3B4: Difference between revisions
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| discontinued=(?) | | discontinued=(?) | ||
| manuals= | | manuals= | ||
* [[Media:070-431.pdf|Tektronix 3B4 Manual] | * [[Media:070-431.pdf|Tektronix 3B4 Manual]] (OCR) | ||
* [[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]] | ||
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==Internals== | ==Internals== | ||
Triggering is done with a [[TD3A]] 4.7 mA tunnel diode. | Triggering is done with a [[TD3A]]/1N3717 4.7 mA tunnel diode. | ||
The trigger input is amplified and buffered by a [[6DJ8]]-based differential amplifier driving a common-emitter | 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. | [[2N964]] germanium PNP transistor whose collector current switches the tunnel diode. | ||
Latest revision as of 16:59, 7 December 2023
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.
Key Specifications
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Internals
Triggering is done with a TD3A/1N3717 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
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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
