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JJG 921-2021: (Verification Regulations of Environmental Vibration Analyzer)
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JJG 921-2021	English	279	Add to Cart	3 days [Need to translate]	(Verification Regulations of Environmental Vibration Analyzer)
JJG 921-1996	English	559	Add to Cart	3 days [Need to translate]	Verification Regulation of Noise. Vibration meter For measuring Envrionmental pollution

JJG 921-2021: (Verification Regulations of Environmental Vibration Analyzer)

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(Verification Regulations of Environmental Vibration Analyzer) People's Republic of China National Metrological Verification Regulations Environmental Vibration Analyzer Published on 2021-07-28 2022-01-28 Implementation Released by the State Administration for Market Regulation Environmental Vibration Analyzer Verification Regulations Replacing JJG 921-1996 Focal Point. National Technical Committee of Vibration and Shock Speed Measurement Main drafting unit. China Institute of Metrology Hangzhou Aihua Instrument Co., Ltd. Participating in the drafting unit. Shaanxi Institute of Metrology Hubei Institute of Metrology and Testing Technology This regulation entrusts the National Technical Committee of Vibration and Shock Speed Measurement to be responsible for the interpretation The main drafters of this regulation. Zuo Aibin (China Institute of Metrology) Zhang Ning (Hangzhou Aihua Instrument Co., Ltd.) Participating drafters. Zheng Huihui (Shaanxi Institute of Metrology) Yang Lifeng (China Institute of Metrology) Liu Aidong (China Institute of Metrology) Xu Aihua (Hubei Institute of Metrology and Testing Technology)

content

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms (1) 4 Overview(1) 5 Measurement performance requirements (2) 5.1 Overall Sensitivity(2) 5.2 Frequency weighted response error(2) 5.3 Amplitude linearity error(2) 5.4 Statistical vibration level (optional) (2) 6 General technical requirements (2) 6.1 Appearance(2) 6.2 Reset(2) 6.3 Accessories (2) 7 Measuring Instrument Control(2) 7.1 Verification Conditions (3) 7.2 Verification items (3) 7.3 Verification method (3) 7.4 Verification result processing (5) 7.5 Verification Period(5) Appendix A Frequency Weighted Response and Maximum Allowable Error(6) Appendix B Verification Certificate Inner Page Format (8) Appendix C Format of the Inner Page of the Notification of Verification Result (9)

Introduction

This regulation is based on JJF1002-2010 "National Metrological Verification Regulations" and JJG 921-1996 "public Compared with JJG 921-1996, the main technical changes except editorial revision as follows. --- Change the name of the regulations "Public Noise Vibration Meter" to "Environmental Vibration Analyzer"; --- Deleted the test requirements and information about the noise part; --- Added introduction, scope, reference documents, terms and definitions, general technical requirements; --- The relative response of table A.1 vibration measurement frequency-weighted characteristic at 6.3Hz whole body horizontal direction response -8.84dB changed to -6.84dB; --- Added appendix A, changed appendix 1 and appendix 2 of the original regulations to appendix B and appendix C, and deleted the original appendix Record 3. The previous versions of this regulation have been released as follows. ---JJG 921-1996. Environmental Vibration Analyzer Verification Regulations

1 Scope

This regulation is applicable to the initial verification, subsequent verification and Check in use.

2 Reference documents

This regulation cites the following documents. JJF1001-2011 General Metrology Terms and Definitions GB/T 10071-1988 Measurement method of environmental vibration in urban areas GB/T 23716-2009 Measuring instrument for human body's response to vibration For dated citations, only the dated version applies to this Regulation; for undated citations The latest version (including all amendments) applies to this regulation.

3 Terminology

The terms and definitions defined in JJF1001-2011 and GB/T 23716-2009 and the following terms and definitions apply to this regulation. La The base 10 logarithm of the ratio of the acceleration to the reference acceleration multiplied by 20 is the decibel (dB), given by the following formula gives. La=20lg a0 (1) where. a ---effective value of measured acceleration, m/s2; a0---reference acceleration, a0=1×10-6m/s2. Lw The vibration level, in decibels (dB), obtained from the weighted acceleration aw, is given by. Lw =20lg aw a0 (2) where. aw---weighted acceleration, m/s2.

4 Overview

An environmental vibration analyzer is a measuring instrument used to measure environmental vibration, consisting of a vibration sensor, a host (including ...