This instrument is a high efficiency power source that provides a low distortion sine wave output with either a single or three-phase conf iguration. All power systems are constructed from a 4 500L-M power source. The following table lists the model number of each power system, the output phase configuration, the number of 4500L,s in the system and the output VA per phase. The table also shows that increased power is available at a reduced operating temperature of 35°C. MODEL PHASE #UNITS VA/PHASE 50°C 35 °C 4500L-3M 3 1 1500 1667 4500L-1M 1 1 4500 5000 9000L-3M 3 2 3000 3333 9000L-1M 1 2 9000 10000 13 500L-3M 3 3 4500 5000 13500L-1M 1 3 13500 15000 27000L-3M 3 6 9000 10000 27000L-1M 1 6 27000 30000 Full power is available from a standard 0 to 135 or 0 to 270 volt range. Optional 67.5/135 volt, 156/312 and 200/400 volt ranges are also available. Full power is available from 45 to 2.00 KHz for all models except for those with a 200/400 voltage range (EHV) option. The EHV option will operate up to 1000 Hz. The 4500L-3M has full power available from 45 Hz to 5.00 KHz. The 4500L-M is illustrated in Figure l-l. The output frequency can be programmed down to 17 Hz at a reduced output voltage.