3B4: Difference between revisions
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manufacturer=Tektronix |series=560-series scopes |type= 3B4 | | |||
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image=3b4_front.jpg| | image=3b4_front.jpg| | ||
caption=3B4 front view | | caption=3B4 front view | | ||
Revision as of 12:32, 14 August 2021
The Tektronix Type 3B4 is a timebase plug-in for 560-series scopes. It was 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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Links
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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top view
