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{{Plugin Sidebar 2|
{{Plugin Sidebar
title=Tektronix 4S2 |
|manufacturer=Tektronix
summary=Dual channel sampling plugin |
|series=661
image=4s2 3.jpg |
|type=4S2  
caption=4S2 image needed - please add |
|summary=Dual channel sampling plugin  
series=[[661|661 Sampling Scope]] |
|image=4s2 3.jpg  
introduced=1963 |
|caption=4S2  
discontinued=(?) |
|introduced=1962
manuals=
|discontinued=(?)  
* [http://w140.com/tek_4s2a.pdf Tektronix 4S2A Manual (PDF)]
|designers=George Frye;
* [http://w140.com/tek_fcp/tek_type_4s2_factory_cal_proc.pdf Tektronix 4S2 Field Recalibration Procedure (PDF)]
|manuals=
* [http://w140.com/tek_fcp/tek_type_4s2_tentative_factory_cal_proc.pdf Tektronix 4S2 Factory Calibration Procedure (PDF)]
* [[Media:070-356.pdf|Tektronix 4S2 Manual]]
* [http://w140.com/tek_4s2a_eng_spec.pdf Tektronix 4S2A Engineering Spec (PDF)]
* [[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]].   
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. 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.  It has the disadvantage of making it impossible to see the leading edge of the triggering event unless a pre-trigger is used. 
Signals enter the 4S2 through [[GR-874 connector]]s on the front panel.  


The 4S2 uses a four-diode sampling bridge. The 4S2A uses a two-diode sampling bridge.   
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.
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]].
The 4S2A uses a [[152-0252-00]] snap-off diode to generate the sampling pulse.
{{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==
==Pictures==
===4S2===
<gallery>
<gallery>
File:4s2 3.jpg
Tek 4s2 front straight.jpg|4S2
File:4s2 2.jpg
4s2 3.jpg|4S2
File:4s2 1.jpg
4s2 2.jpg|4S2
File:4s2 4.jpg
4s2 1.jpg|4S2
File:Tek 4s2a sampler.png|42SA sampler schematic
4s2 4.jpg|4S2
File:Tek 4s2a pulse gen.png|42SA pulse generator schematic
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>
</gallery>
===4S2A===
<gallery>
Tek 4s2a front.jpg|4S2A Front
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>
==Components==
{{Parts|4S2}}
{{Parts|4S2A}}


[[Category:661 plugins]]
[[Category:661 plugins]]
[[Category:Sampling plugins]]
[[Category:Sampling plugins]]
[[Category:GR874]]

Latest revision as of 07:16, 19 August 2024

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. The 4S2A uses a 152-0252-00 snap-off diode to generate the sampling pulse.

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

4S2A

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 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
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