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1、MH210 Leeb Hardness TesterUsers Manual1 Overview31.1 MH210 Advantages31.2 Main Application &Testing Range31.2.1 Main Application31.2.2 Testing Range31.3 Configuration41.4 Working Conditions42 Structure Feature &Testing Principle52.1 Structure Feature52.1.1 The Hardness Tester Appearance52.1.2 Parts
2、of the Main body52.1.3 D Type Impact Device62.1.4 Different Types of Impact Device62.2 Leeb Hardness Testing Principle63 Technical Specifications74 Preparation & Testing84.1 Preparation & Inspection before Testing84.1.1Preparation of Sample Surface84.1.2 System Setting84.1.3Presetting Testing condit
3、ion94.2 Testing Program94.2.1 Start-Up94.2.2 Loading94.2.3 Localization94.2.4 Testing94.2.5 Read measured value104.2.6 Power Off105 Advice116 Operation in Details126.1 Power On126.2 Power Off126.3 Testing126.3.1 Instruction of the Main Display Interface126.3.2 Testing Operation at the Main Display I
4、nterface136.3.3 Key Operation at the Main Display Interface136.4 Menu Structure146.5 Test Set146.5.1 Impact Direction Setting156.5.2 Average Times Setting156.5.3 Material Setting156.5.4 Hardness Scale Setting166.5.5 Tolerance Limit Setting176.5.6 Hardness/b Setting176.6 Print Set176.7. Memory Manage
5、r176.7.1 View from No.1 Group/View from Ending Group186.7.2 View from Selected No. Group186.7.3 Data Transfer186.7.4 Delete by Group No.186.7.5 Delete All Data196.7.6 Deletion Confirmation196.8 Browsing Memory Data Groups196.9 System Set206.9.1 LCD Brightness Set216.9.2 Time Date Set216.10 Software
6、Information216.11 System Calibration226.12 EL Background Light226.13 Auto Power Off236.14 Battery Replacing236.15 Connection of Data Transmission Cable237 Fault Analysis & Evacuation248 Servicing & Maintenance248.1 Impact Device Servicing248.2 Normal Maintenance Program249 Calibration2410 Notice of
7、Transport and Storage Conditions24APPENDIX25Table 125Table 226Table 327Table 4281 Overview1.1 MH210 Advantagesl Wide measuring range. Based on the principle of Leeb hardness testing theory. It can measure the Leeb hardness of all metallic materials.l Large screen(12864 dot matrix LCD), showing all f
8、unctions and parameters.l Test at any angle, even upside down.l With EL background lightl Direct display of hardness scales HRB, HRC, HV, HB, HS, HLl Seven impact devices are available for special application. Automatically identify the type of impact devices. l Large capacity memory could store 500
9、 groups (Relative to average times321 ) information including single measured value, mean value, testing date, impact direction, impact times, material and hardness scale etc. l Upper and lower limit can be preset. It will alarm automatically when the result value exceeding the limit. l Battery info
10、rmation indicates the rest capacity of the battery.l Software calibration function.l Software to connect with PC via RS232 port. Micro printer support.l Compact metal case，suitable for use under poor working conditionsl Continuous working period of no less than 50 hours with two alkaline batteries(A
11、A size)；Auto power off to save energy.l Outline dimensions：132 X 76.2 *30mml Weight：345g1.2 Main Application &Testing Range1.2.1 Main Applicationl Die cavity of moldsl Bearings and other partsl Failure analysis of pressure vessel, steam generator and other equipmentl Heavy work piecel The installed
12、machinery and permanently assembled parts.l Testing surface of a small hollow spacel Material identification in the warehouse of metallic materialsl Rapid testing in large range and multi-measuring areas for large-scale work piece1.2.2 Testing RangeTesting range refer to Table 1 and Table 2 in the A
13、ppendix.1.3 ConfigurationTable 1-1No.ItemQuantityRemarksStandard Configuration1Main body1 2D type impact device1 With cable3Standard test block1 4Cleaning brush (I)15Small support ring16Alkaline battery2AA size7Manual18Instrument case19Optional Configuration11Cleaning brush (II)1For use with G type
14、impact device12Other type of impact devices and support ringsRefer to Table 3 and Table 4 in the appendix.13DataPro software114Communication cable115Micro Printer116Print cable11.4 Working ConditionsWorking temperature： 040；Storage temperature：-3060Relative humidity: 90；The surrounding environment s
15、hould avoid of vibration, strong magnetic field, corrosive medium and heavy dust. 2 Structure Feature &Testing Principle2.1 Structure Feature2.1.1 The Hardness Tester Appearance1. Main body 2. Impact device2.1.2 Parts of the Main body1 Socket of RS232 2 Aluminium case 3 Belt hole 4 Battery cover 5 K
16、eypad 6 LCD display 7 Socket of impact device 8 Aluminium case 9 Label 2.1.3 D Type Impact Device 1 2 3 4 5 6 71 Release button 2 Loading tube 3 Guide tube 4 Coil unit 5 Connection cable 6 Impact body 7 Support ring2.1.4 Different Types of Impact Device DC DL C D+15 E G2.2 Leeb Hardness Testing Prin
17、cipleThe 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 1mm above the testing surface.Th
18、e calculation formula is as follows: HL=1000VB/ VAWhere,HL Leeb hardness valueVB Rebounding velocity of the impact bodyVA Impacting velocity of the impact body3 Technical Specificationsl Error and repeatability of displayed value see Table 3-1.Table 3-1No.Type of impact deviceHardness value of Leeb
19、standard hardness blockError of displayed valueRepeatability1D76030HLD53040HLD6 HLD10 HLD6 HLD10 HLD2DC76030HLDC53040HLDC6 HLDC10 HLDC6 HLD10 HLD3DL87830HLDL73640HLDL12 HLDL12 HLDL4D+1576630HLD+1554440HLD+1512 HLD+1512 HLD+155G59040HLG 50040HLG 12 HLG 12 HLG6E72530HLE50840HLE12 HLE12 HLE7C82230HLC59
20、040HLC12 HLC12 HLCl Measuring range：HLD（170960）HLDl Measuring direction：360l Hardness Scale：HL、HB、HRB、HRC、HRA、HV、HSl Display：dot matrix LCD，12864 dotsl Data memory：max. 500 groups（relative to impact times 321）l Working voltage：3V（2 AA size alkaline battery）l Continuous working period：about 100 hours
21、（With backlight off）l Communication interface：RS2324 Preparation & Testing4.1 Preparation & Inspection before Testing4.1.1Preparation of Sample SurfacePreparation for sample surface should conform to the relative requirement in the Appendix Table 3.l In the preparation processing for sample surface,
22、 the hardness effect of being heated or cold processing on the surface of sample should be avoided. l Too big roughness of the being measured surface could cause measure error. So, the surface of the sample to be measured must appear metallic luster, smoothing and polish, without oil stain.l Support
23、 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.l Curved surface: The best testing surface of sample is flat. When the curvature radius R of the surface to b
24、e 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.l The sample should have enough thickness, minimum thickness of sample should conform to Table 3.l For th
25、e sample with hardened layer on surface, the depth of hardened layer should conform to Table 3.l Coupling. Light-weight sample must be firmly coupled 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
26、 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. l
27、 Magnetism of the sample itself should be avoided4.1.2 System SettingSee 6.9 for details.4.1.3Presetting Testing conditionSee 6.5 for details.4.2 Testing ProgramNote：Use a calibrated hardness tester, test the standard test block downward vertically for 5 times, the arithmetical average value compare
28、 with the value of standard test block. If this value exceeds the standard value, could use the function of software calibration to adjusting.Verification of the tester is by using standard test block. The error and repeatability of displayed value should be within the regulation of Appendix table 2
29、. 4.2.1 Start-Upl Insert the plug of the impact device into the socket of impact device on the tester.l Press【】key，now power is connected. The instrument is in testing condition.4.2.2 LoadingPushing the loading-tube downwards until contact is felt. Then allow it to slowly return to the starting posi
30、tion or using other method locking the impact body. 4.2.3 LocalizationPress the impact device supporting ring on the surface of the sample firmly, the impact direction should be vertical to the testing surface. 4.2.4 Testingl Press the release button on the upside of the impact device to test. The s
31、ample 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.l Each measure area of the sample usually need 5 times of testing operation. The result data dispersion should not more than mean value15HL。l The dist
32、ance 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.l If want accurate conversion from the Leeb hardness value to other hardness value, contrastive test is needed to get conversion relations for the spe
33、cial material. Use inspection qualified Leeb hardness tester and corresponding hardness tester to test at the same sample respectively. For each hardness value, each measure homogeneously 5 points of Leeb hardness value in the surrounding of more than three indentations which need conversion hardnes
34、s, 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. Table 4-1Type of Impact DeviceDistance of center of the t
35、wo indentationsDistance of center of the indentation to sample edgeNot less than (mm)Not less than (mm)D、DC35DL35D+1535G48E35C244.2.5 Read measured value4.2.6 Power OffPress【】key to switch off.5 Advicel Replacing the impact device must be done during Power off. Otherwise the main body can not identi
36、fy the type of the impact device, and it can damage the circuit board of the main body.l You could not save the current test value if the test times is less than the presetting times value. But you could press 【AVG】to end the test process in advance if you want to save the values.l When pressing 【AV
37、G】 to end testing in advance，the 【Auto save】, 【Auto transfer】settings could not work.l Only type D and type DC of impact device have the function of strength measure option. You can not modify the 【Set hardness orb】setting when using other types of impact device. The 【Set hardness orb】setting would
38、be set to 【Hardness】 automatically after replacing the impact device whether the setting is 【Hardness】 or not before. l Not all materials could convert to all hardness style value. The hardness style is reset to HL automatically after changing the material. So select material first before changing t
39、he hardness style. 6 Operation in Details6.1 Power OnPress【】 to power on the system. The screen shows as below：MH210HARDNESS TESTER Mitech Inc.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 atten
40、tion to the probe type displayed on the screen. After pausing for several second, the screen will exit and enter the main display interface.6.2 Power OffPress key【】 could power off the system in any conditions.6.3 TestingBelow is the main display interface：Average value indicatorHardness scaleMeasur
41、ed valueBattery informationImpact directionTimes countMaterial6.3.1 Instruction of the Main Display InterfaceBattery information：Display the information of the rest capacity of the battery.Impact direction：The present impact direction.Average value indicator：It appears to show the mean value of the
42、samples when reaching the presetting impact times.Hardness scale：Hardness method of the present measured value.Measured value：Display present single time measured value（without mean value indicator）， or display the present mean value (with average value indicator prompting). means over conversion or
43、 measure range. means lower than conversion or measure range.Material：The present presetting material.Impact times count： Times that have been impacted. 6.3.2 Testing Operation at the Main Display InterfaceTesting operation could be carried out under this interface. After each impact operation, it c
44、an display the current measured value, impact times count plus one, the buzzer would alert a long howl if the measured value is not within the tolerance limit. When reaching the presetting impact times, the buzzer will alert a long howl. After 2 seconds, the buzzer will alert a short howl, and displ
45、ay the mean value.6.3.3 Key Operation at the Main Display Interfacel Press key【SAVE】to store present group of measured value into memory. This operation is only valid after displaying the mean value.l Press key 【DEL】to delete the latest single measured value. After pressing this key, the screen will
46、 displays as below: -Confirm delete？- NOPress key【 】 or key 【 】to move the cursor to【YES】or【NO】.YESPress key【ETR】 to confirm operation. Press key【ESC】to cancel delete operation.l Press key【】or【】 could display single measured value.l Press key【AVG】 could end off testing while not reaching the presetting impact times, and display t
