Tektronix P7225, User Manual

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P7225 2.5 GHz 10X Active Probe User Manual
This method is very useful when making many measurements on the
same package. Using a ground plane on the IC package makes
probing the IC package easier and avoids adding unnecessary ground
lead length and distortion.
SureFoot Grounding
If you cannot use the recommended low-inductance grounding
method, you may ground the probe to the IC package under test
using a SureFoot adapter. Refer to Figure 9.
Figure 9: Using a SureFoot adapter for grounding
Use a SureFoot adapter at the end of a short ground lead to connect
directly to the IC package ground. This method is preferred over
using an adjacent circuit ground because it is the shortest ground
path possible.