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The S-3 sampling head is a plug-in head for use with the  
{{Plugin Sidebar
7000 series sampling plug-ins or with the Type [[3S2]], [[3S5]], or [[3S6]] samplers.
|manufacturer=Tektronix
The plug-in includes a permanently attached 1x probe with the
|series=7000 and 3S series sampling heads
sampling bridge enclosed in the probe.
|type=S-3
|summary=Sampling Head
|image=S3a box front.jpg
|caption=S-3A head
|introduced=1969
|discontinued=1989
|manuals=
* [[Media:070-0765-00.pdf|Tektronix S-3 Manual]] (OCR)
* [[Media:Tek s-3 whole foldouts.pdf|Tektronix S-3 Manual Foldouts]] (whole, color)
* [[Media:Tek s-3 mod at sn b020120.pdf|Tektronix S-3 Modification at Serial Number B020120]]
* [[Media:070-1148-00.pdf|Tektronix S-3A Manual]] (070-1148-01 also exists)
}}
The '''Tektronix S-3 sampling head''' is a plug-in head for use with the 7000 series sampling plug-ins or the Type [[3S2]], [[3S5]], and [[3S6]] samplers.  


The input rise time is specified as less than 350ps for the 1x probe, less than 400ps with the optional 10x attenuator tip, and less than 500ps with the 100x attenuator tip.
The plug-in includes a permanently attached 1× probe with the sampling bridge enclosed in the probe.
The maximum operating signal voltage is 2Vp-p.
Optional 10× or 100× attenuator tips (010-0364-00, 010-0365-00) provide extended input voltage range; the optional [[VP-2]] voltage pickoff converts it to a 50 Ω feed-through sampling head.
The S-3 does not provide a trigger pickoff for internal triggering.
An offset voltage of either +/- 1V or +/- 2V can be selected via a toggle switch on the front panel.


{{BeginSpecs}}
{{Spec | Rise time | ≤350 ps (×10, ≤400 ps; ×100, ≤500 ps) }}
{{Spec | Input impedance | 100 kΩ // 2.3 pF (×10, 1 MΩ // 2 pF; ×100, 1 MΩ // 1.7 pF) }}
{{Spec | Maximum signal | 2 V<sub>p-p</sub> (×10, 20 V<sub>p-p</sub>; ×100, 200 V<sub>p-p</sub>) }}
{{Spec | Maximum safe input | max. ±100 V, max. sine input 20 V<sub>p-p</sub> (×10 or ×100, max. ±350 V, max. sine input 200 V<sub>p-p</sub>) }}
{{Spec | Features |
* no trigger pickoff for internal triggering
* offset voltage of either ±1 V or ±2 V (at ×1) can be selected via a toggle switch on the front panel
}}
{{EndSpecs}}


== Input Characteristics ==
==Links==
The probe tip input is equivalent to 100k resistor in parallel with about 2.3pF capacitance at low frequency.
{{Documents|Link=S-3}}
With the 10x or 100x attenuator tips, the probe input is equivalent to 1M paralleled with 2pF or 1.7pF, respectively.
{{PatentLinks|S-3}}


== Differences between S-3 and S-3A ==
==Differences between S-3 and S-3A ==
The S-3A sampling head has a 10x improvement in baseline shift due to cable flexing. All other specifications are identical to the ordinary S-3. The major differences in design involves the gate board in the box part of the probe, but some changes are also made to the circuits in the body of the probe.
The S-3A sampling head has a 10× improvement in baseline shift due to cable flexing.
All other specifications are identical to the ordinary S-3.


== Difference between the S-3 and the P6038 ==
The major differences in design involves the strobe board in the box part of the probe eliminating the snap-off diode and adding a common mode choke in the S-3A ,
The S-3 probe contains a compensated attenuator before the sampling bridge. The [[P6038]] does not.   
but some changes are also made to the circuits in the body of the probe.
The S-3 probe has a JFET buffer between the holding cap and the probe cable. The P6038 does not.
 
Both use the [[152-0368-00]] sampling bridge.
==Difference between the S-3 and the P6038 ==
The S-3 probe contains a compensated attenuator before the sampling bridge.
The [[P6038]] does not.   
The S-3 probe has a JFET buffer between the holding cap and the probe cable.
The P6038 does not.
Both use the [[152-0368-00]] sampling bridge.  The sampling pulse is generated by a [[snap-off diode]] ([[152-0368-00]]).


== Repair of Sampling Diodes ==
== Repair of Sampling Diodes ==
Individuals have reported success in replacing the S-3 sampling diodes with Agilent matched pair Schottky diodes.
Individuals have reported success in replacing the S-3 [[Sampling_diodes|sampling diodes]] with Agilent matched pair Schottky diodes.


* [http://bama.edebris.com/download/tek/s3/s3.djvu Tektronix S-3 Manual (DjVu)]
==Pictures==
* [http://w140.com/tek_s-3.pdf Tektronix S-3 Manual (PDF)]
'''S-3'''
<gallery>
Tek s3 probe sample bridge.jpg        | S-3 probe sampling bridge
Tek s3 sample bridge2.jpg            | S-3 probe sampling bridge
S3_frontend.png                      | S-3 schematic
010-0367-00 for P6038 S-3 chopper.jpg | [[010-0367-00]] 10X attenuator
</gallery>


'''S-3A'''
<gallery>
<gallery>
Image:S3_frontend.png
S3a box front.jpg                | Front
File:S3a attenuator.jpg|S-3A|S-3A attenuator
S3a probe external1.jpg         | S-3A probe
File:S3a box front.jpg
S3a attenuator.jpg               | 010-0364-00 ×10 attenuator for S-3A
File:S3a probe external1.jpg|S-3A probe
S3a probe internal1.jpg         | S-3A probe internal
File:S3a probe internal1.jpg|S-3A probe internal
S3a probe internal2.jpg         | S-3A probe internal
File:S3a probe internal2.jpg|S-3A probe internal
S3a strobe board.jpg             | S-3A strobe board
File:S3a strobe board.jpg|S-3A strobe board
S3a probe_internal_bothsides.jpg | S-3A probe both sides
File:S3a probe_internal_bothsides.jpg|S-3A probe both sides
S3A_schematic.jpg               | S-3A schematic
File:Tek s3 probe sample bridge.jpg|S-3 probe sampling bridge
Tek s-3a risetime.jpg           | S-3A showing 280 ps risetime when probing a 50 Ω impedance with no probe attenuators.
File:Tek s3 sample bridge2.jpg|S-3 probe sampling bridge
</gallery>
</gallery>
[[Category:7000 and 3S series sampling heads]]

Latest revision as of 07:27, 8 July 2024

Tektronix S-3
Sampling Head
S-3A head

Compatible with 7000 and 3S series sampling heads

Produced from 1969 to 1989

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix S-3 sampling head is a plug-in head for use with the 7000 series sampling plug-ins or the Type 3S2, 3S5, and 3S6 samplers.

The plug-in includes a permanently attached 1× probe with the sampling bridge enclosed in the probe. Optional 10× or 100× attenuator tips (010-0364-00, 010-0365-00) provide extended input voltage range; the optional VP-2 voltage pickoff converts it to a 50 Ω feed-through sampling head.

Key Specifications

Rise time ≤350 ps (×10, ≤400 ps; ×100, ≤500 ps)
Input impedance 100 kΩ // 2.3 pF (×10, 1 MΩ // 2 pF; ×100, 1 MΩ // 1.7 pF)
Maximum signal 2 Vp-p (×10, 20 Vp-p; ×100, 200 Vp-p)
Maximum safe input max. ±100 V, max. sine input 20 Vp-p (×10 or ×100, max. ±350 V, max. sine input 200 Vp-p)
Features
  • no trigger pickoff for internal triggering
  • offset voltage of either ±1 V or ±2 V (at ×1) can be selected via a toggle switch on the front panel

Links

Documents Referencing S-3

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

Differences between S-3 and S-3A

The S-3A sampling head has a 10× improvement in baseline shift due to cable flexing. All other specifications are identical to the ordinary S-3.

The major differences in design involves the strobe board in the box part of the probe eliminating the snap-off diode and adding a common mode choke in the S-3A , but some changes are also made to the circuits in the body of the probe.

Difference between the S-3 and the P6038

The S-3 probe contains a compensated attenuator before the sampling bridge. The P6038 does not. The S-3 probe has a JFET buffer between the holding cap and the probe cable. The P6038 does not. Both use the 152-0368-00 sampling bridge. The sampling pulse is generated by a snap-off diode (152-0368-00).

Repair of Sampling Diodes

Individuals have reported success in replacing the S-3 sampling diodes with Agilent matched pair Schottky diodes.

Pictures

S-3

  • S-3 probe sampling bridge

    S-3 probe sampling bridge

  • S-3 probe sampling bridge

    S-3 probe sampling bridge

  • S-3 schematic

    S-3 schematic

  • 010-0367-00 10X attenuator

    010-0367-00 10X attenuator

S-3A

  • Front

    Front

  • S-3A probe

    S-3A probe

  • 010-0364-00 ×10 attenuator for S-3A

    010-0364-00 ×10 attenuator for S-3A

  • S-3A probe internal

    S-3A probe internal

  • S-3A probe internal

    S-3A probe internal

  • S-3A strobe board

    S-3A strobe board

  • S-3A probe both sides

    S-3A probe both sides

  • S-3A schematic

    S-3A schematic

  • S-3A showing 280 ps risetime when probing a 50 Ω impedance with no probe attenuators.

    S-3A showing 280 ps risetime when probing a 50 Ω impedance with no probe attenuators.

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