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

Quantifiers and their names with Sound Level Meter NL-43/NL-53

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-43/NL-53	Frequency weighting	Measurement value	Time weighting
Notation and name with NL-43/NL-53	Frequency weighting	Measurement value	F-weighting	S-weighting	I-weighting
L_p Sound pressure level	A-weighting	A-weighted sound pressure level	L_AF	L_AS	L_AI
	C-weighting	C-weighted sound pressure level	L_CF	L_CS	(L_CI)
	Z-weighting	Z-weighted sound pressure level	L_ZF	L_ZS	(L_ZI)
L_eq Equivalent continuous sound level	A-weighting	Equivalent continuous A-weighted sound level	L_Aeq		–
	A-weighting	I-time-weighted equivalent continuous sound level	–		L_AIeq
	C-weighting	Equivalent continuous C-weighted sound level	L_Ceq		–
	Z-weighting	Equivalent continuous Z-weighted sound level	L_Zeq		–
L_E Sound exposure level	A-weighting	A-weighted sound exposure level	L_AE		–
	C-weighting	C-weighted sound exposure level	L_CE		–
	Z-weighting	Z-weighted sound exposure level	L_ZE		–
L_max Maximum sound level (Same for L_min)	A-weighting	Maximum A-weighted sound level	L_AFmax	L_ASmax	L_AImax
	C-weighting	Maximum C-weighted sound level	L_CFmax	L_CSmax	(L_CImax)
	Z-weighting	Maximum Z-weighted sound level	L_ZFmax	L_ZSmax	(L_ZImax)
L_N Percentile sound level	A-weighting	Percentile A-weighted sound level	L_AFN	L_ASN	(L_AIN)
	C-weighting	Percentile C-weighted sound level	L_CFN	L_CSN	(L_CIN)
	Z-weighting	Percentile Z-weighted sound level	L_ZFN	L_ZSN	(L_ZIN)
L_peak Peak sound level	A-weighting	A-weighted peak sound level	(L_Apeak)		–
	C-weighting	C-weighted peak sound level	L_Cpeak		–
	Z-weighting	Z-weighted peak sound level	L_Zpeak		–
L_{eq, mov} Moving L_eq	A-weighting	A-weighted moving Leq	L_Aeq,mov		–
	C-weighting	C-weighted moving Leq	L_Ceq,mov		–
	Z-weighting	Z-weighted moving Leq	L_Zeq,mov		–
L_tm5 Takt-max sound level	A-weighting	Takt-max A-weighted sound level	L_Atm5	–	–
	C-weighting	Takt-max C-weighted sound level	–		–
	Z-weighting	Takt-max Z-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 L_eq and I-weighting.
Measured quantities in parentheses are not commonly used.

The notation of quantifiers in international standards and JIS with Sound Level Meter NL-43/NL-53

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

Notation and name with NL-43/NL-53		Frequency weighting	ISO 1996 notation		JIS C 1509-1 (IEC 61672-1) notation	JIS Z 8731 notation
L_A A-weighted sound level		A-weighting	L_pA		-	L_pA
L_C C-weighted sound level		C-weighting	-		-	-
L_Z Sound level		Z-weighting	L_p		-	L_p
L_Aeq Equivalent continuous A-weighted sound level		A-weighting	L_Aeq,T		L_Aeq,T	L_Aeq,T
L_Ceq Equivalent continuous C-weighted sound level		C-weighting	-		-	-
L_Zeq Equivalent continuous sound level		Z-weighting	-		-	-
L_AE A-weighted Sound exposure level		A-weighting	L_EA		L_AE,T	L_EA
L_CE C-weighted Sound exposure level		C-weighting	-		-	-
L_ZE Z-weighted Sound exposure level		Z-weighting	-		-	-
L_AN	L_A5 5% Percentile A-weighted sound level	A-weighting	L_AN,T	L_A5,T	-	L_AN,T	L_A5,T
	L_A10 10% Percentile A-weighted sound level			L_A10,T	-		L_A10,T
	L_A50 50% Percentile A-weighted sound level			L_A50,T	-		L_A50,T
	L_A90 90% Percentile A-weighted sound level			L_A90,T	-		L_A90,T
	L_A95 95% Percentile A-weighted sound level			L_A95,T	-		L_A95,T
L_Amax Maximum A-weighted sound level		A-weighting	L_pA,max		L_Amax	L_pA,max
L_Amin Minimum A-weighted sound level		A-weighting	-		-	-
L_Cpeak C-weighted peak sound level		C-weighting	-		L_Cpeak	-

Please scroll left and right to see the table.