3B3: Difference between revisions
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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 | ||
| Line 22: | Line 39: | ||
Image:3b3 left.jpg | Image:3b3 left.jpg | ||
</gallery> | </gallery> | ||
[[Category:560 series plugins]] | |||
Revision as of 04:02, 27 June 2014
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.
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.
Specifications
please add
