I need your advice on current measurement. My problem is that I need to measure the current VERY VERY precisely. This is AC current whose magnitude will be between 50-100A. I thought that a clip-on ammeter would be sufficient but its accuracy is about +-20% due to poor calibration. I have well calibrated shunt resistor but its rating is only 5A. But I need to have at least 50 Amps in the circuit. I do not have the means to recalibrate the clip-on ammeter and frankly speaking an not sure how since I do not have a well-calibrated current source. At this point of time, I am running out ideas and was wondering if anybody can steer me in the right direction or inform me of a usual techniques that may be employed in the cases such as mine.
Edgar Lobachevskiy Physics Dept University of Hawaii PH: 808-956-2949 FAX: 808-956-7107