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It appears that your magnitude frequency response measurement used periodic pink noise (PN Pink) as the stimulus together with wide-band octave analysis in ARTA. This differs from using true white noise excitation with narrow-band FFT analysis in Multi-Instrument. Similar to frequency sweeping ...

To obtain the absolute attenuation rates at different frequencies, the Bode plot function should be used. However, substantial differences can be observed between your measured gains and the simulation results from LTspice, especially around 1 kHz, where the measured value is about 36 dB, while the ...

The absolute compensation file can be generated automatically using the transfer function measurement function in Multi-Instrument, with the input signal fed into Ch.B and the response fed into Ch.A. The generated compensation file has a *.gpc format (i.e. including absolute Gain and Phase). Similar ...

Actually, in the above discussion, the compensation factor at the fundamental frequency is assumed to be 0 dB (i.e., no compensation). If the compensation file is constructed manually or generated from the measured frequency response, with absolute gain values, to flatten the true frequency response ...

Method 1 for THD+N

(1) THD+N in dB
[THDNDB_A(dB)]+[f1RMS_A(EU)]-[f1RMS_B(EU)]

(2) THD+N in %
POW(10,([THDNDB_A(dB)]+[f1RMS_A(EU)]-[f1RMS_B(EU)])/20)*100

or

[THDN_A(%)]*POW(10,([f1RMS_A(EU)]-[f1RMS_B(EU)])/20)

[Spectrum Analyzer Processing]>"Weighting">"Apply to" is for frequency weighting profile selection only. On the other hand, it is possible to specify the compensation factors for individual channels. If the compensation file is mono, it applies to both channels. If it is stereo, it applies to each ...

For THD (20–20 kHz, without compensation), Method 1 measured a higher value (0.0000099%) than Method 2 (0.0000079%). This is expected, as Method 1 includes a greater number of harmonic orders (2nd-20rd vs 2nd-9th)

For THD (up to the 8th harmonic, without compensation), Method 1 measured a slightly ...

With the notch filter output fed into Ch. A, the original signal (i.e., the input to the notch filter) fed into Ch. B, Spectrum Analyzer working in the THD measurement mode, and the Y-scale of the Spectrum Analyzer set to dBr, dBV, dBu, dBSPL, or dBFS, you can define a UDDP (User Defined Data Point ...

Spectral leakage occurs when the sampling parameters do not satisfy the requirements for coherent sampling, i.e., [Sampling Rate] / [Signal Frequency] = [FFT Size] / [Number of Cycles]. When this condition is not met, the energy of a frequency component spreads into adjacent FFT bins, resulting in a ...

At the notch output, your RMS multimeter measured 0.96 mVrms, while the screenshot shows that MI measured 0.8531 mVrms (or 1.2432 mVp). The two values are quite close, considering that your RTX6001 was set to a 4.472 V input range, which is too large to accurately measure such a small-amplitude ...