modal test question

Is it possible to force the gain channel to show data in dB ? Or maybe the solution is to use a math channel to calculate dB from the gain value?

Thanks

Hi,

if the modal test is used, it is possible to choose between different y axis types.

Different amplitude scales of FFT can reveal more about the signal if used correctly. Linear amplitude scale gives the best view of maximum peaks in the signal, logarithmic can show more invisible peaks and signal noise but gives worse comparison of high and low peaks. Scale in dB gives the best estimation of signal noise if 0 dB is maximum measurable value and is also used in noise measurements, where the sound dB scaling is actually the result since the human ear has logarithmic sensitivity to noise. The reference dB scale gves you the option to select the reference for the logarithmic calculation (Value[dB]=20*log10(Value/Reference)).