OPERATIONAL PROCEDURES FOR THE EDDY CURRENT METAL INTEGRITY CARTRIDGE MlEASUREMENT AND EJECT SYSTEMS
1985
Abstract
its circumference at four different locations on the case. Also described are some rather unique features of the electronic instrument. These include an oblong search coil which is contoured to cartridge case motion, a temperature stabilization method based on constant current excitation of send-receive coils, and a rapid automatic nulling technique employing digital methods. Additionally, a method for using a Q-multiplier as either an oscillator or a bandpass filter is described. The method facilitates the use of a bandpass filter that is precisely matched to the eddy current signal generator so that no output phase error occurs during minute drifts in test frequency.
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