DY30-1/DY30-2/DY30-3功能及技术指标 DY30-1 DY30-2 DY30-3 测定额定电压 250/500/1000V √ 500/1000/2500V √ 15/50/150V √ 电阻 2M/20M/200M/2000MΩ ±(3%＋2) 20M/200M/2000M/20GΩ ±(3%＋2) 2M/20M/200MΩ ±(3%＋2) 交流电压 700V ±(1.5%＋5) ±(1.5%＋5) ±(1.5%＋5