In addition, in order to accurately measure the low frequency resonances, the fast Fourier transform (FFT) res-
olution must be sufficiently fine to accurately measure the low-frequency resonance. A good place to start is to
have an FFT resolution of 1/10 of the frequency of the lowest anti-node. In the case shown below, an anti-res-
onance of 12 Hz is present, so the resolution should be approximately 1.2 Hz FFT resolution. The Autotuner can
function with the resonance if it is accurately measured, as shown below. To adjust the FFT resolution, adjust
FFT Points in the Recording Options tab as needed.
AKD User Guide | 14 Tuning Your System
Kollmorgen | December 2010 147
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