Visual monitor for electrical signals
US4628303A · kind A · utility
9Cited by
8References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Jun 5, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/1659
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit for monitoring the status of electrical signals, such as those present on the control and data lines of an RS-232 interface, includes a single operational amplifier and a dual-color LED indicator. The electrical characteristics of the LED's form a significant part of the circuit parameters. The monitor design provides a predetermined circuit input impedance and positive/negative switching thresholds to effect the selective illumination of the LED's.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.