Decompression and air consumption computer

Details Decompression and air consumption computer Decompression and air consumption computer

1987-06-09

1989-01-03

Noland, Tom

Measuring and testing

Human stress limit

738662, 73714, 73301, 330 69, 374103, 374171, 374173, G01F 2318, G01D 2102, G01D 704, H03F 700

Patent

active

047948035

ABSTRACT:
An improved SCUBA diving gauge. A pictograph display is provided which has a shape which conveys the type of information being displayed. The pictograph has the shape of a SCUBA tank for a tank pressure display and the shape of a person for a display of nitrogen absorbed. Pressure transducers coupled to the SCUBA tank and the external water provided the pressure readings required to produce the respective displays. The differential signal from the transducer is supplied to a processor through an auto-zeroing circuit. The auto-zeroing circuit uses a capacitor initially coupled to an amplifier reference input and single ended output to store an offset voltage. During a measurement, the capacitor is disconnected from the amplifier output and has its other lead coupled to a full scale value of the differential input to produce an output signal which is a ratio.

REFERENCES:
patent: 3390347 (1968-06-01), Jones et al.
patent: 3747007 (1973-07-01), Geitner
patent: 3992948 (1976-11-01), D'Antonio et al.
patent: 4005282 (1977-01-01), Jennings
patent: 4192001 (1980-03-01), Villa
patent: 4307449 (1981-12-01), Strubin

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