ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-7: TESTING AND MEASUREMENT TECHNIQUES - GENERAL GUIDE ON HARMONICS AND INTERHARMONICS MEASUREMENTS AND INSTRUMENTATION, FOR POWER SUPPLY SYSTEMS AND EQUIPMENT CONNECTED THERETO
International Electrotechnical Committee
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions, symbols and indices
3.1 Definitions related to frequency analysis
3.2 Definitions related to harmonics
3.3 Definitions related to distortion factors
3.4 Definitions related to interharmonics
3.5 Notations
3.5.1 Symbols
3.5.2 Subscripts
4 General concepts and common requirements for
all types of instrumentation
4.1 Characteristics of the signal to be measured
4.2 Accuracy classes of instrumentation
4.3 Types of measurement
4.4 General structure of the instrument
4.4.1 Main instrument
4.4.2 Post-processing parts
5 Harmonic measurements
5.1 Current input circuit
5.2 Voltage input circuit
5.3 Accuracy requirements
5.4 Measurement set-up and supply voltage
5.4.1 Measurement set-up for emission assessment
5.4.2 Supply voltage for emission assessment
5.4.3 Equipment power
5.5 Assessment of harmonic emissions
5.5.1 Grouping and smoothing
5.5.2 Compliance with emission limits
5.6 Assessment of voltage harmonic subgroups
6 Other analysis principles
7 Transitional period
8 General
Annex A (informative) - Measurement of interharmonics
Annex B (informative) - Measurements above the harmonic
frequency range up to 9 kHz
Annex C (informative) - Technical considerations for
grouping method
Bibliography
Applies to instrumentation intended for measuring spectral components in the frequency range up to 9 kHz which are superimposed on the fundamental of the power supply systems at 50 Hz and 60 Hz.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 77 |
