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Insufficient cable shielding causes medical device problems
by：Foxron
2021-09-23
The medical industry needs to use very sophisticated equipment to measure various values u200bu200band diagnose the patient's condition. Therefore, the hardware processing of medical equipment must be accurate, which is conducive to the development of the medical industry and can be diagnosed in a timely manner. Fuyang Zhongrui Electronic Components Factory is mainly a processing manufacturer, including CNC lathe processing, compact metal processing, precision instrument parts processing, and Zhejiang shaft processing.
I just mentioned medical machinery and equipment. I told you today that the shielding of cables is insufficient for the problems between medical devices. When the equipment encounters electromagnetic emission or radio frequency anti-interference problems, cable problems are generally involved. The ground impedance played a big role here.
The principle of 'single point grounding' is suitable for low frequency, but it has little effect on radio frequency. The tricky thing is that because the cable cannot be terminated at the patient's terminal, the shield cannot be grounded at both ends. In addition, when the equipment cannot be effectively grounded or even needs to maintain insulation, filtering is sometimes more effective than shielding.
At low frequencies, the shielding layer of the cable can be grounded at one end, but if the length of the cable exceeds l/20 of the wavelength, the shielding layer of the cable needs to be grounded at two or more points. It should be pointed out here that the situation will be worse when the cable length is 1/4 of the wavelength. By the way, many commercially available cable shielding layers are braided products, which is unfavorable for solving the electromagnetic compatibility of radio frequency. In addition, the shielding layer of the cable is also easily damaged. For example, some cable shields are made of polyester film, which is not very strong. Sometimes even a slight touch can cause the shield to break and reduce the shielding effect. This kind of break is difficult to detect with the naked eye. Article source and Baidu.
I just mentioned medical machinery and equipment. I told you today that the shielding of cables is insufficient for the problems between medical devices. When the equipment encounters electromagnetic emission or radio frequency anti-interference problems, cable problems are generally involved. The ground impedance played a big role here.
The principle of 'single point grounding' is suitable for low frequency, but it has little effect on radio frequency. The tricky thing is that because the cable cannot be terminated at the patient's terminal, the shield cannot be grounded at both ends. In addition, when the equipment cannot be effectively grounded or even needs to maintain insulation, filtering is sometimes more effective than shielding.
At low frequencies, the shielding layer of the cable can be grounded at one end, but if the length of the cable exceeds l/20 of the wavelength, the shielding layer of the cable needs to be grounded at two or more points. It should be pointed out here that the situation will be worse when the cable length is 1/4 of the wavelength. By the way, many commercially available cable shielding layers are braided products, which is unfavorable for solving the electromagnetic compatibility of radio frequency. In addition, the shielding layer of the cable is also easily damaged. For example, some cable shields are made of polyester film, which is not very strong. Sometimes even a slight touch can cause the shield to break and reduce the shielding effect. This kind of break is difficult to detect with the naked eye. Article source and Baidu.
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