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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=(?) |
|summary=500/750 MHz digitizer
discontinued=(?) |
|image=Tek-7912ad.jpg
summary=500/750 MHz Digitizer|
|caption=Tektronix 7912AD with [[7A26]] and [[7B90P]]  
manuals=
|introduced=1973
* [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Manual (PDF)]
|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. 


The '''Tektronix 7912''' is a high-speed digitizer that takes 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]].   There is a 7912AD which has 500 MHz bandwidth and a 7912HB which offers 750 MHz bandwidth.  
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.


These instruments contain a special internal CRT-based digitizing [[scan converter]] tube ([[T7912]])
==7912 Series Models==
that is not visible from the outside.  The signal goes from the vertical plug-in to the
* The '''[[R7912]]''', introduced in September 1973 (Ref.1), achieved a bandwidth of 500 MHz with a [[7A19]] vertical amplifier plug-in.
vertical amplifier to the digitizing tube where it deflects a beam of electrons.
* The '''[[7912AD]]''' (1978) had 500 MHz bandwidth and introduced a standard [[GPIB interface]].
The electrons hit a small flat rectangular target inside the tube.
* The '''[[7912HB]]''' (1987) extended bandwidth to 750 MHz (using a [[7A29P]] amplifier).
This target is a solid state image sensor, conceptually similar to that in a digital camera.


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
a form of scan converter.  Three output methods are provided: NTSC-out, X-Y low-speed analog,
and a [[GPIB interface]].
 
The resolution of the target is 512x512, giving 512 points in the time domain and 9-bit linear
quantization of the input voltage.  Bypassing the vertical amplifier, the 7912 can provide a
bandwidth of 1 GHz with a sensitivity of 4 V/Div. 
 
With aftermarket modifications to the electronics, 7912AD bandwidths have been extended above
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.
 
Plug-in modules intended 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>


==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


[[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 05:26, 14 December 2023

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

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