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| |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 | | |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= | | |manuals= |
| '''R7912'''
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| * [[Media:070-1590-00.pdf|Tektronix R7912 Service Manual]]
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| * [[Media:070-1888-00.pdf|1350 (aka 067-0679-00) Memory Display Unit for R7912]]
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| * [[Media:Waveform Digitizing Instruments (R7912).pdf|Waveform Digitizing Instruments (R7912) Brochure]]
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| * [[Media:tek_7912_and_related_digitizer_docs.pdf|7912 and related digitizer documents]]
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| '''7912AD/HB'''
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| * [[Media:7912ad_theory.pdf | 7912AD Operator's Manual (partial, 57 pages from introduction)]]
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| * [[Media:7912ad reading gun supply.pdf|7912AD Video preamp/Reading gun supply schematics]]
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| * [[Media:7912ad writing gun supply.pdf|7912AD Z-Axis/HV board schematics]]
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| * [[Media:070-5077-00.pdf|Tektronix 7912AD Instrument Interfacing Guide]]
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| * [[Media:47W-5355.pdf|Tektronix 7912AD Brochure]]
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| {{ROM Images}}
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| '''7912'''<br>
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| ''missing, please add''<br>
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| '''7912AD'''
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| * U900: [[Media:Tek160-1900-00 8445 U900.BIN|160-1900-00]]
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| * U1000: [[Media:Tek160-1899-00_8445_U1000.BIN|160-1899-00]]
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| * U1200: [[Media:Tek160-1901-00_8445_U1200.BIN|160-1901-00]]
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| '''7912HB'''<br>
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| ''missing, please add''
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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]] | | 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]]. | | 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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| All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]], 154-0698-00) that is not visible from the outside. | | All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]], 154-0698-00) that is not visible from the outside. |
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| The electrons hit a small flat rectangular solid state target, conceptually similar to the image sensor in a digital camera. | | The electrons hit a small flat rectangular solid state target, conceptually similar to the image sensor 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. |
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| 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.
| | ==7912 Series Models== |
| | * 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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| The primary markets for the 7912 series were nuclear and laser research. | | * The [[LM7912]] is a Tektronix R7912 modified by Lockheed Palo Alto Research Lab for extended bandwidth. |
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| 7912 project staff:
| | ==Project Staff== |
| * [[Carlo Infante]], Program manager | | * [[Carlo Infante]], Program manager |
| * [[Jim Cavoretto]], Project Engineer | | * [[Jim Cavoretto]], Project Engineer |
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| * [[Doug Giesbers]], [[Larry Pearson]] and [[Phil Lloyd]], Mechanical Engineering | | * [[Doug Giesbers]], [[Larry Pearson]] and [[Phil Lloyd]], Mechanical Engineering |
| * [[Nick Hughes]] and [[Ray Blohm]], Instrument Manufacturing | | * [[Nick Hughes]] and [[Ray Blohm]], Instrument Manufacturing |
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| ==R7912==
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| The '''R7912''', introduced in September 1973 (Ref.1), achieved a bandwidth of 500 MHz with a [[7A19]] vertical amplifier plug-in.
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| 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,
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| albeit at reduced sensitivity (4 V/Div) and loss of triggering and readout functions.
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| Some customers further modified the stock 7912 to increase bandwidth up to 3 GHz in special applications (see literature links below).
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| The reading beam operates differently depending on the output mode.
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| 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,
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| in 512 discrete steps for each of 512 horizontal positions.
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| Waveforms are converted to digital, stored in memory, and can be read by a computer.
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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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| The R7912 had a proprietary digital interface. A card for interfacing to a DEC PDP-11 was available.
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| The Tektronix 067-0679-00 aka [[1350]] "Digital Display Controller" or "Memory Display Unit" is an external module that interfaces the R7912 to X-Y monitors.
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| Tek also offered configurations with multiple R7912s on a common controller within the WP2000 series.
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|
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| ==7912AD and 7912HB==
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| From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]] and could drive X-Y monitors directly. In contrast to the earlier R7912, the readout characters in video mode were created digitally and directly injected into the video signal.
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| The 7912AD has 500 MHz bandwidth. It was succeeded by the 750 MHz '''7912HB''' in 1987 (using a [[7A29P]] amplifier).
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| For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P'
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| (Programmable) suffix were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
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|
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| ===7912AD Options===
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| * Option 4: Change to fast digitize mode. This option trades off scan time with resolution by compressing the scan. The target is written on and read from a 256 x 256 point matrix with a maximum of 14 points stored per vertical scan. This option is achieved by setting the correct jumpers on the A16, A20, A22, A26, A46 boards.
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| * Option 13: Changes the video output to 625 lines/frame with a 50 Hz field rate (PAL). This option is achieved by setting the correct jumpers on the A20 and A28 boards.
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| ==Internals==
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| Three output methods are provided: Video (NTSC or PAL), X-Y-Z low-speed analog, and a [[GPIB interface]]. For video-out, Tektronix recommended the [[634|634 monitor]] or a monitor from the 650- and 670-series and a 75 Ω termination. For X-Y-Z analog, Tek recommended a 600-series monitor and no specific termination requirement.
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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 consumes 360 watts maximum.
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| ==Literature and Software==
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| # [[Media:Tek retiree news 2012 11 nov.pdf|Hale Farley, ''The introduction of the R7912'']] in Tek Retirees Newsletter 11/2012
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| # [[Patent US 3748585A|US Patent 3748585: ''Silicon Diode Array Scan Converter Tube and Method of Operation''. Culter et al, July 1973.]]
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| # [[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)"''
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| # [[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
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| # [[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]]
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| # [[Media:SAND94-0784.pdf|William B. Boyer, ''Overview of the Instrument Control and Data Reduction Software in the Sandia Data Acquistion System at the Nevada Test Site]]
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| # [[Media:Jonathan scott MESCthesis.pdf|Thesis on "7912ADM" upgrade version, Jonathan B. Scott]]
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| # [[Media:RISOM2873.pdf|''Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET''. Risø National Laboratory, Denmark, June 1990]] discussing how removing the delay line and replacing the compensation circuit can boost the 7912AD+7A29 combination to 1.1 GHz bandwidth
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| ==Links==
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| * [http://www.radiomuseum.org/forum/tektronix_r7912_transient_digitizer.html Tek R7912 @ radiomuseum.org]
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| * [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org]
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| {{Documents|Link=R7912}}
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| {{Documents|Link=7912AD}}
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| {{Documents|Link=7912HB}}
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|
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| ==See Also==
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| * [[WP2051]], [[WP2052]]
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| * [[MP1101]]
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| * [[SCD1000]], [[SCD5000]]
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| * [[670-6466-00]] 7912 AD plug-in interface extender
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| * [[067-0854-00]] Calibration Kit
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| * [[067-0679-99]] R7912 Demo Unit
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|
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| ==Pictures==
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|
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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. Note 7000-style readout.
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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
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| Tek wp2000 2.jpg|067-0679-00 front next to [[608]] monitor
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| Tek wp2000 3.jpg|067-0679-00 rear next to [[608]] monitor
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| Tek wp2000 1.jpg|067-0679-00 detail
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| 067-0679-00.jpg |067-0679-00 aka [[1350]]
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| </gallery>
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|
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| ===7912AD===
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| <gallery>
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| Tek-7912ad.jpg|7912AD front
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| 7912AD_Front.jpg |7912AD front
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| 7912ad.jpg|7912AD |7912AD front
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| 7912AD_Rear.jpg|7912AD rear
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| Tek7912AD Top.JPG | 7912AD top view, cover removed
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| 7912AD_Top.jpg | 7912AD top view, cover removed
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| 7912AD_Top_detail.jpg| 7912AD top detail with A34 vertical amp
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| 7912AD_Right.jpg|7912AD right
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| 7912AD_Bottom.jpg|7912AD bottom, cover removed
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| 7912ad-block.png | 7912AD block diagram
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| 7912ad tube.gif | 7912AD digitizer tube
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| TEK Tube7912 Pic5.jpg | T7912 tube - read part (left), target (center), write part (right). See [[T7912]] article for more photos.
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| IMG 20130408 115501.jpg|7912AD TV output on NTSC monitor
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| 7912AD_FrontPanel.jpg|7912AD Back side of front panel
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| 7912AD_A10_rear.jpg|7912AD A10 rear
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| 7912AD_A10_front.jpg|7912AD A10 front with buttons partially removed to access the [[150-0048-01]] lamps
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| 7912AD_PowerSwitch.jpg |7912AD A12 power button PCB front
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| 7912AD_PowerSwitch_dis2.jpg |7912AD A12 power button disassembled to access the [[150-0048-01]] lamp
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| 7912AD_A12_PowerSwitchRear.jpg| 7912AD A12 power button PCB rear
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| 7912AD_A16.jpg | 7912AD A16 Memory Control with [[82S185]] PROMs
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| Tek7912ad 5156 bot.jpg|7912AD A18 Data Memory
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| Tek7912ad 5156 top.jpg|7912AD A18 Data Memory with [[IM5610]] PROMs
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| Tek7912ad data buffer top.jpg|7912AD A20 data buffer
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| Tek7912ad data buffer bot.jpg|7912AD A20 data buffer
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| Tek7912ad translator top.jpg|7912AD A22 translator
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| Tek7912ad translator bot.jpg|7912AD A22 translator
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| Tek7912ad graticule gen top.jpg|7912AD A24 graticule generator
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| Tek7912ad graticule gen bot.jpg|7912AD A24 graticule generator
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| Tek7912ad x-y ramp gen top.jpg|7912AD A26 X-Y ramp generator
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| Tek7912ad x-y ramp gen bot.jpg|7912AD A26 X-Y ramp generator
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| Tek7912ad video proc top.jpg|7912AD A28 video processor
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| Tek7912ad 4377.jpg|7912AD A32 Video preamp
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| Tek7912ad horiz.jpg|7912AD A40 horizontal
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| Tek7912ad scan amp.jpg|7912AD A38 scan amplifier
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| Tek7912ad mpu top.jpg|7912AD A54 MPU (new version with [[Motorola 6802|6802]] CPU SN B111166up)
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| Tek7912ad mpu bot.jpg|7912AD A54 MPU (new version with [[Motorola 6802|6802]] CPU SN B111166up)
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| Tek7912ad ieee488 top.jpg|7912AD A56 IEEE 488
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| Tek7912ad ieee488 bot.jpg|7912AD A56 IEEE 488
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| Tek 7912AD-670-5157-00-power-connector-pcb 1.jpg|7912AD A62 power connector PCB
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| Tek 7912AD-670-5157-00-power-connector-pcb 2.jpg|7912AD A62 power connector PCB
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| Tek 670-6466-00 1.jpg | 670-6466-00 plug-in extender
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| </gallery>
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| ===7912HB===
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| <gallery>
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| Tek 7912hb 1.jpg|7912HB
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| Tek 7912hb 2.jpg|7912HB
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| Tek 7912hb 3.jpg|7912HB
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| Tek 7912hb 4.jpg|7912HB
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| </gallery>
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|
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| ==Components==
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| {{Parts|R7912}}
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|
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| {{Parts|7912AD}}
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| {{Parts|7912HB}}
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| {{Custom ICs|7000 series readout system}}
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| [[Category:7000 series digitizer mainframes]] | | [[Category:7000 series digitizer mainframes]] |
| [[Category:Scan converter based instruments]] | | [[Category:Scan converter based instruments]] |
| [[Category:Specifications needed]]
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| [[Category:GPIB interface]]
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