Penetration hardness tester with digital readout

Details Penetration hardness tester with digital readout Penetration hardness tester with digital readout

G - Physics

01

N

73/87

G01N 3/40 (2006.01) G01N 3/44 (2006.01)

Patent

CA 1088774

PENETRATION HARDNESS TESTER WITH DIGITAL READOUT Abstract of the Disclosure A semi-automatic penetration hardness tester for measuring hardness of a test specimen in a selected one of a number of hardness number scales. A digital display in- dicates penetrator displacement during application of a minor load in a first mode of operation and may be monitored by an operator to achieve a penetrator displacement within a pre- selected range corresponding to application of a minor load of desired magnitude. A control circuit senses manual ini- tiation of a major load application and automatically scales the minor load penetrator reference position to a reference hardness number corresponding to and correlated with the selected hardness number scale. The control circuit also senses an operator error during the test procedure and automatically aborts the test.

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