Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates
Patent
1982-06-18
1985-05-28
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural ranges, scales or registration rates
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.
Emile, Jr. Philip
Kelly Austin T.
Stolpen Alan H.
Baker S.
Levy Stewart J.
Sycon Corporation
LandOfFree
Autofunction voltmeter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Autofunction voltmeter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Autofunction voltmeter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-870885