3B1: Difference between revisions
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The Tektronix 3B1 is a | {{Plugin Sidebar 2 | | ||
title=Tektronix 3B5 | | |||
summary=10 MHz time base | | |||
image=3b1 front.jpg | | |||
caption=Tektronix 3B1 front | | |||
introduced=1962 | | |||
discontinued=(?) | | |||
series=[[560-series scopes]] | | |||
manuals= | |||
* [http://w140.com/tek_3b1.pdf Tektronix 3B1 Manual (PDF)] | |||
}} | |||
The '''Tektronix 3B1''' is a time-base plug-in [[introduced in 1962]] for [[560-series scopes]]. | |||
10 MHz is is the maximum trigger frequency. | |||
The calibrated sweep rates go from 1 s/Div to 500 ns/Div. | The calibrated sweep rates go from 1 s/Div to 500 ns/Div. | ||
There is a switch that enables 5 × horizontal magnification, | There is a switch that enables 5 × horizontal magnification, | ||
which makes the fastest sweep 100 ns/Div. The 3B1 has a delayed sweep | which makes the fastest sweep 100 ns/Div. The 3B1 has a delayed sweep | ||
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The DC voltage is made by a [[ZZ1000]] 80 V reference passed through | 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 2.2 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. | ||
<gallery> | <gallery> | ||
File:3b1 front.jpg|Front | |||
File:3b1 left.jpg|Left | |||
File:3b1 right.jpg|Right | |||
File:3b1 bottom.jpg|Bottom | |||
File:3b1 top.jpg|Top | |||
File:3b1 cat3.jpg|In 1965 Catalog | |||
File:3b1 normal trigger.png|Normal trigger circuit | File:3b1 normal trigger.png|Normal trigger circuit | ||
File:3b1 delayed trigger.png|Delated trigger circuit | File:3b1 delayed trigger.png|Delated trigger circuit | ||
Revision as of 09:39, 21 August 2014
Template:Plugin Sidebar 2 The Tektronix 3B1 is a time-base plug-in introduced in 1962 for 560-series scopes. 10 MHz 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
