Dear LF Group,
One needs to be slightly cautious about this type of measurement - the
inductance meter measures at a frequency somewhere in the LF range which
depends on the inductance being measured - in general, this frequency will
not be the same as the intended operating frequency of the loop. The
inductance of the loop is fairly frequency dependent due to distributed
capacitance, skin and eddy current effects, so the value at the measuring
frequency will not be exactly the same as at the operating frequency. This
is likely to give only very small errors for moderately sized, single turn
LF loops, but could be serious for multi-turn loops with high inductance
and stray capacitance, very large loops, or loops for use at MF or HF.
Measurement methods which resonate the inductor at the intended operating
frequency would then be highly desirable, although more cumbersome.
Cheers, Jim Moritz
73 de M0BMU
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