NIS method for uncertainty estimation of airborne sound insulation measurement in field | International Journal of Metrology and Quality Engineering (IJMQE)

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Table 1

Error sources and the determination of standard uncertainties contributions [14].

Source of error (parameter)	Denotation	Standard uncertainty contribution	Distribution type
Sound level meter frequency weighting function Z	δ_PFE		Normal
	It is the correction associated with electric calibration of SLM	function Z deviation at given frequency
	U_E is uncertainty of electrical calibration (from certificate)
Microphone frequency response	δ_PFA		Normal
	It is the correction associated with acoustic calibration of SLM	is characteristics of a standard deviation for a given frequency
		U_A is uncertainty of acoustics calibration (from certificate)
Directional microphone characteristic ±90° from the reference direction	δ_PMS		Rectangular
	It is the due to microphone calibration	Δ_MS is the maximum deviation from a standardized characteristics for a given frequency, (from certificate)	Rectangular
Linearity of amplitude characteristics of sound level meter	δ_LS	u(δ_LS) = S_L	Normal
Linearity of amplitude characteristics of sound level meter	It is the correction depending on the linearity of SLM	S_L is linearity's standard deviation [16]	Normal
Time weighting (RMS detector)	δ_RMS	u(δ_RMS) = S_R	Normal
Time weighting (RMS detector)	It is the assessment of the ability of rms detector	S_R is detector's standard deviation (from certificate)	Normal
Time weighting (fast)	δ_PT		Rectangular
Time weighting (fast)	It is the correction due to time weighting (fast, slow)	Δ_PT is maximum deviation, (from certificate)	Rectangular
Display resolution	δ_ES		Rectangular
Display resolution	It is the effect of the finite resolution of SLM	E_s is determined by display resolution	Rectangular
Influence of ambient temperature	δ_TS		Rectangular
Influence of ambient temperature	Effect of temp.	α_M is temperature coefficient, [15]	Rectangular
Influence of static pressure changes	δ_PS		Rectangular
Influence of static pressure changes	Variations in the atmospheric pressure	γ_M is pressure coefficient, [15]	Rectangular

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