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Why do physical movements of cables create hundreds of picoamps of current?

Question :

Why do physical movements of cables create hundreds of picoamps of current?

Answer :

There are several ways that cables can generate error currents. First, the cable materials can generate currents similar to the way a piezo-electric crystal can generate charge. Second, friction between the concentric layers of a cable (coax) can generate static charge that flows along the conductive surfaces. These currents could be on the order of 100pA.

This FAQ Applies to:

Product Series: Keithley Nanovoltmeter Model 2182A

Product:

FAQ ID 70526

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