概述D33-W型三相瓦特表是电动系双元件携带式指示电表,用来测量三相交流45-65HZ平衡或不平衡负载系统的有功功率用.GeneralModelD33-Wthree-phasewattmetersareportableelectrodynamicindicatinginstru-mentswithtwo-elementconstruction,offeringitformeasuringactivepoweronACthree-phasecircuitswiththefrequencyat45-65HZ.