Digital multimeter with more closely spaced ranges

Details Digital multimeter with more closely spaced ranges Digital multimeter with more closely spaced ranges

1978-09-21

1981-02-10

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

G01R 1508

Patent

active

042504473

ABSTRACT:
The subject invention relates to digital multimeter instruments for the measurement of physical quantities and, more particularly, to increasing the effective measurement resolution and accuracy thereof. In one form, a multirange digital voltmeter is provided with scales and ranges in a 1-2-5-10 relationship. The voltmeter includes an analog-to-digital converter which is connected through a digital multiplier to a digital display. The multiplier provides multiplication ratios of 1, 2 or 5, depending on the selected scale. The displayed value will change in increments of 1, 2 or 5 units of the least significant displayed digit for a change of one unit of the analog-to-digital converter output, depending on the selected scale and corresponding multiplier setting. This allows the various scales to have at least approximately the same number of digital steps over their full ranges.

REFERENCES:
patent: 2509415 (1950-05-01), Bernreuter

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