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647: Difference between revisions
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The 647 uses 10 series vertical and 11 series time base plug-ins. At introduction, the [[10A2]] a dual channel 50 MHz vertical, [[11A1]] single time base, and [[11A2]] dual time base were offered. The plug-ins were unique to the 647 and 647A. Unlike the threaded knob used for retaining the [[letter-series_plug-ins|530/540 series plug-ins]], the 647 used a lever actuated cam mechanism. The single lever both engaged and disengaged the plug-in with a quick, smooth motion. Many users considered it to be the best plug-in retaining system Tek had ever offered. | The 647 uses 10 series vertical and 11 series time base plug-ins. At introduction, the [[10A2]] a dual channel 50 MHz vertical, [[11A1]] single time base, and [[11A2]] dual time base were offered. The plug-ins were unique to the 647 and 647A. Unlike the threaded knob used for retaining the [[letter-series_plug-ins|530/540 series plug-ins]], the 647 used a lever actuated cam mechanism. The single lever both engaged and disengaged the plug-in with a quick, smooth motion. Many users considered it to be the best plug-in retaining system Tek had ever offered. | ||
Unlike the [[560-series_scopes|560 series]] where the plug-ins directly drive the CRT deflection plates, the 647 has amplifiers for both the vertical and horizontal signals in the mainframe. In addition to supporting the higher bandwidth, the amplifiers provide a normalized gain at the plug-in interface, eliminating the need to adjust the gain or sweep cal every time a plug-in was swapped. | Unlike the [[560-series_scopes|560 series]] | ||
where the plug-ins directly drive the CRT deflection plates, | |||
the 647 has amplifiers for both the vertical | |||
and horizontal signals in the mainframe. | |||
In addition to supporting the higher bandwidth, | |||
the amplifiers provide a normalized gain at the plug-in interface, | |||
eliminating the need to adjust the gain or | |||
sweep cal every time a plug-in was swapped. | |||
The horizontal and vertical plugs are not electrically interchangeable. Only a 10 series plug-in will work in the vertical compartment, and only a 11 series time base will work in the horizontal compartment. X-Y mode requires the use of the external horizontal input in an 11 series time base. | The vertical amplifier also contained a [[delay line]]. | ||
The interface between the vertical plug-in and the mainframe | |||
is a 93-ohm controlled-impedance connection. | |||
This is in contrast to the [[500-series scopes]], | |||
which appear to the plug-in as a high impedance. | |||
The horizontal and vertical plugs are not electrically interchangeable. | |||
Only a 10 series plug-in will work in the vertical compartment, | |||
and only a 11 series time base will work in the horizontal compartment. | |||
X-Y mode requires the use of the external horizontal input in an 11 series time base. | |||
* [http://w140.com/kurt/647.pdf Tektronix 647 Manual (PDF)] | * [http://w140.com/kurt/647.pdf Tektronix 647 Manual (PDF)] | ||