Voltage comparator and indicating circuit
US4005365A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1975 |
| Grant date | Jan 25, 1977 |
| Priority date | — |
| Expiry date | Mar 26, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device including a voltage indicator circuit has the capability of indicating positive, neutral and negative voltages with respect to a reference voltage. Three indicator circuits are mounted on a single substrate. Each indicator circuit energizes a respective light emitting diode to indicate whether a voltage applied to a probe is positive, neutral or negative with respect to a reference voltage. The reference voltage is applied to a ground or reference terminal on the circuit. An alternating voltage is indicated by rendering effective all three light-emitting diodes. An open circuit can be ascertained by the absence of a positive signal from all the diodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.