Precautions for JT80 three-phase digital ammeter:
1. Before use, the instrument needs to be powered on for 15 minutes.
2. Be careful to prevent vibration and impact, and do not use in places with excessive dust and harmful gases.
3. The input wire should not be too long. If the input end of the tested signal is too long, please try using twisted pair shielded wire.
4. If the signal is accompanied by high-frequency interference, a low-frequency filter should be tested online.
5. When stored unused for a long time, please power on for at least 4 hours every three months.
6. Long term storage should avoid direct sunlight and be stored at an ambient temperature of -25 ° C~55 ° C
7. If the instrument does not display, the auxiliary power supply should be checked first to ensure that the voltage is within the range.
8. If the display is abnormal, check if the input signal is normal and if the signal terminals are tightened.
9. Unless the PT has sufficient power, the PT signal cannot be used as an auxiliary power source to ensure the normal operation of the instrument.
10. The screws of the current connection terminals in the CT circuit must be tightened to ensure reliable contact between the incoming and outgoing lines, in order to avoid faults.
11. To calibrate instruments, the calibration instrument should be better than level 0.1 to ensure calibration accuracy.