1, The instrument must use a plug with a grounding pin, and ensure that the power socket of the instrument is well grounded. 2, The power supply used should be consistent with the specified power supply value marked on the machine, otherwise the machine may not work or even burn out the main board parts of the machine. 3, Ensuring that the power supply is stable and adapted. If the local power supply voltage is unstable, it’s recommended that the user add a regulated power supply with matching power.