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3T77: Difference between revisions
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add intro date for 3T77A
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[[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the Type [[77]], which evolved into the 3T77. | [[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the Type [[77]], which evolved into the 3T77. | ||
The '''Tektronix 3T77A''' made its first appearance in the 1966 catalog. | |||
Both versions trigger on either the internal trigger pick-off from the vertical plug-in or from an external trigger signal input. | |||
Triggering is faster and more sensitive with an external input. | Triggering is faster and more sensitive with an external input. | ||
The 3T77 can operate in any of four modes: external sweep, manual sweep, normal, or single sweep. | The 3T77/3T77A can operate in any of four modes: external sweep, manual sweep, normal, or single sweep. | ||
In external sweep mode, an external control voltage is applied to a BNC connector on the front panel of the 3T77. | In external sweep mode, an external control voltage is applied to a BNC connector on the front panel of the 3T77. | ||
This voltage determines the X-position of the spot on the CRT and, correspondingly, the delay from the trigger event to the sampling point. | This voltage determines the X-position of the spot on the CRT and, correspondingly, the delay from the trigger event to the sampling point. | ||