Lock in Method

\label{sec:lock_in_method}

Due to the problems associated with the output current from the Kepco DC to AC Current Supply based on the input voltage from a DC power supply or AC oscillator, we should use the expression \(I_{coil,dc}=\beta V_{osc,dc}\) to convert \(V_{osc,dc}\) to the current directly.

Experimentally \(\beta\) is found to be 0.6137 \(\frac{A}{V}\) (taken from Professor Nathanael Fortune’s Kepco Current Source Voltage to Current Conversion Factor, verified at several voltages).