题目内容
The general purpose oscilloscope is suitable for special-purpose applications.
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The general purpose oscilloscope is used in servicing communications, scientific, or industrial work where the frequency of the signal to be observed does not greatly exceed 1000 kHz.
The signal travels directly to the vertical deflection plates of the Cathode Ray Tube (CRT).
Voltage applied to these deflection plates causes a glowing dot to less.
A positive voltage causes the dot to move down while a negative voltage causes the dot to move up.
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