1. Detection and fault analysis of low-voltage circuit of vehicle charger. 2. High voltage maintenance switch detection and fault analysis. 3 detection and analysis of high voltage interlock circuit. 4. High voltage circuit layout structure and composition of high voltage distribution box. 5. Detection and fault analysis of low-voltage circuit of motor controller. Technical specifications; 1. Overall dimension: 1800mm × 900mm × 1200mm long × wide × High) 2. Weight: 180kg 3. Working temperature: - 20 ℃ ~ 50 ℃