Boots – shoes – and leggings
Patent
1988-04-08
1990-05-15
Lall, Parshotam S.
Boots, shoes, and leggings
341120, 324 99D, 364550, 36457105, G01G 2500, G01R 1706
Patent
active
049263609
ABSTRACT:
The invention provides an electronic gage amplifier which converts sinusoidal signals representing measurement data from a gage head into a visual display of measurement data. The measurement signals are received by the amplifier at the input of a mixer where they are combined with a coarse adjustment signal. The coarse adjustment signal, which is provided by a multiplying digital-to-analog converter (MDAC) which is controlled by a microcomputer, yields a fine adjustment signal when mixed with the measurement signal. The resulting fine adjustment signal is amplified by a preamplifier, translated into a steady-state voltage by a programmable-gain demodulate-and-hold circuit (D/H) and converted to a digital word by an analog-to-digital converter (ADC). The microcomputer further causes a known reference signal to be processed through the MDAC, mixer, preamplifier, D/H, and ADC. The microcomputer compares the resulting digital word to a known reference value and determines any errors introduced by the aforementioned circuitry. The microcomputer then combines the digital word obtained in response to the fine adjustment signal with a digital word representative of the coarse adjustment signal and a digital word representative of the calculated error introduced by the circuitry in such a manner so as to obtain a correct measurement value which is then displayed.
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Brown & Sharpe Manufacturing Co.
Lall Parshotam S.
Teska Kevin J.
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