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7J20: Difference between revisions
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A [https://en.wikipedia.org/wiki/Vidicon vidicon tube] scans the optical spectrum and produces a periodic electric signal which is then displayed by the scope mainframe. | A [https://en.wikipedia.org/wiki/Vidicon vidicon tube] scans the optical spectrum and produces a periodic electric signal which is then displayed by the scope mainframe. | ||
[[File:7J20-principle.jpg | thumb | 400px | center | Operating principle (click to enlarge) ]] | [[File:7J20-principle.jpg | thumb | 400px | center | Operating principle (click to enlarge) ]] | ||
The spectrometer is packaged in two enclosures linked by an umbilical cable. The 7J20 is a 2-wide plug-in for [[7000-series scopes]] containing the sweep timing and mainframe interface circuits. The external enclosure is labeled "J20". It has controls for the optical components (grating, filters etc.) on one side and an input aperture on the other. | |||
The 7J20 is very rare. According to Dennis Tillman, ''Best estimate is ~40 were actually built.'' | The 7J20 is very rare. According to Dennis Tillman, ''Best estimate is ~40 were actually built.'' | ||
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<gallery> | <gallery> | ||
Tek7J20.jpg | Tek7J20.jpg | 7J20 (plug-in part) in [[7633]] mainframe | ||
7J20_complete.jpg | 7J20 plug-in part and J20 spectrometer connected (catalog picture) | |||
7J20_from_1975_cat.jpg | 7J20 with J20 in measurement setup (catalog picture) | |||
</gallery> | </gallery> | ||