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The Perkin-Elmer/Excelitas/EG&G TM-Series of Trigger Modules are line voltage operated, compact instruments which contain the necessary circuitry required for initiating fast triggering. The TM-27 is designed to drive the grid of thyratrons up to 3 inches in diameter. It features an internal pulse rate of 1-2000 pps and a typical output risetime of 150 ns.