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The 1S1 is a [[sampling oscilloscope|sampling]] plug-in for [[500-series scopes]]. 
{{Plugin Sidebar
It is essentially one channel of a sampling unit and a timing unit from a [[661]]. 
|manufacturer=Tektronix
It has its own trigger and timebase.
|series=500-series scopes  
The oscilloscope's timebase is usually set to a relatively slow sweep rate when using a 1S1. 
|type=1S1
Alternatively, the sweep on the oscilloscope can be free-run,
|summary=Sampling system
and the horizontal voltage from the oscilloscope can be used to control the 1S1, as described below.
|image=Tek 1s1 front2.jpeg
The 1S1 has a 50-Ohm [[Connectors#GR-874|GR-874]] connector for signal input.
|caption=1S1 front view
The plug-in supplies power (+100V and -12.6V) to active probes such as the [[P6032]] cathode follower probe. 
|introduced=1965
|discontinued=1974
|designers=Gene Cowan;Chuck Edgar
|manuals=
* [[Media:070-0475-00.pdf|Tektronix 1S1 Manual]] (retouched)
* [https://bama.edebris.com/download/tek/1s1/1s1.djvu Tektronix 1S1 Manual] (DjVu @ BAMA)
* [https://w140.com/1s1.pdf Tektronix 1S1 Manual]
* [[Media:tek_1s1_field_training_package.pdf|Tektronix 1S1 Field Training Package]] (OCR)


* [[1S1/Repairs|David Wise 1S1 Repair Notes]]
}}
The '''Tektronix 1S1''' is a [[sampling oscilloscope|sampling]] plug-in for [[500-series scopes]], designed by [[Gene Cowan]] (vertical) and [[Chuck Edgar]] (horizontal), [[introduced in 1965]] and sold through 1973.
It is essentially one channel of a sampling unit and a timing unit from a [[661]].  It has its own trigger and timebase. 
The oscilloscope's timebase is usually set to a relatively slow sweep rate when using a 1S1.  Alternatively, the sweep on the oscilloscope can free-run, and the horizontal voltage from the oscilloscope can be used to control the 1S1, as described below.
The 1S1 has a 50 Ω [[GR-874 connector]] for the signal input.  The plug-in supplies power
(+100 V and −12.6 V) to accessories like the [[P6032]] Cathode Follower Probe, the
[[281|281 TDR Pulser]], and the [[282|Type 282 Probe Adapter]], which is an active buffer
to allow the use of high-impedance probes with the 50 Ω input of the 1S1 (at reduced bandwidth).
{{MissingSpecs}}
==Operation==
The 1S1 can operate in normal self-swept mode or an external sweep signal can be applied to the 1S1.   
The 1S1 can operate in normal self-swept mode or an external sweep signal can be applied to the 1S1.   
With the 1S1's internal sweep disabled, the horizontal-in and vertical-out connections can be used  
With the 1S1's internal sweep disabled, the horizontal-in and vertical-out connections can be used  
so the the 1S1 acts as a lookup table, a mapping of x to y, a function.   
so the 1S1 acts as a lookup table, a mapping of X to Y, a function.   
The 661 also has this capability, in its "A vert/B horiz" mode, which is like X-Y mode for a sampler.   
The 661 also has this capability, in its "A vert/B horiz" mode, which is like X-Y mode for a sampler.   
In this mode, the horizontal-in voltage controls to the time after the trigger event when the sample should be taken,  
In this mode, the horizontal-in voltage controls the time after the trigger event when the sample should be taken,  
and the vertical-out voltage corresponds to the voltage measured at that instant.   
and the vertical-out voltage corresponds to the voltage measured at that instant.   
This allows a waveform to be digitized using an arbitrarily slow DAC to generate the horizontal voltage  
This allows a waveform to be digitized using an arbitrarily slow DAC to generate the horizontal voltage  
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For example, one might want to know, when testing a logic gate, what is the propagation delay  
For example, one might want to know, when testing a logic gate, what is the propagation delay  
such that 99.9% of the transitions happen faster than this.   
such that 99.9% of the transitions happen faster than this.   
The horizontal-in voltage can also be produced, in "manual" mode, by setting a knob on the 1S1.
The horizontal-in voltage can also be produced, in "manual" mode, by setting a knob on the 1S1.


The sampler in the 1S1 is quite different from the sampler in the [[1S2]].  The 1S1 uses a four-diode
When the 1S1 is set for INT trigger signal, the EXT TRIG input is terminated with 50 Ω.
sampling bridge, terminated within the 1S1.  The 1S2 uses a two-diode feed-through sampler, typical for
TDR instruments.


Type 1S1 was [[introduced in 1965]] and sold through 1973.
==Internals==
The sampler in the 1S1 is quite different from the sampler in the [[1S2]].  The 1S1 uses a [[sampling diodes|four-diode]] sampling bridge, terminated within the 1S1.  The 1S2 uses a two-diode feed-through sampler, typical for TDR instruments.


* [http://bama.edebris.com/download/tek/1s1/1s1.djvu Tektronix 1S1 Manual (DjVu)]
The 1S1 uses two type [[8416]] tubes, the 12V version of the [[6DJ8]].
* [http://w140.com/1s1.pdf Tektronix 1S1 Manual (PDF)]
 
==Pictures==


<gallery>
<gallery>
Image:Tek 1s1.jpg|front view
Tek 1s1 bottom2.jpeg ‎
Image:1s1 block.jpg|block diagram
Tek 1s1 front2.jpeg ‎
Tek 1s1 left2.jpeg ‎
Tek 1s1 rear3.jpeg ‎
Tek 1s1 right2.jpeg ‎
Tek 1s1 top2.jpeg
Tek 1s1.jpg|Front view
Tek_1S1_Iso.jpeg | 1S1
Tek_1S1_Front.jpeg | Front
1s1 front details.JPG | Front
Tek_1S1_RHS.jpeg | LHS
Tek_1S1_LHS.jpeg | RHS
Tek_1S1_Top.jpeg | Top
Tek_1S1_Bottom.jpeg | Bottom
1s1 front.jpg
1s1 left.jpg
1s1 right.jpg
Tek 1s1 rear.jpg|Rear
Tek 1s1 rear2.jpg|Rear
Tek_1S1_Delayline.jpeg | Delay Line
1s1 block.jpg|block diagram
1S1_in_535A.png| 1S1 in operation
</gallery>
</gallery>
==Components==
{{Parts|1S1}}
[[Category:500 series sampling plugins]]
[[Category:GR874]]
Carbone
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