The early moving-magnet form of gal

The early moving-magnet form of galvanometer had the disadvantage that it was affected by any magnets or iron masses near it, and its deflection was not linearly proportional to the current. In 1882 Jacques-Arsène d'Arsonval and Marcel Deprez developed a form with a stationary permanent magnet and a moving coil of wire, suspended by fine wires which provided both an electrical connection to the coil and the restoring torque to return to the zero position. An iron tube between the magnet's pole pieces defined a circular gap through which the coil rotated. This gap produced a consistent, radial magnetic field across the coil, giving a linear response throughout the instrument's range. A mirror attached to the coil deflected a beam of light to indicate the coil position. The concentrated magnetic field and delicate suspension made these instruments sensitive; d'Arsonval's initial instrument could detect ten microamperes.[1]
Edward Weston extensively improved the design. He replaced the fine wire suspension with a pivot, and provided restoring torque and electrical connections through spiral springs rather like those in a wristwatch balance wheel. He developed a method of stabilizing the magnetic field of the permanent magnet, so that the instrument would have consistent accuracy over time. He replaced the light beam and mirror with a knife-edge pointer, which could be directly read; a mirror under the pointer and in the same plane as the scale eliminated parallax error in observation. To maintain the field strength, Weston's design used a very narrow slot in which the coil was mounted, with a minimal air-gap and soft iron pole pieces; this made the deflection of the instrument more linear with respect to coil current. Finally, the coil was wound on a light-former made of conductive metal, which acted as a damper. By 1888 Edward Weston had patented and brought out a commercial form of this instrument, which became a standard component in electrical equipment. It was known as the "portable" instrument because it was little affected by mounting position or by transporting it from place to place. This design is almost universally used in moving-coil meters today.

ผลลัพธ์ (อังกฤษ) 1:

the early moving-magnet form of galvanometer had the disadvantage that it was affected by any magnets or iron masses near it, and its deflection was not linearly proportional to the current. in 1882 jacques-arsène d'arsonval and marcel deprez developed a form with a stationary permanent magnet and a moving coil of wire,.a mirror attached to the coil deflected a beam of light to indicate the coil position. the concentrated magnetic field and delicate suspension made these instruments sensitive; d'arsonval's initial instrument could detect ten microamperes. [1]
edward weston extensively improved the design. he replaced the fine wire suspension with a pivot,.

ผลลัพธ์ (อังกฤษ) 3:

early The moving-magnet form of galvanometer had the disadvantage that it was affected by any magnets or iron masses near it, and its deflection was not linearly proportional to the current. In 1882 Jacques - Arse ne d'Arsonval Marcel Deprez developed a form and with a stationary permanent magnet and a coil of wire moving,suspended by fine wires which provided both an electrical connection to the coil and the restoring torque to return to the zero position. An iron tube between the magnet's pole pieces defined a gap through which the circular coil rotated. This gap produced a consistent, radial magnetic field across the coil, giving a linear response throughout the instrument's range.mirror A deflected a coil attached to the beam of light to indicate the coil position. The concentrated magnetic field and delicate suspension made these instruments sensitive; d'Arsonval' s initial instrument could detect ten microamperes. [ 1]
Edward Weston extensively improved the design. He replaced the fine wire suspension with a pivot,and provided restoring torque and electrical connections through spiral springs rather like those in a wristwatch balance wheel. He developed a method of stabilizing the magnetic field of the permanent magnet, so that the instrument would have consistent accuracy over time. He replaced the light beam and mirror with a knife-edge pointer, which could be read directly;a mirror under the pointer and in the same plane as the scale eliminated parallax error in observation. To maintain the field strength, Weston's design used a very narrow slot in which the coil was mounted, with a minimal air-gap and soft iron pole pieces; this made the more linear deflection of the instrument with respect to coil current. Finally,The coil was wound on a light-former made of conductive metal, which acted as a damper. By 1888 Edward Weston had patented and brought out a commercial form of this instrument, which became a standard component in electrical equipment. It was known as the "portable" instrument because it was little affected by mounting position or by transporting it from place to place.This design is almost universally used in moving-coil meters today.