Re: Oscope measurement and probe grounding

At best you are measuring the circuit you are probing with a ground
that is referenced to your scope ~ So you measurement is off by the
voltage drop induced by the probe cable. At worst your probe is just an
antenna and your picking up a lot of additional noise.

How ever because you probe does not even cover the frequency being
measured it may look better then it really is. You need a probe that
works over the frequency range being measured, and a probe which is
grounded as near the probe point as possible.

.

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