RLC Box Filter-Topologies

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Follow-up video with improvements in the "Deluxe model": • RLC Box Standard and D...
Direct links for purchasing:
Deluxe model: www.ak-modul-b...
Standard model: www.ak-modul-b...
Before you ask: The little dip you see in the frequency-response curves on the oscilloscope seems to be a resonance-effect from the used 100µH inductor in the prototype. You can see it vanish at the end of the video when I manually change the L and C values in the bandstop-filter.

[@davadoff]

Why is half the level sometimes -3dB and sometimes -6dB ?

[@KainkaLabs]

When it is about LEVEL, only -6 dB is correct. That´s because half the level is a quarter of the power and a quarter of the power is -6 dB. Remember that dB always relates to relative power (wattage) ratios. Power is proportional to the square of voltage or current: P = Ü^2/R or P=I^2*R
That´s why (due to the logarithmic definition of dB) there is a factor of 2 between talking about power and talking about level (voltage) or current concerning dB-values-

[@qwaqwa1960]

No MATH TRACE (log) feature on that Rigol?

[@KainkaLabs]

It does of course have the log(10) function in the math-menu. But for some reason I couldn´t make it work for this measurement.
And I didn´t have my analog dB-converter build exactly for that purpose at hand here in the lab.