3B4: Difference between revisions
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* [http://bama.edebris.com/download/tek/3b4/3b4.djvu Tektronix 3B4 Manual (DjVu) | * [[Media:070-431.pdf|Tektronix 3B4 Manual]] (PDF) | ||
* [http://bama.edebris.com/download/tek/3b4/3b4.djvu Tektronix 3B4 Manual @ BAMA] (DjVu) | |||
* [[Media:Tek 3b4 fcp jan 1969.pdf|Tektronix 3B4 Factory Calibration Procedure, January 1969]] | * [[Media:Tek 3b4 fcp jan 1969.pdf|Tektronix 3B4 Factory Calibration Procedure, January 1969]] | ||
* [[Media:Tek 3b4 fcp june 1967.pdf|Tektronix 3B4 Factory Calibration Procedure, June 1967]] | * [[Media:Tek 3b4 fcp june 1967.pdf|Tektronix 3B4 Factory Calibration Procedure, June 1967]] | ||
}} | }} | ||
The '''Tektronix Type 3B4''' is a timebase plug-in for [[560-series scopes]] | The '''Tektronix Type 3B4''' is a timebase plug-in for [[560-series scopes]], introduced in 1964. | ||
It was intended primarily for use with the [[561A]], but works fine in other 560-series scopes. | It was intended primarily for use with the [[561A]], but works fine in other 560-series scopes. | ||
Revision as of 12:39, 20 August 2021
The Tektronix Type 3B4 is a timebase plug-in for 560-series scopes, introduced in 1964.
It was intended primarily for use with the 561A, but works fine in other 560-series scopes. The 3B4 is unusual in having an explicit "FREE RUN" mode.
In the triggered modes, the tunnel diode-based triggering is rated to work to 20 MHz. The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10 MHz, so 20 MHz is adequate.
Triggering is done with a TD3A 4.7 mA tunnel diode. The trigger input is amplified and buffered by a 6DJ8-based differential amplifier driving a common-emitter 2N964 germanium PNP transistor whose collector current switches the tunnel diode.
The 283 Real Time adapter enables real-time sweeps with a 3B4.
Key Specifications
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Pictures
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front view
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left side view
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right side view
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