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A Digital Recorder for Mass Spectra

Volume 12, Number 2 (May 1958) Page 40-46

Caldecourt, V.J.

As a mass spectrum is scanned, the maximum value of each peak is stored in a capacitor. Then the difference between the stored voltage and the lesser voltage seen after the scan has proceeded down the side of the peak operates a peak detector, which in turn initiates measurement of the stored peak height by a digital voltmeter. At the same time the mass is determined by measuring the ion accelerating voltage with a modified self balancing potentiometer equipped with a shaft position digitizer.