GAR | GRBP-80-07/Rev.1

Document Number GRBP-80-07/Rev.1

1	2	3	4	5	6	7
Document title	Reference document: Measurement Uncertainties when testing
Date	18 Sep 2024				This document for reference might be applied to measurement procedures used in UN regulations of the Working Party on Noise and Tyres (GRBP). It supports the definition of limit values during the development of regulations by transparently presenting the measurement uncertainties embodied in the measurement procedures during type approval, conformity of production and other measurement reasons. Replaces GRBP/2024/08
Source(s)	Add source(s) of document, if applicable
Status	Informal GR review
Rulemaking area(s)	Add rule(s) if applicable
Meeting(s)	GRBP \| Session 80 \| 17-20 Sep 2024 Agenda item 3. UN Regulation No. 51 (Noise of M and N Categories of Vehicles)
Related documents
Related documents	GRBP/2024/8		Measurement uncertainties when testing in UN Regulations under the purview of GRBP (Formal GR review)
Downloads:		UNECE server		.pdf format	.docx format	GAR server
Excerpts from session reports related to this document
GRBP \| Session 80 \| 17-20 Sep 2024			9. The expert from the Informal Working Group on Measurement Uncertainties (IWG MU) presented a revised document for reference (GRBP-80-07-Rev.1) replacing ECE/TRANS/WP.29/GRBP/2024/8 considered at the previous session. The experts from the Netherlands, Switzerland, United Kingdom and EC expressed concerns over possible misinterpretation of the purpose and content of the document, in particular the suggested 3.5 dB(A) margin and the last sentence in paragraph 1.1.1. In the absence of a consensus, the Chair proposed to keep the document on the agenda of the next session as a working document.