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3T77: Difference between revisions
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|discontinued=1973 | |discontinued=1973 | ||
|manuals= | |manuals= | ||
* [[Media:070-333.pdf | Tektronix 3T77 Manual]] | * [[Media:070-333.pdf | Tektronix 3T77 Manual with 3T77A-related Appendix]] | ||
* 3T77A manual 070-0546-00 needed | |||
<small> | <small> | ||
'''Modifications''' | '''Modifications''' | ||
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'''Calibration''' | '''Calibration''' | ||
* [[Media:Tek 3t77 cal outline.pdf | Tektronix 3T77 Calibration Outline]] (OCR) | * [[Media:Tek 3t77 cal outline.pdf | Tektronix 3T77 Calibration Outline]] (OCR) | ||
}} | }} | ||
The '''Tektronix 3T77''' is a [[sampling_oscilloscope | sampling]] sweep plug-in for [[560-series scopes]]. | The '''Tektronix 3T77''' is a [[sampling_oscilloscope | sampling]] sweep plug-in for [[560-series scopes]]. | ||
It was [[introduced in 1962]], along with the [[567]] and [[3S76]]. | It was [[introduced in 1962]], along with the [[567]] and [[3S76]]. | ||
[[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the Type [[77]] | [[Bob Webb]] and maybe [[Jim Geddes]] and possibly [[Cliff Moulton]] designed the a plug-in called "Type 77" (not to be confused with the identically named but totally different non-sampling sweep plug-in also called [[77|Type 77]]). The "Type 77" sampling sweep 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. | ||
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In normal mode, an internal ramp generator produces the control voltage, repeatedly redrawing the trace on the CRT. | In normal mode, an internal ramp generator produces the control voltage, repeatedly redrawing the trace on the CRT. | ||
In single sweep mode, the internal ramp generator is started by a button on the front panel, makes one horizontal trace, and then waits for the button to be pressed again. | In single sweep mode, the internal ramp generator is started by a button on the front panel, makes one horizontal trace, and then waits for the button to be pressed again. | ||
{{MissingSpecs}} | |||
==Internals== | ==Internals== | ||
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===Difference of 3T77 and 3T77A=== | ===Difference of 3T77 and 3T77A=== | ||
TIME POSITION knob instead DELAY knob, with more range of delay by slow sweep rate | TIME POSITION knob instead of a DELAY knob, with more range of delay by slow sweep rate. | ||
The RECOVERY TIME knob can be pulled for HF-sync. | |||
==Pictures== | ==Pictures== | ||
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</gallery> | </gallery> | ||
== | ==Components== | ||
{{Parts|3T77}} | {{Parts|3T77}} | ||
{{Parts|3T77A}} | {{Parts|3T77A}} | ||