MECHANICAL NOISE:

Mechanical vibration can generate electrical interference if magnetic fields are present. Capacitance changes associated with vibrating wires also lead to strange interference signals. Note that vibrating wires on the probe produce a quadrature signal proportional to . Make sure that all wires, especially those located near the magnet are tied down as tightly as possible, and that the system is well isolated from vibrations.

Especially important is assuring that the small gold, or platinum wires connecting the sample to the probe wires are held fast with some sort of adhesive grease.

The cryogens help damp out mechanical vibrations. It sometimes helps to bring the helium bath above the lambda point when making low temperature measurements. The normal state liquid helium damps out mechanical vibrations, whereas superfluid helium does not.