Abstract：In the improvement of excitation bedplate of ARL 3460 spark source atomic emission spectrometer, the mosaic driving washer method was used to form new work plane. The instrumental drift correction, type standard correction, precision test and accuracy test proved that the values of drift correction coefficients (α and β) were better than those before modification and close to 1.0. The relative standard deviations (RSD) were smaller than 3 %, and the analytical diviations were within the allowable deviation range of elements. The obtained data were compared for evaluation, which indicated that the proposed method was feasible and effective. The results could meet the analytical requirements. The modified excitation bedplate could be used instead of the new one.
