Sensors are highly critical in PD diagnosis systems. If the sensitivity and SNR (Signal to Noise Ratio) of sensors are poor, the diagnosis systems will be useless even if high quality systems are installed after the sensors. Our RFPD CTI sensor has highly superior quality that has passed global standards. By using the core developed through many years of research, the sensor boasts unique and world-class sensitivity and SNR. With 200 MHz linear characteristic and a 1 pC response characteristic, the sensor provides the sensitivity required by global standards.