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Greetings

Q can be derived for either L or C by measuring their complex impedance .? In either case Q is a ratio of the real to imaginary values provided by the VNA.? I have recently spent considerable hobby time using my N2PK VNA to derive equivalent series resistance (ESR) of high quality fixed? capacitors.

My bottom line is that accurate measurement becomes increasingly challenging for capacitors with values less than 100 pF and at frequencies below 10MHz or above 100MHz

One academic study bluntly concluded that a? VNA is unsuited to the task and several manufactures use other measurement instruments.

I have a 6-page summary of my efforts, let me know if you would like a copy if anyone

73 Ron W6WO