Bill Turner wrote:

Not only can you *not* measure them separately, they can not be
physically separated either, since the parasitic capacitance is always
present between adjacent windings. I would not call it an artifact of
the measurement method, but rather an artifact of the coil itself.

Agreed.

The inductance should be measured at whatever frequency you plan to use
the inductor, whether a single frequency or a wide band of frequencies.
Otherwise you risk a nasty surprise. To measure a coil at low frequency
and then label it as a "one microhenry" coil, for example, is asking for
trouble when that "one microhenry" coil is used at a higher frequency.
To be accurate, when you specify inductance you must also specify the
frequency of measurement.

Agreed. One usually specifies an inductor that is measured at a
higher frequency than the one being used.

(snip)

--
John Popelish