The Cadwell Current Supply was tested for linearity of magnetic field measurements as a function of the power setting on the unit. The circular TMS coil was used for the measurements. Sixteen measurements for each power setting was taken with the SMP for a point on the edge of the TMS coil at a distance of 0.5cm above the coil. The average magnetic field magnitude in Tesla was plotted against the power setting. Error for the measurements was determined by taking a standard deviation of the 16 measured values. A linear regression was done on the resulting data. The data shows a very linear relationship between the power setting on the Cadwell unit and the magnetic field measurements of the SMP.
