AMTEK Version 7.4 2019-01 Page 26 ©Inomatic 2017-2019
5. SYNCHRONIZATION
5.1. AM operating principle
The AMTEK AM systems operate on the pulse-listening principle. Using the zero
crossing of the 50Hz mains frequency as a trigger, a short TX pulse of 58kHz signal is
transmitted and a receiver window is ‘opened’ after the TX pulse has stopped.
If a tag was present within detection range during the TX pulse, the resonance of this
tag will be detected in the Signal (Receiver) window and an alarm will be triggered.
A noise reference window is opened to detect the environmental noise. This signal is
compared with the signal received in the Signal window and allows the software to
properly distinguish a tag signal from a noise signal.
The figure below shows the AM operating principle (at 50Hz, with a default delay of
10μs) during one 50Hz cycle
TX Pulse
TX Pulse 1.6ms or 1.5ms (setting via InfoNet)
LS1 Signal window 1400μs
LS2 Reference window 1400μs
DEL Detect delay 100μs
The LS2 can be shifted individually via infoNet V5 or higher
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