Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates
Patent
1975-09-08
1978-09-12
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural ranges, scales or registration rates
324 99D, G01R 1508, G01R 1706
Patent
active
041140940
ABSTRACT:
A digital voltmeter for measuring an input voltage which can lie in any one of M successive ranges comprises an input scaling device which scales the input voltage to produce a voltage lying in a single predetermined range, and which also produces a range signal indicative of the range in which the input voltage lies. An analogue-to-digital conversion circuit then converts the scaled voltage to a corresponding digital signal which has up to N significant decade figures of resolution, where N<M. The voltmeter has a display unit with M decades, each of which represents a fixed order of magnitude of the input voltage, and control means responsive to the range signal to direct the digital signal to the group of N adjacent decades of the display means appropriate to the magnitude of the input voltage.
REFERENCES:
patent: 2889518 (1959-06-01), Hudson et al.
patent: 2993157 (1961-07-01), Bradley, Jr.
patent: 3237102 (1966-02-01), Newell
patent: 3974444 (1976-08-01), Whitaker
Whitaker, R. O., "Is the Arabic-Decimal. . . ;" EDN; Feb. 5, 1974, pp. 86-92.
Cook John Gerald
Shaw Julian David
Karlsen Ernest F.
Manzo Edward
McMahon Kevin
Rolinec Rudolph V.
Sherman William R.
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