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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:070-1642-00.pdf|Tektronix J20/7J20 Service Manual]]
* [[Media:Tek 7j20 interim service manual.pdf|Tektronix J20/7J20 Interim Service Manual (PDF)]]
* [[Media:070-1641-00.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.


==Internals==
The 7J20 is very rare. According to [[Dennis Tillman]], ''Best estimate is ~40 were actually built.''
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) ]]
 
The 7J20 is very rare. According to Dennis Tillman, ''Best estimate is ~40 were actually built.''


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Spectral range | 250 nm to 1100 nm }}
{{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 |
{{Spec | Resolution (Grating B) | ≤0.4 nm in a 40 nm span continuously variable through the spectral range }}
* 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 (1-2-5) settings run successive 20 ms sweeps up to the selected integration time }}
{{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 (~$61,000 in 2021 dollars)
$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.
</gallery>
==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==
Line 83: Line 89:
</gallery>
</gallery>


{{Custom ICs|7J20}}
==Components==
{{Custom ICs|J20}}
{{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:Spectrum analyzers]]
[[Category:7000 series spectrum analyzer plugins]]
[[Category:Optoelectronic instruments]]
[[Category:Optoelectronic instruments]]


[[Category:Specifications needed]]
[[Category:Specifications needed]]

Latest revision as of 15:07, 6 October 2023

Tektronix 7J20
Optical Spectrometer
Tektronix 7J20 in 7633 mainframe

Compatible with 7000-series scopes

Produced from 1975 to 1976

Manuals
Manuals – Specifications – Links – Pictures

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
  • 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
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

</gallery>


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.

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.

Normalizer (click to enlarge)

Pictures

  • 7J20 (plug-in part) in 7633 mainframe

    7J20 (plug-in part) in 7633 mainframe

  • 7J20 plug-in part and J20 spectrometer connected (catalog picture)

    7J20 plug-in part and J20 spectrometer connected (catalog picture)

  • 7J20 with J20 in measurement setup (1975 catalog picture)

    7J20 with J20 in measurement setup (1975 catalog picture)

  • 7J20 with J20 in 7704A/P7001(1975 catalog picture)

    7J20 with J20 in 7704A/P7001(1975 catalog picture)

  • J20

    J20

  • J20

    J20

  • J20

    J20

  • J20

    J20

  • J20

    J20

  • J20

    J20

  • J20

    J20

  • 7J20

    7J20

  • 7J20

    7J20

  • 7J20

    7J20

  • 7J20

    7J20

  • 7J20

    7J20

  • 7J20

    7J20

  • J20 UV Fiber Optic Sensor

    J20 UV Fiber Optic Sensor

  • J20 UV Fiber Optic Sensor Head

    J20 UV Fiber Optic Sensor Head

  • J20 UV Fiber Optic Sensor Slit

    J20 UV Fiber Optic Sensor Slit

  • J20 Mounting Ring Adapter Face

    J20 Mounting Ring Adapter Face

  • J20 Mounting Ring Adapter Back

    J20 Mounting Ring Adapter Back

  • J20 Mounting Ring Adapter Side

    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 A/D 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
M092 155-0086-00 • 155-0087-00 • 155-0088-00 • 155-0104-00 • 155-0105-00 Monolithic integrated circuit legend generator 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
Retrieved from "https://w140.com/tekwiki/index.php?title=7J20&oldid=86234"