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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 sampling bridge enclosed in the probe.
|series=7000 and 3S series sampling heads
|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]] (PDF) / [http://bama.edebris.com/download/tek/s3/s3.djvu @ BAMA] (DjVu)
* [[Media:070-1148-01.pdf|Tektronix S-3A Manual]] (PDF)
}}
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 350 ps for the 1× probe, less than 400 ps with the optional 10× attenuator tip, and less than 500 ps with the 100× 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 2 V<sub>p-p</sub>.
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 +/- 1 V or +/- 2 V can be selected via a toggle switch on the front panel.


== Input Characteristics ==
{{BeginSpecs}}
The probe tip input is equivalent to 100 kΩ resistor in parallel with about 2.3 pF capacitance at low frequency.  
{{Spec | Rise time | ≤350 ps (×10, ≤400 ps; ×100, ≤500 ps) }}
With the 10× or 100× attenuator tips, the probe input is equivalent to 1 MΩ paralleled with 2 pF or 1.7 pF, respectively.
{{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}}


== Differences between S-3 and S-3A ==
==Differences between S-3 and S-3A ==
The S-3A sampling head has a 10&times; 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 gate board in the box part of the probe,
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 frontend circuit
</gallery>


==Pictures==
'''S-3A'''
<gallery>
<gallery>
Image:S3_frontend.png
S3a attenuator.jpg|010-0364-00 ×10 attenuator for S-3A
File:S3a attenuator.jpg|S-3A|S-3A attenuator
S3a box front.jpg|Front
File:S3a box front.jpg
S3a probe external1.jpg|S-3A probe
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
File:Tek s3 probe sample bridge.jpg|S-3 probe sampling bridge
File:Tek s3 sample bridge2.jpg|S-3 probe sampling bridge
</gallery>
</gallery>


[[Category:7000 and 3S series sampling heads]]
[[Category:7000 and 3S series sampling heads]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/9534...74289"

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