Zellweger Luwa Ag

Zellweger Uster Ag

Roland Nussbaumer

Beat Manser

A meter provides an arrangement for the optional connection of its voltage circuit to a current path or to a calibration system. The arrangement includes an opening, provided in the housing of the meter for inserting a contact device connected to the calibration system, and a pivoting lever. On insertion of the contact device into the opening, the pivoting lever can be moved from an operating position, connecting the voltage circuit to the current path, into a calibration position connecting the voltage circuit to the calibration system. Consequently, the arrangement can be changed over between the operating position and the calibration position with a minimum possible cost.

Method and apparatus for calibration of an electricity meter

The converter contains a number of electronic elements (3, 5, 7, 8, 9) and cooling elements (2), which are all mounted on a common holding plate (1) designed as a holding component. The holding plate (1) comprises the necessary electrical connections (10, 11, 14) and can be connected via plugs (10, 11, 14) to a base plate mounted in the corresponding device. Owing to this modular structure, the converter can easily be adapted to varying types of power without the need for structural modifications. The converter is economic to produce and to test and is also extremely convenient to use and to maintain. Also disclosed is ripple control transmitter apparatus in which such converters are used for frequency changing and are arranged for convenient use and good cooling.

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Uster, Switzerland

Roland Nussbaumer