LeCroy Digital Oscilloscopes, Manual

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Processor — controls the entire system and performs
special monitoring and measurement functions
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Display System — translates stored data into a graphic
display of the signal.
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The character of your signals will determine the primary
specifications of the DSO you will want to use. While your DSO’s
secondary specifications will be determined by the demands of your
applications. In assessing the overall signal representation quality of
a digital oscilloscope, particular consideration needs to be given to
the cardinal parameters of bandwidth, sample rate, and
acquisition memory length.
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The bandwidth specification of a DSO indicates the ability of its front-
end amplifier to faithfully track an incoming signal. The DSO’s
bandwidth is defined as the frequency at which a sinusoidal input
signal has been attenuated to about 70 % of its real amplitude. This
point, at which the vertical amplitude error is about 30 %, is called the
–3 dB point. It is generally advisable to use an instrument whose