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7844: Difference between revisions
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|designers=Murlan Kaufman;Chuck Scott;Dick Anderson;Keith Taylor;Bob White | |designers=Murlan Kaufman;Chuck Scott;Dick Anderson;Keith Taylor;Bob White | ||
|manuals= | |manuals= | ||
* [[Media:070-1676-02.pdf| 7844 Service Manual 070-1676-02]] (OCR, 70MB) | * [[Media:070-1676-02.pdf|7844 Service Manual 070-1676-02]] (OCR, 70MB) | ||
<small> | <small> | ||
'''Alternate copies''' | '''Alternate copies''' | ||
* [https://w140.com/mmm/tek-7844.pdf | * [https://w140.com/mmm/tek-7844.pdf 7844 Service Manual] (070-1676-02 10/1981, 265MB) | ||
* [http://bama.edebris.com/manuals/tek/7844/ 7844 Service Manual] at BAMA (070-1676-02, 10/1981, 109MB) | * [http://bama.edebris.com/manuals/tek/7844/ 7844 Service Manual] at BAMA (070-1676-02, 10/1981, 109MB) | ||
</small> | </small> | ||
}} | }} | ||
The '''Tektronix 7844''' is a 400 MHz [[dual-beam scopes|dual-beam CRT oscilloscope]] | The '''Tektronix 7844''' is a 400 MHz [[dual-beam scopes|dual-beam CRT oscilloscope]] that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins. | ||
that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins. | |||
Versions include the 7844 bench-top lab scope and R7844 rack-mount model. | Versions include the 7844 bench-top lab scope and R7844 rack-mount model. | ||
Circuit design for the 7844 was done by [[Chuck Scott]], [[Dick Anderson]], [[Keith Taylor]], and [[Bob White]]. Project manager for the 7844 was [[Murlan Kaufman]]. | Circuit design for the 7844 was done by [[Chuck Scott]], [[Dick Anderson]], [[Keith Taylor]], and [[Bob White]]. Project manager for the 7844 was [[Murlan Kaufman]]. | ||
The [[T7840|7844's CRT]] was designed by [[Conrad Odenthal]] and [[Ken Hawken]]. | |||
A typical configuration might have included [[7A19]] or [[7A24]] amplifiers, [[7B80]]/[[7B85]] or [[7B92A]] timebases. | A typical configuration might have included [[7A19]] or [[7A24]] amplifiers, [[7B80]]/[[7B85]] or [[7B92A]] timebases. | ||
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==Internals== | ==Internals== | ||
The [[T7840 | 7844's CRT]] has [[distributed vertical deflection plates]]. It uses a number of custom ICs, such as [[155-0064-00]], [[155-0065-00]] and [[155-0059-00]] in the vertical amplifiers, [[155-0095-00]] in the vertical interface, [[155-0078-00]] in the trigger selector, and [[155-0022-00]] in the horizontal interface. The horizontal and Z axis amplifiers are discrete. | The [[T7840|7844's CRT]] has [[distributed vertical deflection plates]]. It uses a number of custom ICs, such as [[155-0064-00]], [[155-0065-00]] and [[155-0059-00]] in the vertical amplifiers, [[155-0095-00]] in the vertical interface, [[155-0078-00]] in the trigger selector, and [[155-0022-00]] in the horizontal interface. The horizontal and Z axis amplifiers are discrete. | ||
The 7844 is more complex than all other 7000 mainframes except the [[7854]] because vertical and horizontal amplifiers as well as the Z axis control boards exist twice, and there is an extra switching logic board. As a consequence, verifying correct operation requires testing many possible combinations of settings – for example, a defect on the vertical switching board could cause a problem only in the case of both beam 1 and 2 using horizontal bay B, but not if beam 1 used A and beam 2 used B. | The 7844 is more complex than all other 7000 mainframes except the [[7854]] because vertical and horizontal amplifiers as well as the Z axis control boards exist twice, and there is an extra switching logic board. As a consequence, verifying correct operation requires testing many possible combinations of settings – for example, a defect on the vertical switching board could cause a problem only in the case of both beam 1 and 2 using horizontal bay B, but not if beam 1 used A and beam 2 used B. | ||