A method for forming a SiOC thin film includes the steps of: positioning a substrate in a reactive chamber; and supplying bis-trimethylsilylmethane as a source for silicon and carbon and an oxygen gas as a source for oxygen and performing a CVD process. The Hall sensor is arranged such that one face thereof is opposed to one face of the magnet. The method for sulphonylating a hydroxylated organic compound is characterised in that it consists in reacting said compound, with a sulphonylating agent, in the presence of a sufficient amount of a Lewis acid. Movement of the cable due to water current generates electric power that can be harvested and stored. Defective functional or sub-functional units can be detected after assembly, during power up, periodically during operation, andor manually.