JJF 1680-2017 English PDF

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JJF 1680-2017: Calibration Specification for Directional Coupler and SWR Bridges
Status: Valid

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Basic data

Standard ID: JJF 1680-2017 (JJF1680-2017)
Description (Translated English): Calibration Specification for Directional Coupler and SWR Bridges
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A57
Word Count Estimation: 22,228
Date of Issue: 2017-11-20
Date of Implementation: 2018-05-20
Older Standard (superseded by this standard): JJG 796-1992
Regulation (derived from): AQSIQ Notice 2017 No. 103
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine

JJF 1680-2017: Calibration Specification for Directional Coupler and SWR Bridges

---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.
(Directional couplers and VSWR calibration specifications) National Metrology Technical Specification of the People's Republic Directional Coupler and Standing Wave Ratio Bridge Calibration Specifications Released on.2017-11-20 2018-05-20 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Replace JJG796-1992 Focal Point. National Radio Measurement Technology Committee Main drafting unit. China Testing Technology Research Institute China Institute of Metrology Participated in the drafting unit. Wuxi Metrology and Testing Institute This Code entrusts the National Radio Measurement Technical Committee to explain The main drafters of this specification. Meng Linggang (China Testing Technology Research Institute) Liang Weijun (China Institute of Metrology) Participate in the drafters. Zhang Xuebo (China Testing Technology Research Institute) Jia Chao (China Institute of Metrology) Yan Haidong (Wuxi Metrology and Testing Institute)

table of Contents

Introduction (II) 1 Scope (1) 2 Overview (1) 3 Measurement characteristics (1) 3.1 Port Return Loss (1) 3.2 Insertion loss (1) 3.3 Reflection coefficient measurement range (only for standing wave ratio bridge) (1) 3.4 Coupling coefficient (1) 3.5 Directionality (1) 4 Calibration conditions (2) 4.1 Environmental conditions (2) 4.2 Measurement standards and other equipment (2) 5 Calibration items and calibration methods (2) 5.1 Calibration Project (2) 5.2 Calibration method (2) 6 Calibration result expression (5) 7 re-study interval (6) Appendix A Original Record Format (7) Appendix B Calibration Certificate Page Format (8) Appendix C Example of Uncertainty Evaluation of Measurement Results (9)

Introduction

This specification is prepared in accordance with JJF 1071-2010 “Rules for the Preparation of National Metrology Calibration Specifications” and is JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Representation" requirements assessment and representation of measurement uncertainty. Since the VSWR bridge works similarly to the directional coupler, the metering characteristics and calibration methods are the same, so This specification incorporates the calibration of the directional coupler. This specification replaces JJG796-1992 "Regulations for the verification of high frequency standing wave ratio bridges". Compared with JJG796-1992, The main technical changes are as follows. --- Increase the calibration method of the directional coupler; --- Removed the calibration method of the test port standing wave ratio; --- Modified the frequency measurement range from the original 1.3GHz to 18GHz; --- Modified the directional calibration method; --- Increased calibration method for port return loss; --- Increased the calibration method of insertion loss; --- Added calibration method for reflection coefficient measurement; --- Increased the calibration method of the coupling coefficient. The previous versions of this procedure were released as follows. ---JJG796-1992. Directional Coupler and Standing Wave Ratio Bridge Calibration Specifications

1 Scope

This specification applies to the calibration of directional couplers and standing wave ratio bridges in the frequency range from 300 kHz to 18 GHz. For calibration of VSWR bridges and directional couplers in other frequency bands, refer to this method.

2 Overview

The principle of directional coupler is shown in Figure 1. The ports are input, output and coupling. When the signal is input When the terminal is connected, the coupling end has a coupled output, which is forward transmission of the directional coupler, and the directional coupler is equivalent to unevenness. The power splitter, the ratio of coupled output power to input power is defined as the coupling factor. Working principle and setting of standing wave ratio bridge Similar to the coupler, except for the coupling coefficient, isolation, directionality measurement method, and calculation formula and directional coupler phase In addition, the reflection coefficient measurement function has been added. Directional couplers are used for signal isolation, separation and mixing, and are widely used in microwave and millimeter wave fields. Standing wave ratio The bridge is mainly used to measure the reflection characteristics of circuits, and is widely used in broadcasting, television, antennas and various communication equipment. Measurement of reflection characteristics. Figure 1 Directional coupler forward transmission schematic

3 Measurement characteristics

3.1 Port Return Loss 15dB~60dB. 3.2 Insertion loss ≤3dB. 3.3 Reflection coefficient measurement range (only for standing wave ratio bridge) 0~1.0. 3.4 Coupling coefficient 10dB~40dB. 3.5 Directionality 20dB~50dB. ......

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