How can I more precisely measure a magnetic field using a Vernier magnetic field sensor?

The following are some suggestions for adjusting your experimental procedure and setup to more precisely measure a magnetic field:

Zero the magnetic field sensor in the position and orientation in which you want to use it and then keep it in that position/orientation. By zeroing the sensor in that specific position and orientation, you are effectively removing the Earth’s magnetic field from your measurement. Because the Earth’s magnetic field varies from location to location, it is important that you in the same position/orientation from trial to trial so that “zero” remains zero.
Fix the magnetic field sensor in place. A ring stand and test tube clamp can be very helpful in holding both a Magnetic Field Sensor (MG-BTA) or Go Direct^® 3-Axis Magnetic Field Sensor (GDX-3MG) in position. If you are using the Go Direct Magnetic Field Sensor, you may consider 3D-printing a sleeve to allow it to sit flat on a tabletop.
Move the source of the magnetic field, not the magnetic field sensor. It is important to keep the magnetic field sensor in the same place to maintain its zero. For instance, our Magnetic Field of a Permanent Magnet lab investigates magnetic field strength vs distance; students move the permanent magnet along a meter stick, rather than move the magnetic field sensor itself.

Published: December 19, 2022. Updated: December 19, 2022.