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The Tektronix 108 is a 1ns-risetime pulse generator.
{{Instrument Sidebar
It is the predecessor of the
|manufacturer=Tektronix
more complex and faster [[109]].
|model=108
Repetition rate of the 108 is 240 pps and the
|class=Pulse generator
maximum pulse amplitude is 10Vpk into 50 Ohm load.
|series=
It uses a [[mercury switch]] and [[selenium rectifiers]].
|summary=1 ns rise-time pulse generator
The price in July 1959 was $125.  The output is through an
|image=Tek 108 front.jpg
[[Connectors#N|N connector]].
|caption=Tek 108 front
|introduced=1959
|discontinued=(?)
|designers=
|manuals=
* [[Media:070-205.pdf|Tektronix 108 Manual]]
}}
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]].


Referring to the output network photo below, current flows in from the left
Repetition rate of the 108 is 240 Hz and the maximum pulse amplitude is 10 V<sub>p</sub> into a 50 Ω load.  
through the 1k resistor and charges the four red 0.1 uF capacitors in parallel.
It uses a [[mercury switch]] and [[selenium rectifiers]]. The output is through an [[N connector]].
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.


* [http://w140.com/tek_108.pdf Tektronix 108 Manual (PDF)]
The price in July 1959 was $125 ($1,300 in 2023 dollars).


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.
In serial numbers 101 through 226, Type 108 units use [[selenium rectifiers]] in the power supply and a [[120-133]] power transformer.
Starting with serial number 227, Type 108 units use silicon rectifiers in the power supply and a [[120-108]] power transformer.
==Pictures==
<gallery>
<gallery>
Image:Tek 108 front.jpg|Front view
Tek 108 front.jpg | Front view
Image:Tek 108 left.jpg|Left view, mercury switch
Tek 108 schem.png | Schematic
Image:Tek 108 right.jpg|Right view, selenium recitifier
Tek 108 left.jpg|Left view, mercury switch
Image:Tek 108 output network.jpg|Output network, rear of N connector
Tek 108 right.jpg | right view, selenium recitifier
Image:Tek 108 cat.jpg|Page 190 in the 1959 Catalog
Tek 108 output network.jpg | Output network, rear of N connector
Image:Tek 108 approx schem.png|Approximate schematic
Tek 108 cat.jpg|Page 190 in the 1959 Catalog
Tek 108 mercury switch.png | Mercury switch
Tek type 108 late.jpeg| Late model 108 with silicon power rectifiers
</gallery>
</gallery>
==Components==
{{Parts|108}}
[[Category:Pulse generators]]

Latest revision as of 23:39, 22 October 2023

Tektronix 108
1 ns rise-time pulse generator
Tek 108 front

Produced from 1959 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

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 ($1,300 in 2023 dollars).

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.

In serial numbers 101 through 226, Type 108 units use selenium rectifiers in the power supply and a 120-133 power transformer. Starting with serial number 227, Type 108 units use silicon rectifiers in the power supply and a 120-108 power transformer.

Pictures

  • Front view

    Front view

  • Schematic

    Schematic

  • Left view, mercury switch

    Left view, mercury switch

  • right view, selenium recitifier

    right view, selenium recitifier

  • Output network, rear of N connector

    Output network, rear of N connector

  • Page 190 in the 1959 Catalog

    Page 190 in the 1959 Catalog

  • Mercury switch

    Mercury switch

  • Late model 108 with silicon power rectifiers

    Late model 108 with silicon power rectifiers

Components

Some Parts Used in the 108

Part Part Number(s) Class Description Used in
120-108 120-108 Discrete component power transformer 108
120-133 120-133 Discrete component power transformer 108
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