1S1: Difference between revisions

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(wikifed repair notes text file to 1S1/Repairs page)
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title=Tektronix 1S1|
title=Tektronix 1S1|
summary=Sampling system|
summary=Sampling system|
image=Tek_1S1_Front.jpeg |  
image=1s1 front details.JPG |  
caption=1S1 front view|
caption=1S1 front view|
introduced=1965 |
introduced=1965 |
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* [[1S1/Repairs|David Wise 1S1 Repair Notes]]
* [[1S1/Repairs|David Wise 1S1 Repair Notes]]
}}
}}
The '''Tektronix 1S1''' is a [[sampling oscilloscope|sampling]] plug-in for [[500-series scopes]].
The '''Tektronix 1S1''' is a [[sampling oscilloscope|sampling]] plug-in for [[500-series scopes]], designed by [[Chuck Edgar]], [[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.   
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 be free-run,  
The oscilloscope's timebase is usually set to a relatively slow sweep rate when using a 1S1.  Alternatively, the sweep  
and the horizontal voltage from the oscilloscope can be used to control the 1S1, as described below.  
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 signal input.  The plug-in supplies power (+100 V and −12.6 V) to accessories like the [[P6032]] Cathode Follower Probe, the [[281]] TDR Pulser, and the [[282]] Probe Adapter.
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]] 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  
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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.


When the 1S1 is set for INT trigger signal, the EXT TRIG input is terminated with 50 Ω.
==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.
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.
Type 1S1 was designed by [[Chuck Edgar]], [[introduced in 1965]] and sold through 1973.
The [[282|Type 282 Probe Adapter]] works with the 1S1.
It is an active buffer to allow the use of high impedance probes with the 50 Ω input of the 1S1.
It does, however, lower the bandwidth.
When the 1S1 is set for INT trigger signal, the EXT TRIG input is terminated with 50 Ω.


==Pictures==
==Pictures==

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