ETS-Lindgren 4630 Refrad Reference Radiator (Archived) - Manual (Page 13)

MODEL 4630 REFRAD REFERENCE RADIATOR APPLICATIONS
© EMC TEST SYSTEMS, L.P. – MARCH 2002 9
REV F – PN 399214
APPLICATIONS
The following applications assume the use of CalStan software. It
allows automatic measurements, data processing and
documentation of test results. See CalStan’s manual for further
information. CalStan is available from:
Austrian Research Center
Division of Electronics Electromagnetic Compatibility
Radio Frequency – Engineering Section
A-2444 Seibersdorf, Austria. Tel: +432254-780-2800.
[email protected]
Other applications are possible using the REFRAD as a field-
strength transfer standard.
For outdoor operations, precautions have to be taken in order to
avoid radio interference.
SITE INTERCOMPARISON
Intercomparisions are demanded by EN 45001 for all accredited
test laboratories, but are useful for all other laboratories as well.
To carry out an intercomparision, the reference radiator REFRAD
is set up in the center of the turntable. By analogy to NSA
measurements, the REFRAD is operated with dipole and loop
antennas at two heights above ground in horizontal and vertical
polarization. The frequency range is 30-1000 MHz. This procedure
requires no more than half a day. Computer control assures
efficient, fault less operation and the data is automatically
processed. Differences with respect to data from other sites can be
plotted and analyzed.
NORMALIZED SITE ATTENUATION
Normalized site attenuation (NSA) measurements are carried out
according to ANSI 63.4 and CISPR/A(Secr.)109, July, 1991. The
frequency range is 30 - 1000 MHz. The “volume method” has to
be applied: The transmilt antenna with the reference radiator
Archived 3/18/10