Tektronix was heavily involved with designing digital sampling oscilloscopes.
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It's somewhat analagous to building your own effective-time sampling oscilloscope.
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Very high speed test equipment, especially sampling oscilloscopes, may also use discrete DACs.
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Sampling oscilloscopes achieve their large bandwidths by not taking the entire signal at a time.
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Digital storage also makes possible another type of oscilloscope, the equivalent-time sample oscilloscope.
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A hand held oscilloscope is usually a digital sampling oscilloscope, using a liquid crystal display for its display.
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The first sampling oscilloscope was an analog instrument, originally developed as a front-end unit for a conventional oscilloscope.
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Digital oscilloscopes can be classified into three primary categories : digital storage oscilloscopes, digital phosphor oscilloscopes, and digital sampling oscilloscopes.
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These are produced for electronic sampling oscilloscopes, but also used for frequency comparison of microwaves, because they reach up to 1 THz.
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A sampling oscilloscope can display signals of considerably higher frequency than the sampling rate if the signals are exactly, or nearly, repetitive.