The instrument itself output current, voltage, can meet most of the CT testing requirements, when test a large CT, you can buy an external high voltage generator, or an external high current generator to achieve the same effect. In accordance with IEC standards IEC 60255-11 2008(Ed.2.0) Measuring relays and protection equipment–Part 11.

(1) Full automatic Tester: only need a digital set, and set the maximum output test voltage, the maximum output current and the step length, the device will automatically step-up from zero gradually. Automatically record the entire process of test data and automatically display Volt-Ampere curve, eliminating manual voltage regulator, manual recording, organizing, describing curves and other tedious labor. This device is fast, accurate, simple, and convenient.
(2) Powerful function: a single power input, 220V or 380V power adaptive. Standalone operation can make the test of curves test with 5% and 10% error, volt-Ampere characteristics and turns ratio polarity of current transformer; it can be connected to the computer or read the test data through the computer.
(3) Non-contact testing, high security: Full computer-based devices, it can automatically test, and need not manual contact the test product after set. Keeping the operator far away from high voltage circuit, to ensure the safety and high reliability.
(4) The device also with the features of high capacity output, large-screen LCD, high capacity storage, rotation mouse and so on.