AS/NZS 3548:1995

1 - AS/NZS 3548:1995 LIMITS AND METHODS OF MEASUREMENT OF RADIO DISTURBANCE CHARACTERISTICS OF INFORMATION TECHNOLOGY EQUIPMENT
4 - PREFACE
6 - CONTENTS
7 - INTRODUCTION
8 - 1 Scope and object
8 - 2 Normative references
9 - 3 Definitions
9 - 3.1 Information Technology Equipment (ITE)
9 - 3.2 equipment under test (EUT)
9 - 3.3 host unit
9 - 3.4 module
9 - 3.5 identical modules and ITE
9 - 4 Classification of ITE
9 - 4.1 Class B ITE
10 - 4.2 Class A ITE
10 - 5 Limits for conducted disturbance
10 - 5.1 Limits for conducted disturbance at mains ports
11 - 5.2 Limits for conducted disturbance at telecommunication ports
11 - 6 Limits for radiated disturbance
12 - 7 Limits for disturbance power
12 - 8 Interpretation of CISPR radio disturbance limit
12 - 8.1 Significance of a CISPR limit
12 - 8.2 Application of limits in ests for conformity of equipment in series production
13 - 9 General measurement conditions
14 - 9.1 EUT configuration
16 - 9.1.1 Determination of maximum emission configuration(s)
17 - 9.1.2 EUTconfiguration with ground-plane
17 - 9.2 Operation of the equipment under test (EUT)
17 - 9.2.1 Operation of visual display units
17 - 9.2.2 Operation of facsimile devices
18 - 9.2.3 Operation of telephone sets
18 - 10 Method of measurement of conducted disturbance at mains ports
18 - 10.1 Measuring receivers
18 - 10.2 Artificial Mains Network (AMN)
20 - 10.3 Ground-plane
20 - 10.4 Equipment set-up for conducted disturbance measurements
20 - 10.5 Recording of conducted disturbance measurements
20 - 11 Method of measurement of radiated disturbance
21 - 11.1 Measuring receivers
21 - 11.2 Antenna
21 - 11.2.1 Antenna-to-EUT distance
21 - 11.2.2 Antenna-to-ground distance
22 - 11.2.3 Antenna-to-EUT azimuth
22 - 11.2.4 Antenna-to-EUTpolarization
22 - 11.3 Measurement site for radiated disturbance measurements
22 - 11.3.1 General
22 - 11.3.2 Site attenuation measurements
22 - 11.3.3 Open-area test site
22 - 11.3.4 Conducting ground-plane
22 - 11.3.5 Alternative test sites
23 - 11.3.6 User installation testing
23 - 11.4 Equipment set up for radiated disturbance tests
23 - 11.5 Recording of radiated disturbance measurements
23 - 11.6 Measurement in the presence of high ambient signals
24 - 12 Measurement of disturbance power
37 - Annex A - Site attenuation measurements of alternative test sites
37 - A.1 Method of measurement of site attenuation
37 - A.1.1 Vertical polarization
38 - A.1.2 Horizontal polarization
42 - A.2 References

Specifies limits of electromagnetic emissions in the frequency range 9 kHz to 400 GHz from information technology equipment and provides methods for the measurement of those emissions. It is one of a series of Standards specifying limits and measurement techniques to control electromagnetic interference. It is identical with has been reproduced from IEC/CISPR 22:1993.

This standard applies to ITE as defined in 3.1.Procedures are given for the measurement of the levels of spurious signals generated by the ITE and limits are specified for the frequency range 9 kHz to 400 GHz for both Class A and Class B equipment. No measurements need be performed at frequencies where no limits are specified.The intention of this standard is to establish uniform requirements for the radio disturbance level of the equipment contained in the scope, to fix limits of disturbance, to describe methods of measurement and to standardize operating conditions and interpretation of results.

First published in Australia as AS 3548-1988.
Jointly revised and designated AS/NZS 3548:1992.
Third edition 1995.