DUSPOL緊湊型采用直流電壓進行極性試驗LEDdisplayshowsdirectandalternatingcurrentlevels12,24,50,120,230,400and750Vpolaritytestwithdirectvoltageidentifyingthephaseconductoragainsttheprotectiveconductor(PE)inalternatingvoltageloadapplicationtosuppressinductiveandcapacitivevoltageatIs 200mAVDEtestedaccordingtoDINEN/IEC61243-3