This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionInverter output of an APC Smart-UPS SMT1500I.jpg
English: An oscillogram showing the inverter output of an APC Smart-UPS SMT1500I, recorded while this UPS was running off its batteries with a 0% load. Obviously, this confirms a true sine-wave nature of the output.
Taken with a UNI-T UT81B handheld digital oscilloscope.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.