Automatic intensity control circuit for an oscilloscope
US4215294A · kind A · utility
3Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1978 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | Oct 23, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.