The use of power test equipment has precautions, the following to give you an example, automatic ratio group tester precautions.
1. Overcurrent insurance is 0.5A. If the test line is short-circuited, the high and low voltage connection is reversed, it will fuse the safety. After the fuse is cut off, the buzzer inside the instrument will give an alarm sound. Please shut down, replace the same capacity insurance, retest.
2, the connection should maintain good contact. The instrument should be well grounded!
3, the instrument's workplace should be far away from strong electric field, strong magnetic field, high frequency equipment. The smaller the interference from the power supply, the better. The lighting line should be selected. If the interference from the power supply is still large, the ac purification power supply can supply power to the instrument. The capacity of AC purification power supply is greater than 200VA.
4. When the instrument is working, if the LCD screen displays disorder, all the keys have no response, or the measured value is far from the actual value, please press the reset key, or turn off the power supply, and then re-operate.
5, the display has no character display, or the color is very light, please adjust the brightness potentiometer to the appropriate position.
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 prolonged before use to remove moisture.
7, communication port debugging.
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