Relay contacts should be shielded from the coil to minimize induced noise from the relay powersupply.
继电器触点和线圈之间应该屏蔽，以使继电器电源引起的感应噪声最小。
2
High power factor, high efficiency, low noise, is the character that powersupply and electronic equipment pursuing.
高功率因数、高效率、低噪音是电源装置和用电设备普遍追求的品质。
3
In many portable instruments, the noise and EMI of its switch powersupply must be solved, the preferable method is that EMI power is reduced with spread spectrum frequency technique.