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3B1: Difference between revisions
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m (→top: clean up, replaced: title=Tektronix → manufacturer=Tektronix |series=560-series scopes |type=, {{Plugin Sidebar 2 → {{Plugin Sidebar, series=560-series scopes → designers=) |
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designers= | | designers= | | ||
manuals= | manuals= | ||
* [ | * [[Media:070-344.pdf|Tektronix 3B1 Manual]] (PDF) | ||
* [[Media:070-449.pdf|Tektronix 3B1 Performance Check Out]] | * [[Media:070-449.pdf|Tektronix 3B1 Performance Check Out]] | ||
* [[Media:050-0582-00-TEK_3B1-3B3-MOD.pdf|050-0582-00 Germanium Transistor Replacement]] | * [[Media:050-0582-00-TEK_3B1-3B3-MOD.pdf|050-0582-00 Germanium Transistor Replacement]] | ||
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The 3B1 uses vacuum tubes, bipolar junction transistors, and [[tunnel diodes]]. | The 3B1 uses vacuum tubes, bipolar junction transistors, and [[tunnel diodes]]. | ||
The trigger input goes through the int/ext switch and then the | The trigger input goes through the int/ext switch and then the AC/DC coupling switch, and then a [[7895]] cathode follower. | ||
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. | ||
drives one base of a [[2N2207]] PNP differential amplifier which has a tunnel diode | 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. | ||
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. | |||
The delay pickoff circuit is a [[6DJ8]] differential amplifier that | The delay pickoff circuit is a [[6DJ8]] differential amplifier that compares the sweep ramp voltage with a knob-controlled DC voltage which determines the point where the delayed trigger starts. | ||
compares the sweep ramp voltage with a knob-controlled | The DC voltage is made by a [[ZZ1000]] 80 V reference passed through a potentiometer-variable voltage divider. | ||
DC voltage which determines the point where the delayed trigger starts. | |||
The DC voltage is made by a [[ZZ1000]] 80 V reference passed through | |||
a potentiometer-variable voltage divider. | |||
When the sweep ramp exceeds the control voltage, a 2.2 mA tunnel diode in the | When the sweep ramp exceeds the control voltage, a 2.2 mA tunnel diode in the plate load of the differential amplifier switches state. | ||
plate load of the differential amplifier switches state. | |||
==Pictures== | ==Pictures== | ||