NEXUS AM Deactivator
General AM and EAS issues
v2.1
Page 9 of 26
3
General AM and EAS issues
This chapter covers the various issues related to Acoustic Magnetic systems,
deactivators and Electronic Article Surveillance systems in general, like:
Noise sources
Installation guidelines
3.1
Noise sources
Listed below are various noise sources that might affect the performance of any EAS
system and deactivator. It is strongly advised to either eliminate these noise sources (as
far as possible) or maintain the largest possible distance to these noise sources.
The following devices can create noise signals or absorb AM signals which can reduce
the performance of an EAS system and AM deactivator:
AM systems installed in the same or other shops.
Any electronic device that operates around 58kHz or produces harmonic
frequencies around 58kHz.
An active laptop. The converter for the backlight in the screen can create a lot of
noise which is detected by the EAS system or deactivator and can reduce the
performance dramatically. Make sure to keep laptop computers at least 3 meters
away from the antennas.
(Moving) Objects containing metal, like checkouts, sliding and revolving doors,
elevators, escalators, roller shutters, frames, etc.
Electronic devices, like computers, laptop screens, LCD screens, cash registers,
engines, transformers, etc.
Vertically positioned power cables, both low voltage and high voltage.
Lights (flashing, fluorescent, halogen, gas-discharge, etc.)
Metal scan systems installed in close vicinity. Cr
oss Point’s Metal Scan operates
around 19kHz in channel 0 and has a third harmonic frequency around 58kHz.
3.2
Installation guidelines
Listed below are EAS installation guidelines to ensure a proper installed and functioning
system. Not following these guidelines might result in less performance of the NEXUS
AM Deactivator.
1. Check the shop carefully for possible noise sources prior to installation. If
possible noise sources are found then try to eliminate these sources or pick the
best position for the deactivator where the influence of these noise sources will
be minimized.
2. Avoid unnecessary long cables. If the deactivator is connected to the NEXUS
AM system, run the UTP cables in a direct line to the EAS antennas.
3. The NEXUS AM Deactivator is powered by 230VAC or 115VAC mains power.
The mains power frequency is 50-60Hz.
4. Mount the deactivator in recessed position into a (cash)desk. Dimensions for the
cut-out area are 240 x 200mm.
5. Make sure to properly insert the cables in the connectors.
