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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=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:R7912 070-1590-00.pdf|Tektronix R7912 Service Manual (PDF)]]
* [[Media:070-1590-00.pdf|Tektronix R7912 Service Manual]]
* [[Media:1350 070-1888-00.pdf|1350 (AKA 067-0679-00) Memory Display Unit for R7912 (PDF)]]
* [[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 (PDF)]]
* [[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]
* [http://w140.com/tek_7912_and_related_digitizer_docs.pdf 7912 and related digitizer documents]
'''7912AD/HB'''
'''7912AD/HB'''
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* [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 (PDF)]]
* [[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''' 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]].   


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 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 electrons hit a small flat rectangular solid state target, conceptually similar to the image sensor in a digital camera.
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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==
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Waveforms are converted to digital, stored in memory, and can be read by a computer.
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,
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.
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.   
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 with the 7912 and an analog X-Y storage display ([[607]]?).
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]]. In contrast to the earlier R7912 the readout characters in video mode are now created digitally and directly injected into the video signal.
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).  
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' suffix, meaning Programmable,
For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P'  
were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
(Programmable) suffix were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].


===7912AD Options===
===7912AD Options===
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==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 recommends the [[634|634 monitor]] or a monitor from the 650- and 670-series and a 75 Ω termination. For X-Y-Z analog Tek recommends a 600-series monitor and no specific termination requirement.   
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.
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 uses 360 watts maximum.
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==
# [http://tekretirees.org/Newsletter/nov2012_trn.pdf Hale Farley, ''The introduction of the R7912''] in Tek Retirees Newsletter 11/2012
# [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
# [http://w140.com/US3748585.pdf US Patent 3748585: ''Silicon Diode Array Scan Converter Tube and Method of Operation''.  Culter et al, July 1973.]
# [[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
* [[067-0854-00]] 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|WP 2000 front next to [[608]] monitor
Tek wp2000 2.jpg|067-0679-00 front next to [[608]] monitor
Tek wp2000 3.jpg|WP 2000 rear next to [[608]] monitor
Tek wp2000 3.jpg|067-0679-00 rear next to [[608]] monitor
Tek wp2000 1.jpg|WP 2000 detail
Tek wp2000 1.jpg|067-0679-00 detail
067-0679-00.jpg |067-0679-00 aka [[1350]]
</gallery>
</gallery>


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7912AD_PowerSwitch_dis2.jpg |7912AD A12 power button disassembled to access the [[150-0048-01]] lamp
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_A12_PowerSwitchRear.jpg| 7912AD A12 power button PCB rear
7912AD_A16.jpg | 7912AD A16 Memory Control  
7912AD_A16.jpg | 7912AD A16 Memory Control with [[82S185]] PROMs
Tek7912ad 5156 bot.jpg|7912AD A18 Data Memory
Tek7912ad 5156 bot.jpg|7912AD A18 Data Memory
Tek7912ad 5156 top.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 top.jpg|7912AD A20 data buffer
Tek7912ad data buffer bot.jpg|7912AD A20 data buffer
Tek7912ad data buffer bot.jpg|7912AD A20 data buffer
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</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]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/56296...78990"

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