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7D20: Difference between revisions
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title=Tektronix 7D20| | title=Tektronix 7D20| | ||
summary=Dual-channel digitizer| | summary=Dual-channel digitizer| | ||
image= | image=7d20-in-mf-manual.jpg| | ||
caption= | caption=7D20 in [[7603]] mainframe - picture from manual (better image needed!) | | ||
years=?| | years=1982 — ?| | ||
type=combined horizontal/vertical plugin| | type=combined horizontal/vertical plugin| | ||
series=[[7000-series scopes]]| | series=[[7000-series scopes]]| | ||
| Line 14: | Line 14: | ||
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 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 | 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 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. 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 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. | ||
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==Specifications== | ==Specifications== | ||
* Bandwidth: 0–70 MHz (DC), 10 Hz–70 MHz (AC) | |||
* Rise time: < 5 ns | |||
* Sampling Rate: 40 MSa/s | |||
* Resolution: 8 bit | |||
* 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 ns/Div — 20 s/Div and External: Roll Mode | |||
** External clock: < 10 kHz | |||
* Memory: 2 × 455 cells (alternating) analog / 1024 words digital | |||
* Deflection: 5 mV/Div to 5 V/Div (1–2–5) | |||
* Input impedance: 1 MΩ || 20 pF | |||
* GPIB features: SH1 AH1 T5 L3 SR1 RL1 PP0 DC1 DT1 C0 | |||
* Weight: 3.9 kg (8.5 lb) | |||
==Links== | |||
* [http://www.jvgavila.com/tek7603.htm 7D20 Repair Report] (with [[7603]]) | |||
==Pictures== | ==Pictures== | ||
[[Category:Image needed]] | |||
<gallery> | <gallery> | ||
</gallery> | </gallery> | ||
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[[Category:7000 series combined plugins]] | [[Category:7000 series combined plugins]] | ||
[[Category: | [[Category:Digital storage scopes]] | ||