Measure the inductance of one inductor with the other inductor not connected to anything. The square root of the ratio of inductances is the turns ratio and k accounts for the fact that not all the flux is coupled. V1 and V2 are the inductor voltages and L1 and L2 are the inductances with nothing else connected to the inductors. Either inductor can be driven with the other one measured and the resulting value of k was virtually the same. The source voltage must be a low impedance and the measurement voltage made at high impedance. Refer to the drawing above and apply a voltage across one inductor and measure the open circuit voltage across the second inductor. ![]() However depending on whether k is near 0 or 1 will determine which method is easier and more accurate. There are 2 ways to measure the coefficient of coupling between 2 inductors and both yielded similar results for moderate values of the coefficient of coupling (k).
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