284: Difference between revisions

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|introduced=1967
|introduced=1967
|discontinued=(?)
|discontinued=(?)
|designers=
|designers=Fred Kawabata
|manuals=
|manuals=
* [[Media:070-0754-00.pdf|Tektronix 284 Manual 070-0754-00]]
* [[Media:070-0754-00.pdf|Tektronix 284 Manual 070-0754-00]]
* [[Media:070-0754-00 late.pdf|Tektronix 284 Manual 070-0754-00]] (later version)
* [[Media:070-0754-01.pdf|Tektronix 284 Manual 070-0754-01]] (no schematics)
* [[Media:070-0754-01.pdf|Tektronix 284 Manual 070-0754-01]] (no schematics)
* [[Media:Tek 284 fcp oct 1967.pdf|Tektronix 284 Factory Calibration Procedure, October 1967]]
* [[Media:Tek 284 fcp oct 1967.pdf|Tektronix 284 Factory Calibration Procedure, October 1967]]
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}}
}}
The '''Tektronix 284''' is a pulse generator [[introduced in 1967|introduced in July 1967]].
The '''Tektronix 284''' is a pulse generator [[introduced in 1967|introduced in July 1967]].
It was designed by [[Fred Kawabata]].
Its output modes include:
Its output modes include:
* 70 ps risetime pulse, 200 mV, 50 kHz repetition rate, 1 μs pulse duration (5% duty cycle)
* 70 ps risetime pulse, 200 mV, 50 kHz repetition rate, 1 μs pulse duration (5% duty cycle)
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Only one mode can be used at a time.  The pulse comes out one output connector.  The sine wave and square wave come out another output connector. Both outputs are 50 Ω [[GR-874]].
Only one mode can be used at a time.  The pulse comes out one output connector.  The sine wave and square wave come out another output connector. Both outputs are 50 Ω [[GR-874]].


==Links==
* [[284-based PPPG]]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/284.html Tek 284 page at amplifier.cd] with detailed internals and repair/cal report
* [https://shaunmerrigan.info/electronics/tektronix-284-pulse-generator-repair/ Tek 284 Repair at shaunmerrigan.info] Photos of TD and output waveforms
* [https://www.youtube.com/watch?v=8kweJOFoi1g 284 rebuild including Airline and D-180] / [https://www.youtube.com/watch?v=xvBzUflcYmE Testing on Tek 577] by Zenwizard Studios @ YouTube
{{Documents|Link=284}}
{{PatentLinks|284}}
==Internals==
The 284 generates a 1 GHz sinewave using a [[2N3478]] RF NPN transistor-based oscillator.
The 284 generates a 1 GHz sinewave using a [[2N3478]] RF NPN transistor-based oscillator.


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Modification kit [[040-0487-00]] changes the times selectable with the lead time switch.
Modification kit [[040-0487-00]] changes the times selectable with the lead time switch.
==Links==
* [https://www.youtube.com/watch?v=8kweJOFoi1g Zenwizard Studios - Unit I rebuild including Airline and D-180]
* [https://www.youtube.com/watch?v=xvBzUflcYmE Zenwizard Studios - Unit I rebuild including Airline and D-180 testing on Tek 577]
{{Documents|Link=284}}
==See Also==
* [[284-based PPPG]]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/284.html Tek 284 page at amplifier.cd] with detailed internals and repair/cal report


==Pictures==
==Pictures==
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Tek 284 clean rear.jpg
Tek 284 clean rear.jpg
Tek 284 and 067-0508-00.jpg | 284 with [[067-0508-00]]
Tek 284 and 067-0508-00.jpg | 284 with [[067-0508-00]]
File:Tek 284 10MHz Square Wave.jpeg|200px|thumb|Tek 284 10 MHz Square Wave
File:Tek 284 1GHz Sine Wave.jpeg|thumb|Tek 284 1 GHz Sine Wave
File:Tek 284 Pulse Train Output.jpeg|200px|thumb|Tek 284 Pulse Train Output
File:Tek 284 Single Pulse OP.jpg|200px|thumb|Tek 284 Pulse Output
File:Tek 284 SN B102219 47ps Pulse on 20cm Air Line.jpg|200px|thumb|Tek 284 Pulse Output
</gallery>
</gallery>


Latest revision as of 04:54, 16 October 2024

Tektronix 284
Pulse generator
Front Panel

Produced from 1967 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 284 is a pulse generator introduced in July 1967. It was designed by Fred Kawabata. Its output modes include:

  • 70 ps risetime pulse, 200 mV, 50 kHz repetition rate, 1 μs pulse duration (5% duty cycle)
  • Sine wave, 1 GHz or 100 MHz, 100 mV
  • Square wave, 10 MHz, 1 MHz or 100 kHz, 10 mV, 100 mV, or 1 V

Only one mode can be used at a time. The pulse comes out one output connector. The sine wave and square wave come out another output connector. Both outputs are 50 Ω GR-874.

Links

Documents Referencing 284

Document Class Title Authors Year Links
Tekscope 1970 V2 N3 Jun 1970.pdf Article Tektronix Signal Sources 1970 2101 • 2901 • 114 • 115 • R116 • 106 • 191 • 284 • 140

Patents that may apply to 284

Page Title Inventors Filing date Grant date Links
Patent US 3453403A Power selection device Eldon Hoffman 1966-08-18 1969-07-01 115 • 140 • 141 • 141A • 144 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 284 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2101 • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903
Patent US 3510690A Transmission line coupled tunnel diode pulse generator Fred Kawabata 1967-07-17 1970-05-05 284

Internals

The 284 generates a 1 GHz sinewave using a 2N3478 RF NPN transistor-based oscillator.

The 284 generates the 70 ps risetime pulse using a 20 mA, 1.5 pF tunnel diode, D180, Tektronix part number 152-0329-00. D180 is mounted inside of a 50 Ω airline (rigid coaxial transmission line with only air between the center conductor and the shell). D180 is in series with the airline's center conductor. One end of the airline contains three resistors for biasing the tunnel diode and terminating the transmission line. The other end of the airline is the GR-874 pulse output connector. For each pulse (every 20 μs):

  • the biasing current is switched on, putting D180 close to its peak current
  • a capacitively coupled "tripper" applies a short current pulse to D180, causing it to switch to its high-voltage state
  • the biasing current is switched off, causing the tunnel diode to fall back to the low-voltage state

The tripper pulse is produced by a snap-off diode. Air gap capacitors couple the tripper pulse to the tunnel diode. These capacitors, C185 and C186, are drawn with dashed lines in the schematic because they are really just stray capacitances. One side of each capacitor is the unconnected center pin of the bulkhead-mount female SMB connectors in the side of the airline. The other side of the capacitor is the conductive tunnel diode mount in the core of the airline.

Modification kit 040-0487-00 changes the times selectable with the lead time switch.

Pictures

  • 3/4 View

    3/4 View

  • Rear Panel

    Rear Panel

  • Interior Top

    Interior Top

  • Interior Bottom

    Interior Bottom

  • Interior Left

    Interior Left

  • Interior Right

    Interior Right

  • Tunnel diode in housing

    Tunnel diode in housing

  • Oscillator

    Oscillator

  • Fast pulse output schematic

    Fast pulse output schematic

  • Pulser module drawing

    Pulser module drawing

  • 284 with 067-0508-00

    284 with 067-0508-00

  • Tek 284 10 MHz Square Wave

    Tek 284 10 MHz Square Wave

  • Tek 284 1 GHz Sine Wave

    Tek 284 1 GHz Sine Wave

  • Tek 284 Pulse Train Output

    Tek 284 Pulse Train Output

  • Tek 284 Pulse Output

    Tek 284 Pulse Output

  • Tek 284 Pulse Output

    Tek 284 Pulse Output

Components

Some Parts Used in the 284

Part Part Number(s) Class Description Used in
2N3478 151-0173-00 Discrete component NPN RF transistor 284
SMTD892 152-0329-00 Discrete component 19 mA, 1.5 pF tunnel diode 284 • 7T11 • 7T11A
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