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{{Instrument Sidebar | |||
|manufacturer=Tektronix | |||
|model=284 | |||
|class=Pulse generator | |||
|series= | |||
|summary=Pulse generator | |||
|image=Tek284-front.jpg | |||
|caption=Tek 284 front | |||
|introduced=1967 | |||
|discontinued=(?) | |||
|designers= | |||
|manuals= | |||
* [http://bama.edebris.com/download/tek/284/Tek%20284_v6.pdf Tektronix 284 Manual (PDF)] | |||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/284.html Tek 284 page at amplifier.cd] with detailed internals and repair/cal report | |||
* [[Media:Tek 284 fcp oct 1967.pdf|Tektronix 284 Factory Calibration Procedure, October 1967]] | |||
}} | |||
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]]. | ||
Its output modes include: | Its output modes include: | ||
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* Square wave, 10 MHz, 1 MHz or 100 kHz, 10 mV, 100 mV, or 1 V | * 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. | 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]]. | ||
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]]. | |||
The 284 generates a 1 GHz sinewave using a | The 284 generates a 1 GHz sinewave using a [[2N3478]] RF NPN transistor-based oscillator. | ||
[[2N3478]] RF NPN transistor-based oscillator. | |||
The 284 generates the 70 ps risetime pulse using a 20 mA, 1.5 pF tunnel diode, | 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, Tektronix part number [[152-0329-00]]. D180 is mounted | D180 is mounted inside of a 50 Ω airline (rigid coaxial transmission line with only air between the center conductor and the shell). | ||
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. | 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. | One end of the airline contains three resistors for biasing the tunnel diode and terminating the transmission line. | ||
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The tripper pulse is produced by a [[snap-off diode]]. | The tripper pulse is produced by a [[snap-off diode]]. | ||
Air gap capacitors couple the tripper pulse to the tunnel 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 | These capacitors, C185 and C186, are drawn with dashed lines in the schematic because they are really just stray capacitances. | ||
because they are really just stray capacitances. | One side of each capacitor is the unconnected center pin of the bulkhead-mount female [[SMB connector]]s in the side of the airline. | ||
One side of each capacitor is the unconnected center pin of the bulkhead-mount female | The other side of the capacitor is the conductive tunnel diode mount in the core of the airline. | ||
[[SMB connector]]s 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. | Modification kit [[040-0487-00]] changes the times selectable with the lead time switch. | ||
==See Also== | ==See Also== | ||
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[[Category:Pulse generators]] | [[Category:Pulse generators]] | ||