7J20: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|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 | ||
|introduced=1975 | |||
manuals= | |discontinued=1976 | ||
* [[Media: | |manuals= | ||
* [[Media: | * [[Media:070-1642-00.pdf|Tektronix J20/7J20 Service Manual]] | ||
* [[Media:Tek 7j20 interim service manual.pdf|Tektronix J20/7J20 Interim Service Manual | * [[Media:070-1641-00.pdf|Tektronix J20/7J20 Operators Manual]] | ||
* [[Media:070-1743-00.pdf|Tektronix 016-1000-00 RSS External Normalizer Manual | * [[Media:Tek 7j20 interim service manual.pdf|Tektronix J20/7J20 Interim Service Manual]] | ||
* [[Media:TEK RSS Brochure.pdf|Tektronix J20/7J20 Brochure | * [[Media:070-1743-00.pdf|Tektronix 016-1000-00 RSS External Normalizer Manual]] | ||
* [[Media:RSS Applications.pdf|Tektronix J20/7J20 Application Notes 9 & 11 | * [[Media:TEK RSS Brochure.pdf|Tektronix J20/7J20 Brochure]] | ||
* [[Media:RSS R&D Article 11-1974.pdf|R/D Article - November 1974 | * [[Media:RSS Applications.pdf|Tektronix J20/7J20 Application Notes 9 & 11]] | ||
* [ | * [[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 | * [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" | * [[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" | * [[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. ''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. | ||
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}} | {{BeginSpecs}} | ||
{{Spec | | {{Spec | Spectral range | 250 nm to 1100 nm }} | ||
{{Spec | Resolution | {{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 | 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 | 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 ( | {{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 }} | {{Spec | Display span | Grating A, 40, 20, 10 or 4 nm/Div ; Grating B, 4, 2, 1 or 0.4 nm/Div }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Price== | ==Price== | ||
$12,000 in 1975 ($ | $12,000 in 1975 (~$68,000 in 2023 dollars) | ||
==Links== | ==Links== | ||
* [https://vintagetek.org/rapid-scan-optical-spectrometer/ Rapid Scan Optical Spectrometer] @ VintageTek.org | |||
* [https://youtube.com/watch?v=7zR4Os6JEac 7J20 in operation @ VintageTek Museum] (YouTube) | * [https://youtube.com/watch?v=7zR4Os6JEac 7J20 in operation @ VintageTek Museum] (YouTube) | ||
* G.M.Ehemann Jr., ''[[Media:RCA_Engineer_1979-08-09.pdf|Rapid scan determination of optical spectra]]''. In ''RCA Engineer 25-2'', August/September 1979. Discusses application of the 7J20 with a [[P7001]] DPO and a PFP-11 computer to measure TV phosphor emission spectra. | |||
{{Documents|Link=7J20}} | |||
{{PatentLinks|7J20}} | |||
==Internals== | |||
The instrument is based on a [[wikipedia:Monochromator|Czerny-Turner Monochromator]], 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) ]] | |||
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) ]] | |||
==Pictures== | ==Pictures== | ||
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Tektronix-J20 UV Fiber Optic Sensor-Ring Adpater-Side-hires.JPG |J20 Mounting Ring Adapter Side | Tektronix-J20 UV Fiber Optic Sensor-Ring Adpater-Side-hires.JPG |J20 Mounting Ring Adapter Side | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|7J20}} | |||
{{Parts|J20}} | |||
[[Category:7000 series combined plugins]] | [[Category:7000 series combined plugins]] | ||
[[Category:7000 series special-function plugins]] | [[Category:7000 series special-function plugins]] | ||
[[Category: | [[Category:7000 series spectrum analyzer plugins]] | ||
[[Category:Optoelectronic instruments]] | [[Category:Optoelectronic instruments]] | ||
[[Category:Specifications needed]] | [[Category:Specifications needed]] |
Latest revision as of 05:10, 15 July 2024
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.
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.
Key Specifications
Spectral range | 250 nm to 1100 nm |
---|---|
Resolution |
|
Slit | 10 to 5000 μm wide (1-2-5 sequence), 10 mm high |
Filters | ND1, ND 2, 500 nm monopass, 800 nm monopass, UV block (≤400 nm), UV pass (250-330 nm), open (no filter) |
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 |
Display span | Grating A, 40, 20, 10 or 4 nm/Div ; Grating B, 4, 2, 1 or 0.4 nm/Div |
Price
$12,000 in 1975 (~$68,000 in 2023 dollars)
Links
- Rapid Scan Optical Spectrometer @ VintageTek.org
- 7J20 in operation @ VintageTek Museum (YouTube)
- G.M.Ehemann Jr., Rapid scan determination of optical spectra. In RCA Engineer 25-2, August/September 1979. Discusses application of the 7J20 with a P7001 DPO and a PFP-11 computer to measure TV phosphor emission spectra.
Documents Referencing 7J20
- (no results)
Patents that may apply to 7J20
Page | Title | Inventors | Filing date | Grant date | Links |
---|---|---|---|---|---|
Patent US 3562464A | Cam actuated switch having movable and fixed contacts on circuit board | Howard Vollum • Willem H Verhoef • Tony Sprando | 1968-10-07 | 1971-02-09 | Cam switches • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A38 • 5A45 • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AM503 |
Patent US 3886331A | Electronic scanning spectrophotometer system | Joseph Philip Schierer Jr | 1973-09-14 | 1975-05-27 | 7J20 |
Internals
The instrument is based on a Czerny-Turner Monochromator, in essence a narrow slit followed by a diffraction grating. A vidicon tube scans the optical spectrum and produces a periodic electric signal which is then displayed by the scope mainframe.
![](http://w140.com/tekwiki/images/thumb/0/07/7J20-principle.jpg/400px-7J20-principle.jpg)
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.
![](http://w140.com/tekwiki/images/thumb/8/8b/Tek_j20_interim_normalizer2.png/400px-Tek_j20_interim_normalizer2.png)
Pictures
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7J20 (plug-in part) in 7633 mainframe
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7J20 plug-in part and J20 spectrometer connected (catalog picture)
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7J20 with J20 in measurement setup (1975 catalog picture)
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7J20 with J20 in 7704A/P7001(1975 catalog picture)
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J20
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J20
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J20
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J20
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J20
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J20
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J20
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7J20
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7J20
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7J20
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7J20
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7J20
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7J20
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J20 UV Fiber Optic Sensor
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J20 UV Fiber Optic Sensor Head
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J20 UV Fiber Optic Sensor Slit
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J20 Mounting Ring Adapter Face
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J20 Mounting Ring Adapter Back
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J20 Mounting Ring Adapter Side
Components
Some Parts Used in the 7J20
Part | Part Number(s) | Class | Description | Used in |
---|---|---|---|---|
151-0261-00 | 151-0261-00 | Discrete component | dual PNP transistor | AM501 • AM502 • CG5001 • CG551AP • FG501 • FG502 • FG503 • OF150 • OF151 • OF152 • OF235 • OS261 • RM502A • R1140 • R5030 • R5031 • R7912 • 067-0679-00 • 067-0807-00 • 1101 • 1140A • 1141 • 1142 • 1350 • 145 • 1450 • 1480 • 1481 • 1482 • 1485 • 1501 • 1801 • 1900 • 1910 • 1980 • 213 • 26A1 • 26A2 • 2620 • 285 • 3A9 • 3A10 • 3S1 • 3S2 • 3S5 • 3S6 • 432 • 434 • 4501 • 454 • 4601 • 4602 • 4610 • 4612 • 4620 • 4632 • 4634 • 4701 • 475 • 492 • 492A • 492AP • 494 • 494P • 496 • 496P • 5A13N • 5A20N • 5A21N • 5A22N • 5A26 • 5L4N • 502A • 5030 • 5031 • 576 • 690SR • 7A22 • 7A29 • 7B51 • 7B71 • 7J20 • 7L5 • 7S11 • 7S12 • 7912AD |
155-0014-01 | 155-0014-00 • 155-0014-01 | Monolithic integrated circuit | analog-to-decimal converter | 7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001 |
155-0090-00 | 155-0090-00 • 155-0090-01 • 155-0090-02 | Monolithic integrated circuit | four-decade counter, latch and D/A converter | 7B85 • 7D01 • 7D12 • 7D15 • 7J20 |
155-0104-00 | 155-0104-00 | Monolithic integrated circuit | custom legend generator | 7J20 |
155-0105-00 | 155-0105-00 | Monolithic integrated circuit | custom legend generator | 7J20 |
155-0171-00 | 155-0171-00 | Monolithic integrated circuit | four-decade counter, latch and D/A converter | 7B85 • 7D01 • 7D12 • 7D15 • 7J20 |
Some Parts Used in the J20
Part | Part Number(s) | Class | Description | Used in |
---|---|---|---|---|
155-0106-00 | 155-0106-00 | Monolithic integrated circuit | normalizer | J20 • 492 • 492A • 492AP • 492P • 494 • 494P |