Automatic intensity control circuit for an oscilloscope

Details Automatic intensity control circuit for an oscilloscope Automatic intensity control circuit for an oscilloscope

1978-10-23

1980-07-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358168, H01J 2952

Patent

active

042152941

ABSTRACT:
An automatic intensity control circuit is provided for maintaining a constant perceived display brightness in an oscilloscope under varied operating conditions. The circuit includes an averaging circuit, a translation circuit, and a multiplier circuit to develop a cathode-ray tube grid bias control voltage which is inversely proportional to the duty cycle of the time-base sweep gate signal. Two or more such automatic intensity control circuits may be multiplexed for multi-trace oscilloscopes to maintain a constant perceived brightness when alternating between two or more traces.

REFERENCES:
patent: 3757156 (1973-09-01), Mueller et al.
patent: 3775637 (1973-11-01), Brady
patent: 3848945 (1974-11-01), Holzrichter

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