A.H. Systems SAS-563B Manual de operação - Página 8
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A.H. Systems Model EHA-51B Active Monopole and Loop Antenna
GENERAL USE INSTRUCTIONS
The EHA-51B loop antenna is an active loop designed to perform magnetic
field and shielding effectiveness testing. The loop antenna has a balanced
Faraday shield to reduce the E-field response for a pure magnetic field
measurement.
Each antenna is individually calibrated per IEEE 291-1991 and comes with a
calibration certificate references the NIST traceable test equipment. Initially
the antenna comes with a 1 year calibration interval, however depending on
the type of use and standards that the antenna is being used, this interval can
be adjusted.
The calibration tables shown provide a listing of the frequency of operation
and its antenna factor in dB/m. The field strength is the receiver voltage in
dBV plus the antenna factor (refer to the antenna factor calibration) plus any
cable loss. When making a measurement, mount the antenna on an
appropriate mast or tripod with the plane of the loop antenna facing the DUT.
SHIELDING EFFECTIVNESS TESTING
Both the EHA-51B with the loop antenna element attached and the SAS-564
loop antenna can be used for shielding effectiveness testing. The EHA-51B is
used as the receive antenna and should be connect to an analyzer or
receiver, where the SAS-564 Loop antenna is a passive loop antenna used to
transmit.
A.H. Systems inc. – Oct 2017
REV B
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