N. V. Nederlandsche Apparatenfabriek NEDAP ADRRFMD Manual Do Utilizador

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Manual iSense Lumen series

2.  

a.  

b.  

Disable all transmitters.

If all parameters in the RF gate performance section turn green again, there is a coupling

problem (the transmitter couples with a label-like object in environment). Please continue at the

'coupling problem' section.

If all parameters in the RF gate performance section remain orange or red, there is an active

interferer (another device that transmit radio waves around the 8.2 MHz RF spectrum, like

another EAS system, an engine or a power supply). Please continue at the 'active interferer'

section.

Coupling problem

Coupling problems are caused by objects that act as a label to the RF system. For example metallic

doorframes, metal checkouts, cabling: everything that runs in a loop and is metallic.

To solve these problems, there are a few things you can try:

Tighten screws in the metallic construction. This might work for checkouts or customer guidance rails.

Try to interrupt the metallic loop. This can be done by using non-metallic parts inside those loops, or to

make a cut in them.

Create a shortcut in the metallic loop, to make it smaller. In this way it will resonate at a different

frequency.

If the above solutions don't solve the problem, you can decrease the sensitivity of the system. This can be

done by ticking the 'reduced sensitivity' button in the RF Advanced Config.

If a decreased sensitivity doesn't work, and there is only one type of label or tag in the store, you

also have the option to increase the 'receiver delay', in steps of 3 dB.

The problem could also be solved with additional hardware:

A 3-loop only 50 ohm PCB. This will work when the coupling loop is located in the middle

height of the gate.

A shielding. This will work in a lot of cases. However, the detection distance will be reduced

with about 20 cm (0.7 ft.). The field will also slightly creep around the shield. This is called

'back detection'.

The 3-loop only 50 ohm PCB is only available in Europe, with CE certified products. Using the 3-loop

only 50 ohm PCB in other regions invalidates the local certifications.