3B1: Difference between revisions
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The Tektronix 3B1 is a | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|series=560-series scopes | |||
|type= 3B1 | |||
|summary=10 MHz time base plug-in | |||
|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. | |||
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> | ||
3b1 front.jpg|3B1 Front | |||
3b1 left.jpg|3B1 Left | |||
3b1 right.jpg|3B1 Right | |||
3b1 bottom.jpg|3B1 Bottom | |||
3b1 top.jpg|3B1 Top | |||
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
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 Left
-
3B1 Right
-
3B1 Bottom
-
3B1 Top
-
3B1 In 1965 Catalog
-
3B1 Normal Trigger Circuit
-
3B1 Delayed Trigger Circuit
-
3B1 Delay Pickoff Circuit
-
3B1 Normal Sweep Circuit
-
3B1 Delayed Sweep Circuit
-
3B1 Horizontal Amplifier Circuit
