Self-powered ammeter
US4422039A · kind A · utility
20Cited by
1References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R1/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A self-powered ammeter is disclosed. A metering circuit receives an a-c current to be tested and then generates a d-c voltage whose magnitude is proportional thereto. A display circuit receives the d-c metered voltage and provides a visual indication of the magnitude of the measured current. The current to be measured also drives a current transformer which, in turn, has an output burden circuit which produces a regulated power supply for the metering and display circuit components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.