When operating the transformation ratio group tester, in order to protect the safety of personnel and property and avoid accidents, the following matters should be paid attention to:

1. The power fuse is 2A, inside the power socket. The test insurance is 0.5A. If the test line is short-circuited and the high and low voltage connections are reversed, the fuse will be blown. After the fuse is blown, if the measurement is performed, it will stop after displaying "Measuring, please wait!". Please turn off the machine, replace the insurance with the same capacity, and retest.

2. Keep the connection in good contact. The instrument should be well grounded!

3. The working place of the instrument should be far away from strong electric field, strong magnetic field and high frequency equipment. The smaller the power supply interference, the better. The lighting line should be used. If the power supply interference is still large, the instrument can be powered by the AC purification power supply. The capacity of the AC purification power supply is greater than 200VA.

4. When the instrument is working, if the LCD display is disordered, and there is no response when pressing all the buttons, or the measured value is far from the actual value, please press the reset button, or turn off the power, and then operate again.

5. The display has no character display, or the color is very light, please adjust the brightness potentiometer to the appropriate position.

The brightness potentiometer is a multi-turn potentiometer with 10 turns!

6. The instrument should be stored in a dry and ventilated place. If it is not used for a long time or the environment is humid, the preheating time should be extended before use to remove moisture.

7. Use when debugging the communication port.