108: Difference between revisions
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{{Instrument Sidebar | |||
|manufacturer=Tektronix | |||
|model=108 | |||
|class=Pulsegenerator | |||
|series= | |||
|summary=1 ns rise-time pulse generator | |||
|image=Tek 108 front.jpg | |||
|caption=Tek 108 front | |||
|introduced=1959 | |||
|discontinued=(?) | |||
|designers= | |||
|manuals= | |||
* [[Media:070-205.pdf|Tektronix 108 Manual]] (PDF) | |||
}} | |||
The '''Tektronix 108''' is a 1 ns rise-time pulse generator | The '''Tektronix 108''' is a 1 ns rise-time pulse generator | ||
intended for calibration of the [[517]]. | intended for calibration of the [[517]]. It is the predecessor of the more complex and faster [[109]]. | ||
Repetition rate of the 108 is 240 Hz and the maximum pulse amplitude is 10 V<sub>p</sub> into a 50 Ω load. | Repetition rate of the 108 is 240 Hz and the maximum pulse amplitude is 10 V<sub>p</sub> into a 50 Ω load. | ||
It uses a [[mercury switch]] and [[selenium rectifiers]]. The output is through an [[N connector]]. | It uses a [[mercury switch]] and [[selenium rectifiers]]. The output is through an [[N connector]]. | ||
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Referring to the output network photo below, current flows in from the left through the 1 kΩ resistor and charges the four red 0.1 μF capacitors in parallel. | Referring to the output network photo below, current flows in from the left through the 1 kΩ resistor and charges the four red 0.1 μF capacitors in parallel. | ||
When the mercury switch (terminals visible at lower right) closes, the capacitors are suddenly connected to the output load of the pulse generator, causing a sharp step in the output voltage. The starting voltage of the step is typically 0 V. The final voltage is adjustable, both in polarity and magnitude. The range is approximately | When the mercury switch (terminals visible at lower right) closes, the capacitors are suddenly connected to the output load of the pulse generator, causing a sharp step in the output voltage. | ||
The starting voltage of the step is typically 0 V. The final voltage is adjustable, both in polarity and magnitude. The range is approximately −10 V to 10 V. | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek 108 front.jpg | Front view | Tek 108 front.jpg | Front view | ||
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[[Category:Pulse generators]] | [[Category:Pulse generators]] | ||
Revision as of 05:40, 18 August 2021
The Tektronix 108 is a 1 ns rise-time pulse generator intended for calibration of the 517. It is the predecessor of the more complex and faster 109.
Repetition rate of the 108 is 240 Hz and the maximum pulse amplitude is 10 Vp into a 50 Ω load. It uses a mercury switch and selenium rectifiers. The output is through an N connector.
The price in July 1959 was $125.
Referring to the output network photo below, current flows in from the left through the 1 kΩ resistor and charges the four red 0.1 μF capacitors in parallel. When the mercury switch (terminals visible at lower right) closes, the capacitors are suddenly connected to the output load of the pulse generator, causing a sharp step in the output voltage. The starting voltage of the step is typically 0 V. The final voltage is adjustable, both in polarity and magnitude. The range is approximately −10 V to 10 V.
Pictures
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Front view
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Schematic
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Left view, mercury switch
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right view, selenium recitifier
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Output network, rear of N connector
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Page 190 in the 1959 Catalog
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Mercury switch
