S0 Pulse Outputs - DDS & DTS Series Kilowatt Hour Meters The DDS-1Y-18L-40A, DDS-1Y-36L-80A-M & DTS-353-100A-M have S0 pulse outputs which conform to the DIN standard 43864. S0 pulse outputs can be used in a current sink NPN configuration or a current source PNP configuration. The requirements of this standard are as follows: Maximum output voltage 27V Maximum output current 27mA Minimum drive current >10mA into 800 Ohms On status level >2.2mA Below is a typical S0 pulse output circuit for these meters, showing both NPN & PNP applications.