3B3: Difference between revisions

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The 3B3 provides an intensified mode that indicates the selected region of interest in the  
The 3B3 provides an intensified mode that indicates the selected region of interest in the  
delayed sweep by showing the entire waveform with the trace brighter in the selected region.
delayed sweep by showing the entire waveform with the trace brighter in the selected region.
==Specifications==
[[Category:Specifications needed]] ''please add''
==Internals==


Triggering is done using a 2 mA germanium [[tunnel diodes|tunnel diode]].  The trigger source  
Triggering is done using a 2 mA germanium [[tunnel diodes|tunnel diode]].  The trigger source  
Line 28: Line 33:
the [[1N270]]) to protect the transistors of the front-end differential amplifier.  
the [[1N270]]) to protect the transistors of the front-end differential amplifier.  
Starting at serial number 1030, silicon diodes were used for that function.
Starting at serial number 1030, silicon diodes were used for that function.
==Specifications==
[[Category:Specifications needed]] ''please add''


==Pictures==
==Pictures==
<gallery>
<gallery>
Image:3b3 front.jpg
3b3 front.jpg
Image:3b3 right.jpg
3b3 right.jpg
Image:3b3 left.jpg
3b3 left.jpg
File:Tek 3b3 block.png|Block Diagram
Tek 3b3 block.png|Block Diagram
File:Tek 3b3 delay pickoff.png|Delay Pickoff
Tek 3b3 delay pickoff.png|Delay Pickoff
File:Tek 3b3 early delayed sweep trigger.png|Delayed Sweep Trigger
Tek 3b3 early delayed sweep trigger.png|Delayed Sweep Trigger
File:Tek 3b3 early delayed sweep.png|Delayed Sweep
Tek 3b3 early delayed sweep.png|Delayed Sweep
File:Tek 3b3 delayed sweep timing switch.png|Delayed Sweep Timing Switch
Tek 3b3 delayed sweep timing switch.png|Delayed Sweep Timing Switch
File:Tek 3b3 mode switch.png|Mode Switch
Tek 3b3 mode switch.png|Mode Switch
File:Tek 3b3 delay pickoff.png|Delay Pickoff
Tek 3b3 delay pickoff.png|Delay Pickoff
File:Tek 3b3 early normal trigger.png|Normal Trigger
Tek 3b3 early normal trigger.png|Normal Trigger
File:Tek 3b3 normal sweep timing switch.png|Normal Sweep Timing Switch
Tek 3b3 normal sweep timing switch.png|Normal Sweep Timing Switch
File:Tek 3b3 horizontal amp.png|Horizontal Amp
Tek 3b3 horizontal amp.png|Horizontal Amp
Tek 3b3 11891.jpg
Tek 3b3 11891.jpg
Tek 3b3 11891_2.jpg
Tek 3b3 11891_2.jpg

Revision as of 12:12, 26 September 2017

Template:Plugin Sidebar 2 The Tektronix Type 3B3 is sweep unit (time base) introduced in 1963, intended for use with the 561A. It works fine in other 560-series scopes.

It provides a calibrated delay from 500 ns to 10 s after the trigger event, before sweeping. Delayed sweep allows the operator to "zoom in" on regions of interest in a waveform.

The 3B3 provides an intensified mode that indicates the selected region of interest in the delayed sweep by showing the entire waveform with the trace brighter in the selected region.

Specifications

please add

Internals

Triggering is done using a 2 mA germanium tunnel diode. The trigger source is buffered by a 7895 Nuvistor triode cathode-follower driving a differential amplifier formed by two 2N2207 germanium PNP transistors. The collector current switches the tunnel diode when a triggering event occurs.

Up to serial number 1029, the 3B3 uses Transitron T12G germanium diodes (equivalent to the 1N270) to protect the transistors of the front-end differential amplifier. Starting at serial number 1030, silicon diodes were used for that function.

Pictures