Here you have to decide on the size of the ring and its type.

If the Dimensions button is active, you can select a core from the drop-down list when the Auto button is active. Please note that you can read the information (if any) about the cores loaded into the list by clicking the Info button.

The cores loaded into the list can be of two types — ferrite or other. The ferrite contains only the size of the cores, and the remaining parameters are calculated on the basis of them. In other (non-ferrite) cores, in addition to the dimension, information on the Al (inductance coefficient) and DCB of the core can be included.

For example, the application contains several ready-made files such as ferrite and other. How to create a file that contains information about the rings themselves, see the help topic using the resource Editor.

To load other cores into the drop-down list, use the LOAD button.

As with the active button Dimensions and Hand, you can set the toroidal ferrite core dimensions manually in the format outside diameter-inside diameter-height.

If the Phys. charact. button is active, then you are asked to enter from the datasheet such parameters of the ferrite core as the effective cross-sectional area of the core and the effective length of the midline.

Note that in this mode, you can take the parameters not only toroidal ferrite core, and in general any (eg ELP).

Also in this functional group you can specify the number of cores in the appropriate input field.