The California Instruments Model 1503T is a solid state, high performance, low distortion power source that provides up to 1500 VA three phase power when used with the proper California Instruments oscillator. The Model I503T Three Phase Power Source is illustrated in Figure 1 -1 „ Full power output is available in two different voltage ranges and over the frequency range from 45 Hz to 5 KHz. The output voltage range is normally determined at the factory prior to shipment of the unit, however, it can be accomplished in the field, if required. The full power ranges are: 1) 58. 5 to 75 volts rms line-to-neutral in a three phase output configuration. This provides 102 volts to 130 volts rms line- to-line at 500 VA per phase (1500 VA total). 2) 105 to 135 volts rms line-to-neutral in a three phase output configuration. This provides 182 volts to 234 volts rms line-to- line at 500 VA per phase (1500 VA total). The serial number tag, located on the rear of the Model 1503T Power Source, indicates the output voltage range which the unit is wired for at the time of shipment. Two of the three power amplifiers may be combined with the applicable plug-in oscillator to provide 1000 VA of two phase power. In this case, the line-to-line voltage is 1.414 times the line-to-neutral voltage rather than 1. 732 times the line-to-neutral voltage. Also each of the three 500 VA power amplifiers may be used independently of one another by removing the three jumper strips on the rear of the 12 pin connector and applying the desired input into each amplifier.