Research of the Improved Method of Nonlinear Reserved Arithmetic Applied in the Measurement of Dielectric Loss
Feng Xiaohua · Gao dianya jishu · 2005
In the digital measurement of dielectric loss, the m ea surement accuracy will be influenced by leakage error because of the fluctuation of the system frequency. The higher-order sine fitting algorithm takes the pow er frequency as an unknown parameter and use a nonlinear least squares fitting p rocedure based on a higher-order model to process the sampling data. So the met hod solves the problem of the asynchronous sampling, but the main obstacle of ap plications with this method is the contradiction between accuracy and rate when solving the nonlinear equations. This paper firstly applies the improved method of nonlinear term reserved arithmetic to the digital measurement of dielectric l oss angle and successfully solves the antinomy. Experiments show that the maximu m measurement error is limited to 0.000 3, but it takes less than 10 ms for one calculation. At the same time, it can measure the power frequency in real time s o it can give a new way to sample synchronously.