Designing and testing a field programmable gate array based trigger system

This paper addresses the problem of recording those fast voltage variations with features that do not meet the conditions required by conventional trigger systems. It is about transients, with amplitudes below the minimum trigger level that is usually set higher than the maximum amplitude of the rated voltage. For this purpose, it is used a Butterworth numeric type filter, implemented on an field programmable gate array (FPGA) processor in order to obtain a trigger command at a slope variation of the traced signal.