Tektronix P6209, Instruction Manual

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Operating Basics
P6209 4 GHz Probe Instruction Manual
15
You can determine if ground lead effects may be a problem in your
application if you know the self-inductance (L) and capacitance (C)
of your probe and ground lead. Calculate the approximate resonant
frequency (f
0
) at which this parasitic circuit will resonate with the
following formula:
f
0
=
1
2 π LC
The preceding equation shows that reducing the ground lead
inductance will raise the resonant frequency. If your measurements
are affected by ringing, your goal is to lower the inductance of your
ground path until the resulting resonant frequency is well above the
frequency of your measurements.
The low-inductance ground contacts described in Accessories can
help you reduce the effects of ground lead inductance on your
measurements.