DUSPOL紧凑型采用直流电压进行极性试验LEDdisplayshowsdirectandalternatingcurrentlevels12,24,50,120,230,400and750Vpolaritytestwithdirectvoltageidentifyingthephaseconductoragainsttheprotectiveconductor(PE)inalternatingvoltageloadapplicationtosuppressinductiveandcapacitivevoltageatIs 200mAVDEtestedaccordingtoDINEN/IEC61243-3