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materials with properties other than carbon structural steels.
The hardness tester is designed for use in laboratory, workshop and field conditions.
1.2 The principle of operation of the hardness tester
The hardness tester consists of a probe and an electronic unit for converting signals
from the probe and processing the measurement results.
The electronic unit receives a frequency signal from the probe of the device, converts
it into units of hardness, and displays the measurement results on the display, statistical
processing, and other functions.
The principle of operation of the hardness tester is based on two methods of measuring
hardness - dynamic and ultrasonic.
Dynamic method
The technique is to determine the rebound rate of the carbide indenter from the surface
of the controlled product.
The components of the hardness tester are a probe and an electronic unit for converting
signals from the probe and processing the measurement results.
The main parts of the probe are the indenter and the electromagnetic coil. When the
rebound of the indenter from the test product in the coil is the EMF, which is proportional to
the rate of rebound of the surface of the product. The rebound speed is determined by the
hardness of the productу.
Since the bounce rate of the indenter is an indicator of hardness, there is a relationship
between the bounce rate V and the hardness of the material H:
Н = f(V)
The electronic unit of the hardness tester receives a signal from the probe of the device,
its conversion into units of hardness, the output of results of measurements on the display,
statistical processing, and other functions of this hardness tester.
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