Graph at high frequency

**dvenardos** · **02-01-09, 11:35 PM**

At higher frequency (starting around 300hz) my graph is all over the place. I am using the CFM-140 with correction file. Any idea what would cause this?

**Wayne A. Pflughaupt** · **02-01-09, 11:42 PM**

It's comb filtering, due to reflections, Try 1/3-octave smoothing.

Regards,
Wayne

**atledreier** · **02-02-09, 01:28 AM**

Either that or take a few readings at slightly different positions and average them.

**dvenardos** · **02-02-09, 01:59 AM**

Quote:

Wayne A. Pflughaupt wrote:

It's comb filtering, due to reflections, Try 1/3-octave smoothing.

That did it, thanks.

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