7912: Difference between revisions

Revision as of 16:47, 27 September 2015

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500/750 MHz Digitizer Tektronix 7912AD with 7A26 and 7B90P Produced from 1972 to 1989 Manuals Tektronix 7934 Manual (PDF) (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 (T7912) 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

Links

Dale Aufrecht: An Intelligent, Programmable Transient Digitizer (7912AD). In TekScope Vol. 11 No. 1, 1979

Pictures

7912AD digitizer tube
R7912 front
R7912 controls
R7912 rear
7912AD front
WP 2000
WP 2000
WP 2000
7912AD TV output on NTSC monitor
7912AD IEEE 488
7912AD IEEE 488
7912AD MPU
7912AD MPU
7912AD 5156
7912AD 5156
7912AD data buffer
7912AD data buffer
7912AD translator
7912AD translator
7912AD graticule generator
7912AD graticule generator
7912AD X-Y ramp generator
7912AD X-Y ramp generator
7912AD video processor
7912AD 4377
7912AD horizontal
7912AD scan amplifier

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-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 7912HD which offers 750 MHz bandwidth.
+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 ([[T7912]])