Below are the solutions to the SAQs for the bioengineering instrumentation video on 60 Hertz Main Noise:
1. C. Multimeters are not a source of 60 Hz noise.
This is because they are not powered by the electrical grid, which runs on standard 60 Hz AC power.
2. False, 60 Hz noise is a source of external noise.
External noise is generated from outside (as opposed to within) the electronic circuitry being implemented. This is the case for 60 Hz noise, which comes from the 60 Hz AC power supply of other electrical sources.
3. Use a bandstop (also called a notch or band reject) filter. A variety of answers between 40-80 Hz for cutoff frequencies are most acceptable (one above and one below 60 Hz).
A band stop filter consists of both a high-pass and low-pass filter in series so that only small band of frequencies is attenuated. Here, it is desirable to attenuate 60 Hz noise right in the middle of your signal while preserving as much of the rest of the signal as possible since 60 Hz is right in the middle of the signal frequency range. Cascaded filters may also be helpful.
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