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|series=7000-series scopes | |series=7000-series scopes | ||
|model=7912AD | |model=7912AD | ||
|summary= | |summary=500 MHz digitizer | ||
|image=Tek-7912ad.jpg | |image=Tek-7912ad.jpg | ||
|caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] | |caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] | ||
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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= | ||
* [[Media:7912ad_theory.pdf | 7912AD Operator's Manual (partial, 57 pages from introduction)]] | * [[Media:7912ad_theory.pdf | 7912AD Operator's Manual (partial, 57 pages from introduction)]] | ||
* [https://w140.com/7912ad_reading_gun_supply.pdf 7912AD Video preamp/Reading gun supply schematics] | * [https://w140.com/7912ad_reading_gun_supply.pdf 7912AD Video preamp/Reading gun supply schematics] | ||
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* [[Media:47W-5355.pdf|Tektronix 7912AD Brochure]] | * [[Media:47W-5355.pdf|Tektronix 7912AD Brochure]] | ||
{{ROM Images}} | {{ROM Images}} | ||
* U900: [[Media:Tek160-1900-00 8445 U900.BIN|160-1900-00]] | * U900: [[Media:Tek160-1900-00 8445 U900.BIN|160-1900-00]] | ||
* U1000: [[Media:Tek160-1899-00_8445_U1000.BIN|160-1899-00]] | * U1000: [[Media:Tek160-1899-00_8445_U1000.BIN|160-1899-00]] | ||
* U1200: [[Media:Tek160-1901-00_8445_U1200.BIN|160-1901-00]] | * U1200: [[Media:Tek160-1901-00_8445_U1200.BIN|160-1901-00]] | ||
}} | }} | ||
The '''Tektronix 7912AD''' is a scan converter based digitizer in the [[7912|7912 series]] that succeeded the earlier [[R7912]] in 1978. | |||
''' | It has 500 MHz bandwidth, introduced a standard [[GPIB interface]] into the 7912 series, 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. | |||
For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P' (Programmable) suffix were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]]. | |||
The 7912AD was succeeded by the 750 MHz '''7912HB''' in 1987 (using a [[7A29P]] amplifier). | |||
{{MissingSpecs}} | |||
===Options=== | |||
* 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. | |||
* 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. | |||
==Internals== | |||
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. | |||
With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases. | |||
==Links== | |||
* [[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]] | |||
* [[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]] | |||
* [[Media:Jonathan scott MESCthesis.pdf|Thesis on "7912ADM" upgrade version, Jonathan B. Scott]] | |||
* [[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 | |||
* [https://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org] | |||
{{Documents|Link=7912AD}} | |||
==See Also== | |||
* [[R7912]], [[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> | |||
Tek-7912ad.jpg|7912AD front | |||
7912AD_Front.jpg |7912AD front | |||
7912ad.jpg|7912AD |7912AD front | |||
7912AD_Rear.jpg|7912AD rear | |||
Tek7912AD Top.JPG | 7912AD top view, cover removed | |||
7912AD_Top.jpg | 7912AD top view, cover removed | |||
7912AD_Top_detail.jpg| 7912AD top detail with A34 vertical amp | |||
7912AD_Right.jpg|7912AD right | |||
7912AD_Bottom.jpg|7912AD bottom, cover removed | |||
7912ad-block.png | 7912AD block diagram | |||
7912ad tube.gif | 7912AD digitizer tube | |||
TEK Tube7912 Pic5.jpg | T7912 tube - read part (left), target (center), write part (right). See [[T7912]] article for more photos. | |||
IMG 20130408 115501.jpg|7912AD TV output on NTSC monitor | |||
7912AD_FrontPanel.jpg|7912AD Back side of front panel | |||
7912AD_A10_rear.jpg|7912AD A10 rear | |||
7912AD_A10_front.jpg|7912AD A10 front with buttons partially removed to access the [[150-0048-01]] lamps | |||
7912AD_PowerSwitch.jpg |7912AD A12 power button PCB front | |||
7912AD_PowerSwitch_dis2.jpg |7912AD A12 power button disassembled to access the [[150-0048-01]] lamp | |||
7912AD_A12_PowerSwitchRear.jpg| 7912AD A12 power button PCB rear | |||
7912AD_A16.jpg | 7912AD A16 Memory Control with [[82S185]] PROMs | |||
Tek7912ad 5156 bot.jpg|7912AD A18 Data Memory | |||
Tek7912ad 5156 top.jpg|7912AD A18 Data Memory with [[IM5610]] PROMs | |||
Tek7912ad data buffer top.jpg|7912AD A20 data buffer | |||
Tek7912ad data buffer bot.jpg|7912AD A20 data buffer | |||
Tek7912ad translator top.jpg|7912AD A22 translator | |||
Tek7912ad translator bot.jpg|7912AD A22 translator | |||
Tek7912ad graticule gen top.jpg|7912AD A24 graticule generator | |||
Tek7912ad graticule gen bot.jpg|7912AD A24 graticule generator | |||
Tek7912ad x-y ramp gen top.jpg|7912AD A26 X-Y ramp generator | |||
Tek7912ad x-y ramp gen bot.jpg|7912AD A26 X-Y ramp generator | |||
Tek7912ad video proc top.jpg|7912AD A28 video processor | |||
Tek7912ad 4377.jpg|7912AD A32 Video preamp | |||
Tek7912ad horiz.jpg|7912AD A40 horizontal | |||
Tek7912ad scan amp.jpg|7912AD A38 scan amplifier | |||
Tek7912ad mpu top.jpg|7912AD A54 MPU (new version with [[Motorola 6802|6802]] CPU SN B111166up) | |||
Tek7912ad mpu bot.jpg|7912AD A54 MPU (new version with [[Motorola 6802|6802]] CPU SN B111166up) | |||
Tek7912ad ieee488 top.jpg|7912AD A56 IEEE 488 | |||
Tek7912ad ieee488 bot.jpg|7912AD A56 IEEE 488 | |||
Tek 7912AD-670-5157-00-power-connector-pcb 1.jpg|7912AD A62 power connector PCB | |||
Tek 7912AD-670-5157-00-power-connector-pcb 2.jpg|7912AD A62 power connector PCB | |||
Tek 670-6466-00 1.jpg | 670-6466-00 plug-in extender | |||
</gallery> | |||
==Components== | |||
{{Parts|7912AD}} | |||
[[Category:7000 series digitizer mainframes]] | [[Category:7000 series digitizer mainframes]] | ||
[[Category:Scan converter based instruments]] | |||
[[Category:GPIB interface]] |