Undervoltage:% and time Voltage Dips:%, Phase and time Frequency Variations:Ramp, Frequency and Time Aeronautical Grid:up to 400Hz Voltage Harmonics:up to 15th Harmonic Flicker:Ramp, Amplitude, Frequency and Time Voltage Sags:%, Phase and time User interface:Modbus TCP/IP HMI:Local Touchscreen PC:Windows 7 application Show More