Operation Manual
Hardness Tester NOVOTEST T-UD3
Page. 4
Caution!
Please read this manual carefully before using the NOVOTEST T-UD3 hardness tester.
This operating manual (hereinafter O.M.) includes general information in order to give the
operating personnel understanding of functioning and operating rules of the NOVOTEST T-UD3
hardness tester (hereinafter referred to as the device or hardness tester). The document contains
technical characteristics, description of the design and principle of operation, as well as information
necessary for the correct use of the device. Before starting work, it is necessary to read this manual, as
the device operation must be carried out by persons who are familiar with the operation principle and
the device design.
Correct and effective use of the hardness tester requires obligatory availability:
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Testing methods;
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Conditions for testing, according to testing methods;
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Trained, and familiar with this O.M. user.
The enterprise-manufacturer reserves the right to make non-critical changes, without making
worse technical characteristics of the device. These changes may not be mentioned in the text of
current document.
The standard delivery kit of the device includes the operational documentation as a part of this
O.M. and the SERVICE AND MAINTENANCE RECORDS.
The present O.M. applies to all modifications of the device: T-UD3, T-U3, T-D3.
Terms used in this manual:
Hardness testers for metals
– are used for material hardness testing, without destroying its
structure.
Hardness
– property of a material to resist the elastic and plastic deformation, or destruction when
another material that is more solid is incorporated into the surface layer and takes no deformation of its
body - an indenter.
Indenter
– an element of the device pressed into the testing material for measuring its hardness.
Diamonds, hard alloys, hardened steel are used for manufacturing indenters.
Young's modulus
(modulus of longitudinal elasticity) – physical value characterizes the
properties of the material to resist tension, compression under elastic deformation.
Leeb method
– to measure the hardness of the material, the rebound method is used (the ratio of
the speed of the impact body before and after the impact).
Ultrasonic Contact Impedance (UCI)
– measuring the degree of change (damping) of the
vibration frequency of the rod with the indenter at the end when penetrating into the surface of the
testing sample. The softer is metal the dipper indenter penetrates into it, and the bigger is square of the
contact and higher degree of damping of the vibration frequency (in the ultrasonic range).
Kalman filter
– an effective recursive filter that estimates the vector of a dynamic system state
using a series of incomplete and noisy measurements.
Median filter
– one of the digital filter types, widely used in digital signal processing to reduce
noise. The median filter is non-linear FIR filter. Median filtering is an efficient procedure for
processing signals influenced by impulse noise.