二手TYPE2558交流电压标准源万用表校准仪横河仪器二手TYPE2558交流电压标准源万用表校准仪交流电压电流标准2558厂商:日本横河ACVOLTAGECURRENTSTANDARD-100mV,1-1000Vin6ranges;100mA,1-50Ain4ranges-Frequencyranges50,60,400Hzor40-500Hzcontinuouslyvariable-Overvoltageandovercurrentprotection-Sweepmode-Deviationreadout-Outputdivider0-15)