Abstract: The invention relates to a device for measuring a rotor imbalance. Said device comprises a main shaft which is rotatably mounted in a machine housing and to which the rotor to be measured is fixed, a single-phase alternating-current motor for driving the main shaft, with a single-phase winding (4) and an auxiliary winding (5) which is offset in phase for driving the main shaft (1) up to measurement speed and a control device (17) that adjusts the current of the motor. Said control device (17) has an assembly (8, 6; 7; 20; 22, 23) which reduces the supply current delivered to the two windings (4, 5) of the motor (3; 21) once the measurement speed has been reached, in such a way that the motor creates a reduced torque which substantially compensates a speed drop produced by friction and drag.

Abstract: An electronic part having a plurality of substrates and a process for producing the same are disclosed, the electronic part comprising (1) a laminate comprising at least two previously fired substrates different in electrical characteristics each containing in the inside thereof a passive element, and an adhesive layer comprising glass which is interposed between said substrates, and (2) an outer electrode which is formed on the surface of the laminate of the substrates and is electrically connected to the passive elements, and the process comprising the steps of: separately firing at least two substrates different in electrical characteristics each containing in the inside thereof a passive element; adhering the substrates with an adhesive comprising glass; and forming an outer electrode on the surface of the laminate of the substrates in electrical connection to each passive element. Each substrate is free from warpage or cracking and containing no part remaining non-sintered.