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The Tektronix Type 565 is a [[dual-beam scopes|dual-beam scope]] that takes two [[2-series or 3-series vertical plug-ins]]. | The Tektronix Type 565 is a [[dual-beam scopes|dual-beam scope]] that takes two [[2-series or 3-series vertical plug-ins]]. | ||
It was [[introduced in 1963]]. | |||
A rackmount version, the RM565, was also produced. | |||
Aside from being dual-beam, the 565 is unusual among the | |||
[[ | other [[560-series scopes]] in the fact that it (the mainframe) has built-in | ||
are driven directly by the vertical plug-in. | trigger, sweep, and horizontal amplifier circuits. | ||
== Vertical Signal Path == | |||
As is usual for [[560-series scopes]], the vertical deflection plates of the CRT | |||
are driven directly, differentially, by pins 17 and 21 of the vertical plug-in. | |||
The left plug-in bay is for the lower beam and the right plug-in bay is for the upper beam. | |||
A 0.7-3pF trimmer capacitor is immediately behind each of the plug-in connectors, and allows | |||
for the mainframe to be calibrated so that plug-ins can be interchanged without requiring the | |||
high-frequency compensation of the system to be readjusted. | |||
The capacitance seen by the plug-in driving the scope should be 14.3pF for the lower beam and the | |||
same for the upper beam. | |||
There is no trigger pickoff in the vertical signal path of the 565. That function is performed by the plug-ins. | |||
== Trigger and Sweep == | |||
The triggering signal comes from pin 11 on the plug-ins, is amplified by a [[12AT7]]-based cathode follower, | |||
and sent to "TRIGGER" switches. From there, the trigger signal is sent through a [[6DJ8]]-based differential amplifier | |||
and then is discriminated by a [[6DJ8]]-based Schmitt trigger. | |||
The sweep delay can be adjusted over a range from 10 microseconds to 50 seconds. | |||
The 565 is also unusual in that it employs a [[tunnel diodes|tunnel diode]] in the trace intensification circuit. The tunnel diode | |||
forms as a bistable multivibrator: kick it one way and it turns on and stays on, kick it the other way and | forms as a bistable multivibrator: kick it one way and it turns on and stays on, kick it the other way and | ||
it turns off and stays off. | it turns off and stays off. | ||
== Calibrator == | |||
The internal calibrator produces 1kHz square waves with amplitude selectable | |||
in decade steps from 1 millivolt to 100 volts. | |||
It is an astable multivibrator formed by one half of a [[12AT7]] and a [[6AU6]]. | |||
The other half of the 12AT7 serves as the output cathode follower for the calibrator. | |||
== CRT == | |||
The 565 uses the [[T5650]] CRT. | |||
== Comparison with [[556]] == | |||
The 565 appears similar to the [[556]], but is different in many ways. | |||
The 556 uses tunnel diodes for triggering, while the 565 uses tubes. | |||
Also, the 556 uses [[letter-series and 1-series plug-ins]] | |||
while the 565 uses 560-series plug-ins. | |||
Also, the bandwidth of the 556 is specified as 50MHz, | |||
while the bandwidth of the 565 is specified as 10MHz. | |||
Subjectively, the trace of the 565 is very sharp, | |||
sharper than the trace of the 556. | |||
* [http://bama.edebris.com/download/tek/565/565.djvu Tektronix 565 Manual (DjVu)] | * [http://bama.edebris.com/download/tek/565/565.djvu Tektronix 565 Manual (DjVu)] |