Nedap N V XQMK2 Anti-Pilferage Device User Manual Manual XQ MK2 2010 1 indd

N. V. Nederlandsche Apparatenfabriek NEDAP Anti-Pilferage Device Manual XQ MK2 2010 1 indd

Installation manual

- 1 - manualXQ MK2 ElectronicsJanuari, 2010PRELIMINARYMetal Detection Settings Only
- 2 - Technical SupportE-Mail : support-rs@nedap.comSafety precautionsCAUTION - RISK OF ELECTRIC SHOCK - DO NOT OPENCAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED NEDAP SERVICE PERSONNEL.Lightning ash with an arrowhead, enclosed in a triangle, alerts you to the presence of uninsulated voltage points inside the product which could cause a serious electrical shock. An exclamation mark enclosed in a triangle alerts you to important operating and maintenance in-structions in the documentation provided with the product.WARNING! To avoid the risk of re or electrical shock, never expose these products to water or operate in a high humid-ity environment.EN 50419:2005EN 50419:2005 This European Standard species a marking • of electrical and electronic equipment in accordance with Article 11(2) of Directive 2002/96/EC (WEEE); This is in addition to the marking requirement in Article 10(3) of this Directive which requires producers to mark electrical and electronic equipment put on the market after 13 August 2005 with a ‘crossed-out wheeled bin’ symbol. • that applies to electrical and electronic equipment falling under Annex IA of Directive 2002/96/EC, provided the equipment concerned is not part of another type of equipment that does not fall within the scope of this Directive. Annex IB of Directive 2002/96/EC contains an indicative list of the products, which fall under the categories set out in Annex IA of this Directive; • that serves to clearly identify the producer of the equipment and that the equipment has been put on the market after 13 August 2005. © 2009 Nedap Retail Support Netherlands Parallelweg 2d, 7141 DC GroenloThe software / hardware described in this book / le is furnished under a license agreement and may be used only in ac-cordance with the terms of the agreement.Documentation version Manual XQ MK2 2010 1 PRELIMINARYCopyright NoticeAll Rights Reserved. Any technical documentation that is made available by Nedap Retail Support is the copyrighted work of Nedap Retail Support and is owned by Nedap Retail Support.No warranty The technical documentation is being delivered to you and Nedap Retail Support makes no warranty as to its accuracy or use. Any use of the technical documentation or the information contained therein is at the risk of the user. Documentation may include technical or other inaccuracies or typographical errors Nedap Retail Support the right to make changes without prior notice. No part of this publication may be copied without the express written permission of Nedap Retail Support, Parallelweg 2d, 7141 DC Groenlo, NetherlandsTrademarks Nedap, the Nedap logo, Nedap EASi/Net and the Nedap EASi/Net are registered trademarks of Nedap N.V. Groenlo.Other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.Digital Printed in the Netherlands
- 3 - Table of Contents2 Technical Support2 Safety precautions2 Copyright Notice4 1. Introduction4 1.1 XQ MK2 RX (R2)4 1.2 XQ MK2 Tx (T2)4 1.3 | 4 Watt transmitter5 1.3.1 Aisle Improvement Module5 1.4 New Attenuator5 1.5 Performance Indicator6 2. Block diagrams6 2.1 Network communication and sync6 2.1.1 Hand-terminal-connection (K100)7 2.1.2 Data communication over coax7 2.2 Transmitter7 2.2.1 Anti-deactivation regulation7 2.2.2 Output multiplexer7 2.2.3 Tx output power setting8 2.3 Receiver8 2.3.1 Input multiplexer8 2.3.4 Processor9 2.3.5 Customer counting9 2.3.6 Test-connectors 9 2.4 Dummy loads10 3. PCB Components overview10 3.1 Connector overview XQ TX12 3.2 Connector overview XQ RX14 4. Unit address14 5. Connection to PC / Laptop15 6. Networking with NCC MK215 Overview of necessary NCC’s15 2 antennas XQ MK2 congura tion16 3 antennas XQ MK2 congura tion16 4 antennas XQ MK2 congura tion17 5 antennas XQ MK2 congura tion17 6 antennas XQ MK2 congura tion17 7 antennas XQ MK2 congura tion18 8 antennas XQ MK2 congura tion18 9 antennas XQ MK2 congura tion19 10 antennas XQ MK2 congura tion19 11-16 antennas XQ MK2 congu ration20 30 antennas XQ MK2 congura tion21 7. Conguration Manager22 8. Metal Detection22 8.1 T2 settings22 8.1.1 Tx Enable22 8.1.2 Applicatien Version22 8.1.3 Bootloader version22 8.1.4 Sync Period22 8.1.5 Frequency22 8.1.6 Current22 8.1.7 Power23 8.1.8 Adjusting the transmitter settings24 8.2 R2 Settings24 8.2.1 RxEnable24 8.2.1 Applicatien Version24 8.2.2 Bootloader version24 8.2.3 Sync Period24 8.2.4 Sync Voltage24 8.2.5 Frequency24 8.2.6 Gain24 8.2.7 Coupling25 8.3 R2 Alarm25 8.3.1 Alarm25 8.3.2 Blocked25 8.3.3 Sensitivity25 8.3.4 Threshold25 8.3.5 Noise level25 8.3.6 Signal Level25 8.3.7 Adjusting receiver settings26 8.4 R2 Scope27 9. Specications X2
- 4 - 1. IntroductionThe XQ MK2 Units are the successors of the XQ series internal OS/T electronics. The complete redesign has many new features: • Powerful transmitter (4 watt)• Attenuator setting can be done for every aisle separately • Attenuation jumpers are replaced by a rmware setting• Integral customer counting• Integral Metal detection, fully (remote) congurable with OS/T congurator1.1 XQ MK2 RX (R2)1.2 XQ MK2 Tx (T2)The Tx units come with a 4 watt transmitter, which can be switched on with a special functionality module.1.3 | 4 Watt transmitterThe advantages of the new transmitter are:• Aisle width between panels can be proximally 10 % more for the same labelOR• Distance between the panels will be the same and smaller labels can be usedOR• To suppress interference from other systems
- 5 - In combination with an AIM module (Aisle Improvement Module) the full features of the transmitter can be used.1.3.1 The AIM (Aisle Improvement Module)The module increases the power up to 4Watt. All antennas suitable for the XQ Mk2 internal units with metal detection will be suitable for 4 Watt (effective power). The outside of the antenna will be marked with a ‘4W’ addition to the serial label. Inside the antenna the will be a label“Suitable for 4 W “1.4 New AttenuatorThe advantages for the attenuator are:• Easy installation• Additional external attenuators are not necessary anymore• Hardware jumper settings are replaced through software settings• Useful for aisles with different aisle width, example system with 2 aisles• First aisle width is 1.60 meters• Second aisle width is 1.00 meters1.5 Performance IndicatorFirmware version 1.8xx and up contains performance indicators. This means that it is possible to actually trace the delivered system performance. A Nedap EAS system contains several different signal processing functions, which are mapped to several different hardware units. For example we have a power supply, a sweep generator, a transmitter, a receiver, and deactivation units. To moni-tor the performance of the system from bird’s eye view we have to look at and integrate all performance indicators of each comprising unit. The actual data integration is done off line, in the TOPserver and or Easinet.For all OST units we need performance indicators:1. Performance indicator for a power supply. A measure which indicates in time the actual delivery of good power. In practice as long as the system is working the power is considered to be good. So this performance is not separately monitored. System uptime is used as indicator.2. Performance indicator for a sweep generator. A measure which indicates in time the actual delivery of good sweeps to the system. In practice as long as the system is working the sweep generator is considered to be good. This performance is not separately monitored. System uptime is used as indicator. 3. Performance indicator for transmitters. A measure which indicates in time the actual delivery of good sweeps to the transmitter panel. Interruptions of the power delivery due to AGC actions are monitored. This is a new performance indicator.4. Performance indicator for receivers. A measure which indicates in time the actual reception of clean sweeps from the panel. This is not explicitly monitored.And a measure which indicates in times the actual level of external noise. This level must contain all detection prohibit-
- 6 - ing signals. This signal is monitored. This is the second new performance indicator. With these performance indicators it should be possible to monitor accurately the performance of the system. These indicators cover the primary detection function. Also the communication is checked continuously of course. Altogether it is expected that the most frequent occurring disturbances and failures are covered. Some mechanical failures are not covered, like receiver antennae wire failures. To cover these type of events it is sufcient to look at the occurrence of label detection events at all. If alarm events occurs one can safely assume that the system is not dead yet. The most important feature is the logging of EAS detection performance over time. Covered events are downtime due to power outages, loss of transmit signal due to AGC events, occurrence of alarms, and environmental noise which degrades the detection performance’s. Of course it is not possible to distinguish between false alarms and true label alarms, because if that would be possible then all false alarms could be eliminated beforehand.5. Performance indicator for standalone label deactivation units. A measure which indicates in time: • the actual delivery of good power• the actual delivery of good sweeps to the system• the actual delivery of good sweeps to the antennaThese parameters are covered by the system uptime indicator. • the actual reception of clean sweeps from the panelThis parameter is monitored by the receiver (type) performance indicator.2. Block diagramsThe XQ MK2 Transmitter with integral customer counting and metal detection.2.1 Network communication and syncThe XQ units are slave-only, they need an RF signal originating from a master output . This could be an NCC, SQ unit or TDC unit. The RF signal has a frequency of four times 8.2 MHz and sweeps between 30.... 36 MHz.The RF signal is used to drive the transmitters as well as the receivers. The Coaxial cable between master-output and slave input is also used to distribute DC power and data-communication2.1.1 Hand-terminal-connection (K100)A standard NEDAP RS handheld terminal (HT) may be connected to connector K100. With this HT you can edit the various local settings. With this terminal all digital settings can be made, even if the network is nonfunctional.Some settings can only be adjusted by using an OS/T Conguration ManagerEspecially the Metal detection settings are only possible with the congurator
- 7 - 2.1.2 data communication over coaxOne of the important features from the OS/T system is the data-com over the coax-cable. With this feature it’s no longer necessary to use an extra data-cable between the units, which simplies the installation of the system. All the connected units are interrogated periodically by the master. If there are messages like an alarm on a connected Rx unit, then the mas-ter unit will process this and takes the necessary action: Sending a command to turn on the lamps on the activated aisle.The XQ MK2 unit has two slave-sync connectors (K101 and K102) from which the unit can be driven from a NCC-4, SQ, or TDC unit. DC supply is from the sync-connectors. 2.2 TransmitterThe Transmitter generates an 8.2 MHz RF signal with a maximum power level of 4 Watt to feed the transmitter antenna. The transmitter receives its RF reference signal and conguration data from the local communication control section.The start-pulse is distributed as a 1 microsecond break of the RF signal (32 periods) and indicates the start of the 1.6 ms sweep. All timing of the OS/T-system is related to this start-pulse.The RF signal (with a 30 till 36 MHz sweep) for the power amplier is divided by for 4 to create the 8.2 MHz transmitter sig-nal. The power amplier consists of a class D MOSFET driver stage. The square wave output is ltered to achieve a cleaner carrier. The 50 ohm output impedance is regulated by measuring output current and output voltage and adjusting the drive signal of the MOSFET power stage accordingly. These two output parameters are measured with a current transformer and a capacitive voltage divider circuit at the output stage. From these signals a phase control signal and the amplitude control signal are derived. Both signals can be seen on the test connector. The signals are the feedback to the driver stage.2.2.1 anti-deactivation regulationIf a RF label comes close to the antenna, it could be deactivated by the transmitter eld. To prevent this phenomenon a tag detection circuit is used. A tag close to the antenna can be detected by looking at the antenna signal. A resonating tag in proximity causes a small phase-disturbance in the antenna impedance, which can be seen on the phase control signal of the transmitter. When in a sweep a tag pulse is found the processor can reduce the transmit power in the next sweep to prevent deactivation of the tag. After the tag signal disappeared the transmit power is gradually increased to the desired power level.2.2.2 output multiplexerThe transmitter can feed one antenna. The RF signal is switched during the y-back period of the RF sweep. The multiplexer is a 1 out of 2 type build with PIN diodes. In the y-back-period the antenna is switched off.The second output of the multiplexer goes to an internal dummy load. This is used for multiplexing when more than one aisle is used. The “unused” phases can be dumped in the dummyload.The antenna-output has his own lamp-control-circuit and can be switched on or off individually. The lamps are controlled by software. The outputs have open, overload and short-circuit detection. These signals are under processor control.The lamp control circuit is also used for driving the new-style (two-wire) buzzer.2.2.3 tx output power setting
- 8 - Default power setting is 2 Watts. This is suitable for almost every situation. With large aisle withs (2 meters or more) it can be usefull to increase the power to 4 watts.2.3 ReceiverThe Receiver detects the tag signals generated by tags in the aisle formed by a transmitter panel and a receiver panel. Even very small signals can be detected to achieve a very high pick rate. Aided by heavy use of digital signal processing the false alarm rate is very low, even under difcult noise conditions. The receiver receives its RF reference signal and conguration data from the local communication control section.The antenna is connected to K202. Every sweep the antenna canl be connected to the receiver. This is done in the multiplex-er circuit. After the multiplexer an attenuation stage can be used to reduce the level of direct feed through in case of very close antenna distance. The attenuator can be selected as 0, -6dB, -12dB and -18dB. The setting is possible with the hand terminal (under the sensitivity menu) or with the OS/T Conguration Manager.A new feature is the possibility to set the attenuator per phase. The reference RF signal is split in four phases and fed to two mixers together with antenna input. Each mixer generates a LF signal which is ltered, amplied and muted in the y back period of the RF carrier. The mute circuitry consists of several stages which are controlled by software. The mixers are fed with 90 degrees phase shift. The resulting LF signals are further processed by the digital signal processor (DSP).The DSP uses digital memory to store the past quarter of a second to compare different sweeps and improve on noise level and other unwanted signals components. The ltered signal after processing can be seen on the scope by looking at the DAC signal.2.3.1 input multiplexerThe receiver can process two antenna signals. This means that at most 2 antennas can be connected. The antenna signal is switched during the y back period of the RF sweep. The multiplexer is a 1 out of 2 type build with PIN diodes. In the y back period all antennas are switched off. Antenna input 1 (K202) has his own lamp control circuit and can be switched on or off individually. The lamps are controlled by software. The outputs have an open, overload, and short circuit detection. These signals are under processor control.The secondairy antenna input (K201) is only meant for oor antennas and has no lamp/buzzer functionality.2.3.4 processorThe XQ MK2 series boards (Tx and Rx) have only one processor for RX, TX and Communication control.The processor has several different tasks. It must maintain the status of the transmitter and receiver and controls several functions:• lamp detection• lamp/lamp overload• multiplexer• data communication• handheld terminal communication• customer-counting 1x2 inputs
- 9 - • metal detectionAll the processor software and all the settings (including the network address) are contained in ash memory. Software is downloadable in runtime. A new version can be distributed over the network. After downloading, ashing and verifying a new version the unit resets and is operational again. This can be done remotely.2.3.5 customer countingThe XQ MK2 PCB has customer counting on board. Two sensors can be connected to monitor the entrance with direction sensitivity.The passage between sensors is shaped and buffered and processed by the processor. In this way incoming and outgoing label alarms can be counted for separately.The sensor power output is 12 V dc. It is possible to connect sensor with positive or negative going output signals.2.3.6 test-connectors K200: The receiver test-connector shows 3 analogue signals to aid in installing and servicing the receiver section. For easy external triggering a start pulse is available.The transmitter test connector shows the analogue signals needed to align and verify the transmitter.2.4 Dummy loadsDummy loads are no longer needed for the XQ MK2 PCB’s. Unused channels will be programmed as channel “0”.
- 10 - 3. PCB Components overview3.1 Connector overview XQ TXAntenna (TX out)Testconn.Handterm.Power on (Green)Metal Detection-error (Red)Metal Detection ON(Green)Lamp (Yellow)Customer counting(connector)50 Ω (1)Customer counting 2 (Yellow)Customer counting 1 (Yellow)Lamp Overload (Red)Datacom-error (Red)Alarm (Yellow)No function (2)GNDMD-outK201 K202K50ONOFFK200K100Metal Detection
- 11 - Sync inSync outK101K102
- 12 - 3.2 Connector overview XQ RXHandterm.Testconn.Aux 2Antenna 1MD-outGNDCustomer counting 1(Yellow)Customer counting 2(Yellow)50 Ω (1)Datacom-error (Red)Power on (Green)Lamp (Yellow)Lamp overload (Red)Alarm (Yellow)Metal Detection alarm(Red)Metal Detection Blocked(Yellow)Antenna 1 active (Green)Antenna 2 active (Green)Customer counting(connector)K106KeyswitchK103-+BuzzerK105No function (2)K200K100K201K202K400Metal DetectionONOFF Do not use!
- 13 - Sync inSync outK101K102
- 14 - 4. Unit addressEach XQ MK2 unit has an unique network address. The address is entered in the master unit to enable data communica-tion. The unit address is an 8 digit address; the last four digits will be a xed couple of characters, these characters will be used in the OS/T Conguration Manager and in the hand held terminal (for instance slave table etc.)5. Connection to PC / LaptopThe X2 uses a min-usb connector for a direct connection with the Conguration Manager.
- 15 - 6. Networking with NCC MK2NCC (networking electronics)• including power supply• synchronization of upto 16 antennas (max. 6 antennas per output)• The NCC MK2 can deliver power for a maximum 10 antennas with XQ MK2 electronics. Iin case of >10 antennas, a power inserter is needed for the next 10 antennas with XQ MK2 electronics.Overview of necessary NCC’s and power inserters Number of antennas Required1 t/m 10 1 NCC11 t/m 16 1 NCC + 1 power inserter17 t/m 26 2 NCC + 1 power inserter27 t/m 32 2 NCC + 2 power inserter33 t/m 42 3 NCC + 2 power inserter43 t/m 48 3 NCC + 3 power inserter49 t/m 58 4 NCC + 3 power inserter59 t/m 64 4 NCC + 4 power inserteretc. etc.In case of large congurations, we advice you to contact Nedap Retail2 antennas xQ mK2 configurationNCC MK2Power supplyXQ R2XQ T2
- 16 - 3 antennas xQ mK2 configuration4 antennas xQ mK2 configurationNCC MK2Power supplyXQ R2XQ T2XQ R2NCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2
- 17 - 5 antennas xQ mK2 configuration6 antennas xQ mK2 configuration7 antennas xQ mK2 configurationNCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2XQ R2NCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2XQ R2XQ T2NCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2
- 18 - 8 antennas xQ mK2 configuration9 antennas xQ mK2 configurationNCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2NCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2
- 19 - 10 antennas xQ mK2 configuration11-16 antennas xQ mK2 configurationNCC MK2Power supplyXQ MK2PowerInserterNCC MK2Power supply
- 20 - 30 antennas xQ mK2 configurationPowerInserterPowerInserterNCC MK2Power supplyNCC MK2Power supplyXQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2XQ R2XQ T2
- 21 - 7. Conguration ManagerAll real-time data displayed in the conguration manager, is a subset from the real data. The data communication is not showing all data, to limit the load on the data bus.
- 22 - 8. Metal Detection8.1 T2 settings8.1.1 Tx EnableEnables or disables the metaldetection transmitter. Default is disabled.8.1.2 applicatien versionFirmware version of the metaldetection. This rmware can be remotely updated.8.1.3 Bootloader versionFirmware version of the bootloader. This rmware can only be programmed in the factory.8.1.4 sync periodThe measured period time of the OST sync pulse (Sweep setting 0 1 2 3). 8.1.5 freQuencyThe required metal detection frequency. In the future the range will be limited from 120..130 kHz. Now the range is from 100..150kHz for testing the PLL and lters. In the eld only use the range of 120..130kHz.The Frequency is only an indication. The actually generated frequency is calculated from the measured period time of the sync pulse.8.1.6 currentAn indication of the mean current drawn by the Tx Transmitter stage. The amount of current drawn depends very much on the frequency that is set, the type of antenna in use and the tolerance in the ltering components used.Therefore this is only a very rough indication. The current in the Tx transmitter stage is also limited by hardware.8.1.7 powerThe output power of the transmitter output stage. Low and high power are available. Step between Low and High is 6dB. The High power setting does not give any advantage in the sense of increased metaldetection sensitivity. High Power is ony needed at extreme distances between the panels and in Panels where the Antenna PCB is in the center of the antenna like EQ45 and D50. These antenna’s give half the eld compared with antenna’s with their PCB at the end of the eight antenna . Current coming from the center will ow equally in both loops of the eight loop.In an antenna with antenna PCB at the end of the eight loop The High power setting could be used when there is extreme environmental noise. When this is the case it is better to use another frequency setting.
- 23 - 8.1.8 adjusting tHe transmitter settings• Check the Tx Enable box to enable the transmitter• Adjust the frequency (Default 125kHz will be ok normally)• Adjust the Power Setting (Default Low is preferred)• Save the metaldetection settings by pushing the Metaldetection Save button. In the future this button will be combined with the save & close button
- 24 - 8.2 R2 Settings8.2.1 RxEnableEnables or disables the metaldetection receiver. Default is disabled.8.2.1 applicatien versionFirmware version of the metaldetection. This rmware can be remotely updated.8.2.2 Bootloader versionFirmware version of the bootloader. This rmware can only be programmed in the factory.8.2.3 sync periodThe measured period time of the ost sync pulse (Sweep setting 0 1 2 3). 8.2.4 sync voltageThis is the measured voltage at the output of the phase-correction integrator. The Phase-correction will adjust the phase error caused by phaseshift through the air (little) and phaseshift caused by the receivers input lter (much and depending on the frequecy that is set). The Voltage that is displayed is only an indication and does not always have to be the same with the same frequency setting. In a correct working system it wil be stable.8.2.5 freQuencyThe required metal detection frequency. In the future the range will be limited from 120..130 kHz. Now the range is from 100..150kHz for testing the PLL and lters. In the eld only use the range of 120..130kHz.The Frequency is only an indication. The actually generated frequency is calculated from the measured period time of the sync pulse.8.2.6 gainThis is the gain of the preamplier stage. It wil inuence the direct coupling as well as the metaldetection signal equally.8.2.7 couplingThe measured direct coupling at the receiver Mixer (Vtop). The direct coupling has to be 200mV minimal. When the coupling is less than 200mV the Phase correction integrator does not function propery. The receiver will be blocked by the software and generate no alarms.
- 25 - 8.3 R2 Alarm8.3.1 alarmIndicates if there is a metal detection alarm.8.3.2 BlocKedIndicates if the reiceiver is blocked. This happens after a reboot and if the direct coupling runs below 200mV.8.3.3 sensitivityThe Sensitivity together with the Threshold give the Threshold for the Metaldetection alarm. The Sensitivity is related to the direct couping. Large Direct coupling gives us a large metal signal. For alarming the Metal signal has to be a Sensitivity (dB) amount of the direct coupling.By relating to the direct couling the distance of antenna’s and the power setting have no inuence on the calcutated alarm threshold. (This is not totally correct yet but will be in the near future). Good setting of the sensitivity is about 10..20dB.8.3.4 tHresHoldThis setting determines by what factor the measured Noise is multiplied and the alarm threshold is raised.Noise is caused by Rx and Tx Pll jitter and noise picked up from the environment. Noise is measured continuously and dynamically increases the Alarm threshold.A lot of noise results in a less sensitive system.By decreasing the Noise Threshold the system becomes more sensitive but the probability of false alarm is increased.Good setting for the Noise threshold is 3..9dB.8.3.5 noise levelIndication of the measured noise.8.3.6 signal levelIndication of the measured Metal signal8.3.7 adjusting receiver settingsCheck Rx Enable to enable the receiver.Adjust the frequency so that it is the same as the transmitters frequencyAdjust the Gain until the direct coupling indicator is in the green area.Green is ok but preferably about 1000mV.Wait until the receiver is recovered from changing the settings. When it is recovered On the 
- 26 - Alarm Tab you will see that the Noise level is Low (about -54dB).Adjust the sensitivity to the required sensitivity.Save the metaldetection settings by pushing the Metaldetection Save button.In the future this button will be combined with the save & close button. 8.4 R2 ScopeThis scope displays the Metal signal that is measured. It gives a good indication of what is happening in the system.
- 27 - 9. Specications X2Frequency : 8.2 MHzAntenna Connections : 1x 50 Ohm BNC Transceiver connectorSynchronization : 1x input 50 Ohm BNC 1x output 50 Ohm BNCWeight : 3 kgTemperature range : 0°C …+40°CPower Supply : 30~33V DC, 400mA
- 28 - parallelweg 2d 7141 dc groenlo the netherlands t +31 (0) 544 47 15 55 f +31 (0) 544 46 58 14e info-rs@nedap.com www.nedapretail.com

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