Digital voltmeter with variable color background

Details Digital voltmeter with variable color background Digital voltmeter with variable color background

1986-12-10

1989-05-16

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324120, G01R 1508, G01R 1926

Patent

active

048313262

ABSTRACT:
A digital voltmeter includes a display device surrounded by a variable color background area for indicating measured voltage in a digital format. The color of the background area is controlled in accordance with the significance of measured voltage.

REFERENCES:
patent: 2643344 (1953-06-01), McLaren et al.
patent: 2648015 (1953-08-01), Greenfield et al.
patent: 2682000 (1954-06-01), Clayton et al.
patent: 4438498 (1984-03-01), Sekel et al.

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