def METHOD_NAME(self):
    """
    Retrieves current PSU voltage output
    Returns:
        A float number, the output voltage in volts,
        e.g. 12.1
    """
    voltage_out = 0.0
    attr_path = self.__psu_voltage_out_attr
    attr_rv = self.__get_attr_value(attr_path)
    if (attr_rv != 'ERR'):
        voltage_out = float(attr_rv) / 1000
    return voltage_out