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7J20 (view source)

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{{Plugin Sidebar |
{{Plugin Sidebar
manufacturer=Tektronix | type=7J20|
|manufacturer=Tektronix
summary=Optical Spectrometer|
|series=7000-series scopes
image=Tek7J20.jpg|
|type=7J20
caption=Tektronix 7J20 in [[7633]] mainframe|
|summary=Optical Spectrometer
introduced=1975 |
|image=Tek7J20.jpg
discontinued=1976 |
|caption=Tektronix 7J20 in [[7633]] mainframe
series=7000-series scopes|
|introduced=1975
manuals=
|discontinued=1976
* [[Media:70-1642-00.pdf|Tektronix J20/7J20 Service Manual (PDF)]]
|manuals=
* [[Media:70-1641-00.pdf|Tektronix J20/7J20 Operators Manual (PDF)]]
* [[Media:70-1642-00.pdf|Tektronix J20/7J20 Service Manual]]
* [[Media:Tek 7j20 interim service manual.pdf|Tektronix J20/7J20 Interim Service Manual (PDF)]]
* [[Media:70-1641-00.pdf|Tektronix J20/7J20 Operators Manual]]
* [[Media:070-1743-00.pdf|Tektronix 016-1000-00 RSS External Normalizer Manual (PDF)]]
* [[Media:Tek 7j20 interim service manual.pdf|Tektronix J20/7J20 Interim Service Manual]]
* [[Media:TEK RSS Brochure.pdf|Tektronix J20/7J20 Brochure (PDF)]]
* [[Media:070-1743-00.pdf|Tektronix 016-1000-00 RSS External Normalizer Manual]]
* [[Media:RSS Applications.pdf|Tektronix J20/7J20 Application Notes 9 & 11 (PDF)]]
* [[Media:TEK RSS Brochure.pdf|Tektronix J20/7J20 Brochure]]
* [[Media:RSS R&D Article 11-1974.pdf|R/D Article - November 1974 (PDF)]]
* [[Media:RSS Applications.pdf|Tektronix J20/7J20 Application Notes 9 & 11]]
* [http://w140.com/tek_7J20_from_1975_cat.pdf Section in 1975 Catalog in 7J20 (PDF)]
* [[Media:RSS R&D Article 11-1974.pdf|R/D Article - November 1974]]
* [[Media:TEK 7J20 Advertisement 06-1975.pdf|Tektronix J20/7J20 Advertisement - June 1975 (PDF)]]
* [https://w140.com/tek_7J20_from_1975_cat.pdf Section in 1975 Catalog in 7J20]
* [[Media:Jere marrs rapid-scanning spectrometry.pdf|Jere Marrs, "Rapid-Scanning Spectrometry" (PDF)]]
* [[Media:TEK 7J20 Advertisement 06-1975.pdf|Tektronix J20/7J20 Advertisement - June 1975]]
* [[Media:Peter burke fast-scan spectrometry.pdf|Peter Burke "Fast-Scan Spectrometry" (PDF)]]
* [[Media:Jere marrs rapid-scanning spectrometry.pdf|Jere Marrs, "Rapid-Scanning Spectrometry"]]
* [[Media:Peter burke fast-scan spectrometry.pdf|Peter Burke "Fast-Scan Spectrometry"]]
}}
}}
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, 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.
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 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 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".
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.
It has controls for the optical components (grating, filters etc.) on one side and an input aperture on the other.
{{BeginSpecs}}
{{Spec | Spectral range | 250 nm to 1100 nm }}
{{Spec | Resolution |
* Grating A: ≤4 nm in a 400 nm span (selectable 300-700, 400-800, 500-900, 600-1000, or 700-1100 nm
* Grating B: ≤0.4 nm in a 40 nm span continuously variable through the spectral range }}
{{Spec | Slit | 10 to 5000 μm wide (1-2-5 sequence), 10 mm high }}
{{Spec | Filters | ND1, ND 2, 500 nm monopass, 800 nm monopass, UV block (≤400 nm), UV pass (250-330 nm), open (no filter) }}
{{Spec | Scan | 10 or 20 ms base sweep, 50 to 1000 ms (1–2–5) settings run successive 20 ms sweeps up to the selected integration time }}
{{Spec | Display span | Grating A, 40, 20, 10 or 4 nm/Div ; Grating B, 4, 2, 1 or 0.4 nm/Div }}
{{EndSpecs}}
==Price==
$12,000 in 1975 (~$61,000 in 2021 dollars)
==Links==
* [https://youtube.com/watch?v=7zR4Os6JEac 7J20 in operation @ VintageTek Museum] (YouTube)


==Internals==
==Internals==
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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.''
{{BeginSpecs}}
{{Spec | Spectral range | 250 nm to 1100 nm }}
{{Spec | Resolution (Grating A) | ≤4 nm in a 400 nm span (selectable 300-700, 400-800, 500-900, 600-1000, or 700-1100 nm }}
{{Spec | Resolution (Grating B) | ≤0.4 nm in a 40 nm span continuously variable through the spectral range }}
{{Spec | Slit | 10 to 5000 μm wide (1-2-5 sequence), 10 mm high }}
{{Spec | Filters | ND1, ND 2, 500 nm monopass, 800 nm monopass, UV block (≤400 nm), UV pass (250-330 nm), open (no filter) }}
{{Spec | Scan | 10 or 20 ms base sweep, 50 to 1000 ms (1-2-5) settings run successive 20 ms sweeps up to the selected integration time }}
{{Spec | Display span | Grating A, 40, 20, 10 or 4 nm/Div ; Grating B, 4, 2, 1 or 0.4 nm/Div }}
{{EndSpecs}}
==Price==
$12,000 in 1975 (~$61,000 in 2021 dollars)
==Links==
* [https://youtube.com/watch?v=7zR4Os6JEac 7J20 in operation @ VintageTek Museum] (YouTube)


==Pictures==
==Pictures==
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/69077...80454"

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