Autoranging digital luxmeter

Details Autoranging digital luxmeter Autoranging digital luxmeter

1975-06-17

1976-08-03

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

250214P, 354 23D, G01J 144

Patent

active

039726266

ABSTRACT:
An autoranging digital luxmeter is disclosed in which the current from a photocell is converted into a voltage by cascaded, variable gain amplifiers. The output of the amplifiers is coupled by a sample-and-hold circuit to an analogue-to-digital converter, the output of which is a digital representation of lux. The output of the amplifiers is also connected to limit comparison circuitry which, by way of an up-down counter, varies the gain of one or both of the amplifiers.

REFERENCES:
patent: 3790288 (1974-02-01), Hostetter
patent: 3843265 (1974-10-01), Egli et al.

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