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The Tektronix 7912 is a high-speed digitizer that takes one 7000-series vertical plug-in  
{{Oscilloscope Sidebar
and one 7000-series horizontal plug-in.  There is a 7912AD which has 500 MHz bandwidth
|manufacturer=Tektronix
and a 7912HB which offers 750 MHz bandwidth.  
|series=7000-series scopes
|model=7912
|summary=500/750 MHz digitizer
|image=Tek-7912ad.jpg
|caption=Tektronix 7912AD with [[7A26]] and [[7B90P]]
|introduced=1973
|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
|manuals=
* ''see individual model pages''
}}
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.


These instruments contain a special internal CRT-based digitizing [[scan converter]] tube  
All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]], 154-0698-00) that is not visible from the outside.  
that is not visible from the outside. The signal goes from the vertical plug-in to the  
The signal from the vertical plug-in deflects a writing beam through [[distributed deflection plates]].
vertical amplifier to the digitizing tube where it deflects a beam of electrons.
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.


The electrons hit a small flat rectangular target inside the tube.
==7912 Series Models==
This target is a solid state image sensor, conceptually similar to that in a digital camera.
* 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).


The trace is read from the target by electronics in the 7912AD, digitized, and stored in memory.
* The [[LM7912]] is a Tektronix R7912 modified by Lockheed Palo Alto Research Lab for extended bandwidth.


The reading of the target is asynchronous from the sweep and therefore the tube can be considered
==Project Staff==
a form of scan converter.  Three output methods are provided: NTSC-out, X-Y low-speed analog,  
* [[Carlo Infante]], Program manager
and a [[GPIB interface]]
* [[Jim Cavoretto]], Project Engineer
 
* [[Al Allworth]], [[Don Roberts]], and [[Stu McNaughton]], Electrical Engineers
The resolution of the target is 512x512, giving 512 points in the time domain and 9-bit linear
* [[Walt Lowy]], Engineering Technician
quantization of the input voltage.  Skipping the vertical amplifier, the 7912 can provide a
* [[Ray Hayes]], [[Ken Hawken]], [[Bob Culter]], [[Hal Cobb]], [[Ed Ritz]], and [[Bo Janko]], CRT Engineering
bandwidth of 1 GHz with a sensitivity of 4V/Div. 
* [[Loyal Strom]], [[Helene Albright]] and [[Ken Nesvold]], Prototype Support
 
* [[Doug Giesbers]], [[Larry Pearson]] and [[Phil Lloyd]], Mechanical Engineering
With aftermarket modifications to the electronics, 7912AD bandwidths have been extended above
* [[Nick Hughes]] and [[Ray Blohm]], Instrument Manufacturing
2 GHz in special cases.  With a 7B92 sweeping the whole X-axis in 5 ns, and the 7912AD capturing
512 samples in that sweep, the 7912AD performs the function of a 100 GSample/s ADC. 
 
The technology was designed at Tektronix in the 1970's and sold through the 1980's. They were expensive.
 
The WP 2000 (067-0679-00) Digital Display Controller is an external module that interfaces with the 7912.
 
Plugin modules for the 7912 have a 'P' suffix, meaning Programmable, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
 
==Specifications==
 
The Tektronix 7912AD is 19" wide, 7" tall, 27" deep, and weighs 55 pounds.  It uses 360 watts maximum.
 
==Manuals==
 
* http://w140.com/7912ad_theory.pdf
* http://w140.com/tek_7912_and_related_digitizer_docs.pdf
* http://w140.com/kurt/7912_gpib_examples.zip
* http://130.226.56.153/rispubl/reports_INIS/RISOM2873.pdf
* http://www.scottpages.net/MESCthesis.pdf
* http://w140.com/US3748585.pdf
* http://w140.com/7912ad_reading_gun_supply.pdf
* http://w140.com/7912ad_writing_gun_supply.pdf
* http://www.radiomuseum.org/forum/tektronix_r7912_transient_digitizer.html
* http://pwww.lle.rochester.edu/media/publications/lle_review/documents/v25/25_Review.pdf
* http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/10/434/10434659.pdf
* http://w140.com/boyer_data_acq_ebeam_fus_acc.pdf
 
==Pictures==
 
<gallery>
Image:7912ad tube.gif|7912AD digitizer tube
Image:R7912 1.jpg|R7912 front
Image:R7912 2.jpg|R7912 controls
Image:R7912 3.jpg|R7912 rear
Image:7912ad.jpg|7912AD front
Image:Tek wp2000 1.jpg|WP 2000
Image:Tek wp2000 2.jpg|WP 2000
Image:Tek wp2000 3.jpg|WP 2000
File:IMG 20130408 115501.jpg|7912AD TV output on NTSC monitor
File:Tek7912ad ieee488 top.jpg|7912AD IEEE 488
File:Tek7912ad ieee488 bot.jpg|7912AD IEEE 488
File:Tek7912ad mpu top.jpg|7912AD MPU
File:Tek7912ad mpu bot.jpg|7912AD MPU
File:Tek7912ad 5156 bot.jpg|7912AD 5156
File:Tek7912ad 5156 top.jpg|7912AD 5156
File:Tek7912ad data buffer top.jpg|7912AD data buffer
File:Tek7912ad data buffer bot.jpg|7912AD data buffer
File:Tek7912ad translator top.jpg|7912AD translator
File:Tek7912ad translator bot.jpg|7912AD translator
File:Tek7912ad graticule gen top.jpg|7912AD graticule generator
File:Tek7912ad graticule gen bot.jpg|7912AD graticule generator
File:Tek7912ad x-y ramp gen top.jpg|7912AD X-Y ramp generator
File:Tek7912ad x-y ramp gen bot.jpg|7912AD X-Y ramp generator
File:Tek7912ad video proc top.jpg|7912AD video processor
File:Tek7912ad 4377.jpg|7912AD 4377
File:Tek7912ad horiz.jpg|7912AD horizontal
File:Tek7912ad scan amp.jpg|7912AD scan amplifier
</gallery>


==Links==
{{PatentLinks|7912}}


[[Category:7000 series digitizer mainframes]]
[[Category:7000 series digitizer mainframes]]
[[Category:Specifications needed]]
[[Category:Scan converter based instruments]]
 
[[Category:GPIB interface]]

Latest revision as of 03:36, 8 June 2024

Tektronix 7912
500/750 MHz digitizer
Tektronix 7912AD with 7A26 and 7B90P

Produced from 1973 to 1989

Manuals
  • see individual model pages
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7912 is a series of high-speed digitizers that take one 7000-series vertical plug-in and one 7000-series horizontal plug-in. The primary markets for the 7912 series were nuclear and laser research.

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 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.

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).
  • The LM7912 is a Tektronix R7912 modified by Lockheed Palo Alto Research Lab for extended bandwidth.

Project Staff

Links

Patents that may apply to 7912

Page Title Inventors Filing date Grant date Links
Patent US 3748585A Silicon diode array scan converter storage tube and method of operation Robert G. Culter • Raymond Hayes • Emmanuel Sang 1971-11-15 1973-07-24 7912 • T7912 • R7912 • 7912AD • 7912HB • Scan converter
Patent US 3796910A Electron beam deflection system Ed Ritz 1972-08-04 1974-03-12 7912 • T7912 • R7912 • 7912AD • 7912HB
Patent US 3893036A Precision function generator Jim Cavoretto • Al Allworth • Carlo Infante 1973-07-27 1975-07-01 7912 • T7912 • R7912 • 7912AD • 7912HB
Patent US 3970889A Erasure means for charge storage device Hal Cobb 1973-11-21 1976-07-20 7912 • T7912 • Scan converter
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