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User manual
Antenna model: AT3000
Rev 6.0 – September 2014
Clampco Sistemi is a registered trademark of
Calzavara SpA
– via Corecian, 60 – 33031 – Basiliano (Italy) http://www.clampco-sistemi.com/
Connect the axis selection connector of the composite cable to the connector on the antenna pigtail, then fix the N
male RF connector to the antenna port. Always make sure that both connectors are well tightened to avoid poor
contacts: after measuring has been completed, always check that the connectors are still tight.
3.7. AT3000 functional check and metrological validation
In general, since it is necessary to perform measurements of declared uncertainty which satisfy required
repeatability and reliability criteria, it is always desirable to set up user metrological validation procedures aimed
at identifying and promptly resolving any problems with the devices used.
Periodic calibration in itself provides an opportunity for metrological validation but the intervals for this (usually
annual) are not frequent enough to guarantee the accuracy of all measurements performed in the intervening
period.
The chosen procedure, however simple or complex, must be aimed at least at identifying any potential serious
faults in the equipment in order to prevent it being used and, if possible, should highlight any deviations from
significant parameters which increase the total uncertainty of measurement.
The above procedure, which must be repeated at intervals established by the user based on the relative
requirements and the level of use of the device, naturally requires the availability of an RF generator, a receiver
and one or more other antennas operating in compatible bands and, finally, the possibility of creating a measuring
environment with radio-electric and environmental characteristics that are repeatable over time. In general,
intervals of no less than one third of the calibration interval is recommended.
The occurrence of a traumatic event for the device (impact, crushing, exposure to high temperatures, to rain or to
corrosive agents) or the need to perform measurements of extreme importance or involving high costs if the
measurement has to be repeated will, of course, require extraordinary metrological validation.
3.8. Near field measurements
When an antenna of this type is calibrated, it is normally used a field of known amplitude of radiative type (far
field plane wave or TEM mode), where the ratio between the electric field E and the magnetic field H has a known
and defined value (377Ω, i.e., wave impedance of the free space). This condition does not normally occur in the
near field region of a transmitting station.
Summary of Contents for AT3000
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