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{{Oscilloscope Sidebar| | {{Oscilloscope Sidebar | ||
|manufacturer=Tektronix | |||
image=Tek-7912ad.jpg| | |series=7000-series scopes | ||
caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] | | |model=7912 | ||
introduced=1973 | | |image=Tek-7912ad.jpg | ||
discontinued=1989 | | |caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] | ||
summary=500/750 MHz Digitizer| | |introduced=1973 | ||
manuals= | |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 | |||
|summary=500/750 MHz Digitizer | |||
|manuals= | |||
'''R7912''' | '''R7912''' | ||
... | * [[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]] | |||
* [http://w140.com/tek_7912_and_related_digitizer_docs.pdf 7912 and related digitizer documents] | |||
'''7912AD/HB''' | '''7912AD/HB''' | ||
* [[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)]] | ||
* [http://w140.com/7912ad_reading_gun_supply.pdf 7912AD Video preamp/Reading gun supply schematics] | * [http://w140.com/7912ad_reading_gun_supply.pdf 7912AD Video preamp/Reading gun supply schematics] | ||
* [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD Z-Axis/HV board schematics] | * [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD Z-Axis/HV board schematics] | ||
* '' | * [[Media:070-5077-00.pdf|Tektronix 7912AD Instrument Interfacing Guide]] | ||
* [[Media:47W-5355.pdf|Tektronix 7912AD Brochure]] | |||
{{ROM Images}} | |||
'''7912'''<br> | |||
''missing, please add''<br> | |||
'''7912AD''' | |||
* U900: [[Media:Tek160-1900-00 8445 U900.BIN|160-1900-00]] | |||
* U1000: [[Media:Tek160-1899-00_8445_U1000.BIN|160-1899-00]] | |||
* U1200: [[Media:Tek160-1901-00_8445_U1200.BIN|160-1901-00]] | |||
'''7912HD'''<br> | |||
''missing, please add'' | |||
}} | }} | ||
The '''Tektronix 7912''' | 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]]. | |||
All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]]) 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. | ||
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 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 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. | |||
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 7912 capturing 512 samples in that sweep, | ||
the 7912 performs the function of a 100 GSample/s A/D converter. | |||
The primary markets for the 7912 series were nuclear and laser research. | The primary markets for the 7912 series were nuclear and laser research. | ||
7912 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 | |||
==R7912== | ==R7912== | ||
The '''R7912''', introduced in September 1973 (Ref.1), achieved a bandwidth of 500 MHz with a [[7A19]] vertical amplifier plug-in. | The '''R7912''', introduced in September 1973 (Ref.1), 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 reading beam operates differently depending on the output mode. | 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 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. | The R7912 had a proprietary digital interface. A card for interfacing to a DEC PDP-11 was available. | ||
The Tektronix 067-0679-00 Digital Display Controller is an external module that interfaces | 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. | |||
Tek also offered configurations with multiple R7912s on a common controller within the WP2000 series. | Tek also offered configurations with multiple R7912s on a common controller within the WP2000 series. | ||
==7912AD and 7912HB== | ==7912AD and 7912HB== | ||
From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]]. | 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. | ||
The 7912AD has 500 MHz bandwidth. It was succeeded by the 750 MHz '''7912HB''' in 1987 (using a [[7A29P]] amplifier). | |||
For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P' | |||
(Programmable) suffix were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]]. | |||
===7912AD 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== | ==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. | |||
Three output methods are provided: NTSC | |||
With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases. | With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases. | ||
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==Specifications== | ==Specifications== | ||
The Tektronix 7912AD is 19" wide, 7" tall, 27" deep, and weighs 55 pounds. It | The Tektronix 7912AD is 19" wide, 7" tall, 27" deep, and weighs 55 pounds. It consumes 360 watts maximum. | ||
==Literature and Software== | ==Literature and Software== | ||
# [ | # [https://tek-retirees.com/wp-content/uploads/simple-file-list/Newsletters/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.]] | ||
# [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)"'' | # [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)"'' | ||
# [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 | # [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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* [[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]] | * [[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]] | ||
* [http://www.radiomuseum.org/forum/tektronix_r7912_transient_digitizer.html Tek R7912 @ radiomuseum.org] | * [http://www.radiomuseum.org/forum/tektronix_r7912_transient_digitizer.html Tek R7912 @ radiomuseum.org] | ||
* [[Dale Aufrecht]]: An Intelligent, Programmable Transient Digitizer (7912AD). In [[Media:Tekscope 1979 V11 N1.pdf | TekScope Vol. 11 No. 1, 1979]] | * [[Dale Aufrecht]]: An Intelligent, Programmable Transient Digitizer (7912AD). In [[Media:Tekscope 1979 V11 N1.pdf | TekScope Vol. 11 No. 1, 1979]] | ||
* [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org] | * [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org] | ||
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==See Also== | ==See Also== | ||
* [[WP2051]], [[WP2052]] | * [[WP2051]], [[WP2052]] | ||
* [[MP1101]] | |||
* [[SCD1000]], [[SCD5000]] | * [[SCD1000]], [[SCD5000]] | ||
* [[670-6466-00]] 7912 AD plug-in interface extender | * [[670-6466-00]] 7912 AD plug-in interface extender | ||
* [[067-0854-00]] Calibration Kit | |||
* [[067-0679-99]] R7912 Demo Unit | |||
==Pictures== | ==Pictures== | ||
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R7912 2.jpg | R7912 controls | R7912 2.jpg | R7912 controls | ||
R7912 3.jpg | R7912 rear | 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> | </gallery> | ||
===7912AD=== | ===7912AD=== | ||
<gallery> | <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 | 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. | 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 | 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 | |||
Tek7912ad 5156 bot.jpg|7912AD | 7912AD_A12_PowerSwitchRear.jpg| 7912AD A12 power button PCB rear | ||
Tek7912ad 5156 top.jpg|7912AD | 7912AD_A16.jpg | 7912AD A16 Memory Control with [[82S185]] PROMs | ||
Tek7912ad data buffer top.jpg|7912AD data buffer | Tek7912ad 5156 bot.jpg|7912AD A18 Data Memory | ||
Tek7912ad data buffer bot.jpg|7912AD data buffer | Tek7912ad 5156 top.jpg|7912AD A18 Data Memory with [[IM5610]] PROMs | ||
Tek7912ad translator top.jpg|7912AD translator | Tek7912ad data buffer top.jpg|7912AD A20 data buffer | ||
Tek7912ad translator bot.jpg|7912AD translator | Tek7912ad data buffer bot.jpg|7912AD A20 data buffer | ||
Tek7912ad graticule gen top.jpg|7912AD graticule generator | Tek7912ad translator top.jpg|7912AD A22 translator | ||
Tek7912ad graticule gen bot.jpg|7912AD graticule generator | Tek7912ad translator bot.jpg|7912AD A22 translator | ||
Tek7912ad x-y ramp gen top.jpg|7912AD X-Y ramp generator | Tek7912ad graticule gen top.jpg|7912AD A24 graticule generator | ||
Tek7912ad x-y ramp gen bot.jpg|7912AD X-Y ramp generator | Tek7912ad graticule gen bot.jpg|7912AD A24 graticule generator | ||
Tek7912ad video proc top.jpg|7912AD video processor | Tek7912ad x-y ramp gen top.jpg|7912AD A26 X-Y ramp generator | ||
Tek7912ad 4377.jpg|7912AD | Tek7912ad x-y ramp gen bot.jpg|7912AD A26 X-Y ramp generator | ||
Tek7912ad horiz.jpg|7912AD horizontal | Tek7912ad video proc top.jpg|7912AD A28 video processor | ||
Tek7912ad scan amp.jpg|7912AD scan amplifier | 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> | |||
===7912HB=== | |||
<gallery> | |||
Tek 7912hb 1.jpg|7912HB | |||
Tek 7912hb 2.jpg|7912HB | |||
Tek 7912hb 3.jpg|7912HB | |||
Tek 7912hb 4.jpg|7912HB | |||
</gallery> | </gallery> | ||
{{Custom ICs|R7912}} | |||
{{Custom ICs|7000 series readout system}} | |||
{{CRTs|R7912}} | |||
{{Custom ICs|7912AD}} | |||
{{CRTs|7912AD}} | |||
{{Custom ICs|7912HB}} | |||
{{CRTs|7912HB}} | |||
[[Category:7000 series digitizer mainframes]] | [[Category:7000 series digitizer mainframes]] |