[Radio Wrangler]

Do not load the output.

Drive with 33kHz sine from a signal generator of some sort. Feed the primary VIA a variable resistor or a resistor substitution box

Use 2 channel scope.

Probe grounds to sig gen ground and its end of the primary

One probe to sig gen output, other probe to monitor voltage on primary.

Play with variable resistance until primaty voltage is 70.7% of sig gen voltage

Now the resistance = the inductor's reactance

Only now get out your multimeter and measure the resistance out of circuit.

R = 2*Pi*f*L

So L = R/(2*Pi*f)

Job's a good un.

David