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3T77: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Sampling sweep plug-in | | |series=560-series scopes | ||
image=Tek 3t77 front. | |type=3T77 | ||
caption=Tektronix 3T77 | |summary=Sampling sweep plug-in | ||
|image=Tek 3t77 front.jpeg | |||
introduced=1962 | | |caption=Tektronix 3T77 Front | ||
discontinued=1973 | | |designers=Bob Webb; Jim Geddes; Cliff Moulton | ||
manuals= | |introduced=1962 | ||
* [ | |discontinued=1973 | ||
* [ | |manuals= | ||
* [[Media:070-333.pdf | Tektronix 3T77 Manual with 3T77A-related Appendix]] | |||
* 3T77A manual 070-0546-00 needed | |||
<small> | |||
'''Modifications''' | |||
* [[Media:050-0419-00.pdf|Replacement of 152-0074-00 Tunnel Diode with 152-0381-00]] | |||
'''Calibration''' | |||
* [[Media:Tek 3t77 cal outline.pdf | Tektronix 3T77 Calibration Outline]] (OCR) | |||
}} | }} | ||
The '''Tektronix 3T77''' is a [[sampling_oscilloscope|sampling]] | The '''Tektronix 3T77''' is a [[sampling_oscilloscope | sampling]] sweep plug-in for [[560-series scopes]]. | ||
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 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 | 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. | |||
== | 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. | ||
This voltage determines the X-position of the spot on the CRT and, correspondingly, the delay from the trigger event to the sampling point. | |||
Manual mode is the same as external sweep mode, but the control voltage is generated internally based on the position of a potentiometer on the front panel of the 3T77. | |||
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. | |||
{{MissingSpecs}} | |||
==Internals== | |||
While still tube-based, the 3T77 uses [[2N976]] transistors and [[1N3129]] [[tunnel diodes]]. | |||
It uses a [[6688]] tube in the staircase generator circuit, and an RCA [[7586]] nuvistor as a ramp-current generator. | |||
The 3T77 mixes "classic" chassis/[[ceramic strip]] construction with the trigger circuit built on a PCB. | |||
===Difference of 3T77 and 3T77A=== | |||
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== | ||
====3T77 Photos==== | |||
<gallery> | |||
Tek 3t77 front.JPG|3T77 Front | |||
3t77 1.jpg|3T77 | |||
3t77 2.jpg|3T77 | |||
3t77 3.jpg|3T77 | |||
3t77 4.jpg|3T77 | |||
3t77 5.jpg|3T77 | |||
3t77 6.jpg|3T77 | |||
3t77 7.jpg|3T77 | |||
3t77 8.jpg|3T77 | |||
3t77 9.jpg|3T77 | |||
</gallery> | |||
====3T77 Schematics==== | |||
<gallery> | |||
3t77 trigger schem.png | Trigger Schematic | |||
3t77 block diagram.png | Block Diagram | |||
3t77 connector and ps schem.png | Connector and Power Supply | |||
3t77 horizontal amp schem.png | Horizontal Amp Schematic | |||
3t77 staircase schem.png | Staircase Schematic | |||
3t77 fast ramp schem.png | Fast Ramp Schematic | |||
</gallery> | |||
====3T77A Photos==== | |||
<gallery> | <gallery> | ||
Tek 3t77a front.jpeg | 3T77A Front | |||
Tek 3t77a left.jpg | 3T77A Left | |||
Tek 3t77a right.jpg | 3T77A Right | |||
3t77a trig.jpg | 3T77A Trigger Board | |||
Tek 3t77a triggerboard.jpg | 3T77A Trigger Board | |||
Tek 3t77a top.jpg | 3T77A Top | |||
Tek 3t77a rear.jpg | 3T77A Rear | |||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|3T77}} | |||
{{Parts|3T77A}} | |||
[[Category:Sampling plugins]] | [[Category:Sampling plugins]] | ||
[[Category:560 series plugins]] | [[Category:560 series plugins]] | ||