Setting up the detuner After the last exercise, switch the motor off by turning off the power supply. DO NOT CHANGE THE SETTINGS. For this lab the purpose of our detuner is to totally detune a particular vibration frequency of the attached beam by having a matching resonant frequency. What would be the arm lengths of the detuner so that its fundamental frequency matches that of the beam? (m 0.3kg, d=3.2mm, E 200GPa). Calculated detuner arm lengths = m.