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Summary of Contents for Starrett 3811A
- Page 1 The L.S. Starrett Company 121 Crescent St. Athol, MA 01331 TECHNICAL SUPPORT: (201) 962-8352 Model No. 3811A Operation Manual...
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Page 2: Table Of Contents
1 Overview 1.1 Advantages 1.2 Main Application &Testing Range ..............4 1.2.1 Main Application ....................4 1.2.2 Testing Range......................4 1.3 Technical Specifications ..................4 1.4 Configuration ......................6 1.5 Working Conditions ....................7 2 Structure Feature &Testing Principle 2.1 Structure Feature ..................... 7 2.1.1 D Type Impact Device .................. - Page 3 5.13 Error Code Reference ....................19 6 Maintenance & Servicing 6.1 Impact Device Maintenance ................19 6.2 Instrument Maintenance Program ..............20 6.3 Fault Analysis & Evaluation ................20 6.4 Notice of Transport and Storage Conditions APPENDIX ..........................20 Table 1 ..........................18 Table 2 ..........................
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Page 4: Overview
1 Overview 1.1 Advantages • Wide measuring range. Based on the principle of Leeb hardness testing theory. Capable of measuring Leeb hardness of all metallic materials. • Large screen LCD, showing all functions and parameters. With background light. • Seven impact devices are available for special application. Automatic identification of impact device upon plug in. - Page 5 Table 1-1 Type of Hardness value of Error of Repeatabilit impact Leeb standard displayed device hardness block value 760±30HLD ±6 HLD 6 HLD 530±40HLD ±10 HLD 10 HLD 760±30HLDC ±6 HLDC 6 HLD 530±40HLDC ±10 HLDC 10 HLD 878±30HLDL ±12 HLDL 12 HLDL 736±40HLDL 766±30HLD+15...
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Page 6: Configuration
Item Quantity Remarks Standard Main unit Configuration type impact With cable device Standard test block Cleaning brush (I) Small support ring Alkaline battery AA size Manual Instrument package case Optional Cleaning brush (II) For use with G type Configuration impact device Other type of impact Refer to Table 3 and devices and support... -
Page 7: Working Conditions
Communication cable Print cable 1.4 Configuration Table 1-2 1.5 Working Conditions Working temperature： 0℃～＋40℃； Storage temperature：-30℃～＋60℃ Relative humidity: ≤90％； The surrounding environment should be void any vibration, strong magnetic field, viscous fluids, corrosive medium and heavy dust. 2 Structure Feature &Testing Principle 2.1 Structure Feature HARDNESS GAUGE POWER:... -
Page 8: D Type Impact Device
Port for impact device 6. Impact device 7 Label 8. Battery cover 2.1.1 D Type Impact Device 1 Release button 2 Loading tube 3 Guide tube 4 Coil unit 5 Connection cable 6 Impact body 7 Support ring... -
Page 9: Different Types Of Impact Device
2.1.2 Different Types of Impact Devices D+15 2.2 Main Screen Below is the main display screen： Average Memory Icon Icon Battery Info Measured Hardness Scale Value Impact Times Direction Material No... -
Page 10: Keypad Definitions
Instruction of the Main Display Screen: Material The present presetting material. ： Impact direction The present impact direction. ： Hardness scale Hardness scale of the present measured value. ： Battery information Shows remaining battery capacity ： Measured value Display present single time measured value without showing ：... -
Page 11: Leeb Hardness Testing Principle
• Press key to store present group of measured value into memory. This operation is only valid after displaying the mean value. • Press key could display single measured value. • Press key could switch on or off the background light of LCD. •... -
Page 12: Preparation
3 Preparation 3.1 Instrument Preparation and Inspection Calibration of the instrument is performed by using a standard calibrated test block. The error and repeatability of displayed value should be within +/-6HL points (D device) The instrument and impact device must be calibrated using a standard hardness block prior to first usage or having reset the instrument system. -
Page 13: Preparation Of The Sample Surface
3.3 Preparation of the Sample Surface Preparation for sample surface should conform to the relative requirement in Appendix Table 3. • Test surfaces should be at or close to room temperature for optimal performance • To eliminate hardness errors resulting from the roughness of a sample’s surface when using impact device D, DC or D+15, the test surface should be ... -
Page 14: Testing Program
4 Testing Program 4.1 Start-Up • Insert the plug of the impact device into the socket of impact device on the instrument. • Press the key to power the unit on. The instrument ready for testing. 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. -
Page 15: Read Measured Value
Type of Distance of center of the Distance of center of the Impact Device two indentations indentation to sample edge Not less than (mm) Not less than (mm) D、DC D+15 4.5 Read Measured Value After each impact (test), the LCD will display the current measured value, impact times plus one and a beep will alert you if the measured value is not within the valid range. -
Page 16: Material Setting
The instrument can be turned off by pressing the key. The hardness tester has memory that retains all of its settings even when the power is off. 5.2 Material Setting Press key to change the material to the one you want to preset. Hardness scale defaults to HL automatically after material presetting changed. -
Page 17: Hardness/Strength Testing
5.3 Hardness/Strength testing Press key to switch between hardness testing and strength testing (бb). 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 main screen, Press key to change the hardness scale. -
Page 18: Clearing Selected File/Group
4) Use the key and the 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 is outlined in the following steps. -
Page 19: Auto Power Off
5.11 Battery Replacement The 3811A uses standard AA batteries. After several hours of usage, the battery symbol on the screen will begin to show less dark tabs which is shown as When the batteries are drained, the battery symbol will be shown as and will begin to flash. -
Page 20: Instrument Maintenance Program
• 6.2 Instrument Maintenance Program • When testing in the Rockwell C hardness scale your error amount should not exceed 2 Rockwell C points. Changing the spherical test tip or impact body should be considered. • Warranty will be VOID if unit has been dismantled by someone other than an authorized repair person 6.3 Fault Analysis &... - Page 21 85～80 Grey cast 93～33 92～32 iron Nodular 131～3 127～3 cast iron 19～16 23～21 32～16 Cast aluminu 23.8～8 22.7～8 23.8～8 m alloys 40～17 BRASS(co pper-zinc alloys) 13.5～9 BRONZE( copper- 60～29 aluminu m/tin alloys) Wrought 45～31 copper alloys...
- Page 22 Table 2: Leeb to Tensile Strength Conversion Chart: This is an Approximation only! Material Strength σ (MPa) Mild steel 350～522 374～780 High-Carbon steel 500～710 737～1670 Cr steel 500～730 707～1829 Cr-V steel 500～750 704～1980 Cr-Ni steel 500～750 763～2007 Cr-Mo steel 500～738 721～1875 Cr-Ni-Mo steel 540～738...
- Page 23 Table 3 Type of impact device DC(D)/D D+15 Impacting energy 11mJ 11mJ 2.7mJ 90mJ Mass of impact body 5.5g/7.2 7.8g 3.0g 20.0g Test tip hardness: 1600HV 1600HV 1600HV 1600HV Dia. Test tip: Material of test tip: Tungsten Tungsten Tungsten Tungsten carbide carbide carbide...
- Page 24 Optional 12pc Support Ring Set Part No. S38R For use on convex and concave parts...
- Page 25 3811A Data Output Software Installation: Insert CD into drive on your computer Window will pop up Run AutoRun.exe Follow prompts to load program, make sure your designation drive is set to C: Once completed a “Datapro for Hardness icon will...
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