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{{Plugin Sidebar|
{{Plugin Sidebar  
title=Tektronix 7D20|
|manufacturer=Tektronix
summary=Dual-channel digitizer|
|series=7000-series scopes
image=7d20-in-mf-manual.jpg|
|type=7D20  
caption=7D20 in [[7603]] mainframe - picture from manual (better image needed!) |
|summary=70 MHz dual-channel digitizer
years=1982 — ?|
|image=tek-7603-7d20.jpg  
type=combined horizontal/vertical plugin|
|caption=7D20 in [[7603]] mainframe  
series=[[7000-series scopes]]|
|introduced=1982
manuals=
|discontinued=1992
* [http://bama.edebris.com/download/tek/7d20/tek-7d20.pdf Tektronix 7D20 Manual (PDF)]
|manuals=
* [http://w140.com/smb/7d20_ref_sm.pdf Tektronix 7D20 Reference (OCR, PDF)]
* [[Media:070-3205-01.pdf|Tektronix 7D20 Reference Guide]]
* [http://w140.com/smb/7d20_svc_sm.pdf Tektronix 7D20 Service (OCR, PDF)]
* [[Media:070-3857-01.pdf|Tektronix 7D20 Operators Manual]] (OCR)
* [[Media:070-3858-01.pdf|Tektronix 7D20 Service Manual]] (OCR, split schematics, standard resolution)
* [[Media:070-3858-01 lowres.pdf|Tektronix 7D20 Service Manual]] (OCR, whole schematics, low resolution)
* [[Media:070-1728-00.pdf|Tektronix 7D20 Interfacing Guide]]
* [[Media:7D20 SMPS AnalysisDFT Apr1984.pdf|EDN Article by Clark Foley and Jim Lamb on SMPS diagnosis featuring the 7D20]]
 
{{ROM Images}}
* U200: [[Media:160-1164-02.bin|160-1164-02]]
* U300: [[Media:160-1165-02.bin|160-1165-02]]
* U400: [[Media:160-1163-02.bin|160-1163-02]]
* U500: [[Media:160-1162-03.bin|160-1162-03]]
* U600: [[Media:160-1676-02.bin|160-1676-02]]
* U700: [[Media:160-1757-03.bin|160-1757-03]]
}}
}}
The Tektronix 7D20 is a two-channel digitizing plug-in for [[7000-series scopes]].  It is a triple-width plug-in and provides both vertical and horizontal signals to the scope.
The '''Tektronix 7D20''' is a two-channel digitizing plug-in for [[7000-series scopes]].  It is a triple-width plug-in and provides both vertical and horizontal signals to the scope. The 7D20 can digitally store waveforms and has a [[GPIB interface]].
 
The 7D20 uses an analog shift register (CCD) for high-speed signal acquisition, and then digitizes the stored analog signal at a lower speed.  This design allowed the 7D20 to capture single-shot events at 40 MSamples/s even though this exceeded the speed of ADCs of the time.  The 7D20 can digitally store waveforms and has a [[GPIB interface]].  A microprocessor (68B09) in the plug-in controls most of its functions. 
 
The analog waveforms that are sent to the 7000-series mainframe are generated by vertical and horizontal DACs.  They are DACs outputs can be calibrated for scaling and shift so that signals are accurately displayed on the oscilloscope screen.  The 7D20 has a "roll" mode that emulates a paper roll chart.  It is as if the waveform is being drawn by a pen on the right side of the screen while the paper is being moved to the left at a constant rate. No equivalent to "roll" exists in analog scopes.  The Tektronix [[2212]] also has this feature.  


The 7D20 can give [[NVRAM errors]] that are often easy to fix.
A special version of the rackmount large screen [[R7603]] exists (Opt. 20), which provides a rear-panel [[GPIB]] connector to be used with the 7D20.


==Specifications==
{{BeginSpecs}}
{{BeginSpecs}}
{{Spec| Bandwidth      | 0–70 MHz (DC), 10 Hz–70 MHz (AC) }}
{{Spec| Bandwidth      | 0–70 MHz (DC), 10 Hz–70 MHz (AC) }}
{{Spec| Rise time      |  < 5 ns }}
{{Spec| Rise time      |  < 5 ns }}
{{Spec| Sampling Rate  |  40 MSa/s }}
{{Spec| Sampling Rate  |  40 MSps }}
{{Spec| Resolution      |  8 bit }}
{{Spec| Resolution      |  8 bit }}
{{Spec| Deflection      |  5 mV/Div to 5 V/Div (1–2–5) }}
{{Spec| Deflection      |  5 mV/Div to 5 V/Div (1–2–5) }}
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* 6 memory banks
* 6 memory banks
* 2 cursors
* 2 cursors
* GPIB features: SH1 AH1 T5 L3 SR1 RL1 PP0 DC1 DT1 C0
}}
}}
{{Spec| Weight | 3.9 kg (8.5 lb)}}
{{Spec| Weight | 3.9 kg (8.5 lb) }}
{{EndSpecs}}
{{EndSpecs}}
==Internals==
The 7D20 uses an analog shift register (CCD) for high-speed signal acquisition, and then digitizes the stored analog signal at a lower speed (see [[Patent US 4527117A]]).  This design allowed the 7D20 to capture single-shot events at 40 MSamples/s even though this exceeded the speed of ADCs of the time.  A microprocessor ([[Motorola 6809|68B09]]) in the plug-in controls most of its functions. 
The analog waveforms that are sent to the 7000-series mainframe are generated by vertical and horizontal DACs.  The DACs outputs can be calibrated for scaling and shift so that signals are accurately displayed on the oscilloscope screen. 
The 7D20 has a "roll" mode that emulates a paper roll chart, as if the waveform were being drawn by a pen on the right side of the screen while the paper is being moved to the left at a constant rate. No equivalent to "roll" exists in analog scopes.  The Tektronix [[2212]]/[[2216]], [[2220]]/[[2221]]/[[2230]] and possibly others also have this feature.
The 7D20 can give [[NVRAM errors]] that are often easy to fix.


==Links==
==Links==


* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/scope_7D20.htm 7D20 page @ amplifier.cd]
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/scope_7D20.htm 7D20 page @ amplifier.cd]
* http://www.barrytech.com/tektronix/tek7000/tek7d20.html
* [http://www.jvgavila.com/tek7603.htm EB5AGV's Tektronix R7603 / 7D20 page] - 7D20+[[R7603]] Repair Report
* [http://www.jvgavila.com/tek7603.htm 7D20 Repair Report] (with [[7603]])
* [http://pcbunn.cithep.caltech.edu/jjb/tektronix/7D20/tektronix_7d20.htm Another 7D20 repair]
* [http://www.barrytech.com/tektronix/tek7000/tek7d20.html 7D20 @ barrytech.com]


==Pictures==
==Pictures==


[[Category:Image needed]]
<gallery>
<gallery>
image:7d20-manual.jpg | 7D20 picture from manual
tek-7603-7d20.jpg
image:7d20-in-mf-manual.jpg| 7D20 picture in 7603 mainframe, from manual
7d20 plugin.jpg
Tek 7d20 1.jpg
Tek7d20.jpg
7d20-manual.jpg | 7D20 picture from manual
7d20-in-mf-manual.jpg| 7D20 picture in 7603 mainframe, from manual
Tek 7d20 rear.jpg
Tek 7d20 2.jpg
Tek 7d20 3.jpg
Tek 7d20 4.jpg
Tek 7d20 5.jpg
Tek 7d20 6.jpg
Tek 7d20 7.jpg
Tek 7d20 8.jpg
Tek 7d20 9.jpg
</gallery>
</gallery>


 
==Parts==
{{Parts|7D20}}


[[Category:7000 series combined plugins]]
[[Category:7000 series combined plugins]]
[[Category:Digital storage scopes]]
[[Category:Digital storage scopes]]
[[Category:GPIB interface]]
[[Category:GPIB interface]]
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