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| TDC: time to digital converter | fast secondary emission multiplier (SEM) where first converter plate (dynode) is flat . The electrical signal from the detector is recorded by means of a time to digital converter (TDC) or a fast analog-to-digital converter (ADC). TDC is mostly used in combination with orthogonal-acceleration (oa)TOF instruments. Time-to-digital converters register the arrival of a single io |