Class 1 Sound Level Meter (with low-frequency sound measurement function) NL-63 Instruction Manual Operation Guide

2 Terminology and Notation

Quantifiers and their names with Sound Level Meter NL-63

Depending on whether the device has frequency weighting, there is no distinction between sound level and sound pressure level, with them both treated as the sound level.

Notation and
name with NL-63		 Frequency
weighting		 Measurement value Time weighting
F-weighting S-weighting 10 s I-weighting
Lp
Sound pressure
level		 A-weighting A-weighted sound pressure level LAF LAS LA10s LAI
C-weighting C-weighted sound pressure level LCF LCS LC10s (LCI)
Z-weighting Z-weighted sound pressure level LZF LZS LZ10s (LZI)
G-weighting G-weighted sound pressure level LGF LGS LG10s (LGI)
Leq
Equivalent
continuous
sound level		 A-weighting Equivalent continuous A-weighted
sound level		 LAeq –
I-time-weighted equivalent
continuous sound level		 – LAIeq
C-weighting Equivalent continuous C-weighted
sound level		 LCeq –
Z-weighting Equivalent continuous Z-weighted
sound level		 LZeq –
G-weighting Equivalent continuous G-weighted
sound level		 LGeq –
LE
Sound
exposure level		 A-weighting A-weighted sound exposure level LAE –
C-weighting C-weighted sound exposure level LCE –
Z-weighting Z-weighted sound exposure level LZE –
G-weighting G-weighted sound exposure level LGE –
Lmax
Maximum
sound level
(Same for Lmin)		 A-weighting Maximum A-weighted sound level LAFmax LASmax LA10smax LAImax
C-weighting Maximum C-weighted sound level LCFmax LCSmax LC10smax (LCImax)
Z-weighting Maximum Z-weighted sound level LZFmax LZSmax LZ10smax (LZImax)
G-weighting Maximum G-weighted sound level LGFmax LGSmax LG10smax (LGImax)
LN
Percentile
sound level		 A-weighting Percentile A-weighted sound level LAFN LASN LA10sN (LAIN)
C-weighting Percentile C-weighted sound level LCFN LCSN LC10sN (LCIN)
Z-weighting Percentile Z-weighted sound level LZFN LZSN LZ10sN (LZIN)
G-weighting Percentile G-weighted sound level LGFN LGSN LG10sN (LGIN)
Lpeak
Peak sound
level		 A-weighting A-weighted peak sound level (LApeak) –
C-weighting C-weighted peak sound level LCpeak –
Z-weighting Z-weighted peak sound level LZpeak –
G-weighting G-weighted peak sound level (LGpeak) –
Leq, mov
Moving Leq		 A-weighting A-weighted moving Leq LAeq,mov –
C-weighting C-weighted moving Leq LCeq,mov –
Z-weighting Z-weighted moving Leq LZeq,mov –
G-weighting G-weighted moving Leq LGeq,mov –
Ltm5
Takt-max
sound level		 A-weighting Takt-max A-weighted sound level LAtm5 – – –
C-weighting Takt-max C-weighted sound level – –
Z-weighting Takt-max Z-weighted sound level – –
G-weighting Takt-max G-weighted sound level – –

Please scroll left and right to see the table.

Note

  • There is no combination of Peak sound level / Sound exposure level / moving Leq and I-weighting.
  • Measured quantities in parentheses are not commonly used.
  • Although the indication on the device is τ, it is written here as 10 s.

The notation of quantifiers in international standards and JIS with Sound Level Meter NL-63

Quantifiers are taken from ISO 1996, IEC 61672-1, JIS C 1509-1 and JIS Z 8731.

Notation and name with NL-63 Frequency
weighting		 ISO 1996
notation		 JIS C 1509-1
(IEC 61672-1) notation		 JIS Z 8731
notation
LA
A-weighted sound level		 A-weighting LpA - LpA
LC
C-weighted sound level		 C-weighting - - -
LZ
Sound level		 Z-weighting Lp - Lp
LAeq
Equivalent continuous
A-weighted sound level		 A-weighting LAeq,T LAeq,T LAeq,T
LCeq
Equivalent continuous
C-weighted sound level		 C-weighting - - -
LZeq
Equivalent continuous sound level		 Z-weighting - - -
LAE
A-weighted Sound exposure level		 A-weighting LEA LAE,T LEA
LCE
C-weighted Sound exposure level		 C-weighting - - -
LZE
Z-weighted Sound exposure level		 Z-weighting - - -
LAN LA5
5% Percentile A-weighted
sound level		 A-weighting LAN,T LA5,T - LAN,T LA5,T
LA10
10% Percentile A-weighted
sound level		 LA10,T - LA10,T
LA50
50% Percentile A-weighted
sound level		 LA50,T - LA50,T
LA90
90% Percentile A-weighted
sound level		 LA90,T - LA90,T
LA95
95% Percentile A-weighted
sound level		 LA95,T - LA95,T
LAmax
Maximum A-weighted sound level		 A-weighting LpA,max LAmax LpAmax
LAmin
Minimum A-weighted sound level		 A-weighting - - -
LCpeak
C-weighted peak sound level		 C-weighting - LCpeak -

Please scroll left and right to see the table.