7912: Difference between revisions

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==7912AD and 7912HB==

From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]] and could drive X-Y monitors directly. In contrast to the earlier R7912 the readout characters in video mode ~~are now~~ created digitally and directly injected into the video signal.

From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]] and could drive X-Y monitors directly. In contrast to the earlier R7912, the readout characters in video mode were created digitally and directly injected into the video signal.

The 7912AD has 500 MHz bandwidth. It was succeeded by the 750 MHz '''7912HB''' in 1987 (using a [[7A29P]] amplifier).

For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P' suffix~~, meaning Programmable,~~

For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P'

were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].

(Programmable) suffix were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].

===7912AD Options===

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==Internals==

Three output methods are provided: Video (NTSC or PAL), X-Y-Z low-speed analog, and a [[GPIB interface]]. For video-out Tektronix ~~recommends~~ the [[634|634 monitor]] or a monitor from the 650- and 670-series and a 75 Ω termination. For X-Y-Z analog Tek ~~recommends~~ a 600-series monitor and no specific termination requirement.

Three output methods are provided: Video (NTSC or PAL), X-Y-Z low-speed analog, and a [[GPIB interface]]. For video-out, Tektronix recommended the [[634|634 monitor]] or a monitor from the 650- and 670-series and a 75 Ω termination. For X-Y-Z analog, Tek recommended a 600-series monitor and no specific termination requirement.

With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases.

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==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.]

# [[Patent US 3748585A|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

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* [[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]]

* [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org]

@@ Line 74: / Line 74: @@
 ==7912AD and 7912HB==
-From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]] and could drive X-Y monitors directly. In contrast to the earlier R7912 the readout characters in video mode are now created digitally and directly injected into the video signal.
+From the '''7912AD''' (1978) on, the instrument had a standard [[GPIB interface]] and could drive X-Y monitors directly. In contrast to the earlier R7912, the readout characters in video mode were created digitally and directly injected into the video signal.
 The 7912AD has 500 MHz bandwidth.  It was succeeded by the 750 MHz '''7912HB''' in 1987 (using a [[7A29P]] amplifier).
-For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P' suffix, meaning Programmable,
+For the 7912AD and 7912HB, special GPIB-controllable plug-in modules with a 'P'
-were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
+(Programmable) suffix were available, e.g. [[7A16P]], [[7A29P]] and [[7B90P]].
 ===7912AD Options===
@@ Line 85: / Line 85: @@
 ==Internals==
-Three output methods are provided: Video (NTSC or PAL), X-Y-Z low-speed analog, and a [[GPIB interface]]. For video-out Tektronix recommends the [[634|634 monitor]] or a monitor from the 650- and 670-series and a 75 Ω termination. For X-Y-Z analog Tek recommends a 600-series monitor and no specific termination requirement.
+Three output methods are provided: Video (NTSC or PAL), X-Y-Z low-speed analog, and a [[GPIB interface]]. For video-out, Tektronix recommended the [[634|634 monitor]] or a monitor from the 650- and 670-series and a 75 Ω termination. For X-Y-Z analog, Tek recommended a 600-series monitor and no specific termination requirement.
 With aftermarket modifications to the electronics, 7912AD bandwidths have been extended up to 3 GHz in special cases.
@@ Line 95: / Line 95: @@
 ==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.]
+# [[Patent US 3748585A|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
@@ Line 106: / Line 106: @@
 * [[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]]
 * [http://www.radiomuseum.org/r/tektronix_7912ad.html Tek 7912AD @ radiomuseum.org]

7912: Difference between revisions

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