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. | 10MHz is is the maximum trigger frequency. | ||
The calibrated sweep rates go from 1 | The calibrated sweep rates go from 1 s/Div to 500 ns/Div. | ||
There is a switch that enables | There is a switch that enables 5 × horizontal magnification, | ||
which makes the fastest sweep 100 | which makes the fastest sweep 100 ns/Div. The 3B1 has a delayed sweep | ||
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]]. | ||
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compares the sweep ramp voltage with a knob-controlled | compares the sweep ramp voltage with a knob-controlled | ||
DC voltage which determines the point where the delayed trigger starts. | DC voltage which determines the point where the delayed trigger starts. | ||
The DC voltage is made by a [[ZZ1000]] | The DC voltage is made by a [[ZZ1000]] 80 V reference passed through | ||
a potentiometer-variable voltage divider. | a potentiometer-variable voltage divider. | ||
When the sweep ramp exceeds the control voltage, a 2. | 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. | ||
| Line 38: | Line 38: | ||
File:3b1 horizontal amp.png|Horizontal amp circuit | File:3b1 horizontal amp.png|Horizontal amp circuit | ||
</gallery> | </gallery> | ||
[[Category:560 series plugins]] | |||
Revision as of 06:22, 29 June 2014
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 s/Div to 500 ns/Div. There is a switch that enables 5 × horizontal magnification, which makes the fastest sweep 100 ns/Div. The 3B1 has a delayed sweep and a regular sweep. The 3B1 uses vacuum tubes, bipolar junction transistors, 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.
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. 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 plate load of the differential amplifier switches state.
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Front
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Left
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Right
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Bottom
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Top
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In 1965 Catalog
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Normal trigger circuit
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Delated trigger circuit
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Delay pickoff circuit
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Normal sweep circuit
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Delayed sweep circuit
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Horizontal amp circuit
