Process for measuring transformer coupling coefficient, k, using SimSmith, for a FT114-61 Ferrite Toroid core with 10T #22, close spaced, on opposite ends of the core.
AIM-4170D bench setup for measuring coil inductance. Also pictured are the OSL devices used to calibrate to the SO-239.
Set up VNA such that the measurement is taken close to Xs = 50 Ohms.
Ls = 9.9738 uH
A trial and error step was performed to find a capacitor value which matches the leakage inductance of the device. The selected load is a 47 pF capacitor in series with a 49.9 Ohm load resistor. This step is required to keep the measurements within range of the VNA.
Using a "coupled" SimSmith transformer block, adjust k for best match to measurement.
k = 0.6
|Lopen (L1 with L2 Open)||10.0047||804||50|
|Lshort (L1 with L2 Short)||6.1366||1315||50|
|Ladd (L1 add L2)||32.679||246||50|
|Lopp (L1 oppose L2)||8.6192||939||50|
|Ladd (L1 add L2)||32.427||2000||407|
|Lopp (L1 oppose L2)||8.562||2000||108|
|Ladd (L1 add L2)||198||300||373|
|Lopp (L1 oppose L2)||9.63||300||18|
SimSmith model with S21 and S11 plot overlays