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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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it allows the output signal at one equivalent time instant to be processed in the time domain.   
it allows the output signal at one equivalent time instant to be processed in the time domain.   
For example, this allows the voltage to be low-pass filtered, so that it can be more accurately measured.   
For example, this allows the voltage to be low-pass filtered, so that it can be more accurately measured.   
The other reason why one might want a signal the consists of multiple sequential measurements  
The other reason why one might want a signal that consists of multiple sequential measurements  
of the same equivalent-time instant is that statistics can be calculated on these observations.   
of the same equivalent-time instant is that statistics can be calculated on these observations.   
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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