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Zurich Instruments AG - Lock-In Amplifiers 4/24 LB
Photonics Dictionary

cathode

1. The negative electrode of a device in an electrical circuit. 2. The positive electrode of a primary cell or storage battery. 3. The primary source of electrons in an electron tube, serving as the filament in a directly heated electron tube, and in a coated metal configuration surrounding the heater in an indirectly heated one.
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