© PCE Instruments
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Features
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128*64 OLED display;
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Micro USB storage device can be connected directly;
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Memory for 600 average values and 6 files;
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Limit alarm;
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Auto Power Off when battery is low;
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Easy-to-read display, clear digits
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Rechargeable Li-Ion battery
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Applications: ball bearings and other parts, fault analysis of pressure vessels, steam
turbine generators and plants, heavy workpieces, mechanical and permanently
installed parts, limited space
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Delivery contents
1 x hardness tester PCE-2500N or PCE-2600N
1 x charging cable
1 x test block
1 x cleaning brush
1 x user manual
1 x carrying case
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Measuring principle
The LEEB method of measurement was first used in 1978. It is defined as the quotient of the
rebound velocity of an impact body over its impact velocity, multiplied by 1000. The harder a
material surface, the higher the rebound velocity will be. The Leeb hardness value represents the
direct relation of a group of materials (e. g. steel, aluminium) to its hardness properties.
For the most common metals, conversion charts are available. These enable the user to convert
HL hardness values into other standard hardness units (HB, HV, HRC, etc.).
An impact body with a spherical measuring tip made of tungsten carbide is accelerated towards
the test surface and then rebounds. The impact and rebound velocities are measured at a
distance of 1 mm from the test surface, using the following method: a permanent magnet in the
impact body induces an electrical current into the coil when passing through the coil in the coil
holder. This electrical current is proportional to the velocities of the magnet. Leeb hardness values
can be calculated by using the following formula:
HL = 1000 x (VB / VA)
HL : Hardness according to Leeb
VB : Rebound velocity
VA : Impact velocity
