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Know your Standards. It is time to be specific.
19/04/2017

John Woodgate Adds another section to Know Your Standards                  

Know Your Standards

Time to be specific

Having looked in previous issues of KYS at  standards bodies and the ways that standards can be divided into types and classes, it's time to look at specific standards, and for EMC, the two biggies are CISPR 16 and IEC 61000-4, both divided into many Parts and Sections.

CISPR 16

This once was a standard of a modest 50 pages or so, but expanded to well over 100 and now is a multi-part standard with numerous sub-divisions. It is developed by CISPR/A -  Radio-interference measurements and statistical methods, except for CISPR TR 16-2-5 and TR 16-4-4, which are developed by CISPR/H.

There follows is a list of the current publications at the time of writing. The list is continually updated, and is freely available on the public part of the IEC web site. There is little point in citing one of the very long direct URLs, but you can drill down through the structure:

www.iec.ch -> Dashboard Finder -> Technical Committee -> CISPR/CIS/A -> Projects/Publications -> Publications

There you will find all the amendments and corrigenda, as well as details of bilingual (English/French) and monolingual (English, French or Spanish) editions, together with Stability Dates - the date before which no change to the standard is expected.

This search works for all IEC and CISPR technical committees and sub-committees, of course, not just for CISPR/A.

 Components of CISPR 16

A publication code such as CISPR 16-1-1 indicates:

CISPR - Originating body

16 - Publication number

1 - Part number

1- Section number

Note: Sub-divisions of the text of a standard are clauses, not sections or even chapters (which may be  a mistranslation from German).  Some standards with a long history still have 'chapters' as major divisions of the text.

A package of all of CISPR 16 can be purchased from IEC, but you have to be very rich:

CISPR 16:2015 OC

Edition 1.0 (2015-04-23) – ON-LINE COLLECTION – Specification for radio disturbance and immunity measuring apparatus and methods - ALL PARTS

Most people not in test houses need only selected publications. This list does not include 'RLV' red line versions, which show changes from the previous edition, and if there is a 'CSV'  consolidated version with amendments and/or corrigenda, the standard and its amendments and corrigenda are not listed separately.

CISPR 16-1-1:2015

 Edition 4.0 (2015-09-22) Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus

CISPR 16-1-2:2014

 Edition 2.0 (2014-03-21) Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-2: Radio disturbance and immunity measuring apparatus - Ancillary equipment - Conducted disturbances

CISPR 16-1-3:2004+AMD1:2016 CSV

 Edition 2.1 CSV (2016-03-31) Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-3: Radio disturbance and immunity measuring apparatus - Ancillary equipment - Disturbance power

CISPR 16-1-4:2010+AMD1:2012+AMD 2:2017 CSV

 Edition 3.2 (2017-01-19) Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test sites for radiated disturbance measurements

 CISPR 16-1-5:2014+AMD1 2016 CSV

 Edition 2.0 (2014-12-17) Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-5: Radio disturbance and immunity measuring apparatus - Antenna calibration test sites for 30 MHz to 1 000 MHz

 CISPR 16-2-1:2014

 Edition 3.0 (2014-02-26) Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-1: Methods of measurement of disturbances and immunity - Conducted disturbance measurements

CISPR 16-2-2010

Edition 2.0 (2010-07-28) Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-2: Methods of measurement of disturbances and immunity - Measurement of disturbance power

CISPR 16-2-3:2016

 Edition 4.0 (2016-09-15) Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance measurements

 CISPR 16-2-4:2003

 Edition 1.0 (2003-11-20) Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-4: Methods of measurement of disturbances and immunity - Immunity measurements

CISPR TR 16-2-5:2008 (developed by CISPR/H)

Edition 1.0 (2008-07-09) Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-5: In situ measurements for disturbing emissions produced by physically large equipment

 CISPR/TR 16-3:2010+AMD1:2012+AMD2:2015 CSV

 Edition 3.2 (2015-09-15) Specification for radio disturbance and immunity measuring apparatus and methods - Part 3: CISPR technical reports

CISPR/TR 16-4-1

Edition 2.0 (2009-02-23) Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-1: Uncertainties, statistics and limit modelling - Uncertainties in standardized EMC tests

CISPR 16-4-2:2011+AMD 1:2014 CSV

 Edition 2.1 (2014-02-14) Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-2: Uncertainties, statistics and limit modelling - Measurement instrumentation uncertainty

CISPR/TR 16-4-3:2004+AMD1:2006 CSV

 Edition 2.1 (2007-01-18) Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-3: Uncertainties, statistics and limit modelling - Statistical considerations in the determination of EMC compliance of mass-produced products

CISPR/TR 16-4-4:2007 (developed by CISPR/H)

Edition 2.0 (2007-07-16) Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-4: Uncertainties, statistics and limit modelling - Statistics of complaints and a model for the calculation of limits for the protection of radio services

CISPR/TR 16-4-5:2006+AMD1:2014 CSV

 Edition 1.1 (2014-07-21) Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-5: Uncertainties, statistics and limit modelling - Conditions for the use of alternative test methods

These publications have been written (and some repeatedly partly re-written) over the years by numerous people, so there are inconsistencies in language and style. CISPR intends to deal with this, but don't hold your breath!

The intention, also, is to collect into CISPR 16-1 and -2 all except the most specialized methods of measurement from other CISPR standards. Those that are worth retaining from CISPR 13, 20, 22 and 24 have already been included.

One point to beware of is the risky mixing in some of these standards of decibels and impedances in ohms. I pointed the problem out through BSI some years ago and it seemed to be accepted that a change was necessary, but later the comment was rejected. Even so, I believe it is valid. Consider :

V = IR

Convert to dB: the multiplier must clearly be 20 for all:

20lgV = 20lgI - 20lgR

Now consider:

W = V2/R

Convert to dB:

10lgW = 10lg(V2) - 10lgR

The multiplier must clearly be 10.

So, to convert 150 ohms to dB (which is needed as a correction factor in some calculations), do you multiply 2.18 by 10 or 20? Rather than mixing decibels with ohms, the correction can just be expressed as a number, explaining that it is derived from the 150 ohm impedance.

CISPR TR 16-3

This Technical Report is not widely known, but it is well worth study. It explains a lot about EMC and CISPR standards that isn't explained elsewhere. It isn't adopted by CENELEC, but it is published by BSI. Unfortunately, it is quite costly.

IEC 61000-4

This also needs a whole article to do it justice, so that will have to wait for the next issue.