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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=1974 |
|summary=500/750 MHz digitizer
discontinued=1989 |
|image=Tek-7912ad.jpg
summary=500/750 MHz Digitizer|
|caption=Tektronix 7912AD with [[7A26]] and [[7B90P]]  
manuals=
|introduced=1973
* [http://w140.com/7912ad_theory.pdf 7912AD Theory]
|discontinued=1989  
* [http://w140.com/tek_7912_and_related_digitizer_docs.pdf 7912 and related digitizer documents]
|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
* [http://w140.com/7912ad_reading_gun_supply.pdf 7912AD Reading Gun Supply]
|manuals=
* [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD Writing Gun Supply]
* ''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''' was 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]], 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]].  
All 7912 models use the same internal CRT-based, digitizing [[scan converter]] tube ([[T7912]]) that is not visible from the outside.  
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 that 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.
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 7912AD capturing 512 samples in that sweep, the 7912 performs the function of a 100 GSample/s ADC. 
 
==R7912==
The '''R7912''', introduced in 1974, had a proprietary digital interface.  A card for interfacing to a DEC PDP-11 was available. 
The Tektronix WP2000 (067-0679-00) Digital Display Controller is an external module that interfaces with the 7912.
Tek also offered configurations with multiple R7912s on a common controller within the WP2000 series.
 
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.
 
==7912AD and 7912HB==
From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]].  The 7912AD has 500 MHz bandwidth.  It was succeeded by the 750 MHz 7912HB in 1987. 
 
For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P' suffix, meaning Programmable, were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
 
==Internals==
The signal goes from the vertical plug-in to the vertical amplifier to the digitizing tube where it deflects a beam of electrons. 
 
The trace is read from the target by electronics in the 7912AD, digitized, and stored in memory. 
The reading of the target is asynchronous to 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]].
 
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 up to 3 GHz in special cases.
 
==Specifications==
 
The Tektronix 7912AD is 19" wide, 7" tall, 27" deep, and weighs 55 pounds.  It uses 360 watts maximum.
 
==Literature and Software==
 
* [http://w140.com/kurt/7912_gpib_examples.zip 7912 GPIB examples]
* [http://www.scottpages.net/MESCthesis.pdf Thesis on "7912ADM" upgrade version]
* [http://w140.com/US3748585.pdf 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 -3dB 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
* http://w140.com/boyer_data_acq_ebeam_fus_acc.pdf William B. Boyer, DATA ACQUISITION AND PROCESSING ON ELECTRON BEAM FUSION ACCELERATORS. IEEE Transactions on Nuclear Science Vol.NS-25, No. 1, February 1978]
<!-- * http://130.226.56.153/rispubl/reports_INIS/RISOM2873.pdf no longer available? -->
 
==Links==
* [[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]


* [[Dale Aufrecht]]: An Intelligent, Programmable Transient Digitizer (7912AD).  In [[Media:Tekscope 1979 V11 N1.pdf | TekScope Vol. 11 No. 1, 1979]]
==7912 Series Models==
* [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org]
* 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).


==See Also==
* The [[LM7912]] is a Tektronix R7912 modified by Lockheed Palo Alto Research Lab for extended bandwidth.
* [[WP2051]]
* [[WP2052]]
 
==Pictures==
 
===R7912===
<gallery>
USA Tek R7912 FrontWork.jpg  |  R7912 connected to a modern video monitor
R7912 1.jpg | R7912 front
R7912 2.jpg | R7912 controls
R7912 3.jpg | R7912 rear
</gallery>
 
===7912AD===
<gallery>
7912ad tube.gif | 7912AD digitizer tube
7912ad-block.png | 7912AD block diagram
7912ad.jpg|7912AD front
Tek wp2000 1.jpg|WP 2000
Tek wp2000 2.jpg|WP 2000
Tek wp2000 3.jpg|WP 2000
IMG 20130408 115501.jpg|7912AD TV output on NTSC monitor
Tek7912ad ieee488 top.jpg|7912AD IEEE 488
Tek7912ad ieee488 bot.jpg|7912AD IEEE 488
Tek7912ad mpu top.jpg|7912AD MPU
Tek7912ad mpu bot.jpg|7912AD MPU
Tek7912ad 5156 bot.jpg|7912AD 5156
Tek7912ad 5156 top.jpg|7912AD 5156
Tek7912ad data buffer top.jpg|7912AD data buffer
Tek7912ad data buffer bot.jpg|7912AD data buffer
Tek7912ad translator top.jpg|7912AD translator
Tek7912ad translator bot.jpg|7912AD translator
Tek7912ad graticule gen top.jpg|7912AD graticule generator
Tek7912ad graticule gen bot.jpg|7912AD graticule generator
Tek7912ad x-y ramp gen top.jpg|7912AD X-Y ramp generator
Tek7912ad x-y ramp gen bot.jpg|7912AD X-Y ramp generator
Tek7912ad video proc top.jpg|7912AD video processor
Tek7912ad 4377.jpg|7912AD 4377
Tek7912ad horiz.jpg|7912AD horizontal
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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