![]() ![]() ![]() V. K. Zworykin described a permanently sealed, high-vacuum cathode ray tube with a thermionic emitter in 1931. Early cathode ray tubes had been applied experimentally to laboratory measurements as early as the 1920s, but suffered from poor stability of the vacuum and the cathode emitters. The Braun tube, forerunner of the CRT, was known in 1897, and in 1899 Jonathan Zenneck equipped it with beam-forming plates and a magnetic field for deflecting the trace, and this formed the basis of the CRT. These gave valuable insights into high speed voltage changes, but had a very low frequency response, and were superseded by the oscilloscope which used a cathode ray tube (CRT) as its display element. ![]() Main article: History of the oscilloscopeĮarly high-speed visualisations of electrical voltages were made with an electro-mechanical oscillograph. Special-purpose oscilloscopes may be used to analyze an automotive ignition system or to display the waveform of the heartbeat as an electrocardiogram, for instance. General-purpose instruments are used for maintenance of electronic equipment and laboratory work. Oscilloscopes are used in the sciences, medicine, engineering, automotive and the telecommunications industry. Modern digital instruments may calculate and display these properties directly. Originally, calculation of these values required manually measuring the waveform against the scales built into the screen of the instrument. The displayed waveform can then be analyzed for properties such as amplitude, frequency, rise time, time interval, distortion, and others. The main purpose is capture information on electrical signals for debugging, analysis, or characterization. Modern digital oscilloscopes automatically set the measurement parameters and calculate/display the signal values automatically.Īn oscilloscope (informally scope or O-scope) is a type of electronic test instrument that graphically displays varying electrical voltages as a two-dimensional plot of one or more signals as a function of time. From the grid inherent to the screen together with the user-set parameters of the device shown at the upper display rim, the user may calculate the frequency and the voltage of the measured signal. Typical display of an analog oscilloscope measuring a sine wave signal with 10 kHz. ![]()
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