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-The Tektronix Type 3S1 is a dual-trace sampling plug-in for 560-series scopes.  It has built-in sampling
+{{Plugin Sidebar
-heads with GR-874 connectors and 350ps risetime.  The 3S1 has internal trigger pick-off on both channels.
+|manufacturer=Tektronix
-The 3S1 is similar to the 4S1, but more compact.
+|series=560-series scopes
+|type=3S1
+|summary=1 GHz sampling plug-in
+|image=3s1_front.jpg
+|caption=Tektronix 3S1
+|introduced=1967
+|discontinued=(?)
+|designers=
+|manuals=
+* [[Media:070-0632-00.pdf|Tektronix 3S1 Manual]]
+* [[Media:late_3s1_schematics.pdf|Late 3S1 Schematics]]
+* [[Media:Tek 3s1 fcp june 1967.pdf|Tektronix 3S1 Factory Cal Procedure 1967]]
+* [[Media:Tek 3s1 cal outline.pdf|Tektronix 3S1 Calibration Outline]] (OCR)
+}}
+The '''Tektronix 3S1''' is a dual-trace [[sampling_oscilloscope|sampling]] plug-in for [[560-series scopes]].
-* http://bama.edebris.com/manuals/tek/3s1/
+In many ways, the 3S1 is similar to the [[4S1]], but more compact.
+The 3S1 provides [[probe power|+100 V and −12.2 V]] for [[P6032|P6032 cathode-follower probes]].
+{{BeginSpecs}}
+{{Spec | Rise Time | 350 ps}}
+{{Spec | Bandwidth | 1 GHz (calculated) }}
+{{EndSpecs}}
+==Links==
+{{Documents|Link=3S1}}
+{{PatentLinks|3S1}}
+==Internals==
+In contrast to modular sampling plug-ins like the [[3S2]], the 3S1 has built-in sampling heads.
+The signal enters through [[GR-874 connector]]s on the front panel.
+Each channel has a resistive trigger pickoff followed by a 55 ns coaxial [[delay line]].
+Following the delay line is a compensation circuit designed to (partially) undo the pulse degradation caused by the delay line, and also to provide proper termination for low return loss at the input.
+Next in the main signal path is a four-diode sampling bridge driven by a [[snap-off diode]], D73.
+==Pictures==
 <gallery>
-Image:3s1_front.jpg|front view
+s1_front.jpg|front view
-Image:3s1_left.jpg|left view
+s1_left.jpg|left view
-Image:3s1_right.jpg|right view
+s1_right.jpg|right view
-Image:3s1_top.jpg|top view
+s1_top.jpg|top view
-Image:3s1_bottom.jpg|bottom view
+s1_bottom.jpg|bottom view
 </gallery>
+==Components==
+{{Parts|3S1}}
+[[Category:Sampling plugins]]
+[[Category:560 series plugins]]
+[[Category:GR874]]