108: Difference between revisions

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intended for calibration of the [[517]].
intended for calibration of the [[517]].


It is the predecessor of the  
It is the predecessor of the more complex and faster [[109]].
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 pps and the  
It uses a [[mercury switch]] and [[selenium rectifiers]]. The output is through an [[N connector]].
maximum pulse amplitude is 10&nbsp;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
The price in July 1959 was $125. 
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  
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.
suddenly connected to the output load of the pulse generator, causing a sharp step in the
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.
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.


* [http://w140.com/tek_108.pdf Tektronix 108 Manual (PDF)]
* [http://w140.com/tek_108.pdf Tektronix 108 Manual (PDF)]


<gallery>
<gallery>
Image:Tek 108 front.jpg|Front view
Tek 108 front.jpg | Front view
File:Tek 108 schem.png|Schematic
Tek 108 schem.png | Schematic
Image:Tek 108 left.jpg|Left view, mercury switch
Tek 108 left.jpg|Left view, mercury switch
Image:Tek 108 right.jpg|Right view, selenium recitifier
Tek 108 right.jpg ight view, selenium recitifier
Image:Tek 108 output network.jpg|Output network, rear of N connector
Tek 108 output network.jpg | Output network, rear of N connector
Image:Tek 108 cat.jpg|Page 190 in the 1959 Catalog
Tek 108 cat.jpg|Page 190 in the 1959 Catalog
Image:Tek 108 mercury switch.png|Mercury switch
Tek 108 mercury switch.png | Mercury switch
</gallery>
</gallery>


[[Category:Pulse generators]]
[[Category:Pulse generators]]
[[Category:Introduced in 1959]]
[[Category:Introduced in 1959]]

Revision as of 11:09, 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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