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The '''Tektronix 661''' is a [[sampling oscilloscope]] that was [[introduced in 1961]]. | The '''Tektronix 661''' is a [[sampling oscilloscope]] that was [[introduced in 1961]]. | ||
It accepts two plug-ins, a sampling unit and a timing unit. | It accepts two plug-ins, a sampling unit and a timing unit. | ||
==History== | |||
The 661 project was led by [[Norm Winningstad]]. | The 661 project was led by [[Norm Winningstad]]. | ||
In "Winning with People: The First 40 Years of Tektronix", Marshall Lee writes: | |||
<blockquote> | |||
During the early stages of the transition from tubes to transistors, | |||
however, computer research focused on emitter-coupled logic circuits, or ECL circuits, | |||
which proved much faster than conventional circuits, but also demanded higher-speed measuring instruments, | |||
which meant a much wider bandwidth. | |||
In response to ECL research, by 1962 Winningstad's group had produced the Type 661 sampling oscilloscope, | |||
which provided the answer to high speed and screen resolution. | |||
</blockquote> | |||
==Plug-ins== | |||
Four sampling units were made: | Four sampling units were made: | ||
* [[4S1]] (0.35 ns rise time) | * [[4S1]] (0.35 ns rise time) | ||