Fast delivery Product Introduction The HZDP-90kV VLF Hipot Tester is engineered for extra-high-voltage insulation systems in large-scale power facilities. It performs AC and DC withstand tests, including the latest 0.1Hz ultra-low frequency method recommended internationally. The tester integrates a 7-inch touchscreen, ARM7 microcontroller, and advanced AD acquisition circuit for high-precision measurements. Designed for extra-high-voltage cables, massive capacitors, and very large generators, it ensures maximum safety and fully conforms to national standards and the 2004 L/T849.4-2004 technical conditions for ultra-low frequency high-voltage generators. 4. Voltage positive, negative peak error: <3% 5. Voltage waveform distortion degree: <5% 6. Conditions of use: indoor, outdoor; temperature: -10°C~+40°C; humidity: <85%RH 7. Power supply fuse: See table 3 8. Power Supply: Voltage 220V±5%, 50±5Hz Note: If the portable generator is used for power supply, the generator output voltage and frequency are required to be stable (generally, the power is greater than 3kW, the frequency is 50Hz, and the voltage is 220V±5% • High-tech digital frequency conversion with microcomputer control for voltage rise, drop, measurement, and protection. • Fully automated testing process for operational efficiency. • Easy operation: simple wiring and intuitive user interface. • Comprehensive safety: over-voltage and over-current protection on high and low voltage sides with fast response <10ms. • Safe and reliable: controller interfaces with generator low voltage via photoelectric isolation. • High/low voltage closed-loop negative feedback keeps output steady with no capacitive overshoot. • Full features: capacitive touch screen, Chinese LCD display, automatic storage, and printing. • Wide frequency selection: 0.1Hz, 0.05Hz, 0.02Hz.