Is there a roll-off with the SVT octave analysis vi's?

I built a spectrum analyzer that displays 1/3 octave and narrowband data. I'm using the PXi chassis with 3 NI4472 daq cards. I noticed when putting in low frequency tonals (from function generator, amplified to 1 Vrms) the SVT 1/3 octave analysis vi has a roll-off associated between 10-100Hz. Narrowband (using power spectrum vi) quantifies the correct level extactly. I've noticed the SVT Octave analysis vi's roll-off the amplitude levels by as much as 50-60dB at 10 Hz. Does anyone know the solution to this problem.

Could you post a sample of the code that demonstrates the issue? Are you applying weighting (A-weighting would apply a relative response of -70 dB at 10 Hz) to the signal when you do octave analysis?
When I input a 10 Hz tone from a function generator to to AI0 of a 4472, I get consistent results between the power spectrum and 1/n octave (see attached results).
Another thought, how did you implement 1/3 octave analysis? The 1/3 octave analysis VIs take an enum for the low frequency where the lowest frequency in the enum is 20 Hz. I had to use the 1/n octave VI which takes a DBL for the start frequency.
Hopefully, some of this rambling helps,
Doug
Doug
NI Sound and Vibration
Attachments:
Power_Spectrum_vs_1_3_Octave_with_4472.vi ‏67 KB

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