatetoMain-statethencontinues.


Chapter 4

Menu Settings

TheoperationoftheSR200isbasedonmakingselectionsfrommenuspresentedontheliquidcrystaldisplay.Twomenustatesexist,theseare:MainMenuandDataDumpMenu.TheDataDumpmenuisaccessedviatheMainMenuandisusedwhenconnectingtoaPC.

Main Menu TheMainMenu(accessedbypressingtheScrollkey)isusedtomakethefollowingselections:

CUT-OFFEVALUATIONLENGTHPARAMETERSRANGEPRINTSETTINGSUNITSFILTERDUMPMODE

TheSCROLLkeyisusedtocyclethroughtheseoptionsandtheSELECTkeyisusedtoconfirmthesetupscreenrequired.ForachartofdefaultsettingsseeChapter3.

Cut Off: Toselectthecut-offrequired,selecttheCut-offoptionfromthemainmenu.PresstheSCROLLkeytotogglethroughthecut-offoptionsuntiltherequiredcut-offishighlightedonthescreen,thenpresstheSELECTkey.Seechartinchapter5forfurtherinformation.

Evaluation Length. Toselecttheevaluationlengthrequired,selectthisoptionfromthemainmenu.PresstheSCROLLkeytotogglethroughtheevaluationlengthoptionsuntiltherequiredlengthishighlightedonthescreen,thenpresstheSELECTkey.

Theevaluationlengthoptionsaredeterminedbythecut-offlengthselected.

Parameters: selecttheParametersoptionfromthemainmenu.Alistoftheparametersavailablewillappear


onthescreen(seebelow).PresstheSCROLLkeylefttorightacrossthecolumnsthenpresstheSELECTkeyforeachparameterrequired(multipleselectionscanbemade).TheSELECTkeyisalsousedtode-selectaparameter.

Ra RSmRz Rz1max

Rt RskRmr>>> settingsRpc>>> settings

Exit

WhenselectingtheRmrandRpcparameters,additionalsettingsneedtobespecified.SCROLLonto“Settings”thenclickontheSELECTkey.Thefollowingscreenwillappear:

Rmr settingsMr %+OffsetMeanline +OffsetExit

TheSCROLLkeywillcyclethrough‘Mr%+Offset’,‘Meanline+Offset’and‘Exit’.TheSELECTkeywillallowthealterationofoneofthe2settingsor,ifExitishighlighted,willreturntothemainparameterselectionscreen.

PressingSCROLLwillstepthecursor(orhighlightedcharacter)throughthe3decimaldigitsofthepercentage,thenthesignand3decimaldigitsoftheoffsetandthentoOK.PressingSELECTwillchangethesign/digit-keeppressingSELECTuntiltherequiredfigureisreached.PressingSCROLLsavesthechangeandmovesthecursoralongtothenextdecimaldigit.WhencompleteSelectOKtoreturntothepreviousmenu.

Rmr SettingsMr% 001%Offset +00.0µm

OK

ThefollowingscreenisdisplayedforRpcsettingsandisamendedinthesamewayasabove.

Rpc Bandwidth00.0µmOK


Range:Allowstheusertoscrollthroughtherangeoptions.Themostcommonsettingsareasfollows:

Forsurfaces<10micronpeaktovalley-selectrangeof10µm



Range Selector Table ParameterResolutionResolutionResolutionat10µmrangeat100µmrangeat300µmrange

Ra 0.01µm 0.01µm 0.1µmRp 0.01µm 0.1µm 1.0µmRz 0.01µm 0.1µm 1.0µmRz1max 0.01µm 0.1µm 1.0µmRt 0.01µm 0.1µm 1.0µmRmr 0.1% 0.1% 0.1%RPc 1decimalpoint 1decimalpoint 1decimalpointRsk 0.001µm 0.001µm 0.001µmRda 0.1deg 0.1deg 0.1degRsm 1.0µm 1.0µm 1.0µm

Print Settings: Allowsselectionofprintoptions.Usercanchoosetoprintanycombinationofgraph,parametersandheaderinformation.Thescaleofthegraphcanalsobeselected.SCROLLthroughandpresstheSELECTkeyforeachitemrequired-atickwillappearalongsidetheitem.

Units:Allowsimperialormetricunitstobeselected.

Filter: AllowsfilteroptionsofeitherGaussianor2CR(seeexplanationinChapter1).

Dump Mode: ThismenumodeisusedifconnectingtheSR200toaPC(seebelow)

Dump Mode (Using your SR200 with a PC)IfusingtheSR200withaPCyouwillneedtoselecttheDUMPMODEoptionfromthemainmenu.ScrolltoDumpmodeON.EachtimetheSR200isswitchedon,thefollowingdumpmodemenuoptionswillbeavailable:


EVALUATIONLENGTHRANGEUNITSFILTERDUMPMODE

AllothersettingsarecarriedoutviathePC.

SPC Mode IfSPCisrequired,thiscanbeswitchedonbypressingthePRINTandSCROLLkeydownsimultaneously.Thefollowingwarningscreenwillappear:

Warning

Changestothefollowingsettingsareforadvancedfunctionsonly

Quit OK

SelectingOKdisplaystheSelectlanguageandselectSPCmodescreen.SelecttheSPCModethenSCROLLwilltogglethemodebetweenONandOFF.WhenSELECTispressedwithOKselectedthepreviousscreenwillbeshownagain.

S PC ModeON

OK

Language Settings ThedefaultontheSR200isEnglishLanguage.Iftheuserwishestoselectotherlanguages,pressthePRINTandSCROLLkeydownsimultaneously.Thefollowingwarningscreenwillappear:

Warning

Changestothefollowingsettingsareforadvancedfunctionsonly

Quit OK


SelectingOKdisplaystheSelectlanguageandselectSPCmodescreen.

Select Language

Select SPCmode

Quit

SCROLLdowntheoptionsandSELECT

Select LanguageEnglishFrançaisDeutschItaliano

OK

SCROLLdownthelistoflanguageswithandSELECT.Thisselectionwillremainasthedefaultunlesspowerislost(egbatteryisremoved).


Chapter 5 Making Measurements - Technical Considerations

Operating Notes Beforemeasurementsaremade,thereareafewgeneralpointsofprocedurewhichshouldbeobserved.

1.Thesurfacetobemeasuredmustbefreefromvibrationandtheinstrumentmustbecompletelysteadyduringameasurement.

2.Alwaysturnthepick-upsothatthestylusisvisiblyperpendiculartothesurfacetobemeasured.

3.Setthedisplay-traverseunitsothatthetraverseismadeparalleltothesurfacebeingmeasured.

4.Afterameasurement,thetraverseunitcanberemovedfromthesurfaceassoonasthepick-upcompletesitsreturnstroke.Thedisplaywillremainvisible.

5.Wherethetextureofasurfacehasapredominantdirectionalcharacter(LAY),itisusualtotraverseacrossthelay,notalongit.

On a horizontal surface1.Usethebiasedpick-upholderonthedisplay-traverseunit

2.Cleanthesurfacetobemeasured,sothatitisfreefromabrasivematerial,grease,sudsetc.Thisisnecessarytoensureaccuratereadingsandtoreducewearontheskid.

3.Makethecut-off/lengthandparameterselectionsrequired

4.Positionthedisplay-traverseunitandpick-upsothatthestyluscontactsthesurfaceandthepick-upisapproximatelyparalleltothesurface.Makesurethatthelengthofsurfaceissufficientformeasurement,rememberingthatthetraversemotionisinwardstowardsthedisplay-traverseunit.

5.PresstheMeasurekey.Whenthetraverseiscompleted,theresultsaredisplayedandthepick-upreturnstoitsextremeoutwardposition.

6.Ifanerrormessageisdisplayed,identifythecause,correctitandrepeatthemeasurement.

On other surfaces Onaverticalsurface:Ifnecessary,holdthedisplay-traverseunitbyhandonthesurface,makingsurethatitdoesnotmoveduringthemeasurement.

Inasmalldeepbore:Fittheoptionalextensionrodbetweenpickupandholder.


Cut off Afewtrialmeasurementsmadeondifferentsurfaceswillsoondemonstratethatonsome,theresultsobtainedareverydependentuponthecut-offselected.Thisshowsthatitisimportanttochoosethecut-offtosuitthesurface.Ingeneral,finesurfacesrequireshortcut-offsandroughsurfacesalongerone.Thetableonthefollowingpagegivessomeguidanceonsuitablecut-offs.

Evaluation Length Alongevaluationlengthismainlyforuseonsheetmetalandsimilarmaterials,wherealongersurfaceisrequiredtoberepresentativesofthematerialbeingexamined.

Table of Cut-off values Ifnototherwiseindicatedonadrawing,thefollowingshouldbeusedtodeterminethecut-offλc(ISO4288)-1996.RecommendedCut-offISO4288-1996

PeriodicProfiles Non-periodicProfiles Cut-offsSamplingLength/EvaluationLength

SpacingDistancesSm(mm)

Rz(µm) Ra(µm) λc(mm) λc/L(mm)

>0.013to0.04>0.04to0.13>0.13to0.4>0.4to1.3>1.3to4

(0.025)to0.1>0.1to0.5>0.5to10>10to50>50to200

(0.006)to0.02>0.02to0.1>0.1to2>2to10>10to80

0.080.250.82.58

0.08/0.40.25/1.250.8/42.5/12.58/40

Operating Error Indications Duringameasurementamessagemaybedisplayedwhichindicatesthatanerrorconditionhasoccurred.Themessagesandtheprobablecausesfortheirdisplayareasfollows:

Display ReasonformessageMotorError MotorfaultPick-upError Responseatpick-uplevelerrororfaultyconnectionOverrange Selectedrangetoosmall

ECanoccurinfrontofameasuredvalueduetoexcessiveslewrateforasingledatapoint(largespike).Mayalsooccurifthepick-upisliftedoffthesurface

DatatransmiterrorPrinterconnectedatstartoftransmissionbutlaterdetectedasnotconnected(printeroffline)

Batterylow

Whenbatteryvoltage<6.4V:keypushoperationsaredisabledanddisplayisoff.WhentheinstrumentisinthesleepmodeandtheMEASUREkeyispressed,then“Batterylow”isdisplayedfor2seconds,followedbythenormaldisplayoroperation.StoredsurfaceprofileiserasedReneworrechargebattery


Measurebeforeprint pressingPRINTkeybeforemeasurementNoparameterselected pressingPRINTkeybeforeselectingprintoutparameters

PrinternotconnectedpressingPRINTkeywhenprinternotconnectedornocomputerconnectedtoreceivedumpdata.

PrintingcancelledpressingPRINTkeyduringdatatransmissiontoprinter(stopprinting).Messagedisplayedfor2seconds.

Measurementcancelled

PressingMEASUREkeyduringtraverse(stoptraverse)

Measurebeforedatadump

Attempteddatadumpbeforemeasurement

Specification

BatteryAlkaline:minimum600measurementsof4mmmeasurementlengthNi-Cad:minimum200measurementsof4mmmeasurementlengthSize:6LR61(USA/Japan)

TraverseSpeed 1mm/secMeasurement metric/inchunitsCut-offvalues 0.25mm,0.8mmand2.5mm(0.01in,0.03inand0.1in)Traverselengths 0.25-25mm(0.05-0.98in)Display LCD-matrix,8linesx20characters,alphanumeric

9pinD-connectorfemale.ContainingRS232hardwiredhandshake(RS232level).

Accessorysocket

Transmitfunctiononlyhardwareimplemented.Remotestart(5Vlogic)Remotestart:shorttoground.Constantpoweroninstrument(5Vlogic)WhenconnectedtoGround,constantpowerison

RS232 Output PrinterConfiguration

IfSPCisonBaudrate 4800BaudParity EvenDatabitlength 7bitsPrinterheaddisabled

IfSPCisoffBaudrate 9600BaudParity OddDatabitlength 8bitsPrinterheadenabled

Outputtoprinter(inASCIIcharacters)orpre-selectedparametersandprovidedthatGispre-selected,areadoutofdccorrectedsurfaceprofile.


Languageofprintoutsameaslanguageofdisplay

Theprintoutheadingisshownbelow:

StarrettSR200Operator:…Date:……Object:……Cutoff =xxxmmEvaluationlength =xxxmmFilter =xxx


Specification for Data Dump

ThefollowingformatisusedfordatadumpfromSR200toaPC.

Transmission set up is as follows:

Baudrate: 9600BaudNumberofdatabits 8Startbit: 1Stopbit: 1Parity: None

Resolution Horizontal Vertical0.5µmforEvaluation 10nmLength8mm1.0µmforEvaluationLength>8mm

Evaluationlengthselectable0.25mm,0.8mm,1.25mm,2.5mm,4.00mm,8.0mm,12.5mm.25.0mm

Rangeselectable 10µm,100µm,300µmTransmission RS232Transmitteddataisunfiltered NoparametersarecalculatedTransmissiondata

Datatype Function Comments

2bytes Numberofdatavalues Totalnumberoftransmitteddatavalues

1byte Ordinatespacing Numberofdatavaluespermm

1byte Firstdatavalue Resolution10nm

1byte DiffdatavalueDifferencebetweenthisandthepreviousdatavalue

#80 Stopbyte 2stopbytesaresent

#80 Stopbyte Makingitpossibletotestforalldatavaluesreceived

Thetotalnumberoftransmitteddatabytesare,numberofdatavalues+5Thedatavaluecanbecalculatedfrom,datavalue(n)=datevalue(n-1)+diffdatavalue(n),n1.


Chapter 6

Accessories

Replacement Standard pick-up (SR-112-1503) Detailsasthestandardpick-up,(seefigure6pg2.5)10mm(400min)stylustipradius.ConformstoUSspecifications(ANSIB46.1).

Small bore pick-up, 5µm (200µin) stylus tip radius (SR-112-1504) Forgeneraluseinsmallbores,onnarrowsurfacesandingrooves,orwiththeskidsupportedindependentlyofthesurfacebeingmeasured.Onthispick-uptheskidisintegralwiththestylusarmhousingandissetfurtherbackfromthestylus.Thisenablesthepick-uptobeusedinshortboreswiththeskidsupportedindependentlyofthesurfacebeingmeasured,egbythedatumsupportstand.

Figure 9: The small bore pickup Figure 10: The right angle pickup

Right Angle Pick-up, 5µm (200µin) stylus tip radius (SR-112-1505) Thispick-upisusedatrightanglestothedirectionoftraverse.Accordinglytheskidissetatrightanglestoitsnormalposition.

Itisparticularusefulingroovesorslotswherethelayofthesurfacetexturemakesitunsuitableformeasurementwithastandardorsmallborepick-up.Whenusedoncylindricalworkpiecesitisimportantthatthestylusandskidshouldbeequidistantfromthecrest(seefigure11),andthattheworkpieceispositionedsothatthecrestisparalleltothelineoftraverse.

Figure 11: Conditions to be observed when the right angle pick-up is used on a cylindrical work-piece


Chapter 6

Accessories

Replacement Standard pick-up (SR-112-1503) Detailsasthestandardpick-up,(seefigure6pg2.5)10mm(400min)stylustipradius.ConformstoUSspecifications(ANSIB46.1).

Small bore pick-up, 5µm (200µin) stylus tip radius (SR-112-1504) Forgeneraluseinsmallbores,onnarrowsurfacesandingrooves,orwiththeskidsupportedindependentlyofthesurfacebeingmeasured.Onthispick-uptheskidisintegralwiththestylusarmhousingandissetfurtherbackfromthestylus.Thisenablesthepick-uptobeusedinshortboreswiththeskidsupportedindependentlyofthesurfacebeingmeasured,egbythedatumsupportstand.

Figure 9: The small bore pickup Figure 10: The right angle pickup

Right Angle Pick-up, 5µm (200µin) stylus tip radius (SR-112-1505) Thispick-upisusedatrightanglestothedirectionoftraverse.Accordinglytheskidissetatrightanglestoitsnormalposition.

Itisparticularusefulingroovesorslotswherethelayofthesurfacetexturemakesitunsuitableformeasurementwithastandardorsmallborepick-up.Whenusedoncylindricalworkpiecesitisimportantthatthestylusandskidshouldbeequidistantfromthecrest(seefigure11),andthattheworkpieceispositionedsothatthecrestisparalleltothelineoftraverse.

Recess pick-up, 5µm (200µin) stylus tip radius (SR-112-1506) Thispick-uphasanextendedstylusandskidformeasuringatthebottomofarecess,orbetweenshouldersandflangesupto5.7mmdeep.Aspecialdeeprecesspick-upisavailableformeasuringuptoadepthof25mm.

Figure 12: The recess pickup

Extension rod (SR-112/1510) 200mmlongextensionwithintegrallead,fitsbetweenthepick-upandcarriage.Theextensionrodisfittedtothepick-upinthefollowingmanner:

1.Disconnectthepick-upleadfromthetraverseunitandremovethepick-upfromthetraverseunitcarriage.

2.Removetheleadfromthepick-up

3.Carefullylocatethecentralpinoftheextensionrodwiththeholeinthepick-upandscrewtherodandpick-uptogether.

4.Threadtheleadfromtheextensionrodthroughtheholeprovidedinthebackplateofthetraverseunitandconnectittothetraverseunitsocket.

5.fitthepick-upintothetraverseunitcarriage,positionedasrequired.

Power AdaptorSR-112-3530 PowerAdaptor(UK) SR200SR-112-3531 PowerAdaptor(US-110V) SR200SR-112-3532 PowerAdaptor(EURO-230V)(2PIN) SR200

Chapter 7

Maintenance Calibration

Reference Standard Thesensitivityoftheinstrumentischeckedwiththereferencespecimensupplied.ThiscomprisesaruledsurfacehavinganRavalueaccuratetowithin4%ofthevaluemarkedonitsmount.

Toprovideconfidenceinresults,itisrecommendedthatasensitivitycheckismadeatthebeginningofeachshift.

Sensitivity Check and Adjustment Theprocedureforcheckingandadjustingthepick-upsensitivityisasfollows:

1.Placethereferencespecimenonaflatsurfaceandsetuptheinstrumenttomakeatraverseacrossit.Makesurethatthetraverseunitbodyisparalleltothesurfaceofthestandardandthatthestylustraversesatrightanglestothelayofthegrooves.

2.Selectthe0.8mmor0.03incut-offandtheRaparameter.

3.MakeameasurementofthereferencespecimenandcomparetheRavaluefromthedisplaywiththatmarkedonthespecimen.

4.Ifitdiffersbymorethan2%usethesmallscrewdrivertoturnthesensitivityadjuster.ThisislocatedthroughtheholewhichislocatedinthefrontpaneloftheDisplayUnit,justabovethepick-upconnector.

5.Repeatthemeasurementandadjustment,untilthemeasuredvalueiswithin2%ofthevaluemarkedonthespecimen.

Cleaning the Stylus Occasionallycleanthestyluswithacamelhairbrushmoistenedwithaproprietarycleaningagent.

Pick-up Skid Toreducetheeffectofwear,onpick-upswitharotatableskid,occasionallyturntheskidroundtopresentanewcontactsurface.Theskidisclampedbythescrewinthefrontofthepick-up.

Whenlooseningthisscrew,takecarenottolettheretainingpinnexttotheskidfallout.Whenretighteningthescrew,ensurethattheendcoveriscorrectlypositionedwithrespectothestylusandthatthestylusisfreetomove.

7.1 Form965-SR200 4/11 2.5C/T starrett.com

SR200 Surface Roughness Tester User Manual...SR200 Specifications subject to change 1.2 Note: almost...

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