Answers
A) Let us consider my birth month is 07 and day is 20. So, the cut-off frequency of the filter is 720Hz.
Designed LPF is shown below. The cut off frequency is given by the equation:
If we take R=4.7 kOhm and C=47nF, which gives cut off frequency=720.48 Hz
B) 1X probe is more suitable for low frequency applications. In general, for few mili-units to few tens of unit measurement case, we use 1X probe. Just because, it does not reduce the signal's amplitude.
C) Precision resistor with code 4321F has a value of 4.32kOhm ± 1% tolerance.
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