111

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Tektronix 111
Pretrigger Pulse Generator
Front View

Produced from 1960 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type 111 Pretrigger Pulse Generator produces two pulse signals, one to trigger an oscilloscope sweep and a main output pulse to stimulate the device under test.

The trigger pulse comes between 30 and 250 nanoseconds before the output pulse; this is controlled by a knob on the 111. This gives adequate time for the oscilloscope to start sweeping so that the leading edge of the input or output signals of the device under test can be viewed. The alternative is to have a delay line in the signal path, after the trigger pickoff, but delay lines degrade transient performance. Using a pretrigger eliminates the need for a delay line in the vertical signal path and therefore enables accurate high-speed measurements. For a stable display, low jitter of the delay between pretrigger and main pulse is essential.

Key Specifications

Pulse repetition rate 10 Hz to 100 kHz, or by external trigger
Rise time <500 ps
Pre-trigger 30−250 ns variable with additional calibrated "+1 ns" switch, jitter ≤100 ps
Output amplitude ≥10 V (selectable polarity) into 50 Ω

The Auxiliary Equipment section in the Type N manual says the rise time is 300 ps. The 111 front panel and manual specify <500 ps.

Links

Documents Referencing 111

(no results)

Internals

The main output pulse of the Type 111 is produced by an avalanche transistor.

Pictures

Components

Some Parts Used in the 111

Part Part Number(s) Class Description Used in
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 111 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4