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422: Difference between revisions
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caption=Tektronix 422 front | | caption=Tektronix 422 front | | ||
introduced=1966 | | introduced=1966 | | ||
discontinued= | discontinued=1975 | | ||
manuals= | manuals= | ||
* [http://w140.com/tek_422.pdf Tektronix 422 Manual (PDF)] | * [http://w140.com/tek_422.pdf Tektronix 422 Manual (PDF)] | ||
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* [http://w140.com/tek_422_product_reference_book.pdf Tektronix 422 Product Reference Book (PDF)] | * [http://w140.com/tek_422_product_reference_book.pdf Tektronix 422 Product Reference Book (PDF)] | ||
}} | }} | ||
The '''Tektronix Type 422''' is a 15 MHz portable dual-trace oscilloscope. It was available | The '''Tektronix Type 422''' is a 15 MHz portable dual-trace oscilloscope introduced in 1966. | ||
It was available withan optional battery back for operation without mains power. | |||
The trigger circuit in the 422 has a trigger amplifier driving a [[1N3719]] tunnel diode, D375, which | ==Specifications== | ||
[[Category:Specifications needed]] ''please add'' | |||
The post-deflection acceleration voltage is 4900 V. | |||
==Internals== | |||
Early versions use an [[8056]] Nuvistor tube for the front-end cathode follower. Later versions use a FET front | |||
end. The 8056 Nuvistor used in the input amplifier of the 422 can be replaced by a [[MPF102]] JFET. | |||
The trigger circuit in the 422 has a trigger amplifier driving a [[1N3719]] [[tunnel diode]], D375, which | |||
acts as a Schmitt trigger. The trigger amplifier has a nonlinear deadband diode circuit in the | acts as a Schmitt trigger. The trigger amplifier has a nonlinear deadband diode circuit in the | ||
negative feedback path. What results is high gain for small signals (little or no negative | negative feedback path. What results is high gain for small signals (little or no negative | ||
| Line 32: | Line 38: | ||
D405, and the current pulse switches D405 to the high-voltage state, which starts a sweep. | D405, and the current pulse switches D405 to the high-voltage state, which starts a sweep. | ||
==Links== | |||
== | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
File:Tek 422 front.jpg | |||
File:Tek 422 side.jpg | |||
File:Tek 422 trigger.png|Trigger circuit | |||
File:Tek 422 sweep.png|Sweep circuit | |||
File:Tek 422 vertamp.png|Vertical amplifier circuit | |||
File:Tek 422 inputamp.png|Input amplifier circuit | |||
File:Tek 422 horizamp.png|Horizontal amplifier circuit | |||
File:Tek 422 crt.png|CRT circuit | |||
File:422 mpf102 cal.jpg | File:422 mpf102 cal.jpg | ||
File:Tek 422 front part rear.jpg | |||
File:Tek 422 left int.jpg | |||
File:Tek 422 ps.jpg | |||
File:Tek 422 right int.jpg | |||
File:Tek 422 top.jpg | |||
File:Tek 422 trig int.jpg | |||
File:Tek 422 vert amp.jpg | |||
File:Tek 422 vert amp2.jpg | |||
File:Tek 422 vert input amps.jpg | |||
File:Tek-422 lvps2.png|ac-dc power supply | |||
File:Tek 422 acps.png|ac power supply | |||
File:422 8056 mpf102.jpg|[[MPF102]] replacing [[8056]] | File:422 8056 mpf102.jpg|[[MPF102]] replacing [[8056]] | ||
File:Wellenkino 422.jpg | File:Wellenkino 422.jpg | ||