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A basic lock-in amplifier experiment for the undergraduate laboratory

Libbrecht, K. G. and Black, E. D. and Hirata, C. M. (2003) A basic lock-in amplifier experiment for the undergraduate laboratory. American Journal of Physics, 71 (11). pp. 1208-1213. ISSN 0002-9505.

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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.

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Additional Information:© 2003 American Association of Physics Teachers. Received 9 August 2002; accepted 9 April 2003.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12641
Deposited By: Tony Diaz
Deposited On:30 Jan 2009 00:40
Last Modified:26 Dec 2012 10:38

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