7912: Difference between revisions

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image=Tek-7912ad.jpg|
image=Tek-7912ad.jpg|
caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] |
caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] |
introduced=1972 |
introduced=1974 |
discontinued=1989 |
discontinued=1989 |
summary=500/750 MHz Digitizer|
summary=500/750 MHz Digitizer|
manuals=
manuals=
* [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Manual (PDF)]
* [http://w140.com/7912ad_theory.pdf 7912AD Theory]
* [http://w140.com/tek_7912_and_related_digitizer_docs.pdf 7912 and related digitizer documents]
* [http://w140.com/7912ad_reading_gun_supply.pdf 7912AD Reading Gun Supply]
* [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD Writing Gun Supply]
 
}}
}}


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.  
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]]) 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 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.
 
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.


These instruments contain a special internal CRT-based digitizing [[scan converter]] tube ([[T7912]])
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]].
that is not visible from the outside.  The signal goes from the vertical plug-in to the
vertical amplifier to the digitizing tube where it deflects a beam of electrons. 
The electrons hit a small flat rectangular target inside the tube. 
This target is a solid state image sensor, conceptually similar to that in a digital camera.


==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 trace is read from the target by electronics in the 7912AD, digitized, and stored in memory.   
The reading of the target is asynchronous from the sweep and therefore the tube can be considered  
The reading of the target is asynchronous to the sweep and therefore the tube can be considered a form of scan converter.   
a form of scan converter.  Three output methods are provided: NTSC-out, X-Y low-speed analog,  
 
and a [[GPIB interface]].
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
  Bypassing the vertical amplifier, the 7912 can provide a
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.   
bandwidth of 1 GHz with a sensitivity of 4 V/Div.   


With aftermarket modifications to the electronics, 7912AD bandwidths have been extended above
With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases.  
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 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==
==Specifications==
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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 uses 360 watts maximum.


==Manuals==
==Literature and Software==


* http://w140.com/7912ad_theory.pdf
* [http://w140.com/kurt/7912_gpib_examples.zip 7912 GPIB examples]
* http://w140.com/tek_7912_and_related_digitizer_docs.pdf
* [http://www.scottpages.net/MESCthesis.pdf Thesis on "7912ADM" upgrade version]
* http://w140.com/kurt/7912_gpib_examples.zip
* [http://w140.com/US3748585.pdf US Patent 3748585: Silicon Diode Array Scan Converter Tube and Method of Operation. Culter et al. July 1973.]
* http://130.226.56.153/rispubl/reports_INIS/RISOM2873.pdf
* 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.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://www.iaea.org/inis/collection/NCLCollectionStore/_Public/10/434/10434659.pdf
* http://w140.com/boyer_data_acq_ebeam_fus_acc.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==
==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]]
* [[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]
Line 66: Line 75:
==Pictures==
==Pictures==


===R7912===
<gallery>
<gallery>
7912ad tube.gif | 7912AD digitizer tube
USA Tek R7912 FrontWork.jpg  |   R7912 connected to a modern video monitor
7912ad-block.png | 7912AD block diagram
R7912 1.jpg | R7912 front
R7912 1.jpg | R7912 front
R7912 2.jpg | R7912 controls
R7912 2.jpg | R7912 controls
R7912 3.jpg | R7912 rear
R7912 3.jpg | R7912 rear
</gallery>
===7912AD===
<gallery>
7912ad tube.gif | 7912AD digitizer tube
7912ad-block.png | 7912AD block diagram
7912ad.jpg|7912AD front
7912ad.jpg|7912AD front
Tek wp2000 1.jpg|WP 2000
Tek wp2000 1.jpg|WP 2000

Revision as of 08:15, 28 February 2017

{{{manufacturer}}} 
500/750 MHz Digitizer
Tektronix 7912AD with 7A26 and 7B90P

Produced from 1974 to 1989

Manuals
Manuals – Specifications – Links – Pictures


The Tektronix 7912 was a series of high-speed digitizers that take one 7000-series vertical plug-in and one 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. 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.

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.

The technology was designed at Tektronix in the 1970's and sold through the 1980's. They were expensive.

Specifications

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

Literature and Software

Links

See Also

Pictures

R7912

  • R7912 connected to a modern video monitor

    R7912 connected to a modern video monitor

  • R7912 front

    R7912 front

  • R7912 controls

    R7912 controls

  • R7912 rear

    R7912 rear

7912AD

  • 7912AD digitizer tube

    7912AD digitizer tube

  • 7912AD block diagram

    7912AD block diagram

  • 7912AD front

    7912AD front

  • WP 2000

    WP 2000

  • WP 2000

    WP 2000

  • WP 2000

    WP 2000

  • 7912AD TV output on NTSC monitor

    7912AD TV output on NTSC monitor

  • 7912AD IEEE 488

    7912AD IEEE 488

  • 7912AD IEEE 488

    7912AD IEEE 488

  • 7912AD MPU

    7912AD MPU

  • 7912AD MPU

    7912AD MPU

  • 7912AD 5156

    7912AD 5156

  • 7912AD 5156

    7912AD 5156

  • 7912AD data buffer

    7912AD data buffer

  • 7912AD data buffer

    7912AD data buffer

  • 7912AD translator

    7912AD translator

  • 7912AD translator

    7912AD translator

  • 7912AD graticule generator

    7912AD graticule generator

  • 7912AD graticule generator

    7912AD graticule generator

  • 7912AD X-Y ramp generator

    7912AD X-Y ramp generator

  • 7912AD X-Y ramp generator

    7912AD X-Y ramp generator

  • 7912AD video processor

    7912AD video processor

  • 7912AD 4377

    7912AD 4377

  • 7912AD horizontal

    7912AD horizontal

  • 7912AD scan amplifier

    7912AD scan amplifier

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