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The Tektronix 3B1 is a timebase plug-in [[introduced in 1962]] for [[560-series scopes]].   
{{Plugin Sidebar
The calibrated sweep rates go from 1 sec/div to 500 nsec/div.
|manufacturer=Tektronix
There is a switch that enables 5X horizontal magnification,
|series=560-series scopes
which makes the fastest sweep 100 nsec/div.  The 3B1 has a delayed sweep
|type= 3B1
and a regular sweep.  The 3B1 uses vacuum tubes, bipolar junction transistors,
|summary=10 MHz time base plug-in
and [[tunnel diodes]].
|image=Tek 3b1 front.jpeg
|caption=Tektronix 3B1
|introduced=1962
|discontinued=(?)
|designers=
|manuals=
* [[Media:070-344.pdf|Tektronix 3B1 Manual]]
* [[Media:070-449.pdf|Tektronix 3B1 Performance Check Out]]
* [[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]].   
It is compatible with all the members of the 560 scope family other than the [[560]] itself.


* [http://w140.com/tek_3b1.pdf Tektronix 3B1 Manual (PDF)]
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.


{{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==
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.
==Pictures==
<gallery>
<gallery>
Image:3b1 front.jpg|Front  
3b1 front.jpg|3B1 Front  
Image:3b1 left.jpg|Left
3b1 left.jpg|3B1 Left
Image:3b1 right.jpg|Right
3b1 right.jpg|3B1 Right
Image:3b1 bottom.jpg|Bottom
3b1 bottom.jpg|3B1 Bottom
Image:3b1 top.jpg|Top
3b1 top.jpg|3B1 Top
Image:3b1 cat3.jpg|In 1965 Catalog
3b1 cat3.jpg|3B1 In 1965 Catalog
3b1 normal trigger.png|3B1 Normal Trigger Circuit
3b1 delayed trigger.png|3B1 Delayed Trigger Circuit
3b1 delay pickoff.png|3B1 Delay Pickoff Circuit
3b1 normal sweep.png|3B1 Normal Sweep Circuit
3b1 delayed sweep.png|3B1 Delayed Sweep Circuit
3b1 horizontal amp.png|3B1 Horizontal Amplifier Circuit
</gallery>
</gallery>
==Components==
{{Parts|3B1}}
[[Category:560 series plugins]]

Latest revision as of 04:43, 29 November 2023

Tektronix 3B1
10 MHz time base plug-in
Tektronix 3B1

Compatible with 560-series scopes

Produced from 1962 to (?)

Manuals
Manuals – Specifications – Links – Pictures

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. The 3B1 has a delayed sweep and a regular sweep.

Key Specifications

Trigger Frequency DC to 10 MHz
Sweep Speeds 1 Sec/div to 0.5  μs/div in 20 1-2-5 steps
Sweep Types Normal and Delayed
Sweep Magnification x5

Links

Documents Referencing 3B1

(no results)

Internals

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.

Pictures

  • 3B1 Front

    3B1 Front

  • 3B1 Left

    3B1 Left

  • 3B1 Right

    3B1 Right

  • 3B1 Bottom

    3B1 Bottom

  • 3B1 Top

    3B1 Top

  • 3B1 In 1965 Catalog

    3B1 In 1965 Catalog

  • 3B1 Normal Trigger Circuit

    3B1 Normal Trigger Circuit

  • 3B1 Delayed Trigger Circuit

    3B1 Delayed Trigger Circuit

  • 3B1 Delay Pickoff Circuit

    3B1 Delay Pickoff Circuit

  • 3B1 Normal Sweep Circuit

    3B1 Normal Sweep Circuit

  • 3B1 Delayed Sweep Circuit

    3B1 Delayed Sweep Circuit

  • 3B1 Horizontal Amplifier Circuit

    3B1 Horizontal Amplifier Circuit

Components

Some Parts Used in the 3B1

Part Part Number(s) Class Description Used in
1N3714 152-0081-00 Discrete component 2.2 mA, 25 pF germanium tunnel diode 546 • 547 • 556 • 21A • 22A • 3B1 • 3B2 • 3B3 • 422 • 491 • 283
2N2207 151-063 • 151-0063-00 Discrete component germanium PNP transistor 3B1 • 3B3 • 3S76 • 321A • 547
6AL5 154-016 • 154-0016-00 • 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 • 181 • 190 • 1M1 • 310 • 310A • 315 • 316 • 317 • 3B1 • 3B1S • 3B2 • 3B3 • 3B5 • 502 • 502A • 503 • 511 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 535A • 545 • 545A • 549 • 551 • 565 • 570 • 581 • 581A • 585 • 585A • C • T • Telequipment D52 • Telequipment D56 • Telequipment S52
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 • 2B67 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 503 • 504 • 506 • 516 • 549 • 561 • 561A • 561S • 564 • 565 • 567 • Telequipment D52 • Telequipment D56 • Telequipment S31 • Telequipment S32 • Telequipment S32A • Telequipment S51 • Telequipment S52
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
7895 154-0378-00 Vacuum Tube (Triode) Nuvistor Triode 3B1 • 3B1S • 3B3
RT5204 151-0058-00 Discrete component Silicon NPN transistor 565 • RM565 • Z • 2A61 • 3B1 • 3B3 • 3S76 • 3T77
ZZ1000 154-370 • 154-0370-00 Gas Discharge Tube (Voltage regulator) 81 V voltage reference 129 • 3B1 • 3B1S • 3B2 • 3B3 • 3S76 • 422 • S-311
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