LAPLACE INSTRUMENTS RF300 Mk II-A, User Manual

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Laplace Instruments Ltd
Page 30
Technical Report Laplace Instruments Ltd January 2010
RF300 Large loop antenna, an analysis of changes to the standards
These changes are due to the amendments to CISPR15 and CISPR16
The latest versions are now …..
CISPR15:2006 + A2:2009 and
CISPR16-1-4:2007 + A1:2008
The key changes related to LLAs are:
1. Sections related to the construction and specification of LLAs are moved from
CISPR15 to CISPR16. Note that in the new CISPR15, the requirements for the
LLA are referred to Section 4.7.1 in the new CISPR16, which does not exist! It
seems that the reference should be to Section 4.6.1. The same error is repeated
in CISPR16 which again refers in Annex C to the non-existent section 4.7.
2. The definition of the calibration data has been re-defined.
Previous
CISPR15
New CISPR16 Notes Significant changes
Annex B Annex C Description, construction and
validation of LAS Both annexes combined into one.
Annex C
Clause B1 Clause C1 Introduction Loop antenna named LAS (Loop
Antenna System
Clause B2 Clause C2 Construction of LAS Additional requirements for cables and
connectors.
Clause C3 Construction of loop Information previously included with
diagrams now included in text. Note low
R for inner conductor is required.
Clause B3 ----- Positioning of the LAS Requirement for minimum distance to
nearby objects,…… not included in new
CISPR16
Clause B4 Clause C4 Validation New definition for validation factor. (see
below).
Figure B1 Figure C1 General view None
Figure B2 Figure C2 Position of slits None
Figure C3 Construction of slits None
Figure C5 Metal box for current probe None
Figure B3 Figure C4 Example slit construction None
Figure B4 Figure C8 Validation factor Converted from dBuA to dB(
Ω
). See
below.
Figure C7 Positions of calibration loop None
Figure C9 Construction of calibration loop None
Figure C1 Figure C11 Sensitivity vs diameter None
Figure C2 Figure C10 Conversion factors between loop
current and magnetic field
strength at a distance. Factors for magnetic field with electric
field added. Factors for distance 30m
removed.