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neper
Symbol:  NP 
Category:  Logarithm of a ratio 
SI Equivalent:  4.34294 dB
Dimension nil (log) 
 
Notes
Named after the Scottish mathematician John Napier (also spelled Neper), the neper is a unit for expressing the ratio between two amounts of voltage or current. It is defined as logeV1/V2.
Convert     NP  
1 NP =
Logarithm of a ratio
  Symbol Unit Name
0.434294  B (power)  bel (power) 
0.868589  B (voltage)  bel (voltage) 
4.34294  dB (power)  decibel (power) 
8.68589  dB (voltage)  decibel (voltage) 
Glossary
Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

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A white paper to assist in the evaluation of 3D scanning hardware solutions.