| 摘要 |
In a solid state electricity meter, a display (16) consisting of a number of juxtaposed display elements provides, in a vector form, an indication of the direction and range of power flow in the line being measured. Circuitry for driving the vector display comprises a first memory storing a plurality of power measurement references and a second memory storing corresponding vector symbols. A microprocessor (50) compares each power measurement with the references stored in the first memory to determine the range of the power measurement and, in response, reads the corresponding vector symbol from the second memory to drive the display (16). |
