This invention relates to a liquid membrane type ion-selective electrode that can restrain an electric potential fluctuation of an inner electrode due to ultraviolet rays and that can conduct an analysis with high accuracy. However, this solution results in an undesirably high processing overhead in downlink receivers operating in a W-CDMA communications system. The secondary shaft is driven by the primary shaft in a rotational movement. CP and CQ are merged to compute C, which is then retrieved from the session memory. The programmable logic circuits can be configured to implement error generation and error monitoring functions that are tailored for any application. This is accomplished by a method and an arrangement in which a user-specific activity log is created so that data in the said log can be transmitted to the calling party before establishing the communications connection proper.