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A metal-encased medical device such as an ECG machine can be powered either from a wellgrounded...

A metal-encased medical device such as an ECG machine can be powered either from a wellgrounded perfectly insulated 120V AC power source, or from a battery. Which power source you recommend, and why?

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Answer #1

Medical devices such as ECG machine which requires AC power supply or battery power supply, needs constant power supply throughout procedure. Now AC power supply with well grounded supply power with frequency, now we already know frequency may introduce noise in the signal generated from body of a patient. If we use battery there may be no such problem, as well as a constant power supply throughout procedure and no interruption while recording heart beat. Therefore both power supply is used but now a days battery power supply is mostly used in ECG machine.

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