Development and implementation of series of precision wideband system oriented AC voltage multimeter
AC voltage measurement is the most common problem in electrical quantities measurement. The AC multimeters performance analysis shows that high accuracy is achieved in a narrow band of frequencies while there is a need to improve the accuracy not only in the sound but also in the short and in the ultrasonic frequency range. Therefore, element wise additive and multiplicative error correction technique to improve the accuracy was proposed. For this purpose, measurement channel is divided into functional blocks, each of which is complemented by a feedback circuit and aback up system.