108: Difference between revisions
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more complex and faster [[109]]. | more complex and faster [[109]]. | ||
Repetition rate of the 108 is 240 pps and the | Repetition rate of the 108 is 240 pps and the | ||
maximum pulse amplitude is | maximum pulse amplitude is 10 Vpk into 50 Ohm load. | ||
It uses a [[mercury switch]] and [[selenium rectifiers]]. | It uses a [[mercury switch]] and [[selenium rectifiers]]. | ||
The price in July 1959 was $125. The output is through an | The price in July 1959 was $125. The output is through an | ||
[[ | [[N connector]]. | ||
Referring to the output network photo below, current flows in from the left | Referring to the output network photo below, current flows in from the left | ||
Revision as of 13:37, 7 July 2015
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 pps and the maximum pulse amplitude is 10 Vpk into 50 Ohm load. It uses a mercury switch and selenium rectifiers. The price in July 1959 was $125. The output is through an N connector.
Referring to the output network photo below, current flows in from the left through the 1k resistor and charges the four red 0.1 uF 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 0V. The final voltage is adjustable, both in polarity and magnitude. The range is approximately -10V to 10V.
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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
