S-311
The Tektronix Type S-311 Programmable Dual-Trace Sampling Plug-In Unit is a 560-series plug-in designed for use with the Tektronix S2000 and S3000 Series Systems.
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Front view. Low photo quality makes it impossible to discern the perimeter of the faceplate. It is standard 560-series size.
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Right view.
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Left view.
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Rear view.