3S76: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Dual Channel Sampling plug-in | | |series=560-series scopes | ||
image=Tek 3s76 front.jpg | | |type=3S76 | ||
caption=Tektronix 3S76 | |summary=Dual Channel Sampling plug-in | ||
|image=Tek 3s76 front.jpg | |||
introduced=1962 | | |caption=Tektronix 3S76 Front | ||
discontinued=(?) | | |designers=Cliff Moulton; Ron Olson; Charlie Rhodes; Walt Lowy; Phil Crosby | ||
manuals= | |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 '''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 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}} | {{BeginSpecs}} | ||
| Line 22: | Line 32: | ||
{{Spec | Triggering | Internal trigger take-off, 55 ns delay line }} | {{Spec | Triggering | Internal trigger take-off, 55 ns delay line }} | ||
{{EndSpecs}} | {{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== | ==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]]. | Each input has a trigger takeoff transformer and a 55 ns coaxial [[delay line]]. | ||
The trigger source channel is selectable. | The trigger source channel is selectable. | ||
| Line 31: | Line 46: | ||
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, is generated by a [[snap-off diode]] | The sampling pulse, common to both channels, is generated by a [[152-115]] [[snap-off diode]] | ||
and a 3 cm twisted-pair clipping line. | and a 3 cm twisted-pair clipping line. | ||
| Line 37: | Line 52: | ||
<gallery> | <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> | </gallery> | ||
==Components== | |||
{{Parts|3S76}} | |||
[[Category:Sampling plugins]] | [[Category:Sampling plugins]] | ||
[[Category:560 series plugins]] | [[Category:560 series plugins]] | ||
Latest revision as of 15:37, 8 May 2024
The Tektronix 3S76 is a dual-trace sampling plug-in for 560-series scopes. The inputs have 50 Ω impedance and use GR-874 connectors. 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.
Key Specifications
| Rise time | < 400 ps |
|---|---|
| Bandwidth | 875 MHz |
| Input impedance | 50 Ω |
| Triggering | Internal trigger take-off, 55 ns delay line |
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, which is a four-diode design using beam-lead GaAs diodes.
A 7586 nuvistor buffers the output of each sampling bridge. The sampling pulse, common to both channels, is generated by a 152-115 snap-off diode and a 3 cm twisted-pair clipping line.
Pictures
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3S76 Front
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3S76 Right Side
-
3S76 Bottom
-
3S76 Left Side
-
3S76 Top
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3S76 Sampling Bridge
-
Sampler Schematic
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3S76 Lower Front
-
Early 3S76, SN 000815
Components
Some Parts Used in the 3S76
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 152-115 | 152-115 • 152-0115-00 | Discrete component | step recovery diode | 3S3 • 3S76 |
| 2N1516 | 151-015 | Discrete component | Germanium PNP transistor | 3S76 |
| 2N2207 | 151-063 • 151-0063-00 | Discrete component | germanium PNP transistor | 3B1 • 3B3 • 3S76 • 321A • 547 |
| 6922 | 154-0195-00 | Vacuum Tube (Dual Triode) | dual triode | 3S76 • 4S2 |
| 6CW4 | 154-0323-00 | Vacuum Tube (Triode) | Nuvistor triode | 1A7 • 3A8 • 3B2 • 3S76 • 6R1 • 565 • S-311 |
| 6DJ8 | 154-0187-00 • 154-0305-00 | Vacuum Tube (Dual Triode) | dual triode | 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4 |
| 7308 | 154-0371-00 | Vacuum Tube (Dual Triode) | dual triode | 3S76 • 3S3 • 4S1 • 4S2A • 4S3 • S-311 |
| 7586 | 154-0306-00 | Vacuum Tube (Triode) | Nuvistor triode | M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311 |
| RT5204 | 151-0058-00 | Discrete component | Silicon NPN transistor | 565 • RM565 • Z • 2A61 • 3B1 • 3B3 • 3S76 • 3T77 |
| ZZ1000 | 154-370 • 154-0370-00 | Gas Discharge Tube (Voltage regulator) | 81 V voltage reference | 129 • 3B1 • 3B1S • 3B2 • 3B3 • 3S76 • 422 • S-311 |