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Oscilloscope Probes

Probes used with an oscilloscope should be matched to the scope bandwidth. A rule of thumb it that the probes should at least match if not exceed the bandwith of the oscilloscope. If possible, buy a 10X probe, which has a 10:1 attenuation setting. This will reduce circuit loading and increase the overload protection.

For high-speed signals in excess of about 200MHz, passive scope probes are hindered by the capacitance of the cable going into the scope. This problem is solved by using an active probe that has FET buffer amplifiers built into the tips.

When measuring high-voltage power signals above around 100V, consider using a differential amplifier probe for isolation.