7104: Difference between revisions

Jump to navigation Jump to search

7104 (view source)

Revision as of 09:06, 25 October 2015

17 bytes removed ,  25 October 2015
no edit summary
No edit summary
No edit summary
Line 11: Line 11:
The '''Tektronix 7104''' is a 1 GHz, non-storage 7000-series oscilloscope mainframe that takes two [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]] and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]].  It was introduced in 1978.  There is also a rack-mount version, the [[R7103]], albeit with only one horizontal bay.
The '''Tektronix 7104''' is a 1 GHz, non-storage 7000-series oscilloscope mainframe that takes two [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]] and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]].  It was introduced in 1978.  There is also a rack-mount version, the [[R7103]], albeit with only one horizontal bay.


The scope employs a [[micro-channel plate]] (MCP) CRT design to get good screen intensity at high sweep speeds with moderate acceleration voltage. However, the MCP's amplification degrades irreversibly with operation, in proportion to the log of total charge passed per channel or display area.  For this reason, continued operation with a steady trace and especially at large beam currents must be avoided.  The 7104 contains a "limited viewing time" circuit to assist with observing this restriction.  At beam currents above 0.2 μA, a yellow indicator illuminates, and the beam will be shut down after 20 minutes.  The limit time drops to two minutes at an average beam current of 2 μA, and also limits the average current to that value.  Single-shot display current is not affected.  Despite this limiter, older instruments often exhibit darkening of the screen around the horizontal center line to some degree (see [[Media:Tek7104-200ps-singleshot-sin1-1g.jpg|screen shot]]). 
The scope employs a [[micro-channel plate]] (MCP) CRT design to get good screen intensity at high sweep speeds with moderate acceleration voltage.


The high speed necessitated using [[distributed deflection plates]] also for the horizontal deflection system, which reaches a bandwidth of 350 MHz.  An optional horizontal delay line makes the high horizontal bandwidth available for X-Y mode at a phase shift of <2&deg; up to 50 MHz, nullable at any frequency up to 250 MHz.
The high speed necessitated using [[distributed deflection plates]] also for the horizontal deflection system, which reaches a  
bandwidth of 350 MHz.  Option 2 adds a horizontal delay line to make the high horizontal bandwidth available for X-Y mode  
at a phase shift of <2&deg; up to 50 MHz, nullable at any frequency up to 250 MHz.


The [[7A29]] 1 GHz vertical amplifier and the  [[7B15]]/[[7B10]] time base pair were introduced along with the 7104 to match the system bandwidth.   
The [[7A29]] 1 GHz vertical amplifier and the  [[7B15]]/[[7B10]] time base pair were introduced along with the 7104 to match the system bandwidth.   
Option 2 adds a horizontal delay line for extended-frequency X-Y operation.


{{BeginSpecs}}
{{BeginSpecs}}
Line 37: Line 37:
}}
}}
{{EndSpecs}}
{{EndSpecs}}
==MCP protection==
The Micro Channel Plate's amplification degrades irreversibly with operation, in proportion to the log of total charge passed per channel or display area.  For this reason, continued operation with a steady trace and especially at large beam currents must be avoided.  The 7104 contains a "limited viewing time" circuit to assist with observing this restriction.  At beam currents above 0.2 μA, a yellow indicator illuminates, and the beam will be shut down after 20 minutes.  The limit time drops to two minutes at an average beam current of 2 μA, and also limits the average current to that value.  Single-shot display current is not affected.  Despite this limiter, older instruments often exhibit darkening of the screen around the horizontal center line to some degree (see [[Media:Tek7104-200ps-singleshot-sin1-1g.jpg|screen shot]]). 


==Internals==
==Internals==
Line 80: Line 83:
==Links==
==Links==
* [[Hans Springer]]: 1 GHz at 10 mV in a General Purpose Plug-in Oscilloscope.  In [[Media:Tekscope 1979 V11 N1.pdf | TekScope Vol. 11 No. 1, 1979]]
* [[Hans Springer]]: 1 GHz at 10 mV in a General Purpose Plug-in Oscilloscope.  In [[Media:Tekscope 1979 V11 N1.pdf | TekScope Vol. 11 No. 1, 1979]]
* Hans Springer's 1979 [http://www.vintagetek.org/wp-content/uploads/2011/10/7104-Springer-article-email-res.pdf Electronic Design article on 7104]
* Hans Springer's 1979 [http://www.vintagetek.org/wp-content/uploads/2011/10/7104-Springer-article-email-res.pdf Electronic Design article on the 7104]
* [http://readingjimwilliams.blogspot.com/2011/08/scope-sunday-4.html Reading Jim Williams: Scope Sunday 4]
* [http://readingjimwilliams.blogspot.com/2011/08/scope-sunday-4.html Reading Jim Williams: Scope Sunday 4]
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7104.htm Tek 7104 page @ amplifier.cd]
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7104.htm Tek 7104 @ amplifier.cd]
* http://www.barrytech.com/tektronix/tek7000/tek7104.html
* [http://www.barrytech.com/tektronix/tek7000/tek7104.html Tek 7104 @ barrytech.com]
* [https://web.archive.org/web/20110926020847/http://www.oregonlive.com/silicon-forest/index.ssf/2011/09/a_tektronix_oscilloscope_that.html A Tektronix oscilloscope that moved faster than light?] The Oregonian, 23 Sep 2011.  (Original no longer accessible, link via archive.org.)
* [https://web.archive.org/web/20110926020847/http://www.oregonlive.com/silicon-forest/index.ssf/2011/09/a_tektronix_oscilloscope_that.html A Tektronix oscilloscope that moved faster than light?] The Oregonian, 23 Sep 2011.  (Original no longer accessible, link via archive.org.)


Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/19195"

Navigation menu