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The 108 is a 1nS impulse generator and the predecessor of the more complex [[109]].
{{Instrument Sidebar
Repetition rate is 240 pps and max. amplitude is 10Vpk into 50 Ohm load.
|manufacturer=Tektronix
|model=108
|class=Pulse generator
|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]]
}}
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]].


[[Image:Tek_108.jpg|200px|thumb|left|Image magnified out from a flyer]]
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]].
 
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>
Tek 108 front.jpg | Front view
Tek 108 schem.png | Schematic
Tek 108 left.jpg|Left view, mercury switch
Tek 108 right.jpg | right view, selenium recitifier
Tek 108 output network.jpg | Output network, rear of N connector
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>
 
==Components==
{{Parts|108}}
 
[[Category:Pulse generators]]

Latest revision as of 00:39, 23 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

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