Цифровой трехфазный вольтметр

general Tree-phase voltmeter with high cost-effective featurecan measure three-phase voltage of electric power grid ,and be programmable to setratio through panel keys. main features measurement: three-phase voltage display mode: three-line LED simultanously displayA,B,C three-phase voltage extension: the meter needs to be equiped with transfermor while above 500V optional function:RS485communication interface,transmission output(DC4-20mA,DC0-20mA)and upper and lower limit alarm function advantage -Truly effective value measurement,four-bit display -Alarm control fuction(upper limit and low limit)for users to elect -Communication fuction, communication adress, baud rate for for users to select -Three-line LED simultanously display A,B and C three- phase voltage or current -Calibration by software, high precision, free calibration in long-term work -Programmable to adjust display value 1 9999 at random through panel keys technical parameters inputinputvoltage 500V(special can be made to order) displayLED4-bit,display data&update time 1S current 5A,1A(special can be made to order) display0 9999 overloadlast1.2times accuracy class0.5% instantaneous; voltage2times/s,current10times/s isolation and resist pressure2KV/50Hz/1min extensionequiped with transformer or shunt to extend range insulation resistance≥100MΩ frequency50Hz±10% mean time to free-failure≥9000h power supplyvoltageAC 220V±10%(special can be made to order) working conditionenvironment temperature -25 55°c power consumption≤3W humidity≤93% non-corrosive gas sites