During the experiment, it is only necessary to set the test voltage/current value, and the equipment can automatically boost/boost the current, and quickly display the voltage ampere characteristic curve or transformation ratio, polarity, and other experimental results of the transformer. It supports data storage and on-site printing, not only eliminating the tedious work of manual voltage regulation, manual recording, curve tracing, but also uploading the test data to the computer through the USB interface for editing, saving, or printing. Easy to operate and improve work efficiency, it is a high-tech product with high cost performance.