Beckman Instruments, Inc.

Hoke R Chism, Jr

George I Reeves

Carl N Cederstrand

A gas analyzer is disclosed which provides a dual channel capability for the simultaneous determination of the presence and concentration of two gases in a stream of sample gas and which has a single infrared source, a single sample cell, two infrared bandpass filters, and two infrared detectors. A separator between the filters and detectors prevents interchange of radiation between the filters. The separator is positioned by fitting it in a slot.

Split detector

Method and apparatus for generating a sweep signal for the oscilloscope of an engine ignition analyzer, employing a lock loop with phase detector, integrator and voltage controlled oscillator. The oscillator provides a ramp voltage for use as a sweep signal. A feedback circuit provides a feedback signal to the input of the phase detector when the ramp voltage reaches a predetermined value for phase comparison with a reference signal related in time to an engine ignition event. The intetrator output controls the slope of the ramp voltage. When the two input signals to the phase detector are out of phase, the slope of the ramp voltage is changed via the integrator to reduce the phase difference. The ramp voltage provides a sweep signal of substantially constant length while the engine speed varies over the range of idling to full speed.

Sweep generator for engine analyzers

An automotive ignition analyzer is disclosed with cylinder of interest of display capabilities which allows one or more cylinders to be individually selected and displayed in a stacked mode while the remaining unselected cylinders are simultaneously displayed on the same oscilloscope in a parade mode. The cylinder select mechanism may also be used for power balance purposes to prevent the ignition of the cylinder selected.

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Anaheim, CA, United States of America

Hoke R Chism, Jr