Class 1 Sound Level Meter NL-53 / Class 2 Sound Level Meter NL-43
with Extended Function Program NX-43EX Instruction Manual Operation Guide

2 Terminology and Notation

Correspondence table between measurement quantity notation and measurement quantity name based on the standard

The table shows the correspondence between the measurable NL-43/NL-53 notations and the measurement quantity names according to standards (IEC 61672-1, ISO 1996).

  • The device does not distinguish between “sound level” and “sound pressure level” with or without frequency weighting; it simply indicates “sound level.”
  • Regarding the quantifiers Lp, Lmax, Lmin, and LN, the expression is independent of time weighting (F, S, I).
NL-43/NL-53 notation Measurement quantity name
Measurement quantity setting Frequency weighting Time weighting
F S I
NX-43EX
Lp
Time-weighted sound level		 A LAF LAS LAI A-weighted and time-weighted sound level
C LCF LCS LCI C-weighted and time-weighted sound level
Z LZF LZS LZI Z-weighted and time-weighted sound level
Leq
Equivalent continuous sound level		 A LAeq - A-weighted equivalent continuous sound level
A-weighted time-averaged sound level
- LAIeq I-time-weighted equivalent continuous sound level
C LCeq C-weighted equivalent continuous sound level
C-weighted time-averaged sound level
Z LZeq Z-weighted equivalent continuous sound level
Z-weighted time-averaged sound level
Leq,mov
Moving Leq
NX-43EX		 A LAeq,mov A-weighted moving Leq
C LCeq,mov C-weighted moving Leq
Z LZeq,mov Z-weighted moving Leq
LE
Sound exposure level		 A LAE A-weighted sound exposure level
C LCE C-weighted sound exposure level
Z LZE Z-weighted sound exposure level
Lmax
Maximum time-weighted sound level		 A LAFmax LASmax LAImax Maximum A-weighted and time-weighted sound level
C LCFmax LCSmax LCImax Maximum C-weighted and time-weighted sound level
Z LZFmax LZSmax LZImax Maximum Z-weighted and time-weighted sound level
Lmin
Minimum time-weighted sound level		 A LAFmin LASmin LAImin Minimum A-weighted and time-weighted sound level
C LCFmin LCSmin LCImin Minimum C-weighted and time-weighted sound level
Z LZFmin LZSmin LZImin Minimum Z-weighted and time-weighted sound level
LN
N percentage exceedance sound level		 A LAFN LASN LAIN N percentage exceedance A-weighted sound level
C LCFN LCSN LCIN N percentage exceedance C-weighted sound level
Z LZFN LZSN LZIN N percentage exceedance Z-weighted sound level
Lpeak
Peak sound level		 A LApeak A-weighted peak sound level
C LCpeak C-weighted peak sound level
Z LZpeak Z-weighted peak sound level
Ltm5
Takt-max sound level		 A LAtm5 - Takt-max A-weighted sound level
C - Takt-max C-weighted sound level
Z - Takt-max Z-weighted sound level

Correspondence between measurement quantity notation and quantifier notation for each standard

The table shows the correspondence between the measurable NL-43/NL-53 notations and the quantifiers for each standard (IEC 61672-1, ISO 1996).

  • JIS Z 8731 is based on ISO 1996, but since there are some differences in the quantifier notation, the relevant sections are listed separately.
  • Regarding the quantifiers Lp, Lmax, Lmin, and LN, the notation of time weighting (F, S, I) is omitted.
    • NL-43/NL-53 notation Quantifiers for each standard
    Measurement quantity setting Frequency weighting Quantifier IEC 61672-1
    （JIS C 1509-1）    		 ISO 1996 JIS Z 8731
    Lp
    Time-weighted sound level    		 A LA LA LpA
    C LC LC -
    Z LZ LZ Lp
    Leq
    Equivalent continuous sound level    		 A LAeq  LAeq,T LAeq,T /LAeq
    LIeq  -  - 
    C LCeq - -
    Z LZeq - -
    Leq,mov
    Moving Leq
    NX-43EX    		 A LAeq,mov - -
    C LCeq,mov - -
    Z LZeq,mov - -
    LE
    Sound exposure level    		 A LAE LAE,T /LAE LEA LEA,T /LEA
    C LCE LCE -
    Z LZE LZE -
    Lmax
    Maximum time-weighted sound level    		 A LAmax LAmax LAmax LpA,max
    C LCmax LCmax LCmax -
    Z LZmax LZmax -
    Lmin
    Minimum time-weighted sound level    		 A LAmin - -
    C LCmin - -
    Z LZmin - -
    LN
    N percentage exceedance sound level    		 A LAN - LAN,T
    C LCN - -
    Z LZN - -
    Lpeak
    Peak sound level    		 A LApeak - -
    C LCpeak LCpeak -
    Z LZpeak - -
    Ltm5
    Takt-max sound level    		 A LAtm5 - -
    C - - -
    Z - - -

    Please scroll left and right to see the table.