The invention relates to the control of the test equipment and can be used to measure the hardness of materials. Ultrasonic Hardness rod comprises an acoustic resonator with the indenter at one end, a spring load being fixed to a resonator piezo transducers. There is also an electronic processing unit and register. To determine the hardness of the samples measured resonant frequency of the indenter by scanning the frequency band ranging signal of the electronic circuit and finding the resonance frequency of the maximum response on the probe signal. This allows you to more accurately determine the resonant frequency of the indenter that is embedded in the material to be tested. 1 yl.
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