7D20: Difference between revisions

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-{{Plugin Sidebar|
+{{Plugin Sidebar
-title=Tektronix 7D20|
+|manufacturer=Tektronix
-summary=Dual-channel digitizer|
+|series=7000-series scopes
-image=Image needed.jpg|
+|type=7D20
-caption=Image needed|
+|summary=70 MHz dual-channel digitizer
-years=?|
+|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 7D20 can digitally store waveforms and has a [[GPIB interface]].
+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.
+{{BeginSpecs}}
+{{Spec| Bandwidth       | 0–70 MHz (DC), 10 Hz–70 MHz (AC) }}
+{{Spec| Rise time       |  < 5 ns }}
+{{Spec| Sampling Rate   |  40 MSps }}
+{{Spec| Resolution      |  8 bit }}
+{{Spec| Deflection      |  5 mV/Div to 5 V/Div (1–2–5) }}
+{{Spec| Input impedance |  1 MΩ // 20 pF }}
+{{Spec| Time base |
+* 50 ns/Div — 1 μs/Div: Equivalent Time Mode
+* 2 μs/Div  — 200 μs/Div: Extended Real Time Mode
+* 500 μs/Div — 50 ms/Div: Real Time Mode
+* 100 ms/Div — 20 s/Div and External: Roll Mode
+}}
+{{Spec| External clock  |  < 10 kHz }}
+{{Spec| Memory          |  2 × 455 cells (alternating) analog / 1024 words digital }}
+{{Spec| Features |
+* 2 channels
+* 6 memory banks
+* 2 cursors
 }}
-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.
+{{Spec| Weight | 3.9 kg (8.5 lb) }}
+{{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 7D20 uses an analog shift register 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 40Msamp/sec even though exceeded the speed of ADCs of the time.  The 7D20 can digitally store waveforms and has GPIB.  A microprocessor 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 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 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.
-==Specifications==
+==Links==
+* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/scope_7D20.htm 7D20 page @ amplifier.cd]
+* [http://www.jvgavila.com/tek7603.htm EB5AGV's Tektronix R7603 / 7D20 page] - 7D20+[[R7603]] Repair Report
+* [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==
 <gallery>
+tek-7603-7d20.jpg
+d20 plugin.jpg
+Tek 7d20 1.jpg
+Tek7d20.jpg
+d20-manual.jpg | 7D20 picture from manual
+d20-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>
+==Parts==
+{{Parts|7D20}}
 [[Category:7000 series combined plugins]]
-[[Category:Specifications needed]]
+[[Category:Digital storage scopes]]
-[[Category:Image needed]]
+[[Category:GPIB interface]]