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The Tektronix 7D20 is a two-channel digitizing plug-in for 7000-series | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|series=7000-series scopes | |||
|type=7D20 | |||
|summary=70 MHz dual-channel digitizer | |||
|image=tek-7603-7d20.jpg | |||
|caption=7D20 in [[7603]] mainframe | |||
|introduced=1982 | |||
|discontinued=1992 | |||
|manuals= | |||
* [[Media:070-3205-01.pdf|Tektronix 7D20 Reference Guide]] | |||
* [[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 | |||
}} | |||
{{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 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== | |||
* [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 | |||
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> | |||
==Parts== | |||
{{Parts|7D20}} | |||
[[Category:7000 series combined plugins]] | |||
[[Category:Digital storage scopes]] | |||
[[Category:GPIB interface]] |