Oscilloscope Vrms, wrong!

[lemon]

Probably the issue with FR cutoff when I applied a compensation file, was due that I haven't restart the software Mi-Pro.

I changed the values of compensation file with positive values ​​instead of negative ones that I had.
But I seem that this applied of both channels and not only to Ch.A, at the "Spectrum Analyzer Processing.." the menu "Apply to" is inactivate.

[lemon]

Let's see what happens if I applied a compensation notch file.

I create a .fcf file with the values as I show at the attachment and then I loading it via [Spectrum Analyzer Processing]>"Compensation 1".

All the band under 2K has gone, I see at the manual that all frequencies that falls outside the defined range will be given a gain value of –1000 dB.

At the start the .fcf file had only 2..8 values of harmonics, after I created this file with some frequencies from 10-1000Hz.

Right click on spectrum analyzer with only the A channel of notch filter has no enabled the "Generate Frequency Compensation File (Flat)" to try with this way.

Probably the issue with FR cutoff when I applied a compensation file, was due that I haven't restart the software Mi-Pro.

I changed the values of compensation file with positive values ​​instead of negative ones that I had.
But I seem that this applied of both channels and not only to Ch.A, at the "Spectrum Analyzer Processing.." the menu "Apply to" is inactivate.

OK, I resolved them.
The inactive "Generate Frequency Compensation File (Flat)" wants to stop the capture and of course works but it isn't useful in my case.

Here a new capture and I have complete some other measurements THD+N%, THDN_dB, am I right?

THD+N% = [THD_A(%)]*POW(10,([f1RMS_A(EU)]-[f1RMS_B(EU)])/20)/[f1RMS_B(EU)]
THDN_dB = 20*log10(([THD_A(%)]*POW(10,([f1RMS_A(EU)]-[f1RMS_B(EU)])/20)/[f1RMS_B(EU)])/100)

Now, I have on the Notch Channel, with the Method-1
THD% = 0.000016 %
THDdB = -135.90 dB
THDN% = 0.000023 %
THDNdB = -132.83 dB