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JJF 2077-2023 English PDF

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JJF 2077-2023: Calibration Specification for Microwave Power Bridges
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Basic data

Standard ID JJF 2077-2023 (JJF2077-2023)
Description (Translated English) Calibration Specification for Microwave Power Bridges
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 22,296
Date of Issue 2023-10-12
Date of Implementation 2024-04-12
Issuing agency(ies) State Administration for Market Regulation

JJF 2077-2023: Calibration Specification for Microwave Power 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.
National Metrology Technical Specifications of the People's Republic of China Microwave power bridge calibration specifications Released on 2023-10-12 Implemented on 2024-04-12 Released by the State Administration for Market Regulation Microwave power bridge calibration specifications Responsible unit: National Radio Measurement Technical Committee Main drafting unit: 203 Institute of the Second Academy of China Aerospace Science and Industry Corporation China Institute of Metrology Participating in the drafting unit: Xi'an Institute of Space Radio Technology The National Radio Measurement Technical Committee is entrusted with the interpretation of this specification: The main drafters of this specification: Yang Xujun (No: 203, Second Academy of China Aerospace Science and Industry Corporation) Chen Yunmei (No: 203, Second Hospital of China Aerospace Science and Industry Corporation) Li Yong (China Institute of Metrology) Participating drafters: Liu Ting (No: 203, Second Hospital of China Aerospace Science and Industry Corporation) Yuan Wenze (China Institute of Metrology) Cai Xiaohong (Xi'an Institute of Space Radio Technology)

Table of contents

Introduction(Ⅱ) 1 Scope(1) 2 Cited documents(1) 3 Overview(1) 4 Metering characteristics(1) 5 Calibration conditions(1) 5:1 Calibration environmental conditions(1) 5:2 Equipment for calibration(1) 6 Calibration items and calibration methods (2) 6:1 Appearance and working normality inspection (2) 6:2 Temperature control function check(2) 6:3 DC bias power(3) 6:4 Wheatstone Bridge Alternative Power(3) 6:5 Self-balancing bridge replacement power(4) 7 Calibration result expression(5) 8 Recalibration time interval(6) Appendix A Original record format (7) Appendix B Calibration Certificate Inner Page Format (8) Appendix C Example of calibration uncertainty assessment of major items (9)

Introduction

JJF 1071-2010 "Rules for Writing National Measurement Calibration Specifications" and JJF 1059:1-2012 "Measurement Uncertainty" Assessment and Expression" together constitute the basic series of specifications that support the preparation of this specification: This specification is released for the first time: Microwave power bridge calibration specifications

1 Scope

This specification applies to the calibration of microwave power Wheatstone bridges and self-balancing bridges:

2 cited documents

There are no referenced documents in this specification:

3 Overview

Microwave power bridges (power bridges for short) can be divided into Wheatstone bridges and self-balancing bridges according to their working principles: Power measurement can be described by the change in DC power: The change in DC power is called substitution power: Substitution power The efficiency is directly proportional to the high frequency or microwave power absorbed by the power base:

4 Metering characteristics

a) DC bias power: 30mW: Note: DC bias power is usually 29:3mW~30:7mW: b) Wheatstone bridge replacement power: 0:5mW~10mW; Maximum allowable error: ±(0:1%×P 5μW): c) Self-balancing bridge replacement power: 0:5mW~10mW; Maximum allowable error: ±(0:05%×P 0:5μW): Note: 1 The above technical indicators are not used to determine compliance and are only provided for reference: 2 P is the replacement power:

5 Calibration conditions

5:1 Calibration environmental conditions a) Ambient temperature: (23±5)℃; b) Relative humidity: ≤80%; c) Power supply: voltage (220±11)V, frequency (50±1)Hz; d) Others: There is no mechanical vibration or electromagnetic interference in the surrounding area that will affect the normal operation of the calibration system: The ambient temperature during calibration The change does not exceed ±2℃: 5:2 Equipment for calibration 5:2:1 Digital voltmeter (2 units) DC voltage measurement range: 1V~10V; Input resistance: not less than 10MΩ; Maximum allowable error of DC voltage: ±0:00085%:

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