108: Difference between revisions
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Tek 108 schem.png | Schematic | Tek 108 schem.png | Schematic | ||
Tek 108 left.jpg|Left view, mercury switch | Tek 108 left.jpg|Left view, mercury switch | ||
Tek 108 right.jpg | Tek 108 right.jpg | right view, selenium recitifier | ||
Tek 108 output network.jpg | Output network, rear of N connector | Tek 108 output network.jpg | Output network, rear of N connector | ||
Tek 108 cat.jpg|Page 190 in the 1959 Catalog | Tek 108 cat.jpg|Page 190 in the 1959 Catalog |
Revision as of 12:10, 26 March 2017
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.
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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