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3B4: Difference between revisions
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In the triggered modes, the [[tunnel diodes|tunnel diode]]-based triggering is rated to work to 20 MHz. | In the triggered modes, the [[tunnel diodes|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. | The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10 MHz, so 20 MHz is adequate. | ||
{{MissingSpecs}} | {{MissingSpecs}} | ||
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==Links== | ==Links== | ||
* [http://www.barrytech.com/tektronix/vintage/tek3b4.html Tek 3B4 @ barrytech.com] | * [http://www.barrytech.com/tektronix/vintage/tek3b4.html Tek 3B4 @ barrytech.com] | ||
{{Documents|Link=3B4}} | |||
==Internals== | |||
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. | |||
==Pictures== | ==Pictures== | ||