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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= | introduced=1973 | | ||
discontinued=1989 | | discontinued=1989 | | ||
summary=500/750 MHz Digitizer| | summary=500/750 MHz Digitizer| | ||
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* [[Media:7912ad_theory.pdf | 7912AD Operator's Manual (partial, 57 pages from introduction)]] | * [[Media:7912ad_theory.pdf | 7912AD Operator's Manual (partial, 57 pages from introduction)]] | ||
* [http://w140.com/tek_7912_and_related_digitizer_docs.pdf 7912 and related digitizer documents] | * [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 | * [http://w140.com/7912ad_reading_gun_supply.pdf 7912AD Video preamp/Reading gun supply schematics] | ||
* [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD | * [http://w140.com/7912ad_writing_gun_supply.pdf 7912AD Z-Axis/HV board schematics] | ||
* ''complete service manual needed [[Category:Manual needed]]'' | |||
}} | }} | ||
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]]. | 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]]. | ||
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==R7912== | ==R7912== | ||
The '''R7912''', introduced in | The '''R7912''', introduced in September 1973 (Ref.1), achieved a bandwidth of 500 MHz with a [[7A19]] vertical amplifier plug-in. It was also possible, like in the [[7904]] scope, to access the CRT deflection plates directly through a [[7A21N]] plug-in and achieve a bandwidth of 1 GHz, albeit at reduced sensitivity (4 V/Div) and loss of triggering and readout functions. Some customers further modified the stock 7912 to increase bandwidth up to 3 GHz in special applications (see literature links below). | ||
The reading beam operates differently depending on the output mode. In TV mode, the reading beam scans the target in a horizontal format similar to that used in conventional television systems, and a video output compatible with TV monitors is generated. In Digital mode, the reading beam scans the target vertically, in 512 discrete steps for each of 512 horizontal positions. Waveforms are converted to digital, stored in memory, and can be read by a computer. | The reading beam operates differently depending on the output mode. In TV mode, the reading beam scans the target in a horizontal format similar to that used in conventional television systems, and a video output compatible with TV monitors is generated. In Digital mode, the reading beam scans the target vertically, in 512 discrete steps for each of 512 horizontal positions. Waveforms are converted to digital, stored in memory, and can be read by a computer. | ||
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==Literature and Software== | ==Literature and Software== | ||
# [http://tekretirees.org/Newsletter/nov2012_trn.pdf Hale Farley, ''The introduction of the R7912''] in Tek Retirees Newsletter 11/2012 | |||
# [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 -3 dB 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 Lockheed Palo Alto Research Lab study for LLL (June 1978)] describing the LM7912 Enhanced Performance Transient Digitizer, claiming 3 GHz bandwidth | |||
# [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://www.scottpages.net/MESCthesis.pdf Thesis on "7912ADM" upgrade version] | |||
# [http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/Transient%20Digitizers/RISOM2873.pdf ''Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET''. Risø National Laboratory, Denmark, June 1990] discussing how removing the delay line and replacing the compensation circuit can boost the 7912AD+7A29 combination to 1.1 GHz bandwidth | |||
# [http://w140.com/kurt/7912_gpib_examples.zip 7912 GPIB examples] | |||
==Links== | ==Links== | ||