Electrical and optical measurements on hydrogenated Pd coated (20 nm) Dy films (250-300 nm) are presented. The films are prepared in a high vacuum chamber and hydrogenated, at room temperature, by exposing them to a hydrogen atmosphere. Maximum hydrogen concentration of the order of 3 is achieved as measured by QCM. Changes in electrical resistance and optical transmission (at λ=632.8 nm) in the films indicate the dielectric nature of the DyH 3 . The Hall coefficient measured also as a function of concentration, gives an insight into the evolution of the density of charge carriers as hydrogen is absorbed.