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It uses [[TD253|TD253B]] [[tunnel diodes]] for triggering. | It uses [[TD253|TD253B]] [[tunnel diodes]] for triggering. | ||
The 5T3 can be triggered from any of four different sources: | |||
# Internal trigger from the sampling plug-in, interconnect J9. | |||
# Internal trigger from the calibrator module in the 661 mainframe. | |||
# External trigger to the high-impedance BNC trigger input. This input is buffered by an [[8056]] [[nuvistor|Nuvistor]] cathode follower. | |||
# External trigger to the 50 Ω [[GR-874]] trigger input. This input has two different modes: | |||
## a conventional Schmitt trigger with 500 MHz bandwidth that skips the high-impedance Nuvistor input buffer but is still buffered by Q64 and Q124 (1 GHz NPN transistors, part number 151-0138-00, 2N2857) before the tunnel diode trigger event recognizer circuit. | |||
## a passive low-impedance path, capacitively coupled to a tunnel diode for "UHF SYNC" mode, which works up to 5 GHz. | |||
The 5T3 can also be set to free-run mode. | |||
{{MissingSpecs}} | {{MissingSpecs}} | ||