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Published November 2003 | Published
Journal Article Open

A basic lock-in amplifier experiment for the undergraduate laboratory


We describe a basic experiment for the undergraduate laboratory that demonstrates aspects of both, the science and the art of precision electronic measurements. The essence of the experiment is to measure the resistance of a small length of brass-wire to high accuracy using a simple voltage divider and a lock-in amplifier. By performing the measurement at different frequencies and different drive currents, one observes various random noise sources and systematic measurement effects.

Additional Information

© 2003 American Association of Physics Teachers. Received 9 August 2002; accepted 9 April 2003.

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