Automatic function selecting multimeter

Details Automatic function selecting multimeter Automatic function selecting multimeter

1989-11-28

1992-06-02

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

364483, G01R 1508

Patent

active

051190192

ABSTRACT:
Disclosed is a digital multimeter having an automatic function selection capability. The device includes a sensing circuit connected to its input to respond to the type of analog signal which is sensed and to provide logic signals which are characteristic thereof. These logic signals may be utilized to cause generation of encoding signals to encode and dispose the converter circuit to perform the desired conversion function and provide the desired display as a function of the analog input. The device may include an internal reference signal source such as a DC reference potential and the sensing circuit may sense a differential between such reference source and the external analog signal to make a determination to utilize or disconnect the reference signal source in performing the function dictated by the nature of the analog signal.

REFERENCES:
patent: 2870408 (1959-01-01), Draganjac
patent: 3790886 (1974-02-01), Kurtin et al.
patent: 4001683 (1977-01-01), McNeilly
patent: 4105967 (1978-08-01), Macemon
patent: 4329641 (1982-05-01), Ikeda et al.
patent: 4540974 (1985-09-01), Schanne et al.
patent: 4825150 (1989-04-01), Sirasud

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