GB/Z 17626.40-2025Electromagnetic compatibility - Testing and measurement techniques - Part 40: Digital methods for the measurement of power quantities of modulated or distorted signals (English PDF)

Foreword

This document is a report-type guidance technical document.

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

This document is Part 40 of GB/T (Z)17626, "Electromagnetic Compatibility Testing and Measurement Techniques". GB/T (Z)17626 has been published. The following parts were included.

---GB /Z 17626.1-2024 Electromagnetic compatibility testing and measurement techniques - Part 1: General principles of immunity testing;

---GB/T 17626.2-2018 Electromagnetic compatibility testing and measurement techniques - Electrostatic discharge immunity test;

---GB/T 17626.3-2023 Electromagnetic compatibility testing and measurement techniques - Part 3: Immunity to Radiated Radio Frequency Electromagnetic Fields test;

---GB/T 17626.4-2018 Electromagnetic compatibility testing and measurement techniques - Electrical fast transient/burst immunity test;

---GB/T 17626.5-2019 Electromagnetic compatibility testing and measurement techniques - Surge (impulse) immunity test;

---GB/T 17626.6-2017 Electromagnetic compatibility testing and measurement techniques - Conducted disturbance immunity induced by radio frequency fields;

---GB/T 17626.7-2017 Electromagnetic Compatibility Testing and Measurement Techniques - Measurement of Harmonics and Interharmonics in Power Supply Systems and Connected Equipment Guidelines for Measurement and Measuring Instruments;

---GB/T 17626.8-2006 Electromagnetic compatibility testing and measurement techniques - Power frequency magnetic field immunity test;

---GB/T 17626.9-2025 Electromagnetic compatibility testing and measurement techniques - Part 9: Pulse magnetic field immunity test;

---GB/T 17626.10-2017 Electromagnetic compatibility testing and measurement techniques - Damped oscillating magnetic field immunity test;

---GB/T 17626.11-2023 Electromagnetic compatibility testing and measurement techniques - Part 11: For input currents less than or equal to per phase Immunity tests for voltage dips, short interruptions, and voltage variations in 16A equipment;

---GB/T 17626.12-2023 Electromagnetic compatibility testing and measurement techniques - Part 12: Ringing wave immunity test;

---GB/T 17626.13-2006 Electromagnetic Compatibility Testing and Measurement Techniques - Harmonics, Interharmonics and Electromagnetic Waves at AC Power Ports Low-frequency immunity test of the number;

---GB/T 17626.14-2005 Electromagnetic compatibility testing and measurement techniques - Voltage fluctuation immunity test;

---GB/T 17626.15-2011 Electromagnetic Compatibility Testing and Measurement Technology - Functional and Design Specifications for Scintillation Meters;

---GB/T 17626.16-2007 Electromagnetic compatibility testing and measurement techniques - Common-mode conducted disturbance immunity (0Hz~150kHz) test;

---GB/T 17626.17-2005 Electromagnetic compatibility testing and measurement techniques - DC power supply input port ripple immunity test;

---GB/T 17626.18-2016 Electromagnetic compatibility testing and measurement techniques - Damped oscillating wave immunity test;

---GB/T 17626.19-2022 Electromagnetic compatibility testing and measurement techniques - Part 19: AC power supply ports 2kHz~ 150kHz differential-mode conducted interference and communication signal immunity test;

---GB/T 17626.20-2014 Electromagnetic Compatibility Testing and Measurement Techniques. Emission and Immunity in Transverse Electromagnetic Waveguides (TEM) Degree test;

---GB/T 17626.21-2014 Electromagnetic compatibility testing and measurement techniques - Mixing chamber test method;

---GB/T 17626.22-2017 Electromagnetic Compatibility Testing and Measurement Techniques - Radiated Emissions and Immunity in Anechoic Chambers Measurement;

---GB/T 17626.24-2012 Electromagnetic Compatibility Testing and Measurement Techniques - Testing of Conducted Disturbance Protection Devices for HEMP method;

---GB/T 17626.27-2006 Electromagnetic compatibility testing and measurement techniques - Three-phase voltage imbalance immunity test;

---GB/T 17626.28-2006 Electromagnetic compatibility testing and measurement techniques - Power frequency variation immunity test;

---GB/T 17626.29-2006 Electromagnetic Compatibility Testing and Measurement Techniques - DC Power Supply Input Port Voltage Drop, Short-Time Instantaneous Voltage Dips Immunity test under interruption and voltage variation;

---GB/T 17626.30-2023 Electromagnetic compatibility testing and measurement techniques - Part 30: Power quality measurement methods;

---GB/T 17626.31-2021 Electromagnetic compatibility testing and measurement techniques - Part 31: Broadband conducted noise at AC power ports Disturbance immunity test;

---GB /Z 17626.32-2025 Electromagnetic compatibility testing and measurement techniques - Part 32: High-altitude electromagnetic pulse (HEMP) mode Overview of simulators;

---GB /Z 17626.33-2023 Electromagnetic compatibility testing and measurement techniques - Part 33: Methods for measuring high-power transient parameters;

---GB/T 17626.34-2012 Electromagnetic Compatibility Testing and Measurement Techniques for Equipment with Main Power Supply Current Greater Than 16A Per Phase Voltage sag, short interruption and voltage change immunity tests;

---GB /Z 17626.35-2025 Electromagnetic compatibility testing and measurement techniques - Part 35: Overview of HEMP simulators;

---GB/T 17626.36-2024 Electromagnetic compatibility testing and measurement techniques - Part 36: Intentional electromagnetic interference in equipment and systems Disturbance immunity test methods;

---GB/T 17626.39-2023 Electromagnetic compatibility testing and measurement techniques - Part 39: Immunity to near-field radiated fields test; Numerical methods for measuring quantities.

This document is equivalent to IEC TR61000-4-40:2020 "Electromagnetic compatibility (EMC) - Part 4-40.Test and measurement techniques".

Digital methods for modulating or distorting electrical quantities of signals. The document type has been changed from an IEC technical report to a national standardization guidance document in my country. Technical documents. The following editorial changes have been made to this document.

---To align with my country's standards system, the standard title has been changed to "Electromagnetic Compatibility Testing and Measurement Techniques - Part 40: Measurement Modulation". or digital methods for measuring the electrical quantities of distorted signals.

Introduction

Electromagnetic compatibility (EMC) refers to the ability of electrical and electronic equipment or systems to function properly in their electromagnetic environment without posing a threat to anything in that environment.

The ability to withstand electromagnetic interference. Electromagnetic compatibility (EMC) issues are a significant factor affecting the environment and product quality, and standardization efforts have been undertaken.

This has attracted widespread attention both domestically and internationally. In this regard, the IEC 61000 series of standards developed by the International Electrotechnical Commission (IEC) are crucial for the manufacturing and information industries.

General standards in fields such as industry, electrical engineering and energy, transportation, social services and health, and consumer product quality and safety are divided into comprehensive standards.

The standards are categorized into six main types. description, environment, limits, testing and measurement techniques, installation and mitigation guidelines, and general standards. my country has already begun developing standards for this series.

Domestic transformation work has been carried out, and a corresponding national standard system has been established.

Within this standard system, GB/T (Z)17626 "Electromagnetic Compatibility Testing and Measurement Technology" pertains to testing and measurement in the field of electromagnetic compatibility.

The fundamental technical standards aim to describe immunity tests for electromagnetic compatibility phenomena such as conducted and radiated emissions, and are planned to be implemented by 40 organizations. Partial composition.

---Part 1: General Overview of Immunity Testing. The purpose is to provide usability guidelines for testing and measurement techniques in electromagnetic compatibility standards. It provides guidance and general advice on selecting relevant experiments.

---Part 2: Electrostatic Discharge Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating electrical and electronic equipment. Performance under electrostatic discharge.

---Part 3: Radio Frequency Electromagnetic Field Radiation Immunity Test. The purpose is to establish immunity standards for electrical and electronic equipment when exposed to radio frequency electromagnetic field radiation. The criteria for evaluating immunity.

---Part 4: Electrical Fast Transient/Bulk Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating electrical... Immunity of power supply ports, signal ports, control ports, and ground ports of electronic devices to electrical fast transient/burst interference. performance.

---Part 5: Surge (Impulse) Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating electrical and electronic... The equipment's immunity to surges (impacts).

---Part 6: Conducted Disturbance Immunity Induced by Radio Frequency Fields. The aim is to establish a universal and reproducible benchmark for evaluating electrical... Immunity performance of electronic devices when subjected to conducted disturbances induced by radio frequency fields.

---Part 7: Guidelines for the measurement of harmonics and interharmonics in power supply systems and connected equipment. The purpose is to specify the methods and instruments that can be used to measure harmonics and interharmonics in power supply systems and connected equipment.

The equipment was tested item by item according to the emission limits given by certain standards, and harmonic currents and voltages in the actual power supply system were also tested. Instruments for measuring line length.

---Part 8: Power Frequency Magnetic Field Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating residential, commercial, and... Immunity performance of industrial electrical and electronic equipment in power frequency (continuous and short-term) magnetic fields.

---Part 9: Pulsed Magnetic Field Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating residential, commercial, and... Immunity performance of industrial electrical and electronic equipment in pulsed magnetic fields.

---Part 10: Damped Oscillating Magnetic Field Immunity Test. The aim is to establish a universal and reproducible benchmark for evaluating medium- and high-voltage magnetic fields.

The disturbance rejection performance of electrical and electronic equipment in substations when exposed to damped oscillating magnetic fields.

---Part 11: Immunity Test for Voltage Sags, Short Interruptions and Voltage Variations for Equipment with Input Current Less Than or Equal to 16A Per Phase The purpose is to establish a universal and reproducible benchmark for evaluating the performance of electrical and electronic equipment under voltage dips and short-term interruptions. And the immunity performance against voltage changes.

---Part 12: Ringing Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating electrical and electronic equipment. It has the ability to resist ringing waves.

---Part 13: Low-frequency immunity test for AC power port harmonics, interharmonics, and mains signals. The purpose is to establish a universal... A reproducible benchmark is used to evaluate the low-frequency immunity performance of electrical and electronic equipment to harmonics, interharmonics, and grid signal frequencies.

---Part 14: Voltage Fluctuation Immunity Testing. The aim is to establish a universal and reproducible benchmark for evaluating electrical and electronic... The equipment's immunity performance when subjected to low-amplitude positive and negative voltage fluctuations.

---Part 15: Scintillation Meter Functionality and Design Specifications. The aim is to display accurate scintillation for all actual voltage fluctuation waveforms. Perceived level.

---Part 16: Common-mode conducted disturbance immunity test from 0Hz to 150kHz. The purpose is to establish the immunity of electrical and electronic equipment to common-mode conducted disturbances. General and repeatability criteria for modal conducted interference testing.

---Part 17: DC Power Supply Input Port Ripple Immunity Test. The purpose is to establish a universal and reproducible benchmark for... When electrical and electronic equipment is charged from sources such as rectifier systems and/or batteries under laboratory conditions, the DC power supply is superimposed. Immunity test of ripple voltage on the device.

---Part 18: Damped Oscillating Wave Immunity Test. The aim is to establish a universal and reproducible benchmark for evaluating electrical and electronic systems.

The disturbance rejection performance of the sub-device when subjected to damped oscillating waves.

---Part 19: AC power port 2kHz~150kHz differential mode conducted interference and communication signal immunity test. The purpose is to... Verify that electrical and electronic equipment can withstand the loads from sources such as power electronics and power line communication systems (PLCs) when operating under a public power grid. Differential-mode conducted interference, etc.

---Part 20: Transmission and Immunity Tests in Transverse Electromagnetic Waveguides (TEM). The aim is to provide performance data for TEM waveguides.

Verification methods for TEM waveguides used for electromagnetic compatibility testing, and test procedures for radiated emission and immunity testing in TEM waveguides. Test setup, steps, and requirements.

---Part 21: Mixing Chamber Test Methods. The aim is to establish methods for evaluating electrical and electronic equipment in radio frequency electromagnetic fields using a mixing chamber.

The general specifications for performance and determining the radiated emission levels of electrical and electronic equipment.

---Part 22: Measurement of Radiated Emissions and Immunity in a Fully Anechoic Chamber. The purpose is to specify the procedures for measurement within the same fully anechoic chamber.

General verification procedures for radiated emissions and radiated immunity, test setup requirements for the equipment under test, and measurement methods in a fully anechoic chamber.

---Part 23: Test Methods for HEMP and Other Radiated Disturbance Protection Devices. The purpose is to describe the basic principles of HEMP testing.

The principles, theoretical basis (test concept), test configuration, required equipment, test procedures, and data processing of protective component tests are explained. Important concept.

---Part 24: Test methods for HEMP conducted disturbance protection devices. The purpose is to specify the test methods for HEMP conducted disturbance protection devices.

The test methods include voltage breakdown and voltage limiting characteristic tests, as well as residual voltage tests under rapid voltage and current changes. Measurement methods.

---Part 25: HEMP Immunity Test Methods for Equipment and Systems. The aim is to establish a universal and reproducible benchmark for... When assessing the HEMP radiation environment and the conducted transient disturbances it generates on power, antenna, I/O signal lines, and control lines. The performance of electrical and electronic equipment.

---Part 27: Three-phase voltage imbalance immunity test. The purpose is to test the immunity of electrical and electronic equipment to unbalanced power supplies.

A reference is established for evaluating immunity to disturbances under pressure.

---Part 28: Power Frequency Variation Immunity Test. The purpose is to assess the immunity of electrical and electronic equipment to variations in power frequency. It provides a basis for immunity evaluation.

---Part 29: Immunity testing for DC power supply input port voltage sags, short interruptions, and voltage variations. The purpose is to establish... A general criterion for evaluating the immunity of DC electrical and electronic equipment to voltage dips, short interruptions and voltage changes.

---Part 30: Power Quality Measurement Methods. The purpose is to specify the methods for measuring power quality parameters in 50Hz AC power supply systems. And the interpretation of the measurement results.

---Part 31: Broadband Conducted Disturbance Immunity Testing at AC Power Ports. The aim is to establish a common benchmark for evaluating electrical... Immunity of AC power ports of electronic devices to conducted interference from intentional and/or unintentional broadband signal sources.

---Part 32: Overview of High Altitude Electromagnetic Pulse (HEMP) Simulators. The aim is to provide an overview of existing international system-level HEMP simulators.

Simulators and related information required for their use as immunity testing and verification devices.

---Part 33: Measurement Methods for High-Power Transient Parameters. The aim is to provide methods for measuring the waveforms of high-power electromagnetic transient responses. Information about the feature parameters.

---Part 34: Immunity tests for voltage dips, short interruptions and voltage variations of equipment with a main power supply phase current greater than 16A.

The aim is to establish a universal standard for evaluating the immunity of electrical and electronic equipment to voltage dips, short-term interruptions, and voltage variations. Guidelines.

---Part 35: Overview of HPEM Simulators. The aim is to provide internationally available system-level HPEM narrowband (narrow spectrum) and wideband simulators.

Includes (wideband, sub-ultrawideband, and ultrawideband) simulators and related equipment required for their use as immunity testing and verification devices. information.

---Part 36: Test methods for immunity to intentional electromagnetic interference from equipment and systems. The purpose is to assess the immunity of equipment and systems to intentional electromagnetic interference.

Immunity to electromagnetic interference sources provides a method for determining test levels.

---Part 37: Calibration and Verification Protocol for Harmonic Emission Compliance Test Systems. This protocol is intended for manufacturers, end-users, and independent... Laboratories and other organizations provide systematic guidance to define the applicable compliance status within a certain harmonic current emission range.

---Part 38: Test, Validation, and Calibration Protocol for Voltage Fluctuation and Scintillation Compliance Test Systems. The purpose is to provide a basis for type testing... The system of equipment provides guidelines and methods for regular verification and calibration.

---Part 39: Near-Range Radiation Field Immunity Testing. The aim is to establish a universal benchmark for evaluating exposure to near-range sources.

Immunity requirements for electrical and electronic equipment in radiated radio frequency electromagnetic fields.

---Part 40: Digital Methods for Measuring Electrical Quantities of Modulated or Distorted Signals. The aim is to introduce two methods applicable to fluctuating or non-periodic signals.

A digital algorithm for measuring electrical quantities under load is presented, and the working principle of the proposed algorithm is explained.

---Part 41: Broadband Radiated Immunity Testing. The purpose is to evaluate the immunity of electrical and electronic equipment to broadband radiated electromagnetic fields. Deflection establishes a universal benchmark.

1 Scope

This document is a guiding technical document that covers the evaluation of electrical quantities (root mean square RMS values of voltage, RMS values of current, and active power).

This document explains and compares two digital algorithms suitable for measuring electrical quantities under fluctuating or non-periodic loads. These examples are from 50Hz or... 60Hz power system.

This document does not attempt to cover all possible numerical methods for evaluating fluctuating load electrical quantities, such as those used in previous IEC documents.

The electromagnetic compatibility (EMC) assessment is described. Instead, it compares the averaging algorithm with one of the filtering algorithms. This document aims to highlight... Some application examples are introduced to illustrate how the algorithm works. Furthermore, guidance is provided for quantifying the accuracy of each method.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document.

IEC TR61000-1-7:2016 Electromagnetic compatibility (EMC) Part 1-7.Overview Power factor of single-phase systems under non-sinusoidal conditions

Note: GB /Z 17624.7-2023 Electromagnetic Compatibility Overview Part 7: Power Factor of Single-Phase Systems under Non-Sinusoidal Conditions (IEC TR61000-1-7. 2016, IDT)

3 Terms and Definitions

The terms and definitions defined in IEC TR61000-1-7 apply to this document.

The URLs for the terminology databases maintained by ISO and IEC for standardization are as follows.

The positive square root of the average of the squares of the quantity.

4 General Introduction

IEC TR61000-1-7:2016, 3.1 defines the root mean square (RMS) value as, for a time-dependent quantity, the root mean square value within a given time interval.

IEC TR61000-1-7:2016, 5.1.4 further specifies that the RMS value of voltage U (current I) is defined as an integer number of... The positive square root of the average value of the squares of the voltage u(t) [current i(t)] within the period kT. kTintegral tau kT [u(t)]2dt (1)