Convert Centinepers to Millinepers

Convert Centinepers (cNp) to Millinepers (mNp) instantly and accurately.

Conversion Formula

mNp = cNp × 10

About Centinepers

The centineper (cNp) is one-hundredth of a neper (1 cNp = 0.01 Np ≈ 0.08686 dB). In fibre-optic engineering, next-generation ultra-low-loss G.654.E optical fibre achieves below 0.15 dB/km ≈ 1.73 cNp/km at 1550 nm. Transmission-line textbooks (Pozar, Collin) use nepers per metre for the attenuation constant α; the centineper resolves sub-1-dB precision commonly needed in filter and amplifier characterisation. In underwater acoustics, seawater absorption at 100 kHz (relevant for high-frequency sonar) is ≈ 0.04 dB/m ≈ 4.6 × 10⁻³ cNp/m (ISO 18405). In hearing science, adaptive psychophysical procedures probe detection thresholds at 0.1 dB step sizes ≈ 1.15 cNp, precision necessary to map fine structure in the auditory threshold contour. 1 cNp = 0.01 Np ≈ 0.08686 dB ≈ 8.686 × 10⁻³ B.

About Millinepers

The millineper (mNp) equals one-thousandth of a neper (1 mNp = 10⁻³ Np), representing a level change of (20/ln(10)) × 10⁻³ ≈ 0.008686 dB. In transmission-line theory, the attenuation constant α (Np/m) is expressed in millinepers per metre (mNp/m) for modern low-loss coaxial and twisted-pair cables. Standard single-mode optical fibre (ITU-T G.652.D) has an attenuation coefficient of ≈ 0.2 dB/km ≈ 23.04 mNp/km at 1550 nm. A standard ITU-T hypothetical reference circuit (HRC) of 27,500 km was allocated 13.0 Np total attenuation, averaging about 0.47 mNp/km. The gap between normal hearing (0 dB HL) and mild impairment (25 dB HL) spans ≈ 2,876 mNp, while the JND of ≈ 0.25 dB ≈ 28.8 mNp is resolvable by trained listeners. 1 mNp = 10⁻³ Np ≈ 0.008686 dB = 8.686 × 10⁻⁴ B.

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