RE: Cathode Ray Oscilloscope
||Cathode Ray Oscilloscope
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An oscilloscope (abbreviated sometimes as scope or O-scope) is a type of electronic test instrument that allows signal voltages to be viewed, usually as a two-dimensional graph of one or more electrical potential differences (vertical axis) plotted as a function of time or of some other voltage (horizontal axis).
Cathode ray Tubes
Originally all oscilloscopes used cathode ray tubes as their display element and linear amplifiers for signal processing, but modern oscilloscopes can have LCD or LED screens, fast analog-to-digital converters and digital signal processors.
The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons) and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen.
Dual and multiple-trace oscilloscopes
Oscilloscopes with two vertical inputs, referred to as dual-trace 'scopes, are extremely useful and commonplace.
Some multi-trace 'scopes use the external trigger input as an optional vertical input, and some have third and fourth channels with only minimal controls.
Oscilloscopes are commonly used when it is desired to observe the exact wave shape of an electrical signal.
In addition to the amplitude of the signal, an oscilloscope can show distortion and measure frequency, time between two events (such as pulse width or pulse rise time), and relative timing of two related signals.
One of the advantages of a scope is that it can graphically show signals: where a voltmeter may show a totally unexpected voltage, a scope may reveal that the circuit is oscillating.
Digital electronics usually operate from a clock, so a dual-trace scope which shows both the clock signal and a test signal dependent upon the clock is useful.
Storage scopes are helpful for "capturing" rare electronic events that cause defective operation.