This test here is similar to a frequency response test. The testing parameters must be set properly in order to get meaningful results. For example,
(1) If you use the peak hold method, then the frequency resolution of FFT and signal generator sweep speed must be set correctly to produce a smooth final curve...
(2) If you use a non-repetitive normal white noise, you have to average the result to get a thin curve, unlike the case of using a "periodic white noise".
(3) If you use frequency sweep, you have to capture the entire sweep in one single oscilloscope frame from start to end, and the FFT Size must be greater or equal to the Record Length, and the window function must be rectangle ....
Here is an example of using a normal white noise.
- ReproducingRIAA-WhiteNoise.png (143.12 KiB) Viewed 485692 times
Below is an example of using a log sweep and 1/96 octave analysis.
- ReproducingRIAA-LogFreqSweep.png (152.74 KiB) Viewed 485692 times
morillon wrote:
(here in advanced and very detailed resolutions and (the resolution of your cal file is significantly lower than those I pointed out to you... maybe that's simply where it's at...?)
Definitely not. Multi-Instrument uses interpolation in between so the curve will be very smooth as shown in all the examples above (see the frequency resolution displayed at the bottom left in each screenshot).
