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The Tektronix 4S2 is a two-channel [[sampling oscilloscope|sampling]] vertical plug-in for the [[661]].   
{{Plugin Sidebar
Signals enter the 4S2 through [[Connectors#GR-874|GR-874 connectors]] on the front panel.
|manufacturer=Tektronix
Unlike the [[4S1]], the 4S2's signal path does not contain a delay line between the input
|series=661
connector and the sampler.  This has the advantage of maintaining higher pulse fidelity and thus higher bandwidth. 
|type=4S2
It has the disadvantage of making it impossible to see the leading
|summary=Dual channel sampling plugin
edge of the triggering event unless a pre-trigger is used.  Each channel has a two-diode sampler.
|image=4s2 3.jpg
|caption=4S2
|introduced=1962
|discontinued=(?)
|designers=George Frye;
|manuals=
* [[Media:070-356.pdf|Tektronix 4S2 Manual]]
* [[Media:070-0536-00.pdf|Tektronix 4S2A Manual]]
'''Calibration'''
* [[Media:Tek 4s2 cal outline.pdf|Tektronix 4S2 Calibration Outline]] (OCR)
* [https://w140.com/tek_fcp/tek_type_4s2_factory_cal_proc.pdf Tektronix 4S2 Field Recalibration Procedure]
* [https://w140.com/tek_fcp/tek_type_4s2_tentative_factory_cal_proc.pdf Tektronix 4S2 Factory Calibration Procedure]
* [[Media:tek_4s2a_eng_spec.pdf|Tektronix 4S2A Engineering Spec]] (OCR)
}}
The '''Tektronix 4S2''' is a two-channel [[sampling oscilloscope|sampling]] vertical plug-in for the [[661]].   
Signals enter the 4S2 through [[GR-874 connector]]s on the front panel.  


* [http://w140.com/tek_4s2a.pdf Tektronix 4S2A Manual (PDF)]
Unlike the [[4S1]], the 4S2's signal path does not contain a [[delay line]] between the input connector and the sampler.
This has the advantage of maintaining higher pulse fidelity and thus higher bandwidth, but the disadvantage of making it impossible to see the leading edge of the triggering event unless a pre-trigger is used.


The 4S2, which was designed in 1962, uses a four-diode sampling bridge.
The 4S2A, designed in 1965, uses a two-diode sampling bridge. 
This design change is discussed in the 4S2A Engineering Spec document linked below.
The 4S2 does not provide trigger pick-off. The 4S2A provides trigger pick-off for channel A.
The 4S2 and 4S2A front panels look the same, but they use different GR-874 input connectors.
The 4S2 uses a short airline unique to the 4S2.
The 4S2A uses the connector-to-board system described in [[Patent US 3426311A|US Patent 3,426,311]] and has some parts in common with the [[3T7]].
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 3.9 GHz }}
{{Spec | Rise time | 90 ps }}
{{Spec | Deflection |  2 mV/Div to 200 mV/Div, 1−2−5  }}
{{EndSpecs}}
==See Also==
* [[4S2 Pulser]]
==Pictures==
===4S2===
<gallery>
Tek 4s2 front straight.jpg|4S2
4s2 3.jpg|4S2
4s2 2.jpg|4S2
4s2 1.jpg|4S2
4s2 4.jpg|4S2
Tek 4s2 avalanche pulse components.jpg|4S2 Pulse Generator
Tek 4s2 avalanche pulse1.jpg|4S2 Pulse Generator
Tek 4s2 avalanche pulse2.jpg|4S2 Pulse Generator
Tek 4s2 avalanche pulse4.jpg|4S2 Pulse Generator
Tek 4s2 sampler.jpg|4S2 Sampler
Tek 4s2 sampler2.jpg|4S2 Sampler
Tek 4s2 ac amplifier outside.jpg|AC Amplifier
Tek 4s2 ac amplifier components.jpg|AC Amplifier
Tek 4s2 memory outside.jpg|Memory
Tek 4s2 memory components.jpg|Memory
Tek 4s2 inverter outside.jpg|Inverter
Tek 4s2 inverter components.jpg|Inverter
Tek 4s2 dual-trace outside.jpg|Dual Trace
Tek 4s2 dual-trace components.jpg|Dual Trace
Tek 4s2 left front inside.jpg|4S2
Tek 4s2 input connector.jpg|4S2
Tek 4s2 front right wiring.jpg|4S2
Tek 4s2 front 32.jpg|4S2
Tek 4s2 front bottom.jpg|4S2
Tek 4s2 bottom wiring.jpg|4S2
Tek 4s2 samplers.jpg|4S2 Samplers
Tek 4s2 top cards.jpg|4S2 Top
Tek 4s2 top front.jpg|4S2 Top Front
Tek 4s2 top.jpg|4S2 Top
Tek 4S2 var pots and pulse generator connections.jpg|Pulse Generator Card Removed, Var Gain Pots
Tek 4s2 rear.jpg|4S2 Rear
</gallery>
===4S2A===
<gallery>
<gallery>
Image:Tek 4s2a sampler.png|42SA sampler schematic
Tek 4s2a front.jpg|4S2A Front
Image:Tek 4s2a pulse gen.png|42SA pulse generator schematic
Tek 4s2a sampler.png|42SA sampler schematic
Tek 4s2a pulse gen.png|42SA pulse generator schematic
Tek 4s2a pulse generator front.jpg|4S2A Pulse Generator Front
Tek 4s2a pulse generator rear.jpg|4S2A Pulse Generator Rear
Tek 4s2a gate board 2.jpg|4S2A Gate (Sampler) Board
Tek 4s2a gate board.jpg
Tek 661 4s2a 5t3 s-52.jpg|4S2A step response driven by [[S-52]]. 100 ps/div.
</gallery>
</gallery>
==Components==
{{Parts|4S2}}
{{Parts|4S2A}}
[[Category:661 plugins]]
[[Category:Sampling plugins]]
[[Category:GR874]]

Latest revision as of 09:21, 9 December 2023

Tektronix 4S2
Dual channel sampling plugin
4S2

Compatible with 661

Produced from 1962 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 4S2 is a two-channel sampling vertical plug-in for the 661. Signals enter the 4S2 through GR-874 connectors on the front panel.

Unlike the 4S1, the 4S2's signal path does not contain a delay line between the input connector and the sampler. This has the advantage of maintaining higher pulse fidelity and thus higher bandwidth, but the disadvantage of making it impossible to see the leading edge of the triggering event unless a pre-trigger is used.

The 4S2, which was designed in 1962, uses a four-diode sampling bridge. The 4S2A, designed in 1965, uses a two-diode sampling bridge. This design change is discussed in the 4S2A Engineering Spec document linked below. The 4S2 does not provide trigger pick-off. The 4S2A provides trigger pick-off for channel A.

The 4S2 and 4S2A front panels look the same, but they use different GR-874 input connectors. The 4S2 uses a short airline unique to the 4S2. The 4S2A uses the connector-to-board system described in US Patent 3,426,311 and has some parts in common with the 3T7.

Key Specifications

Bandwidth DC to 3.9 GHz
Rise time 90 ps
Deflection 2 mV/Div to 200 mV/Div, 1−2−5

See Also

Pictures

4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2 Pulse Generator

    4S2 Pulse Generator

  • 4S2 Pulse Generator

    4S2 Pulse Generator

  • 4S2 Pulse Generator

    4S2 Pulse Generator

  • 4S2 Pulse Generator

    4S2 Pulse Generator

  • 4S2 Sampler

    4S2 Sampler

  • 4S2 Sampler

    4S2 Sampler

  • AC Amplifier

    AC Amplifier

  • AC Amplifier

    AC Amplifier

  • Memory

    Memory

  • Memory

    Memory

  • Inverter

    Inverter

  • Inverter

    Inverter

  • Dual Trace

    Dual Trace

  • Dual Trace

    Dual Trace

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2

    4S2

  • 4S2 Samplers

    4S2 Samplers

  • 4S2 Top

    4S2 Top

  • 4S2 Top Front

    4S2 Top Front

  • 4S2 Top

    4S2 Top

  • Pulse Generator Card Removed, Var Gain Pots

    Pulse Generator Card Removed, Var Gain Pots

  • 4S2 Rear

    4S2 Rear

4S2A

  • 4S2A Front

    4S2A Front

  • 42SA sampler schematic

    42SA sampler schematic

  • 42SA pulse generator schematic

    42SA pulse generator schematic

  • 4S2A Pulse Generator Front

    4S2A Pulse Generator Front

  • 4S2A Pulse Generator Rear

    4S2A Pulse Generator Rear

  • 4S2A Gate (Sampler) Board

    4S2A Gate (Sampler) Board

  • 4S2A step response driven by S-52. 100 ps/div.

    4S2A step response driven by S-52. 100 ps/div.

Components

Some Parts Used in the 4S2

Part Part Number(s) Class Description Used in
120-0304-00 120-0304-00 Discrete component inductor 4S1 • 4S2
152-112 152-112 • 152-0112-00 Discrete component step recovery diode 4S2
6922 154-0195-00 Vacuum Tube (Dual Triode) dual triode 3S76 • 4S2
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 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
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


Some Parts Used in the 4S2A

Part Part Number(s) Class Description Used in
152-0252-00 152-0252-00 Discrete component Tek-made step recovery diode 4S2A
6688 154-0215-00 Vacuum Tube (Pentode) miniature high-slope VHF/UHF pentode P80 • 3T77 • 3T77A • 4S2A • 526 • TR-4602
7308 154-0371-00 Vacuum Tube (Dual Triode) dual triode 3S76 • 3S3 • 4S1 • 4S2A • 4S3 • S-311
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