Oscillograph
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| Top-Left: Duddell William Duddell William Du Bois Duddell was a British electro-physicist and electrical engineer. He was privately educated in the UK and France and rose quickly through the prestigious City & Guilds Schools via scholarships... moving-coil oscillograph with mirror in oil bath, Top-Middle: Rotating shutter and moving mirror assembly used with Duddell oscillograph, for placing time-index marks next to the waveform pattern. Top-Right: Moving-film camera for recording the waveform. Bottom: Film recording of sparking across switch contacts, as a high-voltage circuit is disconnected. |
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An oscillograph is an instrument for measuring alternating or varying electric current
Electric current
Electric current is a flow of electric charge through a medium.This charge is typically carried by moving electrons in a conductor such as wire...
in terms of current and voltage. There are two instruments that are in common use today:
- Electromagnetic oscillographElectromagnetic oscillographAn electromagnetic oscillograph is an oscillograph which measures variations of electric current by having it go through a magnetic coil. Variations in current induce momentum in the coil, which can be directly measured....
- Cathode-ray oscilloscopeOscilloscopeAn oscilloscope is a type of electronic test instrument that allows observation of constantly varying signal voltages, usually as a two-dimensional graph of one or more electrical potential differences using the vertical or 'Y' axis, plotted as a function of time,...