The DLH-500 is a simple to use and ruggedly built hardness tester. It easily fits in your hand and is well protected by the black rubber boot included with the instrument. The large, bright color screen is sharp and supports multiple interface views, and displays Leeb + 2 Hardness Conversions on one screen. Results can be stored and sent to a PC at a later time with the communication software.
Features Graphing with Hi/Lo Tolerances:
A spring in the probe projects the tungsten carbide ball tipped indenter at the test piece. Impact velocity is measured immediately prior to impact and then on rebound. The quotient is computed and displayed as the Leeb Hardness Value. On hard materials, the rebound velocity will be higher than that from softer materials, which will absorb more of the impact energy.
For a correct and repeatable measurement, certain conditions must be met:
The test piece surface needs preparation by filing, sanding or grinding. As a general rule, if you drag your thumbnail across the surface and it drags, the surface is too rough.
Materials such as cast iron, that have a coarse (large) grain structure, will cause inconsistent measurements. The use of a much larger indenter "G" probe will often correct for this condition.
Test parts that have a low mass or thickness, need to be supported to prevent movement or deflection.
Selection of the material corrects for material type. The following materials can be selected: Steel / Cast Steel, Gray Cast Iron, Nodular Cast Iron, Cast Aluminum, Brass, Bronze, Copper, Stainless Steel, Forged Steel and Tool Steel*
*Leeb measurements are affected by the materials elasticity. To a large degree this is taken care of by selecting the most similar material type from the Material list. If you find that your measurements are a bit high or low, it is because the built-in correction factor does not match your material. You can try a different material to see if this gets you closer to a correct measurement. You can also use a known hardness sample of your test material (having enough mass and thickness) to determine the +/- error and then adjust the reading to match using the Calibration facility.
Set; Up, Down, Sideways, 45° up or 45° down
The DLH-500 is supplied with a type "D" General Purpose Probe. It can be used with types: D, DC, DL, C, D+15, E and G. The DLH-500 is compatible with most manufacturers' probes including EquoTip.
| Display | High-Definition 2.4" IPS Display |
| Measuring Method | Leeb Hardness Testing Method,Impact Type |
| Hardness Scale | HL, HB, HRB, HRC, HV, HS, Strength (σb) |
| Measuring Range | HLD（200-960） HRC（19.8-68.5）HRB（13.5-100） HB（30-651）HV（80-976） HS（26.4-99.5）σb（375-2639) |
| Impact Devices | D type impact device (Standard); Interchangeable D/DC/DL type impact device (Optional) |
| Accuracy | Measuring Error:±6HLD (HLD=800), Repeatability:±6HLD (HLD=800) |
| Measuring Direction | 360 degree |
| Material | Steel & Cast Steel, Stainless Steel, GC IRON, NC IRON, Cast Aluminum alloy, Copper-zinc alloy, Copper-tin alloy, Brass, Forged Steel, Alloy Tool Steel |
| Resolution | 1HL，1HV，1HB，0.1HRB，0.1HRC，0.1HS |
| Language | Multiple languages |
| Software | Standard LmView software, for management, archiving and printing the measurement data |
| Power | Two Alkaline battery |
| Data Memory | 200 Files, 11000 Groups (each group includes 1-8 testing values and 1 average value) |
| Temperature | -10℃~ +50℃ |
| Size | 153mm×76mm×37mm（H×W×D) |
| Weight | 280g include batteries |
| Standard | GB/T 17394-1998,ASTM A956 |
