221: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 23: Line 23:
that drives the CRT plates is two opamps made from discrete transistors.  One  
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.
drives the top deflection plate and the other drives the bottom plate.
A version made for IBM has a single-sweep function not found on the standard 221.


==Pictures==
==Pictures==
Line 33: Line 35:
221-2.jpg|221 on top of 565
221-2.jpg|221 on top of 565
Tek 221 trace2.jpg
Tek 221 trace2.jpg
IBM Variant|221_IBM_Version.jpg
Single Sweep|Option 221_Single_Sweep.jpg
</gallery>
</gallery>


[[Category:200 series scopes]]
[[Category:200 series scopes]]

Revision as of 06:47, 11 June 2019

{{{manufacturer}}} 
5 MHz miniature analog scope
Tektronix 221

Produced from 1975 to 1991

Manuals
Manuals – Specifications – Links – Pictures

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.

A version made for IBM has a single-sweep function not found on the standard 221.

Pictures