1. The article introduces the GRS550 flying probe test system by Polar Instruments GmbH, which improves upon its predecessor with enhanced drive technology for faster test speeds and higher positioning accuracy. 2. This system is particularly suited for prototype and small-batch production, offering economical and user-friendly features. 3. It utilizes nodal impedance analysis and high-resolution imaging for effective fault diagnosis, reducing time and costs in PCB assembly repairs and accelerating time-to-market for prototypes.