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The Tektronix Type 3B3 is sweep unit [[introduced in 1963]], intended for use with the [[561|561A]]. | {{Plugin Sidebar| | ||
It works fine in other [[560-series scopes]]. | title=Tektronix 3B3| | ||
It provides a calibrated delay from | summary=Time Base| | ||
image=3b3 front.jpg| | |||
caption=3B3 front view| | |||
years=1963 – ? | | |||
type=Horizontal| | |||
series=[[560-series scopes]]| | |||
manuals= | |||
* [http://bama.edebris.com/download/tek/3b3/3b3.djvu Tektronix 3B3 Manual (DjVu)] | |||
* [http://w140.com/3b3.pdf Tektronix 3B3 Manual (PDF)] | |||
}} | |||
The '''Tektronix Type 3B3''' is sweep unit (time base) [[introduced in 1963]], intended | |||
for use with the [[561|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. | 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 | 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. | ||
Triggering is done using a | |||
a [[7895]] Nuvistor triode cathode-follower driving a differential amplifier formed by two | Triggering is done using a 2 mA germanium [[tunnel diodes|tunnel diode]]. The trigger source | ||
[[2N2207]] germanium PNP transistors. The collector current switches the tunnel diode when | is buffered by a [[7895]] Nuvistor triode cathode-follower driving a differential amplifier | ||
a triggering event occurs. | formed by two [[2N2207]] germanium PNP transistors. The collector current switches the | ||
Up to serial number 1029, | tunnel diode when a triggering event occurs. | ||
the 3B3 uses Transitron T12G germanium diodes (equivalent to the [[1N270]]) | |||
to protect the transistors of the front-end differential amplifier. | 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. | Starting at serial number 1030, silicon diodes were used for that function. | ||
==Specifications== | |||
[[Category:Specifications needed]] ''please add'' | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Image:3b3 front.jpg | Image:3b3 front.jpg | ||
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Image:3b3 left.jpg | Image:3b3 left.jpg | ||
</gallery> | </gallery> | ||
[[Category:560 series plugins]] |