How DC Bias current helps inductor testing?

Ferromagnetic materials (like iron) are composed of microscopic regions called magnetic domains. The stronger the external magnetic field H, the more the domains align, yielding a higher magnetic flux density B. Eventually, The magnetization remains nearly constant, and is said to have saturated. The domain structure at saturation depends on the temperature.

What is magnetic saturation?

In electronic circuits, transformers and inductors with ferromagnetic cores operate nonlinearly when the current through them is large enough to drive their core materials into saturation. This means that their inductance and other properties vary with changes in drive current. In linear circuits this is usually considered an unwanted departure from ideal behavior.

Magnetic saturation current is called Isat, and the temperature rise current is called I rms. When the transformer and the inductor pass a large current in the actual circuit operation, the magnetic field of the magnetic core will produce magnetic saturation, which will cause the inductance characteristic to decline.
Therefore, the R&D engineer will set the current value of the inductance reduction allowable range.

Isat (Magnetic saturation current curve)

Irms (Rated current curve)

Using a DC Bias current source to apply a 200A bias current to the inductor, the inductance decreased from 2.06983uH to 1.02845uH.

Equivalent Circuit Analysis (Option)

It has seven different models, combine with different types of parameters ( R, L, C) help customers model the impedance versus frequency characteristics and self-resonant frequency (SRF).

Magnetic Material Test Fixture (FX-0000C8)

Using the magnetic material test fixture for measuring of permeability of various toroidal cores or ferrite cores and electromagnetic shielding coating materials, 6632 built-in formula to directly calculate the permeability coefficient value μr.

List Mode

50 groups of list mode setting (Each group contains up to 15 steps).