221: Difference between revisions
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drives the top deflection plate and the other drives the bottom plate. | drives the top deflection plate and the other drives the bottom plate. | ||
MOD 290A is found on a version made for IBM, which adds a Single Sweep function, and a "Property of IBM" engraving. | |||
==Pictures== | ==Pictures== | ||
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221-2.jpg|221 on top of 565 | 221-2.jpg|221 on top of 565 | ||
Tek 221 trace2.jpg | Tek 221 trace2.jpg | ||
221 IBM Version.jpg|IBM | 221 IBM Version.jpg| MOD 290A variant for IBM | ||
221 Single_Sweep.jpg| | 221 Single_Sweep.jpg| MOD 290A variant for IBM | ||
</gallery> | </gallery> | ||
[[Category:200 series scopes]] | [[Category:200 series scopes]] | ||
Revision as of 17:25, 14 June 2019
The Tektronix Type 221 is a miniature 5 MHz analog scope introduced in 1973.
Key Specifications
- please add
Internals
The 221 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 1 mA 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.
MOD 290A is found on a version made for IBM, which adds a Single Sweep function, and a "Property of IBM" engraving.
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
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MOD 290A variant for IBM
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MOD 290A variant for IBM
