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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 500MHz bandwidth
|manufacturer=Tektronix  
and a 7912HB which is 750MHz bandwidth. These instruments contain a special internal
|series=7000-series scopes
CRT-based digitizing [[scan converter]] tube
|model=7912
that is not visible from the outside.  The signal goes from
|summary=500/750 MHz digitizer
the vertical plug-in to the vertical amplifier to the digitizing tube where it deflects
|image=Tek-7912ad.jpg
a beam of electrons.  The electrons hit a small flat rectangular target inside the tube. 
|caption=Tektronix 7912AD with [[7A26]] and [[7B90P]]  
This target is a solid state image sensor, conceptually similar to that in a digital camera. 
|introduced=1973
The trace is read from the target by electronics in the 7912AD, digitized, and stored in memory. 
|discontinued=1989
The reading of the target is asynchronous from the sweep and therefore the tube can be considered
|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
a form of scan converter.  Three output methods are provided: NTSC-out, X-Y low-speed analog, and GPIB. 
|manuals=
The resolution of the target is 512x512, giving 512 points in the time domain and 9-bit linear
* ''see individual model pages''
quantization of the input voltage.  Skipping the vertical amplifier, the 7912 can provide a
}}
bandwidth of 1GHz with a sensitivity of 4V/division. 
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]]
With aftermarket modifications to the electronics, 7912AD
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.
bandwidths have been extended above 2GHz in special cases.  With a 7B92 sweeping the whole X-axis
in 5ns, and the 7912AD capturing 512 samples in that sweep, the 7912AD performs the function of a
100Gsamp/sec 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.  
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.


The Tektronix 7912AD is 19" wide, 7" tall, 27" deep, and weighs 55 pounds. It uese 360 watts maximum.
==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).


* http://w140.com/7912ad_theory.pdf
* The [[LM7912]] is a Tektronix R7912 modified by Lockheed Palo Alto Research Lab for extended bandwidth.
* 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


<gallery>
==Project Staff==
Image:7912ad tube.gif|7912AD digitizer tube
* [[Carlo Infante]], Program manager
Image:R7912 1.jpg|R7912 front
* [[Jim Cavoretto]], Project Engineer
Image:R7912 2.jpg|R7912 controls
* [[Al Allworth]], [[Don Roberts]], and [[Stu McNaughton]], Electrical Engineers
Image:R7912 3.jpg|R7912 rear
* [[Walt Lowy]], Engineering Technician
Image:7912ad.jpg|7912AD front
* [[Ray Hayes]], [[Ken Hawken]], [[Bob Culter]], [[Hal Cobb]], [[Ed Ritz]], and [[Bo Janko]], CRT Engineering
Image:Tek wp2000 1.jpg|WP 2000
* [[Loyal Strom]], [[Helene Albright]] and [[Ken Nesvold]], Prototype Support
Image:Tek wp2000 2.jpg|WP 2000
* [[Doug Giesbers]], [[Larry Pearson]] and [[Phil Lloyd]], Mechanical Engineering
Image:Tek wp2000 3.jpg|WP 2000
* [[Nick Hughes]] and [[Ray Blohm]], Instrument Manufacturing
</gallery>
 
==Links==
{{PatentLinks|7912}}
 
[[Category:7000 series digitizer mainframes]]
[[Category:Scan converter based instruments]]

Latest revision as of 04:36, 8 June 2024

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.

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)

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 Referencing 7912

Page Title Inventors Filing date Grant date Links
Patent US 3796910A Electron beam deflection system Ed Ritz 1972-08-04 1974-03-12 7912 • T7912
Patent US 3970889A Erasure means for charge storage device Hal Cobb 1973-11-21 1976-07-20 7912 • T7912
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