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JJF 1900-2021 English PDF

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JJF 1900-2021: Calibration Specification for Verification Instruments of Parking Timers
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JJF 1900-2021English529 Add to Cart 4 days [Need to translate] Calibration Specification for Verification Instruments of Parking Timers Valid JJF 1900-2021

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Standard similar to JJF 1900-2021

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Basic data

Standard ID JJF 1900-2021 (JJF1900-2021)
Description (Translated English) Calibration Specification for Verification Instruments of Parking Timers
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A57
Word Count Estimation 23,217
Issuing agency(ies) State Administration for Market Regulation

JJF 1900-2021: Calibration Specification for Verification Instruments of Parking Timers

---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.
Calibration Specification for Verification Instruments of Parking Timers National Metrology Technical Specifications of the People's Republic of China Calibration specification for parking lot electronic timing device verifier ParkingTimers Released on 2021-02-23 2021-08-23 implementation Issued by the State Administration for Market Regulation Electronic timing device for parking lot Calibration Specification for Verifier Focal point. National Technical Committee of Time and Frequency Measurement Main drafting unit. Dalian Institute of Metrology, Inspection and Testing Co., Ltd. Guizhou Metrology and Testing Institute Liaoning Institute of Metrology Participated in the drafting unit. Zhengzhou Quality and Technical Inspection and Testing Center Zhengzhou Xianda Electronic Technology Co., Ltd. This specification entrusts the National Time and Frequency Measurement Technical Committee to be responsible for the interpretation The main drafters of this specification. Zhao Xiaojun (Dalian Institute of Metrology, Inspection and Testing Co., Ltd.) Long Bo (Guizhou Metrology and Testing Institute) Jin Yuehong (Liaoning Institute of Metrology) Participating drafters. Yin Wenjie (Dalian Institute of Metrology, Inspection and Testing Co., Ltd.) Song Hao (Liaoning Institute of Metrology) Ke Cunrong (Zhengzhou City Quality and Technical Inspection and Testing Center) Haitao (Zhengzhou Xianda Electronic Technology Co., Ltd.)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Reference documents (1) 3 Overview (1) 4 Measurement characteristics (2) 4.1 Current moment (2) 4.2 second pulse (2) 4.3 Internal crystal oscillator (2) 4.4 Time interval(2) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Measurement standards and other equipment (2) 6 Calibration items and calibration methods (2) 6.1 Calibration items (2) 6.2 Calibration method (3) 7 Calibration result expression (5) 8 Recalibration interval (6) Appendix A Calibration Record Format (7) Appendix B Internal page format of calibration certificate (9) Appendix C Example of Uncertainty Evaluation of Calibration Results (10)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001-2011 "Tong Compiled with Metrological Terms and Definitions and JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty". This specification is released for the first time. Calibration specification for parking lot electronic timing device verifier

1 Scope

This specification applies to the calibration of the parking lot electronic timing device verifier.

2 Reference documents

The following documents are cited in this specification. JJF 1180 Time-frequency measurement terms and definitions For dated reference documents, only the dated version applies to this specification; for all undated references The latest version (including all amendments) is applicable to this specification.

3 overview

The parking lot electronic timing device verifier (hereinafter referred to as the "verifier") is used to calibrate the electronic parking meter toll Meters and metering devices for parking lot electronic timing toll devices. The verifier provides Micro Motion by receiving Global Navigation Satellite System (GNSS) satellite signals and decoding time information Accurate current time, and synchronize the local clock. When the GNSS satellite signal is not locked, the verifier will The previous time is provided by the local clock. The control unit of the verifier sends or receives a certain time interval through the sensor unit Start-stop signal, the time interval is measured by the timing unit to realize the verification of the timing error of the electronic timing device of the parking lot. At the same time, the control unit outputs the time interval at the "timing signal output terminal". The sensor units mainly include. manual start-stop keyboard, radio frequency controller, geo-sensing parking simulator and geomagnetic vehicle simulation Figure 1 Block diagram of the verification instrument 1PPS-second pulse signal output terminal; T-timing signal output terminal; f-internal crystal oscillator frequency signal output terminal

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