TITLE:
A basic lock-in amplifier experiment for the undergraduate laboratory
AUTHOR(S):
Ken Libbrecht, Eric Black, and Christopher Hirata (Caltech).
DATE:
2002 Aug 09 (submitted), 2003 Apr 09 (Am. J. Phys., accepted), 2003 Nov (Am. J. Phys., published).
AVAILABILITY:
American Journal of Physics
PUBLICATION INFORMATION: Am. J. Phys., 71, 1208--1213 (2003).
ABSTRACT:
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.
ADS BIBLIOGRAPHIC CODE: N/A.
COMMENTS: N/A.