1. As compared with the test system in LCR charging and discharging mode, volume and weight of the device, as well as cost, have been reduced significantly.

2. The device measures impedance of primary sample circuit, and automatically controls its output current to target current based on measurements.

3. When the required test output capacity exceed maximum output of the device, I2t equivalent test method is applied automatically to make the test feasible.

4. The test is fully automated. The control circuit of device monitors all signals of test circuit such as primary circuit current, primary circuit voltage, voltage and current of internal variable transformer and system line voltage.

5. The test process is simple and quick, and values and time curves of various signals during test, including primary circuit current, primary circuit voltage and output voltage of device voltage regulator are recorded and stored.