Frequency Changers (also known as converters or inverters) Frequency changers, other than those specified in entries 0B001.b.13 or 3A225 of Annex 1, having all of the following characteristics, and specially designed software therefore: i. Multiphase frequency output; ii. Capable of providing a power of 40 W or greater; and iii. Capable of operating anywhere (at any one point or more) within the frequency range of between 600 and 2 000 Hz. Technical Notes: (1) Frequency changers are also known as converters or inverters. (2) The functionality specified above may be met by certain equipment described or marketed as electronic test equipment, AC power supplies, variable speed motor drives, or variable frequency drives.