Checkpoint Systems Inc. STRATAPX Manual De Usuario
TUNING PROCEDURE TR4022
____________________________________________________________________________________________________________________________
CHECKPOINT SYSTEMS, INC. CONFIDENTIAL AND PROPRIETARY INFORMATION, FOR INTERNAL USE ONLY.
Rev. 00
Page
3
1.0
INTRODUCTION
This document describes the procedures required to properly tune a Strata System with the
TR4022 board. Many of the adjustments for the Strata are pre-tuned during the manufacturing
test process therefore adjustments required in the field have been minimized.
TR4022 board. Many of the adjustments for the Strata are pre-tuned during the manufacturing
test process therefore adjustments required in the field have been minimized.
Adjustments such as center frequency and sweep are preset for 8.2 Mhz operation. If the system
is required to detect a different frequency tag the sweep range will need to be readjusted by the
installer.
is required to detect a different frequency tag the sweep range will need to be readjusted by the
installer.
Once properly configured, if poor performance results, the CSE should direct their efforts toward
finding the source of the interference in the environment. Several test signals are provided by the
TR4022 board, which may be viewed on an oscilloscope. These signals allow the CSE to identify
and measure ambient noise levels, resonances and other sources of environmental interference.
finding the source of the interference in the environment. Several test signals are provided by the
TR4022 board, which may be viewed on an oscilloscope. These signals allow the CSE to identify
and measure ambient noise levels, resonances and other sources of environmental interference.
The DSP (digital signal processor) system automatically subtracts stationary resonances seen by
the antennas. The system offers flexibility to adjust for these circumstances. However, the
solution for environmental problems, is to determine the environmental problems and resolve
them. The options for adjusting to environmental problems are performed both in the analog and
digital realm by the technician. The analog solutions are reducing power on the transmit antennas
(2-loop and/or 3-loop), reduce the baseband gain, and adjust the sweep. In the digital toolbox
there are four user selectable filter parameters. These tools should be used only after the CSE has
attempted to correct the environment.
the antennas. The system offers flexibility to adjust for these circumstances. However, the
solution for environmental problems, is to determine the environmental problems and resolve
them. The options for adjusting to environmental problems are performed both in the analog and
digital realm by the technician. The analog solutions are reducing power on the transmit antennas
(2-loop and/or 3-loop), reduce the baseband gain, and adjust the sweep. In the digital toolbox
there are four user selectable filter parameters. These tools should be used only after the CSE has
attempted to correct the environment.
The Strata system is powered by a +24Vdc power supply, P/N 121878. This power supply can
power up to a maximum of three antennas.
power up to a maximum of three antennas.
2.0
SYSTEM DESCRIPTION
The Strata system is a transceiver design using both a 3-loop, 2-loop, and a 1-loop antenna design.
The Strata alternates between using the 2-loop antenna and the 3-loop antenna. The 1-loop
antenna is used as a shield that is tied to ground. This technique provides the system with
different views of the detection field allowing the system to improve detection by minimizing the
holes typically found at the crossbars of typical swept antennas.
The Strata alternates between using the 2-loop antenna and the 3-loop antenna. The 1-loop
antenna is used as a shield that is tied to ground. This technique provides the system with
different views of the detection field allowing the system to improve detection by minimizing the
holes typically found at the crossbars of typical swept antennas.
During an antenna’s cycle, the system performs two “blasts” which are called a “bin”. There are
sixteen bins per frame. A bin consists of two “noise” cycles and two blast cycles, a blast is a
transmit cycle and then a receive cycle. During the noise cycle, the system is not transmitting,
only receiving ambient noise. This allows the system to establish the baseline noise level of the
environment for later comparison. The system then transmits or “pulses” the field and then
receives or “listens” for an echo of a tag signal. This frame is repeated on the other antenna. A
tag response need only be present on one of the antennas to cause an alarm. In effect the system
provides the best of both worlds, a 2-loop and 3-loop design.
sixteen bins per frame. A bin consists of two “noise” cycles and two blast cycles, a blast is a
transmit cycle and then a receive cycle. During the noise cycle, the system is not transmitting,
only receiving ambient noise. This allows the system to establish the baseline noise level of the
environment for later comparison. The system then transmits or “pulses” the field and then
receives or “listens” for an echo of a tag signal. This frame is repeated on the other antenna. A
tag response need only be present on one of the antennas to cause an alarm. In effect the system
provides the best of both worlds, a 2-loop and 3-loop design.