AS/NZS 61000.4.7:1999
Electromagnetic compatibility (EMC) - Testing and measurement techniques - General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto
Provides guidance on the instrumentation intended for measuring voltage or current components with frequencies in the range of d.c. to 2500 Hz which are superimposed on the voltage or current at the power supply frequency. The Standard also provides guidance on measurement instrumentation intended for testing individual items of equipment in accordance with emission limits given in Standards as well as for the measurement of harmonic voltages and currents in actual supply systems. Frequency domain and time domain instrumentation are both considered in this Standard. This Standard is technically equivalent to and has been reproduced from IEC 61000-4-7:1991.
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AS/NZS 61000.4.7:1999 ELECTROMAGNETIC COMPATIBILITY (EMC) - TESTING AND MEASUREMENT TECHNIQUES-GENERAL GUIDE ON HARMONICS AND
PREFACE
CONTENTS
1 Scope
2 Normative references
3 Definitions, symbols and indices
3.1 voltage
3.2 current
3.3 definitions related to harmonics:
3.4 interharmonics:
3.5 frequency-domain instrumentation:
3.6 time-domain instrumentation:
3.7 Symbols
3.8 Indices
4 General classification of instrumentation
4.1 Characteristics of the signal to be measured
4.2 Accuracy classes of instrumentation
4.3 Types of measurement
5 Common requirements for all types of instrumentation
5.1 Requirements for input circuits
5.1.1 Voltage input circuit
5.1.2 Current input circuit
5.2 Accuracy requirements for instruments
5.3 Accuracy requirements for external voltage- and current-transformers
6 Special requirements for frequency-domain instrumentation
6.1 General
6.2 Quasi-stationary harmonics
6.3 Fluctuating harmonics
6.4 Rapidly changing harmonics
6.5 Output requirements
7 Special requirements for time-domain instrumentation
7.1 Fast Fourier Transform (FFT) instrumentation - General concepts
7.1.1 Quasi-stationary harmonics
7.1.2 Fluctuating and rapidly changing harmonics
7.2 Digital filters
7. 3 Operation-mode and output requirements
8 Evaluation methods
8.1 Output signal filtering
8.1.1 Low-pass filter for frequency-domain instruments
8.1.2 Filter for time-domain instruments
8.2 Future methods
9 Voltage harmonic surveys in supply systems
9.1 Types of measurement equipment
9.2 Window- width and basic requirements for FFT- instrumentation
9.3 Time ranges for statistical handling of measured values
9.3.1 Very-short-time interval (first integrating time range)
9.3.2 Short-time interval (second integrating time range)
9.3.3 Long-time interval (third integrating time range)
9.3.4 Day interval (24 h)
9.3.5 Week or longer interval
10 Special cases of measurement
10.1 Phase-angle measurement
10.2 Distortion measurements
10.2.1 Distortion factors
10.2.2 Psophometric weighting
10.3 Symmetrical components measurement
10.4 Interharmonics measurement
11 Effect of environment - Immunity tests
11.1 Temperature and humidity
11.2 Instrument supply voltage
11.3 Common mode interference voltage
11.4 Static electricity discharges
11.5 Electromagnetic fields
Annex A - Bibliography
Annex ZZ - List of variations to IEC 61000-4-7:1991 for application in Australia and New Zealand
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AS/NZS 61000.4.7:1999 ELECTROMAGNETIC COMPATIBILITY (EMC) - TESTING AND MEASUREMENT TECHNIQUES-GENERAL GUIDE ON HARMONICS AND
PREFACE
CONTENTS
1 Scope
2 Normative references
3 Definitions, symbols and indices
3.1 voltage
3.2 current
3.3 definitions related to harmonics:
3.4 interharmonics:
3.5 frequency-domain instrumentation:
3.6 time-domain instrumentation:
3.7 Symbols
3.8 Indices
4 General classification of instrumentation
4.1 Characteristics of the signal to be measured
4.2 Accuracy classes of instrumentation
4.3 Types of measurement
5 Common requirements for all types of instrumentation
5.1 Requirements for input circuits
5.1.1 Voltage input circuit
5.1.2 Current input circuit
5.2 Accuracy requirements for instruments
5.3 Accuracy requirements for external voltage- and current-transformers
6 Special requirements for frequency-domain instrumentation
6.1 General
6.2 Quasi-stationary harmonics
6.3 Fluctuating harmonics
6.4 Rapidly changing harmonics
6.5 Output requirements
7 Special requirements for time-domain instrumentation
7.1 Fast Fourier Transform (FFT) instrumentation - General concepts
7.1.1 Quasi-stationary harmonics
7.1.2 Fluctuating and rapidly changing harmonics
7.2 Digital filters
7. 3 Operation-mode and output requirements
8 Evaluation methods
8.1 Output signal filtering
8.1.1 Low-pass filter for frequency-domain instruments
8.1.2 Filter for time-domain instruments
8.2 Future methods
9 Voltage harmonic surveys in supply systems
9.1 Types of measurement equipment
9.2 Window- width and basic requirements for FFT- instrumentation
9.3 Time ranges for statistical handling of measured values
9.3.1 Very-short-time interval (first integrating time range)
9.3.2 Short-time interval (second integrating time range)
9.3.3 Long-time interval (third integrating time range)
9.3.4 Day interval (24 h)
9.3.5 Week or longer interval
10 Special cases of measurement
10.1 Phase-angle measurement
10.2 Distortion measurements
10.2.1 Distortion factors
10.2.2 Psophometric weighting
10.3 Symmetrical components measurement
10.4 Interharmonics measurement
11 Effect of environment - Immunity tests
11.1 Temperature and humidity
11.2 Instrument supply voltage
11.3 Common mode interference voltage
11.4 Static electricity discharges
11.5 Electromagnetic fields
Annex A - Bibliography
Annex ZZ - List of variations to IEC 61000-4-7:1991 for application in Australia and New Zealand
AS/NZS 61000.4.7:1999
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.