The MI 3116 PV Analyser XA is an advanced photovoltaic and electrical installation tester designed for maximum efficiency and precision for large PV systems. It combines insulation and I/U measurements of 1500 V PV systems in a single device while ensuring accurate testing of high-efficiency PV modules. A wireless (Wi-Fi) remote unit enables real-time measurement and logging of irradiation and cell temperature, enhancing data collection. The Auto Test function for Category 1 tests streamlines operation, while the innovative correction feature allows users to adjust previously incorrect parameters on completed measurements or entire test groups, ensuring greater accuracy and reliability in PV system diagnostics.