Isee, it is complex but can be accurate.
But as I understand it you really have to relate the thermal losses to the real power loss, reactive power does not produce heath.
Regards,
Ignacio EB4APL
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El 23/03/2021 a las 18:56, Manfred Mornhinweg escribi¨®:
It looks like measuring the Q of high quality capacitors could be very
difficult, even at single frequencies.
Well, there is always the thermal method: Put the capacitor under test in a resonant circuit, thermally disconnected from the coil, excite it to a high amplitude, and measure the temperature rise of the capacitor. Several methods can be used to calculate the loss from temperature rise, or putting the capacitor in a thermal enclosure together with some more thermal mass, and measure the rate of temperature rise, and so on. Once the power loss has been computed, it's simple to relate it to the reactive power in the capacitor, and calculate Q or dissipation factor from that.
But it's a rather complex and slow method, to get the Q at just a single frequency.
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