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(1) The oil cup adopts a three-electrode structure in compliance with the national standard GB/T5654-2007, with an electrode spacing of 2 mm, which helps to eliminate the influence of stray capacitance and leakage on the dielectric loss test results. (2) The instrument uses medium-frequency induction heating and a PID temperature control algorithm. This heating method offers advantages such as non-contact between the oil cup and the heating element, uniform heating, fast speed, and easy control, enabling the temperature to be strictly maintained within the preset temperature tolerance range. (3) The internal standard capacitor is a SF6-filled three-electrode type capacitor; its dielectric loss and capacitance are not affected by environmental factors such as temperature and humidity, ensuring that the accuracy of the instrument remains consistent even after long-term use. (4) The AC test power supply uses an AC-DC-AC conversion method, effectively preventing fluctuations in mains voltage and frequency from affecting the accuracy of dielectric loss testing; even when powered by a generator, the instrument can still operate correctly. (5) Robust protection functions. In the event of overvoltage, overcurrent, or high-voltage short circuits, the instrument can quickly cut off the high voltage and issue a warning message. A warning message is issued when the temperature sensor fails or is not connected. A temperature limit relay is installed in the medium-frequency induction heating furnace; when the temperature exceeds 120 degrees, the relay activates and the heating stops. (6) The test parameters are easy to set. The temperature setting range is 0～125℃, the AC voltage setting range is 500～2200V, and the DC voltage setting range is 0～500V. (7) It features a large LCD display with backlighting for clear visualization. The user interface is user-friendly; simply follow the instructions in the Chinese menu and enter the commands, and the instrument will carry out the tests automatically. And it automatically stores and prints the test results. (8) Equipped with a real-time clock; the test date and time can be saved, displayed, and printed along with the test results. (9) Empty electrode cup calibration function. Measure the capacitance and dielectric loss factor of the empty electrode cup to assess its cleaning and assembly condition. Calibration data is automatically saved to facilitate accurate calculation of relative permittivity and DC resistivity.