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SR200 Surface Roughness Tester User Manual

1. Display Reason for message Motor Error Motor fault Pick up Error Response at pick up level error or faulty connection Over range Selected range too small Can occur in front of a measured value due to excessive slew rate for E a single data point large spike May also occur if the pick up is lifted off the surface Printer connected at start of transmission but later detected as not Data transmit error connected printer off line When battery voltage lt 6 4V key push operations are disabled and display is off When the instrument is in the sleep mode and the MEASURE O key Battery low is pressed then Battery low is displayed for 2 seconds followed by the normal display or operation Stored surface profile is erased Renew or recharge battery SR200 Specifications subject to change Starrett Measure before print pressing PRINT key before measurement No parameter selected pressing PRINT key before selecting printout parameters Printer not connected pressing PRINT key when printer not connected or no computer connected to receive dump data pressing PRINT key during data transmission to printer stop Printing cancelled printing Message displayed for 2 seconds Measure ment Pressing MEASURE O key during traverse stop traverse cancelled a Uetore gta Attempted data dump before measurement Specification Alkaline minimum 600 measurements of 4
2. Specifications subject to change Cut off A few trial measurements made on different surfaces will soon demonstrate that on some the results obtained are very dependent upon the cut off selected This shows that it is important to choose the cut off to suit the surface In general fine surfaces require short cut offs and rough surfaces a longer one The table on the following page gives some guidance on suitable cut offs Evaluation Length A long evaluation length is mainly for use on sheet metal and similar materials where a longer surface is required to be representatives of the material being examined Table of Cut off values lf not otherwise indicated on a drawing the following should be used to determine the cut off Ac IS04288 1996 Recommended Cut off ISO 4288 1996 a o i Sampling Length Periodic Profiles Non periodic Profiles Cut offs Evaluation Length Spacing Distances Sm mm Rz um Ra um Ac mm Ac L mm gt 0 013 to 0 04 0 025 to 0 1 0 006 to 0 02 0 08 0 08 0 4 gt 0 04 to 0 13 gt 0 1 to 0 5 gt 0 02 to 0 1 0 25 0 25 1 25 gt 0 13 to 0 4 gt 0 5 to 10 gt 0 1 to 2 0 8 0 8 4 gt 0 4 to 1 3 gt 10 to 50 gt 2 to 10 2 5 2 5 12 5 gt 1 3 to 4 gt 50 to 200 gt 10 to 80 8 8 40 Operating Error Indications During a measurement a message may be displayed which indicates that an error condition has occurred The messages and the probable causes for their display are as follows
3. 1 Place the reference specimen on a flat surface and set up the instrument to make a traverse across it Make sure that the traverse unit body is parallel to the surface of the standard and that the stylus traverses at right angles to the lay of the grooves 2 Select the 0 8mm or 0 03in cut off and the Ra parameter 3 Make a measurement of the reference specimen and compare the Ra value from the display with that marked on the specimen 4 If it differs by more than 2 use the small screwdriver to turn the sensitivity adjuster This is located through the hole which is located in the front panel of the Display Unit just above the pick up connector 5 Repeat the measurement and adjustment until the measured value is within 2 of the value marked on the specimen Cleaning the Stylus Occasionally clean the stylus with a camel hair brush moistened with a proprietary cleaning agent Pick up Skid To reduce the effect of wear on pick ups with a rotatable skid occasionally turn the skid round to present a new contact surface The skid is clamped by the screw in the front of the pick up When loosening this screw take care not to let the retaining pin next to the skid fall out When retightening the screw ensure that the end cover is correctly positioned with respect o the stylus and that the stylus is free to move Form 965 SR200 4 11 2 5C T starrett com
4. 01um 0 1um 1 0um Rz 0 01um 0 1um 1 0um Rz1max 0 01um 0 1um 1 0um Rt 0 01 ym 0 1um 1 0um Rmr 0 1 0 1 0 1 RPc 1 decimal point 1 imal point 1 decimal point Rsk 0 001 ym 0 001 ym 0 001 um Rda 0 1 deg 0 1 deg 0 1 deg Rsm 1 0um 1 0um 1 0um Print Settings Allows selection of print options User can choose to print any combination of graph parameters and header information The scale of the graph can also be selected SCROLL W through and press the SELECT MI key for each item required a tick will appear alongside the item Units Allows imperial or metric units to be selected Filter Allows filter options of either Gaussian or 2CR see explanation in Chapter 1 Dump Mode This menu mode is used if connecting the SR200 to a PC see below Dump Mode Using your SR200 with a PC If using the SR200 with a PC you will need to select the DUMP MODE option from the main menu Scroll to Dump mode ON Each time the SR200 is switched on the following dump mode menu options will be available Specifications subject to change Starrett EVALUATION LENGTH RANGE UNITS FILTER DUMP MODE All other settings are carried out via the PC SPC Mode If SPC is required this can be switched on by pressing the PRINT and SCROLL W key down simultaneously The following warning screen will appear Warning Changes to the following settings are for advanced functions only Quit OK Selecting OK displays
5. 1 Sensitivity Check and Adjustment 7 1 Cleaning the Stylus 7 1 Pick up Skid 7 1 Starrett Chapter 1 Introduction to Surface Texture terminology and definitions Surface Texture Definitions Every components surface has some form of texture which varies according to its structure and the way it has been manufactured These surfaces can be broken down into three main categories Surface roughness Waviness and Form In order to predict a components behaviour during use or to control the manufacturing process it is necessary to quantify these surface characteristics This is done by using surface texture parameters Surface Texture Parameters Can be separated into three basic types Amplitude Spacing and Hybrid Amplitude Parameters Measures of the vertical characteristics of the surface deviations Spacing Parameters Measures of the horizontal characteristics of the surface deviations Hybrid Parameters Combinations of spacing and amplitude parameters Mean Line Is a least squares line of nominal form fitted through the primary profile where the areas of the profile above and below this line are equal and kept to a minimum separation Profile filters as detailed in 15011562 define the mean lines for the roughness and waviness profiles Cut off A cut off length or sampling length is a filter that uses either electronic 2CR or mathematical Gaussian means to remove or reduce unwanted data in order to look at wavelengths i
6. PRR F Smm mm 0 24in LAMM 2032in DIAMETER O c in 40mm 1 57in RADIUS Specifications subject to change Mounting On a flat surface the display traverse unit can be supported on its three feet If a user wishes to make his own mounting bracket for the unit the dimensions of the fixing holes are shown in figure 7 Figure 7 12mm 0 51in 7mm 0 24in 64mm 2 52in Diameters of clearance holes 8 2mm 0 32in for feet 3 2mm 0 13in for screw Foot screws M thread Specifications subject to change Starrett Chapter 3 Getting Started Battery To insert a battery open the compartment by sliding the door to the right and remove the door from the unit Insert the battery with the terminals positioned as shown in the diagram on the floor of the battery compartment Connecting the Pick up Plug the lead into the socket on the front of the unit and mount the pick up as follows The connector of the pick up lead is screwed into the end of the pick up and is then inserted into the end of the pick up holder with the lead coming out through the slot in the holder It is advisable to connect the lead to the display traverse unit first and then the pick up To connect the pick up to the dis play traverse unit the pick up has 2 threaded ends with location pins Insert the location pin securely into the SR200 body and tighten the threaded collar Rotate the pick up to bring the stylus vertical this can conve
7. given in peaks per cm or per inch Known as Pc before 1997 Rsk Skewness Rsk is a measure of the symmetry of the profile about the mean line This parameter indicates whether the spikes on the surface are predominately negative or positive or if the profile has an even distribution of peaks and valleys Rda R Deltaa or Rda or RDa Arithmetical Mean Slope Arithmetical Mean Slope of the Profile within the Sampling Length Specifications subject to change Starrett Chapter 2 Description The SR200 is a portable self contained instrument for the measurement of surface texture and is suitable for use in both the workshop and laboratory Parameters available for surface texture evaluation are Ra Rz Rt Rp Rmr RPc Rv Rzimax Rsk Rda An explanation of the surface texture parameters evaluated by this instrument is given in Chapter 1 The parameter evaluations and other functions of the instrument are microprocessor based The measurement results are displayed on an LCD screen and can be output to an optional printer or computer for further evaluation The instrument is normally powered by an alkaline non recharge able battery If preferred an optional power adaptor can be used Figure 1 The Equipment The standard SR200 includes e 1 Pickup cable e 1 Traverse unit e 1 Screwdriver e 1 Standard Pickup e 1 Battery e 1 Reference Specimen Note certain items described in this handbook are optional and may not f
8. the Select language and select SPC mode screen Select the SPC Mode then SCROLL W will toggle the mode between ON and OFF When SELECT is pressed with OK selected the previous screen will be shown again S PC ModeON OK Language Settings The default on the SR200 is English Language If the user wishes to select other languages press the PRINT and SCROLL W key down simultaneously The following warning screen will appear Warning Changes to the following settings are for advanced functions only Quit OK Specifications subject to change Selecting OK displays the Select language and select SPC mode screen Select Language Select SPCmode Quit SCROLL W down the options and SELECT m Select Language English Frangais Deutsch Italiano OK SCROLL W down the list of languages with and SELECT W This selection will remain as the default unless power is lost eg battery is removed Specifications subject to change Starrett Chapter 5 Making Measurements Technical Considerations Operating Notes Before measurements are made there are a few general points of procedure which should be observed 1 The surface to be measured must be free from vibration and the instrument must be completely steady during a measurement 2 Always turn the pick up so that the stylus is visibly perpendicular to the surface to be measured 3 Set the display traverse unit so that
9. FILTER DUMP MODE The SCROLL W key is used to cycle through these options and the SELECT E key is used to confirm the set up screen required For a chart of default settings see Chapter 3 Cut Off To select the cut off required select the Cut off option from the main menu Press the SCROLL Y key to toggle through the cut off options until the required cut off is highlighted on the screen then press the SELECT m key See chart in chapter 5 forfurther information Evaluation Length To select the evaluation length required select this option from the main menu Press the SCROLL YW key to toggle through the evaluation length options until the required length is highlighted on the screen then press the SELECT W key The evaluation length options are determined by the cut off length selected Parameters select the Parameters option from the main menu A list of the parameters available will appear Specifications subject to change Starrett on the screen see below Press the SCROLL W key left to right across the columns then press the SELECT W key for each parameter required multiple selections can be made The SELECT key is also used to de select a parameter ga Ra RSm Rz Rz1max ee Rt Rsk Rmr gt gt gt settings Rpc gt gt gt settings Exit When selecting the Rmr and Rpc parameters additional settings need to be specified SCROLL Y onto Settings then click on the SELECT
10. PC Transmission set up is as follows Baud rate 9600 Baud Number of data bits 8 Start bit 1 Stop bit 1 Parity None Resolution Horizontal Vertical 0 5um for Evaluation 10nm Length 8mm 1 0um for Evaluation Length gt 8mm 0 25mm 0 8mm 1 25mm Evaluation length selectable 2 5mm 4 00mm 8 0mm 12 5mm 25 0mm Range selectable 10um 100um 300um Transmission RS232 Transmitted data is unfiltered No parameters are calculated Transmission data Data type Function Comments 2 bytes Number of data values ee une or valies Number of data values 1 byte Ordinate spacing per mm 1 byte First data value Resolution 10nm Difference between this 1 byte Diff data value and the previous data value 80 Stop byte 2 stop bytes are sent Making it possible to test 80 Stop byte for all data values received The total number of transmitted data bytes are number of data values 5 The data value can be calculated from data value n date value n 1 diff data value n n1 Specifications subject to change Chapter 6 Accessories Replacement Standard pick up SR 112 1503 Details as the standard pick up see figure 6 pg 2 5 10mm 400min stylus tip radius Conforms to US specifications ANSI B46 1 Small bore pick up 54m 200pin stylus tip radius SR 112 1504 For general use in small bores on narrow surfaces and in grooves or with the skid supp
11. Starrett User Manual Table Of Contents Chapter 1 Using the SR200 with a PC 3 3 Introduction to Surface Texture Printing 3 3 terminology and definitions 1 1 To cancel print 3 3 Surface Texture Definitions 1 1 Chapter 4 Menu Settings 4 1 Parameter Definitions 1 2 Main Menu 4 1 Ra 1 2 Cut off 4 1 Rp 1 2 Evaluation length 4 1 RSm 1 2 Parameters 4 1 Rz 1 2 Range 4 3 Rz1max 1 2 Range Selector Table 4 3 Rt 1 2 Print Settings 43 Rmr 1 3 Units 43 RPc 1 3 Filter 43 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 Specification for Data Dump 5 5 Chapter 6 Accessories 6 1 Chapter 7 Maintenance 7 1 Calibration 7 1 Reference Standard 7
12. W key The following screen will appear Rmr settings Mr Offset Mean line Offset The SCROLL Y key will cycle through Mr Offset Mean line Offset and Exit The SELECT key will allow the alteration of one of the 2 settings or if Exit is highlighted will return to the main parameter selection screen Pressing SCROLL W will step the cursor or highlighted character through the 3 decimal digits of the percentage then the sign and 3 decimal digits of the offset and then to OK Pressing SELECT W will change the sign digit keep pressing SELECT until the required figure is reached Pressing SCROLL W saves the change and moves the cursor along to the next decimal digit When complete Select OK to return to the previous menu Rmr Settings Mr 001 Offset 00 0um OK The following screen is displayed for Rpc settings and is amended in the same way as above Rpc Bandwidth 00 0um Specifications subject to change Range Allows the user to scroll through the range options The most common settings are as follows For surfaces lt 10 micron peak to valley select range of 10um For surfaces lt 100 micronpeak to valley select range of 100um For surfaces lt 300 micron peak to valley select range of 300um Range Selector Table Parameter Resolution Resolution Resolution at 10um rangeat 100um rangeat 300um range Ra 0 01 ym 0 01 ym 0 1um Rp 0
13. collar When the extension rod is used the short pick up lead is not required and the end of the rod itself is inserted into the holder Pick up The pick up is a variable inductive type transducer which is supported on the surface to be measured by a skid a curved support projecting from the underside of the pick up in the vicinity of the stylus As the pick up traverses across the surface movements of the stylus relative to the skid are detected and con verted into a proportional electrical signal The radius of curvature of the skid is much greater than the roughness spacing This enables it to ride across the surface almost unaffected by the roughness and provide a datum representing the general form of the surface Even so where the waviness is widely spaced it will be necessary to use the pick up with shoe in conjunction with the 2 5mm 0 1in cut off Figure 5 the pickup is supported on the workpiece by the skid Pick up set level with surface There are several different types of pickup available designed for different applications details are given in the Accessories section of this handbook They differ only in the stylus tip radius the dimensions of the housing or position and the shape of the skid The stylus material in all the pickups is diamond for low wear The skids of the standard pickups are of red ruby Figure 6 Standard pick up dimensions a IDENTIFICATION Sin 2 IL 3 z 23mm _ by oin
14. d 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 Specifications subject to change Figure 3a Figure 3b Adjustable Support This can be clamped at any position on the slide of the mounting bracket to provide pick up height adjustment Pick up holder This fits into the crutch of the pick up support and is held in place by a spring plunger A biased holder when used as shown in figure 3 exerts a biasing force on the pick up depending on which way the holder is inserted into the support crutch It can also be used to position the pick up directly underneath the display unit as shown in figure 4 Figure 4 The holder will hold the pick up at right angles to the drive shaft when it is pivoted away from the surface eg while changing the work piece Connector The connector of the pick up lead is screwed into the end of the pick up and is then inserted into the end of the pick up holder with the lead coming out through the slot Specifications subject to change Starrett in the holder It is advisable to connect the lead to the display traverse unit first and then the pick up To connect the pick up to the display traverse unit the pick up has 2 threaded ends with location pins Insert the location pin securely into the SR200 body and tighten the threaded
15. mm measurement length Battery Ni Cad minimum 200 measurements of 4mm measurement length Size 6 LR 61 USA Japan Traverse Speed 1mm sec Measurement metric inch units Cut off values 0 25mm 0 8mm and 2 5mm 0 01in 0 03in and 0 1in Traverse lengths 0 25 25mm 0 05 0 98in Display LCD matrix 8 lines x 20 characters alphanumeric 9 pin D connector female Containing RS232 hardwired handshake RS232 level Transmit function only hardware implemented Remote start 5V logic Accessory socket Remote start short to ground Constant power on instrument 5V logic When connected to Ground constant power is on RS232 Output Printer Configuration If SPC is on Baud rate 4800 Baud Parity Even Data bit length 7 bits Printer head disabled If SPC is off Baud rate 9600 Baud Parity Odd Data bit length 8 bits Printer head enabled Output to printer in ASCII characters or pre selected parameters and provided that G is pre selected a readout of dc corrected surface profile Specifications subject to change Language of printout same as language of display The printout heading is shown below Starrett SR200 Operator Date Object Cutoff Xxx mm Evaluation length xxx mm Filter XXX Specifications subject to change Starrett Specification for Data Dump The following format is used for data dump from SR200 to a
16. n the region of interest Bandwidth Is the ratio of the upper Cut off Lc to the lower Cut off Ls Sample Length The profile is divided into sample lengths which are long enough to include a statistically reliable amount of data For roughness and waviness analysis the sample length is equal to the selected cut off Ic wavelength The sample length is also known as the cut off length Evaluation Length The length in the direction of the X axis used for assessing the profile under evaluation The evaluation length may contain one or more sample lengths For the primary profiles the evaluation length is equal to the sample length Specifications subject to change Starrett 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 Surface texture is quantified by parameters which relate to certain characteristics of the texture The SR200 offers the following parameters Ra Rp Rsm Rz Rt R r RPc Rz1max Rsk Rda Additional parameters can be analysed by downloading results to optional software Ra Universally recognised and most used international parameter of roughness It is the arithmetic mean of the absolute departures of the roughness profile from the mean line Rp Maximum profile peak height Mathematicall
17. niently be done with reference to the identity number engraved at the end of the pick up Position the Pickup stylus on the component to be measured with the stylus parallel to the component see figure 8 below Ensure that the stylus tip is in contact with the surface this can be verified by checking that the identity number engraved at the end of the pick up is vertical The skid should also be in contact with the surface Figure 8 Specifications subject to change 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 Pressing the SCROLL W key brings the display on and the previously selected set up is displayed provided power has been continuously present The display is automatically turned off if the instrument is not used for 30 seconds If the battery is dead or has been removed the previously selected set up is lost When a battery has been replaced and the SCROLL W key is pressed the start up message will display for 2 seconds and then the default settings are restored The default settings are Parameter Ra Cut off 0 8mm Evaluation length 4 0mm Range 100mm Data dump evaluation length 4 0mm Da
18. orm part of your particular system Specifications subject to change Traverse Unit The top panel of the traverse unit carries a membrane type control panel and a liquid crystal display The unit houses the electronics for controlling the measurement sequence computing the mea surement data and outputting the results to the display or to the RS232 port for use with a printer when included or to a com puter for further analysis The unit also contains a drive motor which traverses the pickup across the surface to be measured The measuring stroke always starts from the extreme outward position At the end of the measurement the pickup returns to this position ready for the next measurement The traverse length is determined from selections of cut off or length Figure 2 fr Battery Pick up F Connector Select Key Display Battery Compartment ae RS232 Connector Measure key Scroll key Print key Specifications subject to change T Soe Pick up Mounting Components The pick up is fastened to the drive shaft by the following means Mounting Bracket This is clamped to the drive shaft by means of a knurled knob Although normally used upright as shown in figure 3 it can be turned to angle the pick up or to take it off the centre line as shown in figure 3a It can also be mounted side ways on the drive shaft when the right angle pick up is in use Figure 3 pick up mounting Insert Extension Pick up ro
19. orted independently of the surface being measured On this pick up the skid is integral with the stylus arm housing and is set further back from the stylus This enables the pick up to be used in short bores with the skid supported independently of the surface being measured eg by the datum support stand Figure 9 The small bore pickup Figure 10 The right angle pickup Ginn IDE NTIFCAT OM IDENTIFICATION P T im Mura amam afn t giana je Q mm azon BIT cans 83403 onmes Right Angle Pick up 54m 200pin stylus tip radius SR 112 1505 This pick up is used at right angles to the direction of traverse Accordingly the skid is set at right angles to its normal position It is particular useful in grooves or slots where the lay of the surface texture makes it unsuitable for measurement with a standard or small bore pick up When used on cylindrical workpieces it is important that the stylus and skid should be equidistant from the crest see figure 11 and that the work piece is positioned so that the crest is parallel to the line of traverse Figure 11 Conditions to be observed when the right angle pick up is used on a cylindrical work piece vis mio Specifications subject to change Starrett Recess pick up 54m 200pin stylus tip radius SR 112 1506 This pick up has an extended stylus and skid for measuring at the bottom of a recess or between shoulders and flanges up to 5 7mm deep A special deep recess pick u
20. p is available for measuring up to a depth of 25mm Figure 12 The recess pickup IDENTIFCATION Extension rod SR 112 1510 200mm long extension with integral lead fits between the pick up and carriage The extension rod is fitted to the pick up in the following manner 1 Disconnect the pick up lead from the traverse unit and remove the pick up from the traverse unit carriage 2 Remove the lead from the pick up 3 Carefully locate the central pin of the extension rod with the hole in the pick up and screw the rod and pick up together 4 Thread the lead from the extension rod through the hole provided in the back plate of the traverse unit and connect it to the traverse unit socket 5 fit the pick up into the traverse unit carriage positioned as required Power Adaptor SR 112 3530 Power Adaptor UK SR200 SR 112 3531 Power Adaptor US 110V SR200 SR 112 3532 Power Adaptor EURO 230V 2 PIN SR200 Specifications subject to change Chapter 7 Maintenance Calibration Reference Standard The sensitivity of the instrument is checked with the reference specimen supplied This comprises a ruled surface having an Ra value accurate to within 4 of the value marked on its mount To provide confidence in results it is recommended that a sensitivity check is made at the beginning of each shift Sensitivity Check and Adjustment The procedure for checking and adjusting the pick up sensitivity is as follows
21. splayed menu values of evaluation length and range can be changed and further measurements for data dump can be made see next chapter for further details Printing PRINT key pressing this key causes the evaluated measurement data to be output to the RS232 port When a printer is connected a printout of all the parameters selected in the print menu is made If SPC has been selected see chapter 4 the heading is disabled Where the profile is longer than 80cm the printout will stop after 80cm Pressing PRINT key can print the next 80cm The printout will start from the beginning of the profile if SELECT is activated If no legal surface data is stored the error message Measure before print is displayed To cancel print Pressing the PRINT amp key during printout before display has updated to Main menu state stops the printout and Printer cancelled is displayed for 2 seconds The normal update to Main state then continues Specifications subject to change Chapter 4 Menu Settings The operation of the SR200 is based on making selections from menus presented on the liquid crystal display Two menu states exist these are Main Menu and Data Dump Menu The Data Dump menu is accessed via the Main Menu and is used when connecting to a PC Main Menu The Main Menu accessed by pressing the Scroll key is used to make the following selections CUT OFF EVALUATION LENGTH PARAMETER RANGE PRINT SETTINGS UNITS
22. ta dump range 100mm No parameter graph selected for printout Language English Filter Gaussian If the user wishes to change any of these settings this can be carried out using the SCROLL W and SELECT M keys see Chapter 4 for more detail Press the MEASURE O key When the measurement is completed the pickup returns and the results are displayed on the screen see example below GaussLc 0 80mm Eval Length 25 0mm Ra 0 00um Rz 0 00um Rt 0 00um Rp 0 00um RSmm 0 00um more gt Specifications subject to change Starrett If multiple parameters have been selected they may not fit on the display To continue viewing the remaining results click on the SELECT mM key To cancel a measurement If Measure is pressed during a traverse a stop and reversal without measurement will occur and Measurement Cancelled is displayed Using the SR200 with a PC If the SR200 is connected to a PC then measurements will be taken in dump mode which is selected using the SCROLL W and SELECT Mm keys from the main menu see next chapter for full set up details Position the Pickup stylus on the component to be measured Measurements are then activated from the software on the PC When the measurement is completed the pickup returns and the results are dumped directly to the PC During transfer of the measurement data the message Data Dumping is displayed When the data dump is completed the dump menu still remains active From the di
23. the traverse is made parallel to the surface being measured 4 After a measurement the traverse unit can be removed from the surface as soon as the pick up completes its return stroke The display will remain visible 5 Where the texture of a surface has a predominant direc tional character LAY it is usual to traverse across the lay not along it On a horizontal surface 1 Use the biased pick up holder on the display traverse unit 2 Clean the surface to be measured so that it is free from abrasive material grease suds etc This is necessary to ensure accurate readings and to reduce wear on the skid 3 Make the cut off length and parameter selections required 4 Position the display traverse unit and pick up so that the stylus contacts the surface and the pick up is approximately parallel to the surface Make sure that the length of surface is sufficient for measurement remembering that the traverse motion is inwards towards the display traverse unit 5 Press the Measure key When the traverse is completed the results are displayed and the pick up returns to its extreme outward position 6 If an error message is displayed identify the cause correct it and repeat the measurement On other surfaces On a vertical surface If necessary hold the display traverse unit by hand on the surface making sure that it does not move during the measurement In a small deep bore Fit the optional extension rod between pickup and holder
24. y the largest peak deviation of the roughness profile from the mean line within a sampling length When more than one sampling length is analysed rp is the mean value of the individual rp values for each sample RSm The mean spacing between profile peaks at the mean line measured within the sampling length A profile peak is the highest point of the profile between an upwards and downwards crossing of the mean line Rz Rz Rp Rv and is the maximum peak to valley height of the profile within a sampling length When more than one Sampling Length is analysed Rz is the mean value of the individual Rz values for each Sampling Length Rzimax Maximum Height of Profile Highest peak to valley within a sampling length When measured over several sampling lengths the largest individual sampling length value is taken Also known in the past as Rymax Ry Rmax or Rti Rt Total Height of the Profile Maximum Peak to Valley Height of the Profile in the Assessment evaluation Length In Specifications subject to change Rmr Material Ratio is the length of bearing surface expressed as a percentage of the evaluation length In at a depth below the highest peak Replaces tp Bearing Ratio as defined in ISO 4287 1984 RPc Peak Count The number of local peaks which project through a selectable band centred about the mean line or a line parallel to it The count is determined only over the evaluation length though the results are

SR200 Surface Roughness Tester User Manual

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