Method and apparatus for calibration of an electricity meter
AssigneeZellweger Luwa AG
InventorsBeat Manser, Roland Nussbaumer
Life of this patent
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Abstract
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.
Claims6
Apparatus for calibrating an electricity measuring circuit comprising:
- a housing having a socket for receiving a calibration system contact pin;
- a current sensor mounted within the housing;
- at least two connecting terminals for providing a supply of current to said current sensor;
- a voltage circuit for receiving current from at least one of said connecting terminals;
- a pivoting lever supported in said housing between said socket, said at least one connecting terminal and said voltage circuit, and having first and second operating positions, said first operating position of said pivoting lever establishing electrical contact between said at least one connecting terminal and said voltage circuit, and said second operating position of said pivoting lever establishing electrical contact between said calibration system contact pin inserted into said socket and said voltage circuit;
- and
- a rotating shaft about which said pivoting lever pivots when said calibration system contact pin is inserted into said socket, thereby pivoting said pivoting lever from said first operating position into said second operating position for electrically connecting said calibration system contact pin to said voltage circuit.
Dependencies are inferred from the claim text.