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{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Tektronix S-4 |
|manufacturer=Tektronix
summary=Sampling Head |
|series=7000 and 3S series sampling heads
image=s4-crop.jpg |
|type=S-4
caption=S-4 head |
|summary=Sampling Head
series=[[3S2]], [[7S11]], [[7S12]] Sampling Plugins |
|image=Tek-s-4.jpg
introduced=1968 |
|caption=S-4 head
discontinued=(?) |
|introduced=1968
manuals=
|discontinued=1990
* [http://w140.com/tek_s4.pdf Tektronix S-4 Manual, copyright 1969 (PDF)]
|designers=George Frye
* [http://w140.com/tek_S4_1985.pdf Tektronix S-4 Manual, revised 1985 (PDF)]
|manuals=
* [http://w140.com/frye_s4_gate.pdf George Frye's Explanation of S-4 sampler in October 1968 Service Scope (PDF)]
* [[Media:070-0896-00.pdf|Tektronix S-4 Manual 1969]] (OCR)
* [[Media:070-0896-01 march 1985.pdf|Tektronix S-4 Instruction Manual, Revised March 1985]] (OCR)
* [[Media:070-0896-01.pdf|Tektronix S-4 Instruction Manual, Revised October 1986]] (OCR)
* [[Media:Frye s4 gate.pdf|George Frye's Explanation of S-4 sampler in October 1968 Service Scope]]
* [[Media:Tek s-4 fcp april 1969 - OCR.pdf|Tektronix S-4 Factory Calibration Procedure, April 1969]] (OCR)
* [[Media:Tek s-4 eis signatures page.pdf|Tektronix S-4 Engineering Instrument Specification signatures page]]
}}
}}
The '''Tektronix S-4''' is a sampling head for 7000- and 3S-series samplers. It was designed by George Frye and [[introduced in 1968]]. It is the fastest of the S-series plug-in samplers. (An interesting comparison of different sampling heads is found in [http://www.picosecond.com/objects/AN-02a.pdf "AN-3042a, Revision 1, 2/89"].)
The '''Tektronix S-4''' is a sampling head for 7000- and 3S-series samplers.
It was designed by [[George Frye]] and [[introduced in 1968]].
It is the fastest of the S-series plug-in samplers.  


The S-4 sampling gate is based upon a traveling wave trapped-charge transmission line in which the sampling window is set by the propagation time of a pulse edge through a thick-film transmission line. This technique requires only a sharp pulse edge rather than a precise pulse width, which is harder to generate.
The sampling diodes are housed in a special coaxial connector that provides a high bandwidth signal path.
==Specifications==
{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Rise time | 25 ps }}
{{Spec | Rise time | 25 ps (35 ps observed with [[S-50]] or [[S-52]]) }}
{{Spec | Bandwidth |14.5 GHz }}
{{Spec | Bandwidth | 14.5 GHz }}
{{Spec | Input impedance | 50 Ω (terminated SMA port)}}
{{Spec | Input impedance | 50 Ω (terminated [[SMA connector]])}}
{{Spec | Input voltage | 1 V<sub>p-p</sub> (operating) }}
{{Spec | Maximum input | ±5 V max. non-destructive  }}
{{Spec | Noise | < 5 mV}}
{{Spec | Noise | < 5 mV}}
{{Spec | Features |
{{Spec | Features |
Line 27: Line 32:
}}
}}
{{EndSpecs}}
{{EndSpecs}}
==Internals==
The [[Sampler#Six-Diode_Sampler|S-4 sampling gate]] is based upon a traveling wave trapped-charge transmission line
in which the sampling window is set by the propagation time of a pulse edge through a thick-film transmission line.
This technique requires only a sharp pulse edge rather than a precise pulse width, which is harder to generate.
The sampling diodes are housed in a special coaxial connector that provides a high bandwidth signal path.
During the development of the S-4, the velocity gate theory was tested using
a length of transmission line between diodes.
This led to an aperture time that depended upon twice the propagation delay of the length of transmission line.
To disassemble the sampler hybrid, first remove it from the sampler board as per the manual.
Remove the input connector using a 7/32" wrench and remove the 20 dB attenuator with small pliers.
The ceramic board is held to the housing using roll pins that can be pressed out with a 0.030" pin punch.
The hybrid has six diodes, each about 0.75 mm².
The cathodes are glued to the gold substrate with conductive epoxy and the anodes
are wire-bonded (twice) over a gap to the next step in the strobe line.
It appears that a standard beam-lead diode may fit across the gap
but cleanly removing a failed diode without damaging the substrate would be quite difficult.
==Prices==
1979: $1,435 (~$6,000 in 2023 dollars)
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], annual sales were estimated at 150 units in 1979.


==Links==
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/S4.html S-4 page @ amplifier.cd]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/S4.html S-4 page @ amplifier.cd]
* [https://kh6htv.files.wordpress.com/2015/11/an-02a-oscopes.pdf James R. Andrews, ''Comparison of Ultra-Fast Rise Sampling Oscilloscopes''. Picosecond Pulse Labs App Note AN-2a, 1989]
{{Documents|Link=S-4}}
{{PatentLinks|S-4}}


==Pictures==
==Pictures==
<gallery>
<gallery>
Image:Tek s4.jpg
Tek-s-4.jpg
Image:S4_top.jpg|Top view of the S4 plug-in
Tek s4.jpg
Image:S4_left.jpg|Left view
S4_top.jpg | Top view of the S4 plug-in
Image:S4_right.jpg|Right view
S4_left.jpg | Left view
Image:S4 schem.png|Schematic
S4_right.jpg |Right view
S4 schem.png | Schematic
Tektronix-S4-sampler-board-strobe.jpg | Sampler board, strobe side
Tektronix-S4-sampler-board-preamp.jpg | Sampler board, preamp side
Tektronix-S4-sampler-board-hybrid.jpg | Sampler board, disassembled with parts orientation
Tektronix-S4-hybrid-internal.jpg | Microphotograph of sampler hybrid
S-4_B15_prototype.JPG | S-4 B-prototype, no difference to standard S-4
Tek s-4 in 7s11.jpg | S-4 in [[7S11]]
7s11-s4.jpg | S-4 in [[7S11]]
</gallery>
</gallery>


==Parts==
{{Parts|S-4}}


[[Category:7000 and 3S series sampling heads]]
[[Category:7000 and 3S series sampling heads]]

Latest revision as of 10:53, 19 June 2024

Tektronix S-4
Sampling Head
S-4 head

Compatible with 7000 and 3S series sampling heads

Produced from 1968 to 1990

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix S-4 is a sampling head for 7000- and 3S-series samplers. It was designed by George Frye and introduced in 1968. It is the fastest of the S-series plug-in samplers.

Key Specifications

Rise time 25 ps (35 ps observed with S-50 or S-52)
Bandwidth 14.5 GHz
Input impedance 50 Ω (terminated SMA connector)
Input voltage 1 Vp-p (operating)
Maximum input ±5 V max. non-destructive
Noise < 5 mV
Features
  • trigger signal pick-off for internal triggering

Internals

The S-4 sampling gate is based upon a traveling wave trapped-charge transmission line in which the sampling window is set by the propagation time of a pulse edge through a thick-film transmission line. This technique requires only a sharp pulse edge rather than a precise pulse width, which is harder to generate. The sampling diodes are housed in a special coaxial connector that provides a high bandwidth signal path.

During the development of the S-4, the velocity gate theory was tested using a length of transmission line between diodes. This led to an aperture time that depended upon twice the propagation delay of the length of transmission line.

To disassemble the sampler hybrid, first remove it from the sampler board as per the manual. Remove the input connector using a 7/32" wrench and remove the 20 dB attenuator with small pliers. The ceramic board is held to the housing using roll pins that can be pressed out with a 0.030" pin punch.

The hybrid has six diodes, each about 0.75 mm². The cathodes are glued to the gold substrate with conductive epoxy and the anodes are wire-bonded (twice) over a gap to the next step in the strobe line. It appears that a standard beam-lead diode may fit across the gap but cleanly removing a failed diode without damaging the substrate would be quite difficult.

Prices

1979: $1,435 (~$6,000 in 2023 dollars)

According to an internal memo, annual sales were estimated at 150 units in 1979.

Links

Documents Referencing S-4

Document Class Title Authors Year Links
Service Scope 53 Dec 1968.pdf Article Digital Systems Come Of Age John Bowne 1968 3T5 • 3T6 • 3S5 • 3S6 • S-1 • S-2 • S-3 • S-4 • 568 • 230
Service scope dec 1968 ocr.pdf Article Digital Systems Come of Age John Bowne 1968 3T5 • 3T6 • 3S5 • 3S6 • S-1 • S-2 • S-3 • S-4 • 568 • 230 • 240 • 241 • 250
Service Scope 52 Oct 1968.pdf Article The State of the Art in Sampling Al Zimmerman 1968 S-1 • S-2 • S-3 • S-4 • S-50 • S-51 • 285 • 3S1 • 3S2 • 3S5 • 3S6 • 3T2 • 3T5 • 3T6 • 3T77A • 568 • 230
Service Scope 52 Oct 1968.pdf Article A New Approach to Fast Gate Design George Frye 1968 S-4
42W-5850.pdf Application Note Preventing Sampling Head Overdrive and Static Damage Gary Mott 1985 Sampling • S-1 • S-2 • S-3A • S-4 • S-5 • S-6

Patents that may apply to S-4

Page Title Inventors Filing date Grant date Links
Patent US 3629731A Sampling system George Frye 1968-07-12 1971-12-21 Sampling • S-4 • S-6

Pictures

  • Top view of the S4 plug-in

    Top view of the S4 plug-in

  • Left view

    Left view

  • Right view

    Right view

  • Schematic

    Schematic

  • Sampler board, strobe side

    Sampler board, strobe side

  • Sampler board, preamp side

    Sampler board, preamp side

  • Sampler board, disassembled with parts orientation

    Sampler board, disassembled with parts orientation

  • Microphotograph of sampler hybrid

    Microphotograph of sampler hybrid

  • S-4 B-prototype, no difference to standard S-4

    S-4 B-prototype, no difference to standard S-4

  • S-4 in 7S11

    S-4 in 7S11

  • S-4 in 7S11

    S-4 in 7S11

Parts

Some Parts Used in the S-4

Part Part Number(s) Class Description Used in
152-0335-00 152-0335-00 Discrete component step recovery diode S-4 • S-6
152-0335-01 152-0335-01 Discrete component 150 ps step recovery diode 1502 • S-2 • S-4 • S-6
155-0001-00 155-0001-00 Hybrid integrated circuit gate assembly S-4
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