Discussion
Why does an oscilloscope probe's capacitance reduce a measured bandwidth?
Answer: A
A probe presents tens of picofarads to earth, which shunts the signal exactly as any other stray capacitance would and lowers the break frequency at the point being measured. Its resistive loading is negligible at megohms, and it adds no significant series inductance. The instrument disturbing what it measures is a general hazard, and it is why a compensated low-capacitance probe is used for high-frequency work and why a measurement should be repeated at a different point when the result looks suspicious.
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