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JJG 948-2018 English PDF

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Q: Should I purchase the latest version JJG 948-2018?

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US$809.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 948-2018: Electrodynamic Vibration Testing Systems
Status: Valid

JJG 948: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 948-2018	809	Add to Cart	6 days	Electrodynamic Vibration Testing Systems	Valid
JJG 948-1999	RFQ	ASK	5 days	Verification regulation of digital electrodynamic vibration testing system	Obsolete

Similar standards

JJG 882 GB/T 36126 GB/T 1885 JJG 126 JJG 944 JJG 942

Basic data

Standard ID: JJG 948-2018 (JJG948-2018)
Description (Translated English): Electrodynamic Vibration Testing Systems
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Word Count Estimation: 35,336
Date of Issue: 2018-02-27
Date of Implementation: 2018-08-27
Older Standard (superseded by this standard): JJG 948-1999; JJG 190-1997
Quoted Standard: JJF 1156; GB/T 7670-2009
Regulation (derived from): AQSIQ Announcement No. 26 of 2018
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine

JJG 948-2018: Electrodynamic Vibration Testing Systems

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Electrical vibration test system verification procedures) National Metrology Verification Regulations of the People's Republic Electric vibration test system Published on.2018-02-27 2018-08-27 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Electric vibration test system verification procedures Replace JJG 948-1999 JJG 190-1997 Focal Point. National Vibration Shock Velocity Measurement Technical Committee Main drafting unit. AVIC Beijing Great Wall Metrology and Testing Technology Research Institute China Institute of Metrology Participated in the drafting unit. Beijing Zhongyuan Huan Test Electromechanical Equipment Technology Co., Ltd. Suzhou Dongling Vibration Test Instrument Co., Ltd. Suzhou Su Test Equipment Co., Ltd. The Fifth Institute of Electronics, Ministry of Industry and Information Technology This regulation entrusts the National Vibration Shock Velocity Measurement Technical Committee to explain The main drafters of this specification. Wang Xianwei (China Aviation Industry Beijing Great Wall Measurement and Testing Technology Research Institute) Zeng Wu (China Aviation Industry Beijing Great Wall Metrology and Testing Technology Research Institute) Cai Chenguang (China Institute of Metrology) Participate in the drafters. Zhang Yue (Beijing Zhongyuan Huan Test Electromechanical Equipment Technology Co., Ltd.) Jiang Yuntai (Suzhou Dongling Vibration Test Instrument Co., Ltd.) Li Ping (Suzhou Su Test Equipment Co., Ltd.) Zheng Shuli (Electronics Fifth Institute of the Ministry of Industry and Information Technology)

Introduction (II) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Metrology performance requirements (1) 4.1 Vibration Controller (1) 4.2 Sinusoidal vibration (2) 4.3 Random vibration (3) 4.4 Sinusoidal plus broadband random vibration (5) 4.5 Narrowband Random Plus Wideband Random Vibration (5) 4.6 Classic Impact (5) 5 General technical requirements (5) 5.1 Appearance requirements (5) 5.2 Other technical requirements (5) 6 measuring instrument control (6) 6.1 Verification conditions (6) 6.2 Verification project (6) 6.3 Verification method (7) 6.4 Processing of verification results (17) 6.5 Verification cycle (17) Appendix A Test of Random Signals (18) Appendix B Certification Certificate Page Format (22) Appendix C Format of the results of the verification result notice (24) Appendix D Verification Record Format (25)

Introduction

This procedure is based on JJF1002-2010 “Rules for the preparation of national metrological verification procedures”. This procedure is correct JJG 948-1999 has been revised to cover the content of JJG 190-1997. To meet GB/T 2423 Environmental Testing Standards for Industrial Electronic Products and GJB150A Environmental Testing Methods for Military Equipment In addition to the editorial changes, the main technical changes in this procedure are as follows. --- Change the original name "Digital Electric Vibration Test System" to "Electric Vibration Test System"; --- Cancel the limitation of the vibration table thrust in the original procedure; --- Increased the requirements for random vibration table top uniformity and lateral vibration ratio; --- Part of the measurement performance requirements have been adjusted. This procedure replaces JJG 948-1999 and JJG 190-1997. The previous versions of JJG 190-1997 were released. ---JJG 190-1987. Electric vibration test system verification procedures

1 Scope

This procedure is applicable to the first verification, subsequent verification and making of the electric vibration test system (hereinafter referred to as the test system). Check in use.

2 reference files

This procedure refers to the following documents. JJF1156 Vibration Shock Velocity Measurement Terms and Definitions GB/T 7670-2009 Electric vibration generating system (equipment) Performance characteristics For dated references, only the dated version applies to this Code; any undated quotation The latest version (including all amendments) applies to this procedure.

3 Overview

The electric vibration test system is used to generate different vibration and shock excitations according to the test standard requirements (such as sinusoidal vibration). Dynamic, random vibration, sinusoidal plus wideband random vibration, narrowband random plus wideband random, classical shock, shock response spectrum Etc.) Dynamic mechanical environment testing equipment. As shown in Figure 1, it is usually composed of a digital vibration controller, electric vibration It consists of a station, a power amplifier, a control accelerometer and other ancillary equipment. Figure 1 Schematic diagram of the test system

4 Metrological performance requirements

This procedure covers the measurement performance requirements of various functions of the test system, if the test system is only partially For functions, performance verification must be performed on all functions contained in the system. For example, if there is only a sinusoidal vibration function, it must be All sinusoidal vibration functions are checked for performance. 4.1 Vibration controller 4.1.1 The vibration controller has the frequency indication error in the specified frequency range as shown in Table 1. Table 1 Frequency indication error Frequency range A grade B grade C grade f < 100Hz ±0.05Hz ±0.1Hz ±0.5Hz f ≥100Hz ±0.05% ±0.1% ±0.5% ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 948-2018_English be delivered?

Answer: Upon your order, we will start to translate JJG 948-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 948-2018_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 948-2018_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version JJG 948-2018?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 948-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.