CISPR 22:2008/ISH1:2009

SC CIS/I/Publication CISPR 22 (2008), Sixth edition/I-SH 01
INFORMATION TECHNOLOGY EQUIPMENT –
RADIO DISTURBANCE CHARACTERISTICS –
LIMITS AND METHODS OF MEASUREMENT

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by CISPR subcommittee I: Electromagnetic
compatibility of information technology equipment, multimedia equipment and receivers, of
IEC technical committee CISPR: International special committee on radio interference.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
CISPR/I/299/ISH CISPR/I/312/RVD

Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
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Introduction:
th
At the CISPR SC I plenary, held on the 27 October 2007, a decision was taken to set the
maintenance date for CISPR 22, Edition 6 to 2012. As a result the work identified within
CISPR/I/279/MCR will not be started for the time being. At the subsequent meeting of CISPR
SC I WG3 it was decided that certain items within the MCR would benefit now from further
clarification and an interpretation sheet would be helpful to users of the standard, with the
intent of including this information in a future amendment to the standard.
This information does not change the standard; it serves only to clarify the points noted.
CISPR SC I WG3 hopes that these clarifications will be of use to users and especially
laboratories testing to CISPR 22, Edition 6.0. The document is based on the comments
received on CISPR/I/290/DC.
Interpretation:
1. Selection of Average detector
CISPR 22 defines limits for radiated emissions at frequencies between 1 GHz and 6 GHz with
respect to both average and peak detectors. CISPR 16-1-1 defines two types of Average
detector for use above 1 GHz. For the limits given in CISPR 22 the appropriate average
detector is the linear average detector defined in 6.4.1 of CISPR 16-1-1:2006 with its
Amendments 1:2006 and 2:2007.
October 2009 ICS 33.100.10
2. Measurement of conducted emissions on cabinets containing multiple items of
equipment
Where the EUT is a cabinet or rack that contains multiple items of equipment that are
powered from an AC power distribution strip and where the AC power distribution strip is an
integral part of the EUT as declared by the manufacturer, the AC power line conducted
emissions should be measured on the input cable of power distribution strip that leaves the
cabinet or rack, not the power cables from the individual items of equipment. This is
consistent with the requirements in 9.5.1 paragraph 1 and sub paragraph c).

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October 2009 ICS 33.100.10
SC CIS/I/Publication CISPR 22 (2008), Sixième édition/I-SH 01
APPAREILS DE TRAITEMENT DE L'INFORMATION –
CARACTÉRISTIQUES DES PERTURBATIONS RADIOÉLECTRIQUES –
LIMITES ET MÉTHODES DE MESURE
FEUILLE D'INTERPRÉTATI
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