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The Tektronix Type 221 is a miniature | {{Oscilloscope Sidebar | | ||
title=Tektronix 221 | | |||
summary=5 MHz miniature analog scope | | |||
image=Tek 221 1.jpg | | |||
caption=Tektronix 221 | | |||
years=1973 – ? | | |||
manuals= | |||
* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)] | |||
}} | |||
The Tektronix Type 221 is a miniature 5 MHz analog scope [[introduced in 1973]]. | |||
It has a switching power supply and built-in rechargeable batteries (which are | It has a switching power supply and built-in rechargeable batteries (which are | ||
a maintenance issue). It has a transformer-coupled trigger circuit which | a maintenance issue). It has a transformer-coupled trigger circuit which | ||
would seem to preclude DC level-based triggering. The trigger circuit uses a | would seem to preclude DC level-based triggering. The trigger circuit uses a | ||
[[1N3713]] 1mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier that drives the | [[1N3713]] 1mA [[tunnel_diodes|tunnel diode]]. The vertical output amplifier | ||
CRT plates is two opamps made from discrete transistors. One drives the top deflection | that drives the CRT plates is two opamps made from discrete transistors. One | ||
plate and the other drives the bottom plate. | drives the top deflection plate and the other drives the bottom plate. | ||
==Specifications== | |||
==Pictures== | |||
<gallery> | <gallery> | ||
| Line 16: | Line 28: | ||
Image:221-2.jpg|221 on top of 565 | Image:221-2.jpg|221 on top of 565 | ||
</gallery> | </gallery> | ||
[[Category:200 series scopes]] | |||
[[Category:Specifications needed]] | |||
Revision as of 03:30, 12 May 2014
The Tektronix Type 221 is a miniature 5 MHz analog scope introduced in 1973.
It has a switching power supply and built-in rechargeable batteries (which are a maintenance issue). It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. The trigger circuit uses a 1N3713 1mA tunnel diode. The vertical output amplifier that drives the CRT plates is two opamps made from discrete transistors. One drives the top deflection plate and the other drives the bottom plate.
Specifications
Pictures
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Front
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Panel of 221
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Probe of 221
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221 with orginal bag
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221 on top of 565
