| Abstract |
The use of inverters with high switching frequency and power, causes problems of measuring the power and efficiency, because of the resulting EMI and high order harmonics. A measuring system is described, which meets these requirements. Inverter input/output current i(t) and voltage v(t) are measured by a coaxial shunt and a voltage probe. The signals are amplified, digitized and transmitted via an optical link to a signal processing unit by small measuring transducers, supplied from batteries. All necessary computations are done by the signal processor and the results are displayed on a PC-screen. This concept combines velocity and noise immunity by moving intelligence from the transducer to the data processing unit. An error analysis is included. |
