Automatic ranging circuit for a digital panel meter

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

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Details

324 99D, G01R 1508, G01R 1706

Patent

active

039581780

ABSTRACT:
This invention relates to a range changing circuit that operates in conjunction with a digital panel meter of fixed sensitivity. The circuit decodes the output of the panel meter and uses that information to change the gain of an input amplifier to the panel meter in order to insure that the maximum number of significant figures is always displayed in the meter. The circuit monitors five conditions in the meter and responds to any of four combinations of these conditions by means of logic elements to carry out the function of the circuit.

REFERENCES:
patent: 3187323 (1965-06-01), Flood et al.
patent: 3790886 (1974-02-01), Kurtin et al.

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