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JJF 1761-2019 English PDF

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US$969.00 · In stock
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JJF 1761-2019: Calibration Specification for Selective Level Meters
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1761-2019	969	Add to Cart	7 days	Calibration Specification for Selective Level Meters	Valid

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Basic data

Standard ID: JJF 1761-2019 (JJF1761-2019)
Description (Translated English): Calibration Specification for Selective Level Meters
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A56
Classification of International Standard: 17.220
Word Count Estimation: 42,446
Date of Issue: 2019
Date of Implementation: 2020-03-27
Issuing agency(ies): State Administration for Market Regulation

JJF 1761-2019: Calibration Specification for Selective Level Meters

---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 Selective Level Meters National Measurement Technical Specification of the People's Republic of China Calibration Specification for Frequency Selective Level Meter 2019-09-27 release 2020-03-27 Implementation Issued by the State Administration of Market Supervision and Administration Calibration Specification for Frequency Selective Level Meter Replace JJG777-1992 Focal point. National Radio Measurement Technical Committee Main drafting unit. Shanghai Institute of Metrology and Testing Technology First institute of telecommunication science and technology Participated in the drafting unit. Sichuan Meishan Jianhua Electronic Instrument Co., Ltd. China Information and Communication Research Institute This specification is entrusted to the National Radio Measurement Technical Committee for interpretation The main drafters of this specification. Zhiqiang Zhan (Shanghai Institute of Metrology and Testing Technology) Ling Wei (First Institute of Telecommunication Science and Technology) Yu Lei (Shanghai Institute of Metrology and Testing Technology) Participating drafters. Li Bide (First Institute of Telecommunication Science and Technology) Tang Yu (Sichuan Meishan Jianhua Electronic Instrument Co., Ltd.) Huang Zhen (China Information and Communication Research Institute)

Introduction (Ⅱ) 1 Scope (1) 2 Overview (1) 3 Measurement characteristics (1) 3.1 Level measurement (1) 3.2 Frequency measurement (1) 3.3 Frequency selection bandwidth (2) 3.4 Selectivity (stop band attenuation) (2) 3.5 IF suppression (2) 3.6 Image suppression (2) 3.7 Intrinsic distortion (2) 3.8 Combined interference in the aircraft (2) 3.9 Noise floor (2) 3.10 Input balance (input longitudinal interference) (2) 3.11 Return loss (2) 4 Calibration conditions (2) 4.1 Environmental conditions (2) 4.2 Measurement standards and other equipment (2) 5 Calibration items and calibration methods (4) 5.1 Calibration items (4) 5.2 Calibration method (4) 6 Expression of calibration results (13) 7 Recalibration time interval (13) Appendix A Original Record Format (14) Appendix B. Internal page format of the calibration certificate (21) Appendix C Examples of Uncertainty Evaluation of Calibration for Major Projects (28)

Introduction

This specification is based on JJF 1071-2010 "Rules for Compiling National Measurement and Calibration Specifications" and JJF 1059.1-2012 Compilation of "Measurement Uncertainty Evaluation and Representation". This specification is revised based on JJG777-1992 "Frequency Selection Level Meter", compared with JJG777-1992, In addition to editorial changes, the main technical changes in this specification are as follows. --- The upper frequency limit is increased from 30MHz to 150MHz; --- standardized the name of the calibration project; --- According to the different level display methods, the corresponding technical indicators and calibration methods are refined; --- Added the calibration method for unbalanced input level measurement under different nominal input impedances; --- Modify the calibration method of frequency measurement; --- Modify the calibration method of 0dBm level; --- Modified the calibration method of the meter scale; --- Modify the attenuation calibration method; --- Modify the calibration method of return loss; --- Modify the calibration method of input balance (input longitudinal interference); --- Decompose the original selective measurement index into two indexes. frequency selection bandwidth and selectivity (stop band attenuation). --- Appendix C gives an example of the uncertainty assessment method for level measurement. Previous releases of this specification. --- JJG777-1992. Calibration Specification for Frequency Selective Level Meter

1 Scope

This specification applies to the calibration of frequency selective level meters with an upper frequency limit of 150MHz. The receiving part of the transmission tester The calibration can be performed by reference.

2 Overview

The frequency selection level meter is constructed according to the principle of superheterodyne, which realizes the level measurement within the selected bandwidth and has the level measurement standard Features such as high accuracy and wide level measurement range. Frequency selection level meter can be divided into pointer type frequency selection level meter and digital indication selection Frequency level meter, frequency selection level meter has two measurement functions of broadband and frequency selection, usually the input port has balanced input and unbalanced Enter two types. Frequency selection level meters are mainly used for the manufacture, installation, maintenance and testing of communication equipment, and the transmission of high-frequency signals in power systems. It is widely used in level measurement in scientific research and production.

3 Measurement characteristics

3.1 Level measurement 3.1.1 Digital indication frequency selection level meter Measuring range. -110dBm ~ 20dBm (input impedance 75Ω); Maximum allowable error. ± (0.15 ~ 2.0) dB. 3.1.2 Pointer frequency selection level meter a) Zero level (0dBm) Basic error. ± (0.1 ~ 0.2) dB (reference frequency 1kHz); Frequency response. ± (0.2 ~ 0.5) dB. b) attenuation Range. (0 ~ 70) dB; Basic error. ± 0.2dB (reference frequency 1kHz); Frequency response. ± (0.2 ~ 0.5) dB. c) Head scale Range. (-20 ~ 10) dBm; Maximum allowable error. ± (0.2 ~ 0.5) dB. 3.2 Frequency measurement 3.2.1 Balanced input Frequency range. 20Hz ~ 2MHz; Maximum allowable error. ± (1 × 10-3 ~ 1 × 10-6). 3.2.2 Unbalanced input Frequency range. 20Hz ~ 150MHz; ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1761-2019_English be delivered?

Answer: Upon your order, we will start to translate JJF 1761-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 7 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1761-2019_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1761-2019_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.