In this video lectures i have explained the how to measure the AL factor (Inductance factor) of the unknown ferrite cores.
Inductance factor calculation formula is described in the video.
what is AL Inductance factor
It is the self-inductance that is generated in units of the winding of a coil with a given shape and dimensions wound on a magnetic core, as shown in the following formula.
It is normally represented in units of 10–9H (nH).
Here:
L : Self-inductance of the coil when there is a magnetic core (H)
N : Total number of turns of the coil