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{{Plugin Sidebar | | {{Plugin Sidebar | ||
manufacturer=Tektronix |series=560-series scopes |type= 3B1 | | |manufacturer=Tektronix | ||
summary=10 MHz time base | | |series=560-series scopes | ||
image=3b1 front. | |type= 3B1 | ||
caption=Tektronix 3B1 | |summary=10 MHz time base plug-in | ||
introduced=1962 | | |image=Tek 3b1 front.jpeg | ||
discontinued=(?) | | |caption=Tektronix 3B1 | ||
designers= | |introduced=1962 | ||
manuals= | |discontinued=(?) | ||
* [ | |designers= | ||
|manuals= | |||
* [[Media:070-344.pdf|Tektronix 3B1 Manual]] | |||
* [[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]] | ||
}} | }} | ||
The '''Tektronix 3B1''' is a time-base plug-in [[introduced in 1962]] for [[560-series scopes]]. | The '''Tektronix 3B1''' is a time-base plug-in [[introduced in 1962]] for [[560-series scopes]]. | ||
It is compatible with all the members of the 560 scope family other than the [[560]] itself. | |||
There is a switch that enables 5 × horizontal magnification, which makes the fastest sweep 100 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 has a delayed sweep and a regular sweep. | ||
{{ | {{BeginSpecs}} | ||
{{Spec | Trigger Frequency | DC to 10 MHz}} | |||
{{Spec | Sweep Speeds | 1 Sec/div to 0.5 μs/div in 20 1-2-5 steps}} | |||
{{Spec | Sweep Types | Normal and Delayed}} | |||
{{Spec | Sweep Magnification | x5}} | |||
{{EndSpecs}} | |||
==Links== | |||
{{Documents|Link=3B1}} | |||
==Internals== | ==Internals== | ||
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== | ||
<gallery> | <gallery> | ||
3b1 front.jpg|Front | 3b1 front.jpg|3B1 Front | ||
3b1 left.jpg|Left | 3b1 left.jpg|3B1 Left | ||
3b1 right.jpg|Right | 3b1 right.jpg|3B1 Right | ||
3b1 bottom.jpg|Bottom | 3b1 bottom.jpg|3B1 Bottom | ||
3b1 top.jpg|Top | 3b1 top.jpg|3B1 Top | ||
3b1 cat3.jpg|In 1965 Catalog | 3b1 cat3.jpg|3B1 In 1965 Catalog | ||
3b1 normal trigger.png|Normal | 3b1 normal trigger.png|3B1 Normal Trigger Circuit | ||
3b1 delayed trigger.png|Delayed | 3b1 delayed trigger.png|3B1 Delayed Trigger Circuit | ||
3b1 delay pickoff.png|Delay | 3b1 delay pickoff.png|3B1 Delay Pickoff Circuit | ||
3b1 normal sweep.png|Normal | 3b1 normal sweep.png|3B1 Normal Sweep Circuit | ||
3b1 delayed sweep.png|Delayed | 3b1 delayed sweep.png|3B1 Delayed Sweep Circuit | ||
3b1 horizontal amp.png|Horizontal | 3b1 horizontal amp.png|3B1 Horizontal Amplifier Circuit | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|3B1}} | |||
[[Category:560 series plugins]] | [[Category:560 series plugins]] | ||