When I display my data as octaves, the lower octave bands do not show.
For example, with 1/3 octave, I only see data down to 50 Hz octave band. Would like to get to 20 Hz octave band.
I processed the data with a 2 Hz resolution, frame of 0.5 seconds, stationary tracking, energy average.
Displaying in 1/24th octave only shows to 350 Hz octave band.
Solved! Go to Solution.
If you are using the octave display to view narrowband data, there is a requirement in Testlab to have at least 5 spectral lines worth of data per octave. Because the lower frequency octave bands are narrower, it is not always possible to get 5 spectral lines within the band.
Under "Tools -> Options -> General" of Testlab, this requirement can be modified. By switching "Minimum spectral lines for octave band" from 5 to 1, more bands will be calculated.
If this is not sufficient, then the data will need to be reprocessed with a finer frequency resolution.