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Re: Step by step on measuring inductor and self resonance

 

VNA must to be calibrated to perform any measurement. You measure at reference plane no matter the internal impedance of VNA , this is the part of magic of this instrument.

Ing. Patricio A. Greco
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T: +5411-4455-2557 ( tel:+5411-4455-2557 )
F: +5411-4032-0072 ( tel:+5411-4032-0072 )
www.servicios-electronicos.com ( http://www.servicios-electronicos.com/ )


On 13 Dec 2024, at 00:22, Brian Beezley via groups.io
<k6sti@...> wrote:


 I think the best way to measure inductor self-resonant frequency is to
place it between the VNA ports and find the transmission loss peak. Using
just a single port parallels its capacitance with the inductor. This can
greatly affect measured SRF. For example, the measured capacitance of 1.9
pF for port 1 of a NanoVNA-H4 exceeds the 1.2 pF calculated
self-capacitance of a 10 uH air-wound coil. SRF will measure 28.7 MHz
instead of the true 46.1 MHz. No VNA calibration is needed for this
measurement.

Brian
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