Illustration 7-5: Antenna Positioning
3. Measurements are taken with horizontal and vertical antenna polarizations. Both Transmit
(TX) and Receive (RX) antennas must be aligned with the same polarization, the measured
polarization must be part of the test report
4. For localized testing of shielded room items such as doors, windows, filters, penetration
areas, etc. the transmitting antenna (as well as receiving antenna) will be positioned in front
of the items under test
3.3.7.1 Shielding Effectiveness Measurement
Three main steps are required to complete the Shielding Effectiveness measurement at each
test position:
1.
Take reference level measurement (Section 3.3.7.2)
2. Take attenuated level measurement (Section 3.3.7.3)
3.
Calculate Shielding Effectiveness (Section 3.3.7.4)
3.3.7.2 Reference Level Measurement
1. The reference level is the value of signal measured by the receiver equipment with the
receiving antenna located at a prescribed distance from the transmit antenna and located
outside of the shielded enclosure.
2. Measurement setup for the reference level is in accordance with the illustration below:
SIGNA Voyager Pre-Installation
Direction 5680008–1EN, Revision 2
Chapter 7 Appendix 161
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