Measuring and testing – Vibration – Hardness or compliance
Patent
1990-12-11
1992-08-25
Williams, Hezron E.
Measuring and testing
Vibration
Hardness or compliance
73664, 73 7, G01N 1900
Patent
active
051408570
ABSTRACT:
The invention provides a friability testing apparatus which has an electrically excitable vibrator (10, 12) for vibrating a capsule (14) containing material to be tested. The apparatus includes a microprocssor (20) which proivdes an output waveform with a frequency which is determined by an oscillator (22). The output of the microprocssor drives a power amplifier (18) which controls the vibrator. An accelerometer (16) supplies signal to the microprocessor, so that the operation of the vibrator is maintained within predetermined limits.
REFERENCES:
patent: 2844777 (1958-07-01), Ross
patent: 3141325 (1964-07-01), Hajian
patent: 3636772 (1972-01-01), Bennett
patent: 4297888 (1981-11-01), Hirai et al.
patent: 4733151 (1988-03-01), Butts
Finley Rose M.
Williams Hezron E.
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