LAPLACE INSTRUMENTS RF300 User Manual - page 20
LAPLACE INSTRUMENTS LTD
RF300
USER GUIDE
Page 20
Appendix B
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.
Note 1.
The details of the LLA were given in Annex B of CISPR15. These are now transferred to Annex C of
CISPR16. Most of the content has remained the same, but Table 1 summarises the changes.
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.