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3B3: Difference between revisions
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The Tektronix Type 3B3 is sweep unit [[introduced in 1963]], intended for use with the 561A. | The Tektronix Type 3B3 is sweep unit [[introduced in 1963]], intended for use with the [[561|561A]]. | ||
It works fine in other 560-series scopes. | It works fine in other [[560-series scopes]]. | ||
It provides a calibrated delay from 500 nsec to 10 seconds after the trigger event, before | It provides a calibrated delay from 500 nsec to 10 seconds 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 2mA germanium tunnel diode. The trigger source is buffered by | Triggering is done using a 2mA germanium [[tunnel diodes|tunnel diode]]. The trigger source is buffered by | ||
a 7895 Nuvistor triode cathode-follower driving a differential amplifier formed by two | 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 | [[2N2207]] germanium PNP transistors. The collector current switches the tunnel diode when | ||
a triggering event occurs. | a triggering event occurs. | ||
* [http://bama.edebris.com/download/tek/3b3/3b3.djvu Tektronix 3B3 Manual (DjVu)] | |||
* [http://w140.com/3b3.pdf Tektronix 3B3 Manual (PDF)] | |||
<gallery> | <gallery> | ||