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7000 series readout system: Difference between revisions
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{{Instrument Sidebar | |||
|class=Subsystem | |||
|manufacturer=Tektronix | |||
|series= | |||
|model=7000-series readout system | |||
|summary= | |||
|image=Tek-7000-readout-board.jpg | |||
|caption=Classic 7000 series readout board (analog ROMs) | |||
|introduced=1969 | |||
|discontinued=1992 | |||
|designers=Barrie Gilbert | |||
|manuals= | |||
}} | |||
For the [[7000-series scopes]], a system was required to display the instrument state such as input range, time/div etc. alongside or within the display. Earlier solutions had included fiber-optical/mechanical displays to the side of the CRT such as those in the [[576|576 Curve Tracer]]. | For the [[7000-series scopes]], a system was required to display the instrument state such as input range, time/div etc. alongside or within the display. Earlier solutions had included fiber-optical/mechanical displays to the side of the CRT such as those in the [[576|576 Curve Tracer]]. | ||
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A sliding switch on the analog ROM readout board (internal to the scope) allows the operator to select "gate triggered" mode, in which the readout signal is produced only after a sweep has occurred. The advantage of this mode is that the beam is not interrupted while drawing the signal, however, if no sweep occurs there is no readout, and if the sweep is slow, the readout flickers. | A sliding switch on the analog ROM readout board (internal to the scope) allows the operator to select "gate triggered" mode, in which the readout signal is produced only after a sweep has occurred. The advantage of this mode is that the beam is not interrupted while drawing the signal, however, if no sweep occurs there is no readout, and if the sweep is slow, the readout flickers. | ||
In certain mainframes such as the [[7844]], [[7904A]] and [[7104]], turning the readout display intensity control past the maximum intensity setting switches readout into pulsed mode. | In certain mainframes such as the [[7844]], [[7904A]], [[7934]], and [[7104]], turning the readout display intensity control past the maximum intensity setting switches readout into pulsed mode. | ||
Depending on a second switch, readout occurs at the end of the sweep ("+ GATE") or when triggered by a back-panel "Graticule/Readout Single Shot" input. These scopes also have a "manual readout" button and similar controls for pulsed graticule illumination. | Depending on a second switch, readout occurs at the end of the sweep ("+ GATE") or when triggered by a back-panel "Graticule/Readout Single Shot" input. These scopes also have a "manual readout" button and similar controls for pulsed graticule illumination. | ||
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===Microcontroller-based Readout Board=== | ===Microcontroller-based Readout Board=== | ||
Finally, from 1989/1990 on, a third generation readout board designed around an 80C31 micro-controller replaced the previous versions in the last series of [[7104]], [[R7103]], [[R7844]], [[7904A]], [[7603]] and [[7623B]] models. This version no longer used any Tek-made special ICs, manufacture of which had been discontinued by that time. The board is part SMD, part through-hole. It is described in [ | Finally, from 1989/1990 on, a third generation readout board designed around an 80C31 micro-controller replaced the previous versions in the last series of [[7104]], [[R7103]], [[R7844]], [[7904A]], [[7603]] and [[7623B]] models. This version no longer used any Tek-made special ICs, manufacture of which had been discontinued by that time. The board is part SMD, part through-hole. | ||
It is described in | |||
[[Media:070-4593-00.pdf|this version of the 7904A manual]] | |||
(pages 288 through 291 describe the EPROM version above, while the 80C31 version is shown on pages 380 through 391). | |||
<gallery widths=300 heights=300> | <gallery widths=300 heights=300> | ||
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7000-readout-ctl-3.jpg | | 7000-readout-ctl-3.jpg | | ||
Microcontroller based readout board block diagram.jpg | Block diagram | Microcontroller based readout board block diagram.jpg | Block diagram | ||
Late 7603 with digital readout.jpg | Late model [[7603]] with μP readout | |||
</gallery> | </gallery> | ||
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* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/rep-und-kal-7603/Reparaturbericht%20TEKTRONIX%207603.htm Repair of readout and installation of readout board in another scope] (many photos, German text) | * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/rep-und-kal-7603/Reparaturbericht%20TEKTRONIX%207603.htm Repair of readout and installation of readout board in another scope] (many photos, German text) | ||
* [http://www.electronics-related.com/sci.electronics.design/thread/116046/readout-pin-on-oscilloscope-probes.php Thread about probe readout details] | * [http://www.electronics-related.com/sci.electronics.design/thread/116046/readout-pin-on-oscilloscope-probes.php Thread about probe readout details] | ||
* [[Media:7000 series scale factor readout.pdf|Tektronix 7000 Series Scale Factor Readout (PDF, | * [[Media:7000 series scale factor readout.pdf|Tektronix 7000 Series Scale Factor Readout (PDF, OCR)]] | ||
* [[7000 Series plug-in interface]] | * [[7000 Series plug-in interface]] | ||
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* '''Ω''' R5/C9 | * '''Ω''' R5/C9 | ||
</div> | </div> | ||
==Font comparison== | |||
<gallery> | |||
Font_160-2997-00.pdf|Font of the 1984 EPROM readout | |||
Font_160-2997-01.pdf|Font of the 1986 EPROM readout | |||
Font_160-2997-xx.pdf|Font comparison 1984 vs 1986 EPROM readout | |||
</gallery> | |||
{{Custom ICs|7000 series readout system}} | {{Custom ICs|7000 series readout system}} | ||
[[Category:7000 series scopes]] | [[Category:7000 series scopes]] | ||