I am working in the area of aerospace vibration testing and we use swept sine tests on structures and measure the response using the accelerometers. I tried implementing the technique "Simultaneous measurements of impulse response and distortion with a swept sine technique" for analysis of the response acquired for a swept sine test. In the analysis we basically try to plot the accelerometer amplitude response versus frequency. I could plot the straight spectrum. However, a change in the amplitude in the accelerometer response causes a change in the amplitude of the plot. Is there any way for amplitude scaling in the mentioned technique. i.e if I increase the amplitude of the swept sine to some X value, then the final FFT spectrum of impulse response also should have the same X amplitude. Please let me know.