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The dielectric sensor using the sensitive capacitive-dependent crystal is described. In addition, the new idea of excitation of the entire dielectric sensor with stochastic test signals and the dielectric surface-measuring method are given. It includes the influence of test signals on the weighting function uncertainty and on the A/D-D/A conversion. The results of the water absorption measurement in glass-fiber resins are shown experimentally. The uncertainty of the surface dielectric measurement is less than 0.2% (T=15-25/spl deg/C).