The core charge-exchange diagnostic at the Joint European Torus (JET) provides measurements of the impurity ion temperature Ti, toroidal velocity VΦ, and impurity ion densities nimp, across the whole minor radius. A contribution to the uncertainty of the measured quantities is the error resulting from the multi-Gaussian fit and photon statistics, usually quoted for each measured data. Absolute intensity calibration and especially alignment of the viewing directions can introduce an important systematic error. The technique adopted at JET to reduce this systematic contribution to the error is presented in this paper. The error in Ti, VΦ, and nimp is then discussed depending on their use.

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