you need
  • Multimeter
  • 2 wire probes
Guide
1
Before measuring voltage network insert the black wire from the probe into the socket labeled the COM multimeterthen insert the red lead into the socket with the inscription VΩmA.Turn on the device by turning the switch and putting it in the position of the voltage measurement.
2
Please note that the multimeter has two modes of voltage measurement: DC voltage measurement mode and the mode of the AC voltage.Turn the multimeter to measure AC voltage, AC volt
age measurement sector is represented by the symbol ACV.Put the switch with the numbers 750, located in the sector.This figure marked the limit of the measured voltages with a multimeter for the position of the switch.The display unit should see three digits "zero" and the icon «HV», showing that enabled measurement of high voltages.If this icon is not check, as the set mode dial and set correctly.
3
for voltage measurement probes take the one to the right and one to his left hand.Probes must be taken above the restrictive rings located on the probes.Do not take the test leads in one hand.Insert the test leads into the outlet and the display will determine voltage .Indications are subject to change within 3 - 4 units, that's fine.
4
significant change in voltage can be caused by repetitive heavy load in the network .Check whether your neighbor with any powerful tool, it does not produce any electric welding on the site.
5
Otherwise, call an electrician to check the reliability of contacts and connecting terminals in your home or apartment.Do not attempt to determine the cause of instability, tension in your home.Remember amateur changes in the wiring can result in an accident or fire.