Explanation some technical terms for magnetic component(3)

Inductance tolerance
Standard inductance tolerances are typically designated by a tolerance letter, standard inductance tolerance letters include:
F:+/-1%
G:+/-2%
T:+/-3%
J:+/-5%
K:+/-10%
L:+/-15%
M:+/-20%
P:+/-25%
N:+/-30%

Test frequency
The frequency at which inductors are tested for either inductane or Q or both,some test fequencies used widely in the industry include:
1KHz power inductors( wide value range)
79.6K inductors(above 10000uH to 100000uH
252K inductors(above 1000uH to 10000uH)
796K inductors( above 100uH to 1000uH)
2.52M inductors(above 10uH to 100uH)
7.96M inductors(above 1uH to 10uH)
25.2M inductors(above 0.1uH to 1uH)
50M inductors(above 0.01uH to 0.1uH)
Most of these test frequencies have been designated by military specifications, however there are some conflicting frequency assignments among the military specifications, there is present trend to assign test frequencies that match the user frequencies, this is particularly true for evry low values, these user frequencies do not match those listed above.

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