Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1979-05-04
1981-04-28
Ruehl, Charles A.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73 1J, G01C 2500
Patent
active
042638038
ABSTRACT:
A calibration system for automatically and sequentially calibrating a plurality of electrical measuring systems of a gauging machine is provided. Each measuring system is of the type having a gain circuit, a zero circuit and a combination circuit connected to the preamplifier of a transducer and the zero circuit for combining the output signals of the preamplifier and zero circuits to obtain unamplified compensated electrical input signals which are amplified by the gain circuits and indicated on an indicator. Each of the measuring systems produces an electrical measurement in a predetermined range defined by upper and lower bounds equal in magnitude but opposite in polarity. The calibration system includes a plurality of negative voltage references and a plurality of positive voltage references corresponding to the lower and upper bounds, respectively. The transducers are first moved to the negative voltage references by a servo system to obtain a plurality of first input signals which are sequentially compared under control of a sequence controller and a multiplexer to a fixed reference signal corresponding to the lower bound by a window comparator. The transducers are then moved to the positive voltage references to obtain a plurality of second input signals. The second input signals are processed, the processed signals being sequentially compared to a fixed reference signal corresponding to the upper bound.
REFERENCES:
patent: 3416658 (1968-12-01), Goller et al.
patent: 3454880 (1969-07-01), Ries et al.
patent: 3795054 (1974-03-01), Kinney
Ex-Cell-O Corporation
Ruehl Charles A.
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