Applies to three-phase synchronous machines of 1 kVA rating and larger with rated frequency of not more than 400 Hz and not less than 15 Hz. An appendix gives unconfirmed test methods for determining synchronous machine quantities.Notes:1 -Tests are not applicable to synchronous machines such as permanent magnet field machines, inductor type machines, etc.2 -They also apply to brushless machines, but certain variations exist and special precautions should be taken.