In the country were I live the mains electricity voltage is 230Vac. When I measure the mains voltage using an Uni-t UT52 multimeter, the multimeter measures about 247Vac. It is safe to power the oscilloscope (model GDS 1052 U) at this voltage (247Vac)? In the manual it is wrote that it can be powered at up to maximum 240Vac. Also in the manual it says "the power supply voltage should not fluctuate more than 10%".
It is safe to use the scope at 247Vac without any damage? The oscilloscope could be damaged in time (after a few years or months of use) because of the high mains voltage?