Electrical line interruption detection and alarm circuit

Details Electrical line interruption detection and alarm circuit Electrical line interruption detection and alarm circuit

1983-12-02

1986-07-01

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

128696, 128731, 128902, 128908, G08B 2100

Patent

active

045982813

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.

REFERENCES:
patent: 3495584 (1970-02-01), Schwalm
patent: 3559193 (1971-01-01), Savaglio et al.
patent: 3580243 (1971-05-01), Johnson
patent: 3602215 (1971-08-01), Parnell
patent: 3732859 (1973-05-01), Tateno
patent: 3905364 (1975-09-01), Cudahy et al.
patent: 4092981 (1978-06-01), Ertl
patent: 4141351 (1979-02-01), James et al.
patent: 4191195 (1980-03-01), Miller
patent: 4321932 (1982-03-01), Francis
patent: 4488110 (1984-12-01), Shirey et al.

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