5T3

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The Tektronix Type 5T3 is a timing plug-in for the Type 661 sampling oscilloscope. It uses TD253B tunnel diodes for triggering.

The 5T3 can be triggered from any of four different sources:

1. Internal trigger from the sampling plug-in, via interconnect J9.
2. Internal trigger from the calibrator module in the 661 mainframe.
3. External trigger to the high-impedance BNC trigger input. This input is buffered by an 8056 Nuvistor cathode follower.
4. 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 passive low-impedance path, capacitively coupled to a tunnel diode for "UHF SYNC" mode. This works up to 5 GHz.

The 5T3 can also be set to free-run mode.

Key Specifications

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