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Chapter 2: Probing Considerations
Introduction
This chapter gives you some guidance about the effects of probing and how to
get the best measurement results. The effect of the following parameters are
covered in this chapter:
• Resistive Loading
• Capacitive Loading
• Ground Inductance
• Bandwidth
Two important issues while measuring signals with probes are how the probe/
oscilloscope combination represents the signal at the probe tip and how the
probe affects the circuit during the measurement.
When a probe is connected to a circuit to measure a signal it becomes part of
the circuit. Probing a signal can be easy and successful if some forethought is
given to the nature of the circuit under test and what type of probe best solves
the measurement problem. Because of the wide variety of signals that may be
encountered, ranging from high bandwidth (fast rise times) to high
impedance, in a given situation one probe may do a better job than another.
Therefore, it is helpful to understand the different effects caused by the
interaction between the probed circuit and the probe.
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