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3B1: Difference between revisions
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The Tektronix 3B1 is a timebase plug-in [[introduced in 1962]] for [[560-series scopes]]. | The Tektronix 3B1 is a timebase plug-in [[introduced in 1962]] for [[560-series scopes]]. | ||
10MHz is is the maximum trigger frequency. | |||
The calibrated sweep rates go from 1 sec/div to 500 nsec/div. | The calibrated sweep rates go from 1 sec/div to 500 nsec/div. | ||
There is a switch that enables 5X horizontal magnification, | There is a switch that enables 5X horizontal magnification, | ||
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and a regular sweep. The 3B1 uses vacuum tubes, bipolar junction transistors, | and a regular sweep. The 3B1 uses vacuum tubes, bipolar junction transistors, | ||
and [[tunnel diodes]]. | and [[tunnel diodes]]. | ||
The trigger input goes through the int/ext switch and then the ac/dc coupling | |||
switch, and then a [[7895]] cathode follower. The output of the cathode follower | |||
drives one base of a [[2N2207]] PNP differential amplifier which has a tunnel diode | |||
in the collector load. The tunnel diode generates pulses when it switches back | |||
and forth between its two stable voltages, which are capacitively coupled to a | |||
[[2N2501]] NPN common emitter amplifier. | |||
* [http://w140.com/tek_3b1.pdf Tektronix 3B1 Manual (PDF)] | * [http://w140.com/tek_3b1.pdf Tektronix 3B1 Manual (PDF)] | ||