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The Tektronix 3S76 is a dual-trace [[sampling oscilloscope|sampling]] plug-in | {{Plugin Sidebar | ||
for [[560-series scopes]]. The | |manufacturer=Tektronix | ||
has a trigger takeoff transformer and a | |series=560-series scopes | ||
|type=3S76 | |||
|summary=Dual Channel Sampling plug-in | |||
|image=Tek 3s76 front.jpg | |||
|caption=Tektronix 3S76 Front | |||
|designers=Cliff Moulton; Ron Olson; Charlie Rhodes; Walt Lowy; Phil Crosby | |||
|introduced=1962 | |||
|discontinued=(?) | |||
|manuals= | |||
* [[Media:070-332.pdf|Tektronix 3S76 Manual]] | |||
* [[Media:Tek_3s76_schematics.pdf|Tektronix 3S76 Schematics]] | |||
* [[Media:Tek 3s76 cal outline.pdf|Tektronix 3S76 Calibration Outline]] (OCR) | |||
}} | |||
The '''Tektronix 3S76''' is a dual-trace [[sampling oscilloscope|sampling]] plug-in for [[560-series scopes]]. | |||
The inputs have 50 Ω impedance and use [[GR-874 connector]]s. Rise time is rated at less than 0.4 ns. | |||
The initial design work on the 3S76 was done by [[Cliff Moulton]]. | |||
It was called the Type 76, later renamed 3S76 before going into production. | |||
A decision was made to demonstrate the 76/3S76 at the 1961 IRE show. | |||
This created a panic because the plug-in was not complete. | |||
The 76 project landed in the TV group. | |||
[[Ron Olson]] and [[Charlie Rhodes]] were designing it and [[Walt Lowy]] was a technician. | |||
[[Phil Crosby]] worked on it for a week during spring break from Portland State (college then, not university). | |||
Phil Crosby designed the channel switching circuitry. | |||
{{BeginSpecs}} | |||
{{Spec | Rise time | < 400 ps }} | |||
{{Spec | Bandwidth | 875 MHz }} | |||
{{Spec | Input impedance | 50 Ω }} | |||
{{Spec | Triggering | Internal trigger take-off, 55 ns delay line }} | |||
{{EndSpecs}} | |||
Early 3S76 units are marked ''RT. ≈ 0.4 nSEC'' on the front panel. | |||
Later 3S76 units are marked ''RT. ≤ 0.4 nSEC'' on the front panel. | |||
==Internals== | |||
The 3S76 contains 10 Germanium transistors in TO-7 cases, which are prone to failure due to internal growth of tin whiskers. See the '''Repairs''' tab about replacing these with 2N3906s. | |||
Each input has a trigger takeoff transformer and a 55 ns coaxial [[delay line]]. | |||
The trigger source channel is selectable. | |||
Each delay line terminates at that channel's sampling bridge, | Each delay line terminates at that channel's sampling bridge, | ||
which is a four-diode design using beam-lead GaAs diodes. | which is a four-diode design using [[Sampling_diodes|beam-lead GaAs diodes]]. | ||
A [[7586]] nuvistor buffers the output of each sampling bridge. | A [[7586]] nuvistor buffers the output of each sampling bridge. | ||
The sampling pulse, common to both channels, | The sampling pulse, common to both channels, is generated by a [[152-115]] [[snap-off diode]] | ||
is generated by a snap-off diode | and a 3 cm twisted-pair clipping line. | ||
and a | |||
==Pictures== | |||
<gallery> | |||
Tek 3s76 front.jpg| 3S76 Front | |||
Tek 3s76 right.jpg| 3S76 Right Side | |||
Tek 3s76 bottom.jpg| 3S76 Bottom | |||
Tek 3s76 left.jpg| 3S76 Left Side | |||
Tek 3s76 top.jpg| 3S76 Top | |||
Tek 3s76 sampling bridge.jpg| 3S76 Sampling Bridge | |||
Tek 3s76 sampler.png|Sampler Schematic | |||
Tek 3s76 fb.jpg | 3S76 Lower Front | |||
Tek 3s76 early.jpg|Early 3S76, SN 000815 | |||
</gallery> | |||
==Components== | |||
{{Parts|3S76}} | |||
[[Category:Sampling plugins]] | |||
[[Category:560 series plugins]] | |||