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5T3: Difference between revisions
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The 5T3 can be triggered from any of four different sources: | The 5T3 can be triggered from any of four different sources: | ||
# Internal trigger from the sampling plug-in, via interconnect J9. | # Internal trigger from the sampling plug-in, via interconnect J9. | ||
# Internal trigger from the calibrator module in the 661 mainframe. | # Internal trigger from the calibrator module in the 661 mainframe. This works up to 1 GHz. | ||
# External trigger to the high-impedance BNC trigger input. This input is buffered by an [[8056]] [[nuvistor|Nuvistor]] cathode follower. | # External trigger to the high-impedance BNC trigger input. This input is buffered by an [[8056]] [[nuvistor|Nuvistor]] cathode follower. This can be used for triggering on signals up to 20 MHz. | ||
# External trigger to the 50 Ω [[GR-874]] trigger input. This input can drive either of two selectable signal paths: | # External trigger to the 50 Ω [[GR-874]] trigger input. This input can drive either of two selectable signal paths: | ||
#* A path where the trigger signal skips the high-impedance Nuvistor input buffer but is still buffered by Q64 and Q124 (1 GHz NPN transistors, part number [[151-0138-00]]) before the tunnel diode trigger event recognizer circuit. This path provides triggering up to 500 MHz. | #* A path where the trigger signal skips the high-impedance Nuvistor input buffer but is still buffered by Q64 and Q124 (1 GHz NPN transistors, part number [[151-0138-00]]) before the tunnel diode trigger event recognizer circuit. This path provides triggering up to 500 MHz. | ||