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7D20: Difference between revisions
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* U700: [[Media:160-1757-03.bin|160-1757-03]] | * U700: [[Media:160-1757-03.bin|160-1757-03]] | ||
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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. | |||
{{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 (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. | 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. | ||