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7D20: Difference between revisions
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|series=7000-series scopes | |series=7000-series scopes | ||
|type=7D20 | |type=7D20 | ||
|summary=70 MHz | |summary=70 MHz dual-channel digitizer | ||
|image=tek-7603-7d20.jpg | |image=tek-7603-7d20.jpg | ||
|caption=7D20 in [[7603]] mainframe | |caption=7D20 in [[7603]] mainframe | ||
|introduced= | |introduced=1982 | ||
|discontinued=1992 | |discontinued=1992 | ||
|manuals= | |manuals= | ||
* [[Media:070-3205-01.pdf|Tektronix 7D20 Reference Guide]] | * [[Media:070-3205-01.pdf|Tektronix 7D20 Reference Guide]] | ||
* [[Media:070-3857-01.pdf|Tektronix 7D20 Operators Manual]] (OCR) | * [[Media:070-3857-01.pdf|Tektronix 7D20 Operators Manual]] (OCR) | ||
* [[Media:070-3858-01.pdf|Tektronix 7D20 Service 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: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 | * [[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]]. | ||
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}} | {{BeginSpecs}} | ||
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==Internals== | ==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. 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 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 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]] also | 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. | The 7D20 can give [[NVRAM errors]] that are often easy to fix. | ||
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</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]] | ||