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The S-1 [[sampling_oscilloscope|sampling]] plug-in head provides a single
{{Plugin Sidebar 2|
[[Connectors#GR-874|GR-874]] 50-ohm input with a 350ps rise-time.  
title=Tektronix S-1 |
The S-1 can be used with the 7000 series of sampling plug-ins,
summary=Sampling Head |
as well as the 3S series of sampling units.
image=S1-crop.jpg |
A trigger pickoff is provided for internal triggering,
caption=S-1 head |
and displayed noise is specified as less than 2mV.
introduced=1967 |
The S-1 accepts an input voltage range of -1V to +1V
discontinued=1989 |
with less than 1Vpp input signal amplitude.
series={{3S+7S}} |
 
manuals=
* [http://bama.edebris.com/download/tek/s1/s1.djvu Tektronix S-1 Manual (DjVu)]
* [http://bama.edebris.com/download/tek/s1/s1.djvu Tektronix S-1 Manual (DjVu)]
* [http://w140.com/tek_s1.pdf Tektronix S-1 Manual (PDF)]
* [http://w140.com/tek_s1.pdf Tektronix S-1 Manual (PDF)]
}}
The '''S-1 sampling plug-in head''' provides a single [[GR-874]] 50 Ω input with a 350 ps rise-time.
The S-1 can be used with the 7000 series of [[sampling_oscilloscope|sampling]] plug-ins, as well as the 3S series of sampling units.
{{BeginSpecs}}
{{Spec | Rise time | 350 ps }}
{{Spec | Bandwidth | 1 GHz }}
{{Spec | Input amplitude | −1 V to +1 V  with ≤1 V<sub>p-p</sub> signals }}
{{Spec | Maximum input  | ±5 V<sub>DC</sub> or sine of 10 V<sub>p-p</sub> up to 10 MHz }}
{{Spec | Input impedance | 50 Ω  ([[GR-874]]) }}
{{Spec | Noise  | < 2 mV }}
{{Spec | Features | trigger pickoff for internal triggering }}
{{EndSpecs}}
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/S-1.html S-1 page @ amplifier.cd]
==Internals==
The S-1 uses a two-diode sampling gate which has relatively high "kick-out" (leakage of the strobe signal out of the input). 
The manual cautions,
<blockquote>
Operating the sampling head without the input connector terminated by a 50 Ω resistor or coaxial
cable will cause a vertical shift of the zero signal baseline by a few millivolts. This is caused by the
strobe kickout signal being reflected from the open input connector, and arriving back at the sampling
bridge while the bridge is conducting.
</blockquote>
The sampling bridge strobe signal is generated by an [[avalanche transistor]] followed by a [[step recovery diode]].
==Pictures==


<gallery>
<gallery>
Image:Tek s-1.jpg
Tek s-1.jpg
Image:Tek s1 internal strobe.jpg|Strobe board
Tek s1 internal strobe.jpg | Strobe board
Image:Tek s1 internal pre.jpg|Preamp board
Tek s1 internal pre.jpg | Preamp board
Image:Tek s1 front.jpg
Tek s1 front.jpg | S-1 front
File:S1 diode.jpg
S1 diode.jpg   | Diode mount in S-1
File:S1 diode2.jpg
S1 diode2.jpg | Diode mount in S-1
File:S1 diode3.jpg
S1 diode3.jpg | Diode mount in S-1
File:S-52_s-1_rt.jpg
S-52_s-1_rt_brighter.jpg | S-1 in a [[3S2]] sampler / [[567]] scope
Tek s1 sampler schematic.png|Tektronix S-1 sampler
Tek 7s11 s-1.jpg|[[7S11]] with S-1
</gallery>
</gallery>
[[Category:7000 and 3S series sampling heads]]
[[Category:GR874]]
Gregor
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