7912: Difference between revisions

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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  
title=Tektronix 7912|
and a 7912HB which offers 750 MHz bandwidth.  
image=Tek-7912ad.jpg|
caption=Tektronix 7912AD with [[7A26]] and [[7B90P]] |
years=? — ?|
summary=500/750 MHz Digitizer|
manuals=
* [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Manual (PDF)]
}}
 
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.  


These instruments contain a special internal CRT-based digitizing [[scan converter]] tube  
These instruments contain a special internal CRT-based digitizing [[scan converter]] tube  
that is not visible from the outside.  The signal goes from the vertical plug-in to the  
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.   
vertical amplifier to the digitizing tube where it deflects a beam of electrons.   
The electrons hit a small flat rectangular target inside the tube.   
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.   
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 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 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,  
a form of scan converter.  Three output methods are provided: NTSC-out, X-Y low-speed analog,  
and a [[GPIB interface]]
and a [[GPIB interface]].


The resolution of the target is 512x512, giving 512 points in the time domain and 9-bit linear  
The resolution of the target is 512x512, giving 512 points in the time domain and 9-bit linear  
quantization of the input voltage.  Skipping 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 4V/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 above  
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The WP 2000 (067-0679-00) Digital Display Controller is an external module that interfaces with the 7912.
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]].
Plug-in modules intended for the 7912 have a 'P' suffix, meaning Programmable, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].


==Specifications==
==Specifications==

Revision as of 05:58, 1 July 2014

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

Produced from to

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures


The Tektronix 7912 is a high-speed digitizer that takes one 7000-series vertical plug-in and one 7000-series horizontal plug-in. There is a 7912AD which has 500 MHz bandwidth and a 7912HB which offers 750 MHz bandwidth.

These instruments contain a special internal CRT-based digitizing scan converter tube 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.

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 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

Pictures

  • 7912AD digitizer tube

    7912AD digitizer tube

  • R7912 front

    R7912 front

  • R7912 controls

    R7912 controls

  • R7912 rear

    R7912 rear

  • 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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