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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.   
{{Instrument Sidebar
|manufacturer=Tektronix
|model=111
|class=Pulse generator
|series=
|summary=Pretrigger Pulse Generator
|image=Tek 111 front.jpeg
|caption=Front View
|introduced=1960
|discontinued=(?)
|designers=
|manuals=
* [[Media:070-252.pdf|Tektronix 111 Manual]]
* [https://w140.com/tek_fcp/tek_type_111_factory_cal_proc.pdf Tektronix 111 Factory Calibration Procedure]
}}
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 main output pulse of the Type 111 is produced by an avalanche transistor.  The risetime is specified as "0.3 nanosecond" in the Auxiliary Equipment
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.
section at the end of the Type [[N]] manual, and "equal to or less than 500 picoseconds" in the Characteristics section of the 111 manual.


For a stable display, it is essential for the delay between pretrigger and main pulse to be stable, free of jitter. The pretrigger-to-main pulse jitter of the Type 111 is specified as 100ps.  The repetition rate is 10/sec to 100,000/sec.  The main output pulse amplitude is specified to be at least 10 volts into 50 ohms.
{{BeginSpecs}}
{{Spec | Pulse repetition rate | 10 Hz to 100 kHz, or by external trigger }}
{{Spec | Rise time | <500 ps }}
{{Spec | Pre-trigger | 30−250 ns variable with additional calibrated "+1 ns" switch, jitter ≤100 ps }}
{{Spec | Output amplitude | ≥10 V (selectable polarity) into 50 Ω }}
{{EndSpecs}}
The Auxiliary Equipment section in the [[N|Type N]] manual says the rise time is 300 ps.  The 111 front panel and manual specify <500 ps.


* [http://bama.edebris.com/download/tek/111/Tek%20111.pdf Tektronix 111 Manual (PDF)]
==Links==
* [http://w140.com/tek_fcp/tek_type_111_factory_cal_proc.pdf Tektronix 111 Factory Calibration Procedure (PDF)]
* [https://www.analog.com/en/resources/technical-articles/diode-turn-on-time-induced-failures-in-switching-regulators.html Linear Technology Application Note 122, ''Diode Turn-On Time Induced Failures in Switching Regulators'']. [[Jim Williams]], 2009
{{Documents|Link=111}}


==Internals==
The main output pulse of the Type 111 is produced by an avalanche transistor. 
==Pictures==
<gallery>
<gallery>
File:Tek 111 front.jpg
Tek 111 front.jpg|Front View
Image:Tek 111 schem.gif
Tek_111-Front.jpg | Front
Tek_111_left.jpg|Left Internal View
Tek 111 left internal.jpg|Left Internal View
Tek 111 right.jpg|Right Internal View
Tek 111 right internal.jpg|Right Internal View
Tek_111_rear.jpg|Early serial number rear view
Tek_111-Rear.jpg | Rear
Tek 111 rear2.jpg|Late serial number rear view
Tek 111 schem.gif|Schematic
Tek 110 or 111 and type n diode measure.jpg
Tek type 111 two triggers per pulse 1.jpeg|111 with two triggers per pulse switch
Tek type 111 two triggers per pulse 2.jpeg|111 with two triggers per pulse switch
Tek type 111 two triggers per pulse 3.jpeg|111 with two triggers per pulse switch
</gallery>
</gallery>
==Components==
{{Parts|111}}
[[Category:Pulse generators]]

Latest revision as of 22:52, 1 July 2024

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

  • Front View

    Front View

  • Front

    Front

  • Left Internal View

    Left Internal View

  • Left Internal View

    Left Internal View

  • Right Internal View

    Right Internal View

  • Right Internal View

    Right Internal View

  • Early serial number rear view

    Early serial number rear view

  • Rear

    Rear

  • Late serial number rear view

    Late serial number rear view

  • Schematic

    Schematic

  • 111 with two triggers per pulse switch

    111 with two triggers per pulse switch

  • 111 with two triggers per pulse switch

    111 with two triggers per pulse switch

  • 111 with two triggers per pulse switch

    111 with two triggers per pulse switch

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
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