Electrical line interruption detection and alarm circuit
US4598281A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1983 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Dec 2, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/908
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit for detecting and indicating an interruption in the electrical connection between a signal device and a signal processing device, which has been provided with an amplifier at its input. The signal device has a relatively low impedance and the signal processing device has a relatively high impedance. The circuit includes an alarm device which generates an alarm when the predetermined upper limit of the amplifier input voltage has been exceeded. Also included are a supply circuit to feed an auxiliary dc current into the connection between the signal device and the signal processing device. The supplied auxiliary current is controlled by the amplifier input voltage to rise during an increased amplifier input voltage. As a result, a lower current supply can be provided under normal circumstances, which reduces misinterpretations. Preferably, the circuit is used in connection with ECG measuring devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.