Introduction to basic knowledge of staying away from electromagnetic radiation
In the bedroom
Do not place your phone or other communication devices on the bedside table, or choose to turn them off directly. Instead, turn off the wireless network first.Dual Testing Functions: the EMF meter can accurately detect and measure the electric field radiation and magnetic field emission at the same time. It also can measure the environment temperature(℃/℉).
Do not place the baby monitor next to the cradle, place it at least 90 centimeters away.
During a call
Choose to wear headphones or use hands-free mode to keep your phone in your pocket.
In the living room
Do not place the Wi Fi set-top box or wireless phone in the living room where you may be staying for a long time, and try to stay as far away as possible.
In the kitchen
Install the microwave at a height higher than that of a child, and do not stand in front of the microwave during operation. If you have other kitchen utensils that require electricity such as coffee pots, rice cookers, food processing machines, etc. in your kitchen, make sure to disconnect the power when not in use.
In transportation
Cars or trains in motion often receive weaker signals, in which case mobile phones will transmit stronger signals to communicate with the nearest antenna. Please avoid making phone calls or consider using hands-free at this time.
Does the operation of the motor generate radiation
The widely used three-phase or single-phase motors directly driven by 50Hz AC do not generate electromagnetic radiation due to their low frequency and smooth sine wave.
But if a pulse width modulation (PWM) power supply is used to control the motor, such as using a frequency converter to drive the motor, there will be strong electromagnetic radiation in the output cable and motor parts. Mainly because pulse waves contain rich high-frequency harmonic components, which radiate energy outward in the form of electromagnetic waves. The purple wave shown in the figure below is the spectral line diagram of the yellow pulse, which is derived from Fast Fourier Transform (FFT) and contains many high-frequency components with high amplitudes, constantly radiating energy.
Electromagnetic radiation can cause serious interference, interfere with the normal operation of nearby electronic devices, and even lose control. Shielding measures must be taken to eliminate this radiation, which has almost no harm to the human body. Firstly, its attenuation is relatively fast, and secondly, its energy is not significant.
