| Re: REW v. SMS Measurements
I experienced this myself when I got the SMS-1 and asked Bruce of Velodyne about it.
He says that the way SMS-1 measures is not by the freq that it hears at the time but the amplitute at the time the SMS-1 is outputting the test signal. So for example at 0.1ms when it outputs 15hz, it measure the volume it hears at the time and shows it on the graph and at 0.2ms when it outputs 16hz, it does the same and so on. It is suppose to have better then 1/60 octave accuracy and according to him is better in accuracy with the mic they are using which is basically the EM8000. that explains why you get a totally different result if you play a sweep from a DVD or from REW and try to see what SMS-1 measures instead.
Oliver
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