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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