An electrical unit similar to decibel, used to express the ratio between two amounts of power existing at two distinct points. A neper is 8.686 decibels.
Basic unit of a logarithmic scale used for the expression of ratios of voltages, currents, and similar quantities.
a unit expressing the ratio of two numbers as a natural logarithm; the ratio corresponds to (1/2) ln nepers. Quantities differ by 1 neper if one is e2 = 7.389056 times the other. One neper is equal to about 8.685 890 decibels, and in general nepers equal 20/(ln 10) decibels. The neper is accepted for use with SI units, and it may become an SI unit in the future. The unit recognizes the Scottish mathematician John Napier (1550-1617), the inventor of the logarithm (Napier often spelled his name Jhone Neper, and he used the Latin form Ioanne Napero in his writings).
A logarithmic unit used for expressing the ratio of two voltages.
The analogue of the decibel, utilizing natural logarithms rather than logarithms to the base 10. It is given by the relation , where 1 and 2 are flux densities. One neper is equal to 8.686 decibels.
A measure of power equal to one-half the Napierian logarithm (logarithm to the base ) of the power ratio. 1 neper is equal to 8.686 decibels. Under certain conditions the neper is a measure of the ratio of amplitudes of such physical quantities as voltage, current, particle velocities, and sound pressure. The neper is not commonly used in English-speaking countries.
A neper (Symbol: Np) is a unit of ratio. It is not an SI unit but is accepted for use alongside the SI.