The cores are
manufactured to the AL values listed;
the permeability for each material is for reference
only. Toroidal cores are tested with an
evenly-spaced full single-layer winding in order to
minimize leakage effects. Iron powder cores tested
with a small number of turns which are not evenly
distributed will produce higher inductance readings
than expected.
The saturation
curves have a typical tolerance ±10%. The core
loss curves have a typical tolerance of
±25%.
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