517: Difference between revisions
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The 517 closely resembles a scope that Tektronix developed under a contract | The 517 closely resembles a scope that Tektronix developed under a contract | ||
for the US military during 1949 and 1950. (See link below.) | for the US military during 1949 and 1950. (See link below.) | ||
Tektronix engineer Frank Hood recollects: | |||
<blockquote> | |||
"A lot of progress was made in 1949 and 1950. Work was well underway by Logan Belleville, Dick Rhiger and Howard on the high speed scope, the 517. This used some brand new circuitry, distributed (or chain) amplifiers, using 16 to 20 tubes in each stage to get the power needed to handle the high frequencies. Our best prediction at that time was that there were only about 30 to 50 people in the whole world who had need of a scope with 60 to 100 megacycle bandwidth. As it turned out, when we brought out a higher speed scope, people were able to design equipment of greater bandwidth and needed even faster measuring instruments. The cycle was regenerative. Having faster, more accurate measuring tools created a demand for even more measuring tools. We eventually sold several thousand of this instrument." | |||
</blockquote> | |||
The external power supply and oscilloscope are connected by a removable cable | The external power supply and oscilloscope are connected by a removable cable | ||