To measure sample hardness on a real time basis without using a conversion table by correcting sample hardness calculated on the basis of a signal from a speed sensor, using inclination information detected with an inclination sensor on a body.
An inclination sensor 10 attached to a body 1 for electrically measuring the inclination of a hardness tester is formed so that a weight 13 is mounted on the rotary piece 15 of a rotary variable resistor 14. In this case, when the echo tip type hardness tester so made is tilted by an angle θ for a horizontal plane 01, the rotary piece 15 turns from a vertical state by the same angle as the inclination angle θ. Thus, a resistance value (electrical resistance) corresponding to the inclination angle θ is obtained across the terminals (a) and (b) of the inclination sensor 10, and inputted to CPU 7 as inclination angle information during the measurement of hardness. Also, the CPU 7 calculates a numerical value (hardness) on the basis of speed signals available immediately before and after the collision of an indentation hammer 3 via a coil 4 and a voltage converter 5, and corrects the numerical value by use of the inclination angle information. A display part 8 digitally shows the result of the corrected value on a real time basis.
NAGAZONO HIDEMI
YAMADA TAKAYUKI
