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| {{Oscilloscope Sidebar| | | {{Oscilloscope Sidebar |
| title=Tektronix 7912|
| | |manufacturer=Tektronix |
| image=Tek-7912ad.jpg| | | |series=7000-series scopes |
| caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] | | | |model=7912 |
| introduced=1974 | | | |summary=500/750 MHz digitizer |
| discontinued=1989 | | | |image=Tek-7912ad.jpg |
| summary=500/750 MHz Digitizer|
| | |caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] |
| manuals= | | |introduced=1973 |
| '''R7912''' | | |discontinued=1989 |
| ...
| | |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 |
| '''7912AD/HB'''
| | |manuals= |
| * [[Media:7912ad_theory.pdf | 7912AD Operator's Manual (partial, 57 pages from introduction)]]
| | * ''see individual model pages'' |
| * [http://w140.com/tek_7912_and_related_digitizer_docs.pdf 7912 and related digitizer documents]
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| * [http://w140.com/7912ad_reading_gun_supply.pdf 7912AD Reading Gun Supply]
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| * [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD Writing Gun Supply]
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| }} | | }} |
| | The '''Tektronix 7912''' is a series of high-speed digitizers that take one [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-in]] |
| | and one [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-in]]. The primary markets for the 7912 series were nuclear and laser research. |
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| The '''Tektronix 7912''' was a series of high-speed digitizers that take one [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-in]] and one [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-in]].
| | All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]], 154-0698-00) that is not visible from the outside. |
| | | The signal from the vertical plug-in deflects a writing beam through [[distributed deflection plates]]. |
| All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]]) that is not visible from the outside. | | The electrons hit a small flat rectangular solid state target, conceptually similar to the image sensor in a digital camera. |
| The signal from the vertical plug-in deflects a writing beam through [[distributed deflection plates]]. The electrons hit a small flat rectangular solid state target, conceptually similar to that in a digital camera. The resolution of the target is 512×512, giving 512 points in the time domain and 9-bit linear quantization of the input voltage. | | The resolution of the target is 512×512, giving 512 points in the time domain and 9-bit linear quantization of the input voltage. |
| | | With a [[7B92]] sweeping the whole X-axis in 5 ns, and the 7912 capturing 512 samples in that sweep, the 7912 performs the function of a 100 GSample/s A/D converter. |
| With a 7B92 sweeping the whole X-axis in 5 ns, and the 7912AD capturing 512 samples in that sweep, the 7912 performs the function of a 100 GSample/s ADC. | |
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| ==R7912==
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| The '''R7912''', introduced in 1974, had a proprietary digital interface. A card for interfacing to a DEC PDP-11 was available.
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| The Tektronix WP2000 (067-0679-00) Digital Display Controller is an external module that interfaces with the 7912.
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| Tek also offered configurations with multiple R7912s on a common controller within the WP2000 series.
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| 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.
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| ==7912AD and 7912HB==
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| From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]]. The 7912AD has 500 MHz bandwidth. It was succeeded by the 750 MHz 7912HB in 1987.
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| For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P' suffix, meaning Programmable, were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
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| ==Internals==
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| The signal goes from the vertical plug-in to the vertical amplifier to the digitizing tube where it deflects a beam of electrons.
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| The trace is read from the target by electronics in the 7912AD, digitized, and stored in memory.
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| The reading of the target is asynchronous to the sweep and therefore the tube can be considered a form of scan converter.
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| Three output methods are provided: NTSC-out, X-Y low-speed analog, and a [[GPIB interface]].
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| Bypassing the vertical amplifier, the 7912 can provide a bandwidth of 1 GHz with a sensitivity of 4 V/Div.
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| With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases.
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| ==Specifications==
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| The Tektronix 7912AD is 19" wide, 7" tall, 27" deep, and weighs 55 pounds. It uses 360 watts maximum.
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| ==Literature and Software==
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| * [http://tekretirees.org/Newsletter/nov2012_trn.pdf The introduction of the R7912] by Hale Farley in the Tek Retirees Newsletter 11/2012
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| * [http://www.scottpages.net/MESCthesis.pdf Thesis on "7912ADM" upgrade version]
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| * [http://w140.com/US3748585.pdf US Patent 3748585: Silicon Diode Array Scan Converter Tube and Method of Operation. Culter et al, July 1973.]
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| * [http://pwww.lle.rochester.edu/media/publications/lle_review/documents/v25/25_Review.pdf 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)"''
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| * [http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/10/434/10434659.pdf Lockheed Palo Alto Research Lab study for LLL (June 1978)] describing the LM7912 Enhanced Performance Transient Digitizer, claiming 3 GHz bandwidth
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| * [http://w140.com/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]
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| * [http://w140.com/kurt/7912_gpib_examples.zip 7912 GPIB examples]
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| <!-- * http://130.226.56.153/rispubl/reports_INIS/RISOM2873.pdf no longer available? -->
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| ==Links==
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| * [[Carlo Infante]]: A New Way to Look At Transients (R7912). In [[Media:Tekscope 1973 V5 N6 Nov 1973.pdf | TekScope Vol. 5 No. 6, Nov-Dec 1973]]
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| * [http://www.radiomuseum.org/forum/tektronix_r7912_transient_digitizer.html Tek R7912 @ radiomuseum.org]
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| * [[Dale Aufrecht]]: An Intelligent, Programmable Transient Digitizer (7912AD). In [[Media:Tekscope 1979 V11 N1.pdf | TekScope Vol. 11 No. 1, 1979]] | | ==7912 Series Models== |
| * [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org] | | * The '''[[R7912]]''', introduced in September 1973 (Ref.1), achieved a bandwidth of 500 MHz with a [[7A19]] vertical amplifier plug-in. |
| | * The '''[[7912AD]]''' (1978) had 500 MHz bandwidth and introduced a standard [[GPIB interface]]. |
| | * The '''[[7912HB]]''' (1987) extended bandwidth to 750 MHz (using a [[7A29P]] amplifier). |
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| ==See Also==
| | * The [[LM7912]] is a Tektronix R7912 modified by Lockheed Palo Alto Research Lab for extended bandwidth. |
| * [[WP2051]], [[WP2052]] | |
| * [[SCD1000]], [[SCD5000]]
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| ==Pictures==
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| ===R7912===
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| <gallery>
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| USA Tek R7912 FrontWork.jpg | R7912 connected to a modern video monitor
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| R7912 1.jpg | R7912 front
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| R7912 2.jpg | R7912 controls
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| R7912 3.jpg | R7912 rear | |
| </gallery>
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| ===7912AD===
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| <gallery>
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| 7912ad tube.gif | 7912AD digitizer tube
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| 7912ad-block.png | 7912AD block diagram
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| 7912ad.jpg|7912AD front
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| Tek wp2000 1.jpg|WP 2000
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| Tek wp2000 2.jpg|WP 2000
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| Tek wp2000 3.jpg|WP 2000
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| IMG 20130408 115501.jpg|7912AD TV output on NTSC monitor
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| Tek7912ad ieee488 top.jpg|7912AD IEEE 488
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| Tek7912ad ieee488 bot.jpg|7912AD IEEE 488
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| Tek7912ad mpu top.jpg|7912AD MPU
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| Tek7912ad mpu bot.jpg|7912AD MPU
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| Tek7912ad 5156 bot.jpg|7912AD 5156
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| Tek7912ad 5156 top.jpg|7912AD 5156
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| Tek7912ad data buffer top.jpg|7912AD data buffer
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| Tek7912ad data buffer bot.jpg|7912AD data buffer
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| Tek7912ad translator top.jpg|7912AD translator
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| Tek7912ad translator bot.jpg|7912AD translator
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| Tek7912ad graticule gen top.jpg|7912AD graticule generator
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| Tek7912ad graticule gen bot.jpg|7912AD graticule generator
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| Tek7912ad x-y ramp gen top.jpg|7912AD X-Y ramp generator
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| Tek7912ad x-y ramp gen bot.jpg|7912AD X-Y ramp generator
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| Tek7912ad video proc top.jpg|7912AD video processor
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| Tek7912ad 4377.jpg|7912AD 4377
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| Tek7912ad horiz.jpg|7912AD horizontal
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| Tek7912ad scan amp.jpg|7912AD scan amplifier
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| </gallery>
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| | ==Project Staff== |
| | * [[Carlo Infante]], Program manager |
| | * [[Jim Cavoretto]], Project Engineer |
| | * [[Al Allworth]], [[Don Roberts]], and [[Stu McNaughton]], Electrical Engineers |
| | * [[Walt Lowy]], Engineering Technician |
| | * [[Ray Hayes]], [[Ken Hawken]], [[Bob Culter]], [[Hal Cobb]], [[Ed Ritz]], and [[Bo Janko]], CRT Engineering |
| | * [[Loyal Strom]], [[Helene Albright]] and [[Ken Nesvold]], Prototype Support |
| | * [[Doug Giesbers]], [[Larry Pearson]] and [[Phil Lloyd]], Mechanical Engineering |
| | * [[Nick Hughes]] and [[Ray Blohm]], Instrument Manufacturing |
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| [[Category:7000 series digitizer mainframes]] | | [[Category:7000 series digitizer mainframes]] |
| [[Category:Specifications needed]] | | [[Category:Scan converter based instruments]] |
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| [[Category:GPIB interface]]
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