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R7912: Difference between revisions
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Separated into 7912 (series), R7912, 7912AD and 7912HB
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{{Oscilloscope Sidebar | |||
|manufacturer=Tektronix | |||
|series=7000-series scopes | |||
|model=R7912 | |||
|summary=500 MHz digitizer | |||
|image=USA Tek R7912 FrontWork.jpg | |||
|caption=Tektronix R7912AD with a modern monitor | |||
|introduced=1973 | |||
|discontinued=1978 | |||
|designers=Carlo Infante;Jim Cavoretto;Al Allworth;Don Roberts;Stu McNaughton;Walt Lowy;Ray Hayes;Ken Hawken;Bob Culter;Hal Cobb;Ed Ritz;Bo Janko | |||
|manuals= | |||
* [[Media:070-1590-00.pdf|Tektronix R7912 Service Manual]] | |||
* [[Media:070-1888-00.pdf|1350 (aka 067-0679-00) Memory Display Unit for R7912]] | |||
* [[Media:Waveform Digitizing Instruments (R7912).pdf|Waveform Digitizing Instruments (R7912) Brochure]] | |||
* [[Media:tek_7912_and_related_digitizer_docs.pdf|7912 and related digitizer documents]] | |||
{{ROM Images}} | |||
''missing, please add'' | |||
}} | |||
The '''Tektronix R7912''', introduced in September 1973, is a digitizer that achieved a bandwidth of 500 MHz with a [[7A19]] vertical amplifier plug-in. | |||
It was also possible, like in the [[7904]] scope, to access the CRT deflection plates directly through a [[7A21N]] plug-in and achieve a bandwidth of 1 GHz, | |||
albeit at reduced sensitivity (4 V/Div) and loss of triggering and readout functions. | |||
Some customers further modified the stock 7912 to increase bandwidth up to 3 GHz in special applications (see literature links below). | |||
The [[7912AD]] replaced the R7912 in 1978. | |||
{{MissingSpecs}} | |||
==Internals== | |||
The reading beam operates differently depending on the output mode. In TV mode, the reading beam scans the target in a horizontal format similar to that used in conventional television systems, and a video output compatible with TV monitors is generated. In Digital mode, the reading beam scans the target vertically, in 512 discrete steps for each of 512 horizontal positions. | |||
Waveforms are converted to digital, stored in memory, and can be read by a computer. | |||
The R7912 used the [[7000 series readout system]] writing readout characters onto the storage target, which would become part of the output signal in the NON STORE mode. | |||
The R7912 had a proprietary digital interface. A card for interfacing to a DEC PDP-11 was available, among other options. | |||
The Tektronix 067-0679-00 aka [[1350|1350 Digital Display Controller]] or "Memory Display Unit" is an external module that interfaces the R7912 to X-Y monitors. | |||
Tek also offered configurations with multiple R7912s on a common controller within the [[WP2000]] series. | |||
==Links== | |||
* [https://www.radiomuseum.org/forum/tektronix_r7912_transient_digitizer.html Tek R7912 @ radiomuseum.org] | |||
* [[Media:Tek retiree news 2012 11 nov.pdf|Hale Farley, ''The introduction of the R7912'']] in Tek Retirees Newsletter 11/2012 | |||
* [[Patent US 3748585A|US Patent 3748585: ''Silicon Diode Array Scan Converter Tube and Method of Operation''. Culter et al, July 1973.]] | |||
* [[Media:Rochester LLE Review Volume 25.pdf|University of Rochester LLE Review, Oct-Dec 1985]] mentioning the '''LM7912A''', a Lockheed-modified R7912 variant having ''"a bandwidth of 3.5 GHz at the -3 dB point, less than 5% undershoot and overshoot, with a 12-bit output (2 mV/bit)"'' | |||
* [[Media:Lockheed report-lmsc-d628276.pdf|Lockheed Palo Alto Research Lab study for LLL (June 1978)]] describing the LM7912 Enhanced Performance Transient Digitizer, claiming 3 GHz bandwidth | |||
* [[Media:Boyer data acq ebeam fus acc.pdf|William B. Boyer, ''Data Acquisition and Processing on Electron Beam Fusion Accelerators''. IEEE Transactions on Nuclear Science Vol.NS-25, No. 1, February 1978]] | |||
{{Documents|Link=R7912}} | |||
==See Also== | |||
* [[7912AD]], [[7912HB]] | |||
* [[WP2051]], [[WP2052]] | |||
* [[MP1101]] | |||
* [[SCD1000]], [[SCD5000]] | |||
* [[670-6466-00]] 7912 AD plug-in interface extender | |||
* [[067-0854-00]] Calibration Kit | |||
* [[067-0679-99]] R7912 Demo Unit | |||
==Pictures== | |||
<gallery> | |||
USA Tek R7912 FrontWork.jpg | R7912 connected to a modern video monitor. Note 7000-style readout. | |||
R7912 1.jpg | R7912 front | |||
R7912 2.jpg | R7912 controls | |||
R7912 3.jpg | R7912 rear | |||
Tek wp2000 2.jpg|067-0679-00 front next to [[608]] monitor | |||
Tek wp2000 3.jpg|067-0679-00 rear next to [[608]] monitor | |||
Tek wp2000 1.jpg|067-0679-00 detail | |||
067-0679-00.jpg |067-0679-00 aka [[1350]] | |||
</gallery> | |||
==Components== | |||
{{Parts|R7912}} | |||
{{Custom ICs|7000 series readout system}} | |||
[[Category:7000 series digitizer mainframes]] | |||
[[Category:Scan converter based instruments]] | |||
[[Category:GPIB interface]] | |||