def METHOD_NAME(self):
    """
    Retrieves current PSU voltage output
    Returns:
        A float number, the output voltage in volts,
        e.g. 12.1
    """
    volt_reading = self._get_dps_register(self.psu_voltage_reg)
    try:
        voltage = int(volt_reading)/1000
    except Exception:
        return None
    return float(voltage)