MH320 Portable Leeb Hardness Tester

Application conditions l  Surface temperature can’t be overheat less than 120° l  Surface roughness should not to be too large, otherwise it will cause errors. The surface of the work piece must be exposed metallic luster, smoothing and polish without Oil l  The specimens with 2-5kg or thin walled specimens overhangs should be supported with some object in order to avoid the specimen deformation ,bending and movement  caused by impact       for medium-sized work piece ,it shall be placed on a flat and hard surface, the sample must be placed absolutely smoothly,without any shake, for heavy samples more than 5kg, it can be measured dire without any support. l  Portable Leeb hardness tester has strict requirements for sample thickness , the minimum thickness shall comply with regulatory a(see instructions). l  For work piece with hardened layer on surface,the depth of hardened layer should conform to regulatory l  For lighter parts, please make it tightly coupled with support ,two coupled surface layer should must be conform flat and to smooth,  the coupling gel should not to be too much. The direction of the test shall be perpendicular  to the coupling plate; if the work piece is a large plate, pole or bending material , even the weight and thickness is okay ,it may still cause deformation and instability, resulting in test values error, it should be reinforced or supported at the back of the test points. l  Magnetic of work piece should be less than 30 gauss. l  For artifact-surface : The work piece surface is preferably flat. When the curvature radius R of measured surface is less than 30mm, pieces should be tested with the small support ring the shaped support rings. Technical Specifications Error and repeatability of displayed value showed in Table below. No. Type of impact device Hardness value of Leeb standard hardness block Error of displayed value Repeatability 1 D 760±30HLD 530±40HLD ±6 HLD ±10 HLD 6 HLD 10 HLD 2 DC 760±30HLDC 530±40HLDC ±6 HLDC ±10 HLDC 6 HLD 10 HLD 3 DL 878±30HLDL 736±40HLDL ±12 HLDL 12 HLDL 4 D+15 766±30HLD+15 544±40HLD+15 ±12 HLD+15 12 HLD+15 5 G 590±40HLG 500±40HLG ±12 HLG 12 HLG 6 E 725±30HLE 508±40HLE ±12 HLE 12 HLE 7 C 822±30HLC 590±40HLC ±12 HLC 12 HLC   l  Measuring range：HLD（170～960）HLD l  Impact direction: vertically downward, oblique, horizontal, vertical upward, automatically identify l  Material: steel and cast steel，cold work tool steel, stainless steel, Grey cast iron,Nodular cast iron, cast aluminum alloys,BRASS(copper-zinc alloys),BRONZE(copper-aluminum/tin alloys),Wrought copper alloys l  Hardness Scale：HL、HB、HRB、HRC、HRA、HV、HS l  Paper Roll: Width (57.5±0.5)mm, diameter: 30mm, imported paper to ensure long-term data storage l  Display：128X64 dots,adjustable backlight l  Data memory：500 measurement series.(relative to impact times 32～1) l  Battery : 6V,(Ni-MH battery pack) l  Power Supply: 9V/500mA l  Recharge Time: 2.5~3.5hours l  Standby Time: About 150hours (with default brightness) l  Communication interface：USB1.1