2010 Standards update

(Note, this list is not exhaustive. It includes only those items which directly affect EMC emissions test systems as supplied by Laplace).

There are 3 changes of note:


EN55022 (ITE Equipment) upper frequency limit

EN55022:2006 went into effect in the EU on 1st October 2009.
One of the items introduced in amendment A1:2007 to this new issue of the standard is an extension of the frequency range to 6GHz. This amendment applies from 1st October 2010. After that date, compliance with this requirement is a mandatory part of CE marking.
In detail, the maximum frequency that must be measured for compliance will be:

Maximum internally generated signal
(eg clock signal) 

 Upper frequency to be measured
for CE compliance

 Up to 108MHz

 1GHz

 108 - 500MHz

 2GHz

 500MHz - 1GHz

 5GHz

 1GHz +

 6GHz


And the limits for the range from 1GHz to 6GHz are:

Frequency
range 

 

 Class B ITE

Class A ITE 

 Peak

 Average

 Peak

 Average

 1 to 6GHz

 70dBuV/m

 54dBuV/m

 76dBuV/m

 60dBuV/m

Values are given for measurement distance of 3m. Allowable distances are >1m and <10m. Limit values are adjusted to take account of distance:

L(dist) = L(3m) + 20Log(3/d) where d is the distance.

EN55022:  Telecom ports.

Other changes in 55022:2006 relate to the measurement techniques for emissions from telecom ports, specifically the design and use of the ISNs. This is a complex issue, with 4 different test techniques suggested. Perhaps this should be considered ‘work-in-progress’. In the meantime, changes to EN55015  (CISPR15), see below, imply that the use of CDNs are a reasonable alternative. The x46 series of CDNs from Laplace are calibrated for emissions measurement up to 400MHz. 

It is expected that other countries that have adopted CISPR22 will implement the same changes at the same time, or soon after. These countries include As/NZ, Taiwan, Japan, Hong Kong, Korea, South Africa and Singapore.

New requirement for Luminaires……..

CISPR15 has an additional requirement for the testing of luminaires. Previously the requirement covered conducted emissions using a LISN and magnetic field emissions using a Large Loop Antenna, both over the range 9KHz – 30MHz. The new additional requirement involves measuring radiated emissions over the frequency range 30MHz – 230MHz. The standard recognises that the ‘conventional’ technique using an OATS and antenna is subject to significant measurement uncertainty and involves significant resource and cost. Therefore the measurement technique defined in this standard is to use a CDN(s) as normally used and defined in IEC61000-4-6 conducted immunity test. This technique is relatively simple and inexpensive, but has been shown to produce good correlation to OATS measurements.

Typically a type M2 or M3 CDN is used for the mains feed, and if the luminaire has supplementary feeds (eg control or communication connections), then a second CDN is also required, matched to the type of cable used.

 
Changes to the Large Loop Antenna requirements

This antenna was defined in EN55015. Construction and calibration details have now moved to CISPR16. Essentially the antenna remains the same, but the nomenclature has changed and the definition of the calibration data has been modified. See Technical Report for an analysis of these changes. Note that they do not change the actual use or measurements taken with the LLA.

RF absorbing clamp now withdrawn

The Laplace RF400 RF absorbing clamp has been withdrawn. However, as indicated above, the use of a CDN is now accepted as an alternative which offers both a lower cost and quicker solution (the CDN does not need to be moved along the cable as required by RF absorbing clamps). The Laplace CDNs are calibrated for emission measurements to 400MHz.