■ The instrument adopts medium frequency induction heating and PID temperature control algorithm. This heating method has the advantages of non-contact between the oil cup and the heating element, uniform heating, fast speed, and convenient control, ensuring that the temperature is strictly controlled within the preset temperature error range.
■ The internal standard capacitor is a three-electrode capacitor filled with SF6 gas. The dielectric loss and capacitance of this capacitor are not affected by environmental temperature, humidity, etc., ensuring the accuracy of the instrument even after long-term use.
■ The AC test power supply adopts the AC-DC-AC conversion method, effectively avoiding the influence of fluctuating mains voltage and frequency on the accuracy of the dielectric loss test. Even when powered by a generator, the instrument can operate correctly.
■ The instrument has perfect protection functions. When there is overvoltage, overcurrent, or high-voltage short circuit, the instrument can quickly cut off the high voltage and issue a warning message. When the temperature sensor fails or is not connected, a warning message is issued.
■ There is a temperature limit relay in the medium frequency induction heating furnace. When the temperature exceeds 120 degrees, the relay is released and the heating stops.
■ It adopts a large-screen LCD display, with a user-friendly interface. By following the prompts and inputting commands in Chinese menus, the instrument can automatically perform tests. It can also automatically store and print test results.
■ It has a built-in real-time clock, and the test date and time can be saved, displayed, and printed along with the test results.
■ It has a calibration function for the empty electrode cup. It measures the capacitance and dielectric loss factor of the empty electrode cup to determine the cleaning and assembly condition of the cup. The calibration data is automatically saved to facilitate the accurate calculation of relative permittivity and DC resistivity.
