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Figure 4: HF transient response with (left) and without (right) extension leads
Probe Loading
When you touch your probe tip to a circuit element, you are introducing
a new resistance, capacitance, and inductance into the circuit.
Frequency and impedance of the source determine how much the probe
loads the circuit that you are measuring. As the frequency of the source
starts to increase beyond 1 kHz, the input impedance of the probe begins
to decrease. The lower the impedance of the probe relative to that of the
source, the more the probe loads the circuit under test.
The probe has virtually no loading effect on sources with relatively
low impedance and low frequency.
P5200 Instruction Manual
Operating Basics
13
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