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S42 Hardware User Guide
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Page 51 of 62
Figure 19 : S42/AI Placement Recommendation
6.5
Housing Guidelines
The individual case must be checked to decide whether a specific housing is suitable for the
use of the internal antenna. A plastic housing must at least fulfill the following requirements:
Non-conductive material, non-RF-blocking plastics
No metallic coating
ABS is suggested
6.6
Antenna Issues
S42/AI comprises a ceramic antenna which as a component is soldered to the
circuit board. This solution is functional for a S42/AI integrated into a plastic
housing.
The performance of the antenna has to be checked within the final integration environment.
Adjacent PCBs, components, cables, housings etc. could otherwise influence the radiation
pattern or be influenced by the radio wave energy. It must be ensured that the antenna is not
co-located or operating in conjunction with any other antennas, transmitters, cables or
connectors.
6.7
Safety Guidelines
According to SAR regulation EN 62479:2010 the S42is not intended to be used in
close proximity to the human body. Please refer to above-mentioned regulation for more
specific information.
In respect to the safety regulation EN60950-1: 2006 + A11: 2009 + A1: 2010 + AC: 2011 all
conductive parts of the S42are to be classified as SELV circuitry. OEM’s
implementing the S42in their products should follow the isolation rules given in
regulation EN 60950-1: 2006.
The PCB material of the S42 is classified UL-94V0.
6.8
Cleaning
In general, cleaning the modules mounted on the host board is strongly discouraged. Residues
between module and host board cannot be easily removed with any cleaning method..
•
Cleaning with water or any organic solvent can lead to capillary effects where the
cleaning solvent is absorbed into the gap between the module and the host board. The
combination of soldering flux residues and encapsulated solvent could lead to short
circuits between conductive parts. The solvent could also damage any labels.
•
Ultrasonic cleaning could damage the module permanently. Especially for crystal
oscillators the risk of damaging is very high.