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Oscilloscopes are designed to faithfully measure various signal parameters, but they are only one part of the measurement system. In the means of getting the signal accurately from the device under test (DUT) to the oscilloscope input, the use of a suitable probe is essential. Even though the probe selection is the last consideration, that we usually take for granted, it vitally affects the fidelity of the entire measurement system. The result can be wrong or misleading measurements. Solely connecting a probe to a single test point can affect the behaviour of your PCB design, so that an oscilloscope would only see the distorted version of the actual signal. Thus ensuring a minimum impact on the probed circuit is imperative. In essence, the probe is the first link in the measurement chain and the fidelity relies as much on the probing as the oscilloscope.
