Galvanometer, Edspot

A highly sensitive apparatus for measuring very small charges (of the order of μC) and currents (of the order of μA) and as null point detector. It has an integral taut suspension movement, lamp unit and scale, the indication being presented as a hairline in a brilliant light spot on a translucent screen. The range switch ebles the instrument sensitivity to be adjusted in convenient steps, whilst retaining critical damping conditions and presenting constant resistance at the instrument termils. Provision for effectively damping any transverse suspension vibrations, without affecting the electrical characteristics of the instrument. Sigl input through 4mm colour coded socket termils, with input circuit protected against accidental inputs of high magnitude. The front scale graduated in millimeters from 0-18cm (left zero) and 9-0-9cm (center zero), for reading as required. With Lock/Unlock, zero adjustment and sensitivity adjustment at the front. Range attenuation – sensitivities of x1, x0.1, x0.01 and x0.001, related to both current and voltage sensitivities with constant input resistance. Operates on 220-240C AC mains, 50/60Hz.