Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-08-19
1995-01-17
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
280735, 340438, G01K 2702, B60R 2132, B60Q 100
Patent
active
053829123
ABSTRACT:
An aircraft fire extinguisher system includes a fire extinguisher bottle and an attached explosive squib which has one side connected to ground and its other side connected alternately to two constant current sources in opposite senses. A differential amplifier subtracts the voltages in two sample-and-hold circuits caused by the opposite currents to eliminate the effect of the voltage at the point where the squib is grounded. A utilization circuit, coupled to the output of the differential amplifier, is used to indicate the presence of a fault in the squib or in associated circuitry.
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Regan Maura K.
Smiths Industries Public Limited Company
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