The APS51 series precision programmable AC power supply is single phase AC power supply with variable frequency from 45Hz to 250Hz. There are three models in the APS51 series programmable AC power supply lab: 300V AC power supply 500VA 2kVA AC power supply 3kVA AC power supply The single phase AC power supply has low range 0-150V output and high range 300V output. There are three sets of memories to store voltage and frequency settings of the variable AC power supply. The single phase AC power source has fast response time 20ms and soft start function to set voltage rise time up to 99.999s. The precision AC power supply is a useful power tool for laboratory and factory.