Describes three-phase synchronous machines of 1 kVA rating and larger with frequency of not more than 400 Hz and not less than 15 Hz. Not intended to apply to special synchronous machines such as permanent-magnet field machines. While the tests also apply in general to brushless machines, certain variations do exist and special precautions should be taken. Covers terminology and methods of determination and description of the tests and determination of machine quantities from these tests.