This change provides revised text for Section 16.0 – Power 
Input, Section 18.0 – Audio Frequency Conducted Susceptibility –
 Power Inputs and Appendix A – Environment Test 
Identification.Section 16 – Power Input This section provides 
test modifications to address the issues of harmonic distortion 
and variable frequency AC buses.  The revised power test 
requirements include: Requirements for variable frequency 
systems similar to constant frequency systems. Added 
designation H for equipment that is tested for current harmonic 
emission. Deletion of Category E equipment. Introduction of 
requirements for normal frequency transients.Revision of 
existing tables and addition of new tables for current harmonic 
emissions.Section 18 – Audio Frequency Conducted 
Susceptibility – Power Inputs This section provides revisions 
to ensure harmony with the changes to Section 16 and 
consistency with the sweep speed testing procedures in Section 
20.Appendix A – Environment Test Identification This section 
provides revisions to ensure harmony with the changes to 
Sections 16 and 18.