3B1: Difference between revisions
No edit summary |
(added specs, edited captions) |
||
| Line 3: | Line 3: | ||
summary=10 MHz time base | | summary=10 MHz time base | | ||
image=Tek 3b1 front.jpeg | | image=Tek 3b1 front.jpeg | | ||
caption=Tektronix 3B1 | caption=Tektronix 3B1 Front | | ||
introduced=1962 | | introduced=1962 | | ||
discontinued=(?) | | discontinued=(?) | | ||
| Line 13: | Line 13: | ||
}} | }} | ||
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}} | |||
==Internals== | ==Internals== | ||
| Line 35: | Line 39: | ||
==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> | ||
Revision as of 20:22, 16 September 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 |
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
