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7D20: Difference between revisions
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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 ([[Motorola 6809|68B09]]) in the plug-in controls most of its functions. | 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 ([[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 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 has 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. | ||