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7J20: Difference between revisions
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series=[[7000-series scopes]]| | series=[[7000-series scopes]]| | ||
manuals= | manuals= | ||
* [[Media:70-1642-00.pdf|Tektronix J20/7J20 Service Manual (PDF)]] | |||
* [[Media:70-1641-00.pdf|Tektronix J20/7J20 Operators Manual (PDF)]] | |||
* [[Media:Tek 7j20 interim service manual.pdf|Tektronix J20/7J20 Interim Service Manual (PDF)]] | |||
* [[Media:070-1743-00.pdf|Tektronix 016-1000-00 RSS External Normalizer Manual (PDF)]] | |||
* [[Media:TEK RSS Brochure.pdf|Tektronix J20/7J20 Brochure (PDF)]] | |||
* [[Media:RSS Applications.pdf|Tektronix J20/7J20 Application Notes 9 & 11 (PDF)]] | |||
* [[Media:RSS R&D Article 11-1974.pdf|R/D Article - November 1974 (PDF)]] | |||
* [http://w140.com/tek_7J20_from_1975_cat.pdf Section in 1975 Catalog in 7J20 (PDF)] | * [http://w140.com/tek_7J20_from_1975_cat.pdf Section in 1975 Catalog in 7J20 (PDF)] | ||
* [[Media:Jere marrs rapid-scanning spectrometry | * [[Media:TEK 7J20 Advertisement 06-1975.pdf|Tektronix J20/7J20 Advertisement - June 1975 (PDF)]] | ||
* [[Media:Peter burke fast-scan spectrometry | * [[Media:Jere marrs rapid-scanning spectrometry.pdf|Jere Marrs, "Rapid-Scanning Spectrometry" (PDF)]] | ||
* [[Media:Peter burke fast-scan spectrometry.pdf|Peter Burke "Fast-Scan Spectrometry" (PDF)]] | |||
}} | }} | ||
The '''Tektronix 7J20''', which only appears in the 1975 catalog, is a "rapid scan" optical spectrometer for the 250 nm to 1100 nm region. | The '''Tektronix 7J20''', which only appears in the 1975 catalog, | ||
Rapid scan means that it can capture the spectrum quickly enough to show spectral changes at temporal resolution of a few milliseconds. | is a "rapid scan" optical spectrometer for the 250 nm to 1100 nm region. | ||
Rapid scan means that it can capture the spectrum quickly enough | |||
to show spectral changes at temporal resolution of a few milliseconds. | |||
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 instrument is based on a [ | ==Internals== | ||
in essence a narrow slit followed by a [ | The instrument is based on a [[wikipedia:Monochromator|Czerny-Turner Monochromator]], | ||
A [ | in essence a narrow slit followed by a [[wikipedia:Diffraction grating|diffraction grating]]. | ||
A [[wikipedia: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 | |||
The internal vidicon horizontal scan voltage corresponds to wavelength, | |||
but not in a linear way. | |||
To provide a linear nm/div horizontal display on the 7000-series mainframe, | |||
the vidicon horizontal scan signal is passed through a function generator IC, | |||
the [[155-0106-00]] (U1550 and U1590), | |||
which implements an interpolated lookup table. | |||
Inside the J20, there are 40 trimmer potentiometers that allow the lookup function to be tweaked | |||
so that the horizontal scale of the system is accurate. | |||
[[File:Tek_j20_interim_normalizer2.png | thumb | 400px | center | Normalizer (click to enlarge) ]] | |||
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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==Links== | ==Links== | ||
* [https://youtube.com/watch?v=7zR4Os6JEac | * [https://youtube.com/watch?v=7zR4Os6JEac 7J20 in operation @ VintageTek Museum] (YouTube) | ||
==Pictures== | ==Pictures== | ||
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7J20_complete.jpg | 7J20 plug-in part and J20 spectrometer connected (catalog picture) | 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) | 7J20_from_1975_cat.jpg | 7J20 with J20 in measurement setup (catalog picture) | ||
Tek j20 internal 1.jpg|J20 | |||
Tek j20 internal 2.jpg|J20 | |||
Tek j20 internal 3.jpg|J20 | |||
Tek j20 internal 4.jpg|J20 | |||
Tek j20 internal 5.jpg|J20 | |||
Tek j20 internal 6.jpg|J20 | |||
Tek j20 front 1.jpg|J20 | |||
Tek 7j20 1.jpg|7J20 | |||
Tek 7j20 2.jpg|7J20 | |||
Tek 7j20 3.jpg|7J20 | |||
Tek 7j20 4.jpg|7J20 | |||
Tek 7j20 5.jpg|7J20 | |||
Tek 7j20 6.jpg|7J20 | |||
Tektronix-J20 UV Fiber Optic Sensor-Full-lores.JPG | J20 UV Fiber Optic Sensor | |||
Tektronix-J20 UV Fiber Optic Sensor-Head-lores.JPG | J20 UV Fiber Optic Sensor Head | |||
Tektronix-J20 UV Fiber Optic Sensor-Slit-lores.JPG | J20 UV Fiber Optic Sensor Slit | |||
Tektronix-J20 Ring Adapter-Face-hires.JPG | J20 Mounting Ring Adapter Face | |||
Tektronix-J20 UV Fiber Optic Sensor-Ring Adpapter-Back-hires.JPG |J20 Mounting Ring Adapter Back | |||
Tektronix-J20 UV Fiber Optic Sensor-Ring Adpater-Side-hires.JPG |J20 Mounting Ring Adapter Side | |||
</gallery> | </gallery> | ||
[[Category:7000 series combined plugins]] | [[Category:7000 series combined plugins]] | ||
[[Category:7000 series special-function plugins]] | [[Category:7000 series special-function plugins]] | ||
[[Category:Spectrum | [[Category:Spectrum analyzers]] | ||
[[Category:Optoelectronic instruments]] | [[Category:Optoelectronic instruments]] | ||
[[Category:Specifications needed]] | [[Category:Specifications needed]] | ||