For Neper as a mythological god, see
Neper (mythology), for the lunar crater named Neper, see
Neper (crater), and for the Scottish mathematician, phycisist and astronomer, see
John Napier. A neper (Symbol: Np) is a unit of
ratio. It is not an
SI unit but is accepted for use alongside the SI. It is used to express ratios, such as
gain and loss, and relative values. The name is derived from
John Napier, the inventor of logarithms.
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[Egyptian] An Egyptian god of grain who was particularly associated with barley and emmer wheat.
A unit used to express ratios, such as
gain,
loss, and relative values. Note 1: The neper is analogous to the decibel, except that the Naperian base 2.718281828. . . is used in computing the ratio in nepers. Note 2: The value in nepers, Np , is given by Np = ln(x 1/x 2), where x 1 and x 2 are the values of interest, and ln is the natural logarithm, i.e., logarithm to the base e. (
188 ) Note 3: One neper (Np) = 8.686
dB, where 8.686 = 20/(ln 10). Note 4: The neper is often used to express voltage and current ratios, whereas the decibel is usually used to express
power ratios. Note 5: Like the dB, the Np is a dimensionless unit. Note 6: The ITU recognizes both units.
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