Im working in a transformer manufacturing company as a quality engineer.i tried it many ways 2 bring the waveform but i was fail.. we can get it from core maker btu we waant 2 check whether the supplier is providing the correct details or not.ericgibbs thanks 4 ur info.
The other option is to measure it yourself. Where I used to work, we had a PAR vibrating sample magnetometer which we used to characterize the magnetic properties of the thin films we made. They're not cheap though.