PCE-2800 Leeb Hardness Tester User`s Manual
Contents
1. Impact direction The present impact direction Hardness scale Hardness scale of the present measured value Battery information Showing the rest capacity of the battery and the charging status Measured value Display present single time measured value without showing average icon or display the present mean value with average icon prompting HI means over conversion value or measure range LO means lower than conversion value or measure range Impact times Times that have been impacted Average Icon It will appear when showing the mean value of the measured values after reaching the presetting impact times Memory Icon It appears when operating the instrument memory 2 3 Keypad Definitions Table 2 1 Turn on off the Data Save or Data Turn the EL backlight Delete instrument on off Material Hardness Strength Plus or Up Selection switch Hardness Scale Direction change Minus or Down Selection Manual Paper Impact Times set Feed Print data Cancel or Exit Data logging or Enter Press key to store present group of measured value into memory This operation is only valid after displaying the mean value Press key 2 and 2 could display single measured value Press 48 key could switch on of off the background light of LCD Press key to set the impact direction Presse key to change the impact times in one group The impact times item will flash when first pressing the J key and then2. Press down the key while powering on the instrument will restore factory defaults The only time this might possibly helpful is if the parameter in the instrument was somehow corrupted 5 9 EL Backlight With the EL background light it is convenient to work in the dark condition Press key 4 to switch on or switch off the background light at any moment as you need after power on Since the EL light will consume much power turn on it only when necessary 5 10 Auto Power Off The instrument features an auto power off function designed to conserve battery life If the tool is idle neither measuring nor any key operation for 5 minutes it will turn itself off Before powering off the LCD display of the instrument will continue flashing for 20 seconds Except key press any key could stop the twinkle of LCD screen and stop the operation of power off at the moment While the voltage of the battery is too low the display will show lt E00 gt then power off automatically When the instrument is being charged the Auto Power Off will not function 5 11 Paper Installation o Hold Both ends of the paper Paper Compartment Cover _ Paper Roller compartment with fingers and open the compartment cover with moderate strength O According to the illustration put the paper into the paper compartment with attention to the paper direction If the paper is misplaced the instrument will fail to print O Pull a trip of paper out of the c
3. www pce industrial needs com Tursdale Technical Services Ltd Unit N12B Tursdale Business Park Co Durham DH6 5PG United Kingdom Phone 44 0 191 377 3398 Fax 44 0 191 377 3357 info tursdaletechnicalservices co uk http www industrial needs com PCE 2800 Leeb Hardness Tester User s Manual a 368 AvE yG info tursdaletechnicalservices co uk 1 Overview 3 1 1 Advantages 3 1 2 Main Application amp Testing Range 3 1 2 1 Main Application 3 1 2 2 Testing Range 3 1 3 Technical Specifications 4 1 4 Configuration 5 1 5 Working Conditions 5 1 6 Safety Instructions 5 2 Structure Feature amp Testing Principle 6 2 1 Structure Feature 6 2 1 1 The Hardness Tester Appearance 6 2 1 2 Parts of the Main body 6 2 1 3 D Type Impact Device 7 2 1 4 Different Types of Impact Device 7 2 2 Main Screen 7 2 3 Keypad Definitions 8 2 4 Leeb Hardness Testing Principle 9 3 Preparation 9 3 1 Instrument Preparation and Inspection 9 3 2 Impact Device Selection 9 3 3 Preparation of the Sample Surface 10 4 Testing Program 11 4 1 Start Up 11 4 2 Loading 11 4 3 Localization 11 4 4 Testing 11 4 5 Read Measured Value 12 4 6 Notification 12 5 Operation Detail 13 5 1 Power On Off 13 5 2 Material Setting 13 5 3 Hardness Strength testing 14 5 4 Impact Direction Setting 14 5 5 Average Times Setting 14 5 6 Data logging 15 5 6 1 Viewing stored file Group 15 5 6 2 Deleting selected file Group 15 5 7 Print Function 15 5 8 Sys
4. calibrated using a standard hardness block before use as the first time or having not been used for a long time or having reset the instrument system Press key meanwhile pressing down the 3 key to power on the system Then the user calibration screen shows as left below Test for 5 points on the standard hardness block It would display the average measured value AVE after measuring 5 times Press E 2 key to HL EN change to 1ts nominal value Press key to confirm the calibration finally Or YJ Z V y o press the key to cancel the calibration a Range of adjustment 30HL The measurement parameters including the material setting the hardness scale and the impact direction can t be changed during calibration Note Use a calibrated hardness tester test the standard test block downward vertically for 5 times the arithmetical average value compare with n id the value of standard test block If this value exceeds the standard value could Aen Selection use the function of user calibration to adjust Refer to Appendix Table 1 and Table 3 for selection of impact device info tursdaletechnicalservices co uk 3 3 Preparation of the Sample Surface Preparation for sample surface should conform to the relative requirement in Appendix Table 3 In the preparation processing for sample surface the hardness effect of being heated or cold processing on the
5. printing id 2 Structure Feature amp Testing Principle 2 1 Structure Feature 2 1 1 The Hardness Tester Appearance 1 Main unit 2 Impact device 2 2 1 2 Parts of the Main body FQ i as y 9 f Ai al ai IN Prr rezo cn gree _ H WU _ TESTER 19 y 1 Socket of impact device 2 Socket of USB 3 LOGO 4 Paper compartment cover 5 LCD display 6 Keypad 7 Battery switch 8 Power jack 9 Serial Number 10 Product label 11 Battery compartment cover info tursdaletechnicalservices co uk 2 1 3 D Type Impact Device 12 3 4 5 6 7 1 Release button 2 Loading tube 3 Guide tube 4 Coil unit 5 Connection cable 6 Impact body 7 Support ring 2 1 4 Different Types of Impact Device y E G DC DL C D 15 2 2 Main Screen Below is the main display screen TO Battery Info Direction AAA Direct Instruction of the Main Displ A JN Y I am m U Ob S AVE ka Hunn n Hardness Scale A HRC HL 7 7 7 D HRB HB Ko K k Impact Times HRA HV Ioe NANA 7 NAPA IANA WI 2 ON ey c YU A Material No don ay Sereen IZ a info tursdaletechnicalservices co uk Material The present presetting material
6. replacing the impact device whether the setting is hardness testing or not before Not all materials could convert to all hardness scale value The hardness scale is reset to HL automatically after changing the material So select material firstly before changing the hardness scale 12 info tursdaletechnicalservices co uk 5 Operation Detail 5 1 Power On Off Press O to power on the instrument Be sure to plug in the impact device before powering on The system would automatically detect the type of the impact device during power up and would display this information on the screen Users should pay attention to the probe type displayed on the screen After pausing for several second the screen will exit and enter the main display screen as following SJ 4 Ny Direction Materia NO mM The instrument can be turned off by pressing the key while it is working The tool has a special memory that retains all of its settings even when the power is off Note f the instrument ts in power off condition it will turns on automatically after the charge power ts connected 5 2 Material Setting Press Y key to change the material to the one you want to preset Hardness scale recovers to HL automatically after material presetting changed Please select material firstly then select hardness scale In hardness testing you can select the material among the followi
7. 800 1180 2652 20 Table 3 Type of impact device eee Impacting energy llmJ llmJ a 7mJ a a ImJ Mass of impact body 5 5g 7 2g 7 88 3 08 20 08 5 5g Test tip hardness Dia Test tip Material of test tip Impact device diameter Impact device length Impact device weight info tursdaletechnicalservices co uk 1600HV 3mm Tungsten carbide 20mm 86 147 75mm 1600HV 3mm Tungsten carbide 1600HV 3mm Tungsten carbide 1600HV 5mm Tungsten carbide 5000HV 3mm synthetic diamond 50g Max hardness of sample 940HV 940HV 1000HV 650HB 1200HV Mean roughness value 1 6um 1 6um 0 4um 6 3um 1 6um of sample surface Ra Min weight of sample Measure directly Need support firmly Need coupling tightly 0 05 2kg 0 05 2kg 0 02 0 5kg 5mm 5mm lmm 10mm 5mm gt 0 8mm gt 0 8mm gt 0 2mm gt 1 2mm gt 0 8mm Min thickness of sample Coupling tightly Min layer thickness for surface hardening Size of tip indentation Hardness Indentation 0 54mm 0 54mm 0 38mm 1 03mm 0 54mm 300HV diameter Depth of 24um 24um 12um 53um 24um indentation Hardness Indentation 0 54mm 0 54mm 0 32mm 0 90mm 0 54mm 600HV diameter Depth of 17um 17um sum 4 um 17um indentation Hardness Indentation 0 35mm 0 35mm 0 35mm 0 35mm SOOHV diameter Depth of 10um 10um 7um indentation FIS lt Lest est ln Speormnpat Test small light large super high device thin parts thick heavy hardness cy
8. d 10 PCE info tursdaletechnicalservices co uk 4 Testing Program 4 1 Start Up O Insert the plug of the impact device into the socket of impact device on the instrument O Press the amp key now power is on The instrument is in working mode 4 2 Loading Pushing the loading tube downwards until contact is felt Then allow it to slowly return to the starting position or using other method locking the impact body 4 3 Localization Press the impact device supporting ring firmly on the surface of the sample the impact direction should be vertical to the testing surface 4 4 Testing Press the release button on the upside of the impact device to test The sample and the impact device as well as the operator are all required to be stable now The action direction should pass the axis of the impact device Each measure area of the sample usually need 3 to 5 times of testing operation The result data dispersion should not more than mean value 15HL The distance between any two impact points or from the center of any impact point to the edge of testing sample should conform to the regulation of Table 4 1 If want accurate conversion from the Leeb hardness value to other hardness value contrastive test is needed to get conversion relations for the special material Use inspection qualified Leeb hardness tester and corresponding hardness tester to test at the same sample respectively For each hardness value each measu
9. e includes HL HV HB HRC HS HRB and HRA Note O Here only displays the valid hardness scale for the present selected impact device and material It would not display the hardness scale which ts not valid O Please select material firstly then select hardness scale O Presetting hardness scale recovers to HL automatically after presetting material is changed 5 4 Impact Direction Setting Press the CY key to move to the impact direction that you will preset 5 5 Average Times Setting You could modify average times within the range of 1 to 32 as following 1 Press 4 key in testing state The impact times item will begin to flash 2 Press e or e key to set the average times to the number you want Press J key finally to exit from the operation 14 info tursdaletechnicalservices co uk 5 6 Data logging At most one hundred files FOO F99 one group as one file can be stored inside the gauge By simply pressing the J key after a new measurement finishes the screen showing the AVE icon the measured hardness strength group values will be saved to memory The new saved file is appended as the last file of the memory This function provides the user with the ability to view delete a file group previously saved in memory 5 6 1 Viewing stored file Group To view the memory data follow the steps 1 Press the key to activate the data logging function The memory icon will appear It will display the current file nam
10. e the test parameter of the group data and the mean value of the group If there is no data in the memory it will display lt E04 gt which means no memory data and then return back 2 Use the e key and the Le key to select the desired file to view 3 Press the key to see details of that group data 4 Use the E key and the Le key to view each single measured data in that group while viewing details 5 Press the key to return to previous screen at any time during data logging 5 6 2 Deleting selected file Group The user may require deleting a file from the instrument memory The procedure 1s outlined in the following steps 1 Press the key to activate the data logging function The memory icon will appear It will display the current file name the test parameter of the group data and the mean value of the group If there is no data in the memory it will display lt E04 gt which means no memory data and then return back 2 Use the E key and the Le key to scroll to the file that will be deleted 3 Press the key on the desired file It will automatically delete the file and display DEL 4 Press the key at any time to exit the data logging function and return to measurement mode Note Do not shut down the instrument while deleting data It could lead to unpredicted consequence if shutting down while deleting 5 7 Print Function At the end of the inspection process or end of the day the use
11. ircuit integrated inside the instrument Continuous working period of no less than 150 hours EL off and no printing Auto power off to save energy Outline dimensions 212mmx80mmx32mm 1 2 Main Application amp Testing Range 1 2 1 Main Application Die cavity of molds Bearings and other parts Failure analysis of pressure vessel steam generator and other equipment Heavy work piece The installed machinery and permanently assembled parts Testing surface of a small hollow space Material identification in the warehouse of metallic materials Rapid testing in large range and multi measuring areas for large scale work piece 1 2 2 Testing Range Testing range refer to Table 1 and Table 2 in the Appendix info tursdaletechnicalservices co uk 1 3 Technical Specifications O Error and repeatability of displayed value see Tablel 1 below Table 1 1 Type of impact Hardness value of Leeb Error of displayed Ei standard hardness block value D iy 760 30HLD 6 HLD 6 HLD 530 40HLD 10 HLD 10 HLD 530 40HLDC 10 HLDC 10 HLD DESM MESE a CAE Measuring range HLD 170960 HLD Measuring direction 0 360 Hardness Scale HL HB HRB HRC HRA HV HS Display segment LCD Data memory 100 groups max relative to impact times 32 1 Printing paper width is 57 5 0 5 mm diameter is 30mm Battery pack 6V NI MH Battery charger 9V SOOmA Continuous working period about 150 hours With backlight off no printing Communicati
12. lindrical and y and material DL Testslen reentra surface of rough der narrow nt hardened surface roove or surfac layer steel ole e 21 3 info tursdaletechnicalservices co uk Table 4 No Type Sketch of non Remarks conventional Supporting ring 1 710 15 For testing cylindrical outside surface R10 R15 2 714 5 30 For testing cylindrical outside surface R14 5 R30 3 725 50 For testing cylindrical outside surface R25 R50 For testing cylindrical inside surface R11 R13 For testing cylindrical inside surface R12 5 R17 HZ12 5 17 HZ16 5 30 For testing cylindrical inside surface R16 5 R30 7 K10 15 For testing spherical outside Tye surface SR10 SRIS5 GZ For testing spherical outside 4 HZ11 13 K14 5 30 surface SR14 5 SR30 For testing spherical inside surface SR11 SR13 For testing spherical inside surface SR12 5 SR17 For testing spherical inside surface SR16 5 SR30 HK 11 13 10 HK12 5 17 HK16 5 30 For testing cylindrical outside pu MN surface radius adjustable R10 oo ERDONA KANDER In this direction will find a vision of the measurement technique http www industrial needs com measuring instruments htm NOTE This instrument doesn t have ATEX protection so it should not be used in potentially explosive atmospheres powder flammable gases 22
13. ng materials Steel and Cast Steel Cold Work Tool Steel Stainless Steel Gray Cast Iron Nodular Cast Iron Cast Aluminum Alloys Copper Zinc Alloys Copper Aluminum Alloys Wrought Copper and Wrought Steel The relationship between the material number displayed on the instrument screen and the material is as follows Table 5 1 0 Steel and cast steel Cast aluminum alloys 1 Cold work tool steel 6 Copper Zinc alloys 2 i Stainless steel 7 Copper Aluminum alloys 3 Gray castiron 8 Wroughtcopper 4 Nodularcastiron 9 Wrought steel 13 info tursdaletechnicalservices co uk In strength testing the following materials are selectable Mild Steel High Carbon Steel Cr Steel Cr V Steel Cr Ni Steel Cr Mo Steel Cr Ni Mo Steel Cr Mn Si Steel Super Strength Steel and Stainless Steel The relationship between the material number displayed on the instrument screen and the material is as follows Table 52 O Mild steel AA 1 Highcarbonsteel 6 CrNi Mo steel 22 Crsel CrMnSistel Cr V steel 8 Super strength steel I CeNistel Jo Stainless stee 5 3 Hardness Strength testing Press key to switch between hardness testing and strength testing 6b Note Only D and DC type of impact device has the function of strength testing So hardness testing is the only selection if the impact device is not D or DC type In hardness testing Press key to change the hardness scale The supported hardness scal
14. ompartment Make sure that the paper is well in place and close the paper compartment cover 5 12 Battery Charge The instrument uses a NI MH battery pack as 1ts power source When the battery pack almost runs out the battery symbol on the display will glint It needs charging as soon as possible Try to drain your battery pack as fully as possible before it 1s charged for longest battery service 16 info tursdaletechnicalservices co uk O The battery switch should be at ON condition before charging O Plug the power adapter into the mains supply power socket and then plug the charger connector into the power jack of the instrument If the instrument is in power off condition it will turns on automatically after the charger plug is inserted into the power jack The battery symbol will alternately shows between and 1_E when charging The more of the dark part indicates the more close to full capacity O When the battery is fully charged the battery symbol on the display will glint Please use the configured AC DC adapter to charge the battery pack Warning When the battery pack is being charged printing or paper feeding is unavailable 5 13 Battery Replacement When the battery pack fails to be charged the user should replace the batteries following the program below Power down the instrument Take off the battery compartment cover and take out the battery pack Insert the connection plug of the new battery
15. on interface USB1 1 info tursdaletechnicalservices co uk 1 4 Configuration Table 1 2 po No Item Quantity Remarks _ Standard 1 Mainunit ls Configuration 3 Standard testblock____ l____ __________ 4 Cleaning brush I ____ l___ ________ 5 Smallsupportring LP 6 BatteryCharger_____ l 9 S00MA 7 Paperforprinting LP 8 Manual SS 9 Instrument package case SS Optional 11 Cleaning brush II Configuration For use with G type impact device DataPro software E d6 S Other type of impact a Refer to Table 3 devices and support and Table 4 in the rings IX AAA 1 5 Working Conditions Working temperature 10 gt w50 Storage temperature 30 60 Relative humidity lt 90 The surrounding environment should avoid of vibration strong magnetic field corrosive medium and heavy dust 1 6 Safety Instructions O The instrument can only work with the specially designed battery pack and power adapter charger supplied by Mitech Co LTD Working with others may result in damage of the instrument battery leakage fire or even explosion O Do not cast the battery pack into fire and do not short circuit disassemble or heat the battery pack otherwise battery leakage fire or even explosion may occur Do not open the cover of the paper compartment or come into contact with the heating head of the printer by hand or any part of your body to avoid burns due to high temperature when the printer 1s
16. pack into the socket on the circuit board Reset the battery cover Turn on the instrument to check Warning Please pay much attention to the polarity of the battery during battery replacement 5 14 Connecting to a Computer Insert one connection plug of the transmission cable into the USB socket on the right side of main body and insert the another plug into the USB port on the back of computer box Refer to the manual of the DataPro software for detailed information 5 15 Error Code Reference Battery exhausted Value out of range Battery Charging Measurement not finished No paper for printing Data already saved E04 Nomemorydata BOOP 6 Maintenance amp Servicing 6 1 Impact Device Maintenance Oo After the impact device has been used for 1000 2000 times please use the nylon brush provided to clean the guide tube and impact body When cleaning the guide tube unscrew the support ring first then take out the impact body spiral the nylon brush in counter clock direction into the bottom of guide tube and take it out for 5 times and then install the impact body and support ring again O Release the impact body after use O Any lubricant is absolutely prohibited inside the impact device 17 info tursdaletechnicalservices co uk 6 2 Instrument Maintenance Program O When using standard Rockwell hardness block to testing if all the error is bigger than 2 HRC it may be the invalidation of impacted ball top caused by ab
17. r may require the readings be printed You can print out the measurement result immediately after each testing process by easily pressing the key If you want to print the data stored in the instrument memory then following is the steps 1 Press the key to activate the data logging function The memory icon will appear 2 Use the key and the Le key to select the desired file 3 Press the key to print the selected file This operation will print out all the data in current file 4 Press the key to exit the data logging functions and return to measurement mode Note O Printing function is unavailable while charging O Printing can be stopped by pressing the E key Oo Do not open the cover of the paper compartment during printing Otherwise the instrument may not print normally Oo Over high ambient humidity above 85 of relative humidity or over low ambient humidity below 20 of relative humidity may reduce the print quality O Printing with paper that has been stored for over long period of time or of poor quality may 15 info tursdaletechnicalservices co uk reduce the print quality or even damage the printer When the printer is powered on and ready for printing press U key then the instrument will start manual paper feeding Press and keep holding the key to start paper feeding while releasing the key to stop paper feeding Note Manual paper feeding is unavailable while charging 5 8 System Reset
18. rasion Changing the spherical test tip or impact object should be considered O When the hardness tester appears some other abnormal phenomena please do not dismantle or adjust any fixedly assembled parts Fill in and present the warranty card to us The warranty service can be carried on 6 3 Fault Analysis amp Evacuation Fault Appearance Fault Analysis Handling method Battery failure Replace the battery with Charge failure a new pack 6 4 Notice of Transport and Storage Conditions O Keep it away from vibration strong magnetic field corrosive medium dumpiness and dust Storage in ordinary temperature O With original packing transport is allowed on the third grade highway 18 PGE info tursdaletechnicalservices co uk APPENDIX Table 1 Material Method E gt DDC Ea Pp 193 67 20 ETE o me a HRB al 99 gt 99 sa 99 steel ar 05 30 638 80 683 90 646 83 663 81 646 l a eaaa ae HS 32 2 99 33 3 99 31 8 10 35 8 102 30 6 96 5 3 2 1 6 8 20 4 67 19 8 68 20 7 68 oe EI 46 5 10 ASA Pd IS O E up es s O o o oo wv so IR IE IE IE Grev castiron PRE T T S S HB 93 334 92 326 meet oe STD fem 1ron alsa saasa Cast aluminum BRASS copper mon EA mid m P AA E E BRONZE copp er aluminum tin 60 290 alloys Wrought copper 45 315 alloys 19 info tursdaletechnicalservices co uk CA NN Cr Mn Si steel 500 750 755 1993 NN Super strength steel 630
19. re homogeneously 5 points of Leeb hardness value in the surrounding of more than three indentations which need conversion hardness using Leeb hardness arithmetic average value and corresponding hardness average value as correlative value respectively make individual hardness contrastive curve Contrastive curve at least should include three group of correlative data 11 info tursdaletechnicalservices co uk Table 4 1 Type of Impact Distance of center of the Device indentation to sample edge Not less than mm 5 4 5 Read Measured Value After each impact operation the LCD will display the current measured value impact times plus one the buzzer would alert a long howl if the measured value is not within the valid range When reaching the presetting impact times the buzzer will alert a long howl After 2 seconds the buzzer will alert a short howl and display the mean measured value 4 6 Notification O Replacing the impact device must be done during Power off Otherwise the main body could not identify the type of the impact device and it may damage the circuit board of the main body O You could not save the current test value if the impact time is less than the presetting times value O Only type D and type DC of impact device have the function of strength test option You can not change the setting to strength testing when using other types of impact device The setting would be set to hardness testing automatically after
20. surface of sample should be avoided Too big roughness of the being measured surface could cause error So the surface of the sample to be measured must appear metallic luster smoothing and polish without oil stain Support of test sample Support is no necessary for heavy sample Medium weight parts must be set on the smoothing and stable plane The sample must set absolutely equability and without any wobble Curved surface The best testing surface of sample is flat When the curvature radius R of the surface to be tested is smaller than 30mm D DC D 15 C E and DL type of impact device and smaller than 50mm G type of impact device the small support ring or the shaped support rings should be chosen The sample should have enough thickness minimum thickness of sample should conform to Table 3 For the sample with hardened layer on surface the depth of hardened layer should conform to Table 3 R Coupling Light 2 5 cemaper aave vo ay epa With a heavy base plate Both coupled surface must be flat and smooth and there is no redundant coupling agent existing The impact direction must be vertical to the coupled surface When the sample is a big plate long rod or bending piece it can be deformed and become unstable even though its weight and thickness is big enough and accordingly the test value may not be accurate So the sample should be reinforced or supported at its back Magnetism of the sample itself should be avoide
21. tem Reset 16 5 9 EL Backlight 16 5 10 Auto Power Off 16 5 11 Paper Installation 16 5 12 Battery Charge 16 info tursdaletechnicalservices co uk 5 13 Battery Replacement 17 5 14 Connecting to a Computer 17 5 15 Error Code Reference 17 6 Maintenance amp Servicing 17 6 1 Impact Device Maintenance 17 6 2 Instrument Maintenance Program 18 6 3 Fault Analysis amp Evacuation 18 6 4 Notice of Transport and Storage Conditions 18 APPENDIX 19 Table 1 19 Table 2 20 Table 3 21 Table 4 22 info tursdaletechnicalservices co uk 1 Overview 1 1 Advantages Wide measuring range Based on the principle of Leeb hardness testing theory It can measure the Leeb hardness of all metallic materials Large screen LCD showing all functions and parameters With EL background light Seven impact devices are available for special application Automatically identify the type of impact devices Test at any angle even upside down Direct display of hardness scales HRB HRC HV HB HS HL Large memory could store 100 groups Relative to average times 32 1 information including single measured value mean value impact direction impact times material and hardness scale etc Battery information showing the rest capacity of the battery and the charge status User calibration function Software to connect to PC via USB port Thermal printer integrated convenient for in field printing NI MH rechargeable battery as the power source Charge c
22. the impact times value will plus or minus when pressing the E or E key Press key finally to exit from changing the impact times process Oo Press key to change the hardness scale O Press key to change the material Presetting hardness scale recovers to HL automatically after material presetting changed O Press ES key to switch between hardness test and strength test Only D and DC type of impact device has the function of strength testing So hardness testing is the only selection if the impact device is not D or DC type info tursdaletechnicalservices co uk O Press key to print out the measured values after measurement O Press L key to manually feed the paper 2 4 Leeb Hardness Testing Principle The basic principle is to use an impact body of certain weight impacts against the testing surface under certain test force then measure the impacting velocity and the rebounding velocity of the impact body respectively when the spherically test tip is located Imm above the testing surface The calculation formula is as follows HL 1000xVB VA Where HL Leeb hardness value VB Rebounding velocity of the impact body VA Impacting velocity of the impact body 3 Preparation 3 1 Instrument Preparation and Inspection Verification of the instrument is by using standard test block The error and repeatability of displayed value should be within the regulation of Appendix table 2 The instrument and impact device must be
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