2012 BFY Abstract Detail Page
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||W03 - Fundamentals of low-noise electrical measurements: Ground loops, interference, shielding, etc.
||In this workshop, participants will run through the highlights of a series of labs that teach students about amplifier noise, Johnson/Nyquist noise, capacitively- and inductively-coupled interference, and ground loops. Students learn both about the origins of these usually undesired signals, and how to minimize them. The labs require a low-noise amplifier such as a Stanford Research Systems SR560. Optionally, the students can instead design and build their own amplifiers, if time permits, based either on op amps or on instrumentation amplifier integrated circuits. In a culminating exercise, students measure the Johnson/Nyquist noise of a resistor at liquid nitrogen temperature. Workshop participants will be furnished with complete lab write-ups including conceptual questions for the students, complete lecture notes, supporting problem sets and solutions, and sample exam questions and solutions.
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