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Stimulus Span change a bit the Smith measurement

 

Hi All

SEESII H4 + 1.2.40 measuring a Ferrit inductance gives a little different values depend on stimulus span selected :

50Khz..30Mhz (calibrated with same load 401 point) ---> 0.100 Ohm + j 26.88 Ohm ==> Q = 268
13.5Mhz .. 14.5Mhz (calibrated with same load 401 point) ---> 0.200 Ohm + j 26.88 Ohm ==> Q= 134

NanoVNA-F gives same for both stimulus spans but ---> 0.400 Ohm + j 26.88 Ohm ==> Q= 67

can you explaine that , and which is the more accurate measurement ??

it's important to decide which inductance have the better Q coeff

Thanks
73's Nizar

narrow band measure.jpg
wide band measure.jpg

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