Autofunction voltmeter

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates

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G01R 1508, G01R 1702

Patent

active

045203105

ABSTRACT:
Circuitry for use in a voltage measurement and display device provides automatic function change for measurement of AC or DC voltages. Voltage measurement in a predetermined mode (DC, for example), is assumed. Upon detection of an input voltage component exceeding a predetermined threshold of the other mode, (AC, for example), the measurement function is changed to that other mode. Upon detection of a component in the other mode, in a range between the predetermined threshold and a second (preferably lower) threshold, an annunciator is activated to alert the user to the presence of the other mode (AC) voltage, for manual activation of a function-selecting switch if desired. Thus, in a specific embodiment, automatic function changeover is provided upon detection of AC components exceeding a predetermined threshold, along with activation of an AC annunciator. Alternatively, in the presence of low magnitude AC ripple voltage components on a DC voltage being measured, the annunciator is activated to attract the operator's attention, with measurement continuing in the DC function.

REFERENCES:
patent: 3237102 (1966-02-01), Newell
patent: 3345562 (1967-10-01), Rockwell
patent: 3536998 (1970-10-01), Nordholm
patent: 3614610 (1971-10-01), Legatti
patent: 3629704 (1971-12-01), Stevens
patent: 4092591 (1978-05-01), Lozowski
patent: 4156845 (1979-05-01), Muellner et al.
"New Concept Digital Multimeters", Hioki Digital Hi Tester, Cat. No. 3207E, Nagano, Japan, Jan. 1980.

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