The laboratory can provide calibration for 50 or 60 hz single - phase power factor meters with measuring range from zero to unity , leading or lagging 功率因数表本所可为频率为50或60hz而测量量程由零至一超前或滞后的单相功率因数表提供校正服务。
Direct acting indicating analogue electrical measuring instruments and their accessories part 5 : special requirements for phase meters , power factor meters and synchroscopes 直接动作指示模拟电气测量仪器及其附件.第5部分:相位表功率因数表和同步示波器的特殊要求
Direct acting indicating analogue electrical measuring instruments and their accessories . part 5 : special requirements for phase meters , power factor meters and synchroscopes 直接作用模拟指示电测量仪表及其附件第5部分:相位表功率因数表和同步指示器的特殊要求