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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?

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  • \$\begingroup\$ Most likley yes. Is your scope marked 220-240 Vac or 230 Vac? \$\endgroup\$ – winny Feb 13 '18 at 9:38
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    \$\begingroup\$ 10% over 240V is 264V, so 247V is well within spec. \$\endgroup\$ – DiBosco Feb 13 '18 at 9:41
  • \$\begingroup\$ In the manual of the scope it says: AC input voltage: 100-240Vac, 47-63Hz. \$\endgroup\$ – mike_mike Feb 13 '18 at 9:43
  • \$\begingroup\$ Then it's designed and tested for 264 Vac as per international standards. No problems. \$\endgroup\$ – winny Feb 13 '18 at 9:44
  • \$\begingroup\$ the multimeter measures about 247Vac. Since you're using a meter that's not a true RMS meter, you have to take that 247V AC with a pinch of salt, the true RMS value of the voltage is likely to be smaller. The 240 V AC rating on the scope is RMS because mains voltage is specified with the RMS value. \$\endgroup\$ – Bimpelrekkie Feb 13 '18 at 10:07
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That should be absolutely fine to use. Most of the time, a cheap digital multimeter will never give you great readings on AC voltage, but as the scope says it can fluctuate up to 10%, then you really shouldn't worry, it will be able to handle AC voltage up to 264V.

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