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Operating and
Service Manual
10000A225B
Model
10050583 (High Voltage)
10051430 (Low Voltage)
Part Number
Serial Number
160 Schoolhouse Road, Souderton, PA 18964 • 215-723-8181 • Fax 866-859-0582 • www.arworld.us

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Summary of Contents for AR 10000A225B

  • Page 1 Operating and Service Manual 10000A225B Model 10050583 (High Voltage) 10051430 (Low Voltage) Part Number Serial Number 160 Schoolhouse Road, Souderton, PA 18964 • 215-723-8181 • Fax 866-859-0582 • www.arworld.us...
  • Page 3 REGULATION (EC) 1907/2006 of the European Parliament and of the Council of 18 December 2006 concerning the Registration, Evaluation, Authorization and Restriction of Substances of Very High Concern Chemicals (SVHC) Supporting documentation is held by AR RF/Microwave Instrumentation’s Quality department in Pennsylvania, United States. Place of issue:...
  • Page 5 Instructions for European EMC Conformity WARNING It is the responsibility of the user of this equipment to provide electromagnetic shielding, filtering and isolation which is necessary for EMC compliance to Directive 2014/30/EU. The equipment must therefore be operated in a shielded area which provides a sufficient level of attenuation to meet the radiated emissions and immunity specifications.
  • Page 7 The caution symbol denotes a potential hazard. Attention must be given to the statement to prevent Your AR equipment may have more than one power supply cable. Use damage, destruction, or harm. only approved power cable(s). If you have not been provided with a Dangerous voltages are present.
  • Page 8 EQUIPMENT CONTAINING LASERS risk of serious injury due to unsafe AR Field Probes (FL/PL Series) and Field Analyzers (FA product handling should be a fundamental Series) are Class 1 laser products containing embedded consideration every user.
  • Page 9 Zur Vermeidung von Personen- oder Sachschäden gilt BEVOR SIE DAS GERÄT ANSCHLIESSEN es, die Hinweise zu beachten. Ihre AR-Ausrüstung hat möglicherweise mehr als ein Stromversorgungskabel. Gefährliche elektrische Spannungen sind vorhanden. Verwenden Sie nur zugelassene Stromkabel. Falls Sie kein Stromkabel oder Höchste Vorsicht ist geboten.
  • Page 10 Die meisten Geräte müssen während des Versands, der Montage und des Gebrauchs LASER-INFORMATION transportiert werden. Jeder Nutzer sollte sich AR - Feldsonden (FL/PL-Serie) und Feldanalysatoren (FA-Serie) über das Risiko von schweren Verletzungen sind Laserprodukte der Klasse 1 mit eingebetteten Klasse-4- durch unsachgemäße...
  • Page 11 électrode de mise à la Votre équipement AR peut disposer de plus d’un câble d’alimentation terre de protection. électrique. Utilisez uniquement un ou des câbles d’alimentation approuves.
  • Page 12 éliminer le risque injustifié de blessures causées par le levage est fournie par les méthodes de travail de NIOSH (publication Les sondes de champ AR (série FL/PL) et les analyseurs de n° 94-110) disponibles sur : champ (série FA) sont des produits laser de classe 1 contenant des lasers intégrés de classe 4.
  • Page 13 Er zijn gevaarlijke elektrische spanningen aanwezig. Wees uiterst voorzichtig. VOOR HET OPZETTEN VAN DE STROOM Uw AR-apparatuur kan meer dan een netvoedingskabel bezitten. Gebruik alleen goedgekeurde netvoedingskabel(s). Koopt een Wijst op een terminal aan die bedoeld is voor aansluiting netvoedingskabel die is goedgekeurd voor gebruik in uw land als u...
  • Page 14 APPARAAT DAT LASERS BEVAT distributie, de assemblage en het gebruik moeten worden behandeld, moet het risico AR-terreinsondes (FL/PL-serie) en terreinanalysatoren (FA- op ernstig letsel als gevolg van een serie) zijn laserproducten van klasse 1 met ingesloten onveilige behandeling van het product een klasse 4-lasers.
  • Page 15: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS ....................i GENERAL INFORMATION ................1 General Description ....................1 Specifications ......................1 Installation ......................1 1.3.1 Location ........................1 1.3.2 Primary Power ......................2 RF Connections ...................... 3 1.4.1 Control and Combiner Cabinet Interconnection ............. 3 1.4.2 Amplifier Input Connector ..................
  • Page 16 Model 10000A225B 2.6.17 ALC Lockout Feature ................... 21 Fault Definition ....................22 Remote Operation ....................24 2.8.1 IEEE-488 (GPIB) Communication ..............25 2.8.2 RS-232 Communication ..................25 2.8.3 Fiber-Optic Serial Communication ..............26 2.8.4 USB Communication ................... 27 2.8.5 Ethernet Communication ..................27 2.8.6...
  • Page 17 Locating and Replacing Modules ................. 52 Appendix A. Installing Software Upgrades ..............55 FIGURES 10000A225B AC Line Cord Installation ..............2 Cabinet Positioning and External Cable Hookup ........... 3 Model 10000A225B Front Panel ................8 Model 10000A225B Rear Panel ................9 Menu Map ......................
  • Page 18 Model 10000A225B...
  • Page 19: General Information

    Select an operating location that will permit air to circulate freely around the amplifier’s cabinet. The Model 10000A225B utilizes air cooling and should be located where the normal flow of air into or exiting from the unit will not be restricted, diverted, or re-circulated through the unit itself; in particular, the flow of warm air exiting the rear of the amplifier should not be impeded.
  • Page 20 VAC, 47/63Hz, three phase Wye (5-wire). A 40 amp or greater, common-trip circuit breaker should be used to supply power to the 10000A225B high voltage model. Included with the high voltage model is two 15 foot (4.7 meters), five-conductor harmonized line cords consisting of three phase wires (brown, black, grey), a neutral conductor (blue) and a protective GND conductor (green/yellow).
  • Page 21: Rf Connections

    Model 10000A225B RF CONNECTIONS 1.4.1 Control and Combiner Cabinet Interconnection Position the amplifier cabinets as shown. There should be a minimum of three inches between the control cabinet and combiner cabinet to allow for proper cooling. Combiner Cabinet Control Cabinet...
  • Page 22: Amplifier Input Connector

    Model 10000A225B 1.4.2 Amplifier Input Connector The Type N female RF Input connector for the amplifier can be located on the front or rear of the amplifier. A maximum input signal of 0dBm is recommended to achieve full rated power. The amplifier is protected to +13 dBm input without damage or failure (0.2-225 MHz).
  • Page 23 Amplifiers Model 10000A225B The Model 10000A225B is a solid-state, Standard RF sample ports allow for Class A design, self-contained, air- forward and reverse power monitoring. cooled, broadband power amplifier This is a high-power Class A amplifier. Features: designed for applications where...
  • Page 24 Model 10000A225B • 10 kW • .01-225 MHz Electrical Specifications Parameter Symbol Minimum Typical Maximum Unit Rated Power Output (0.01 - 100 MHz) PSAT 10000 12500 >13000 Rated Power Output (100 – 225 MHz) PSAT 7000 9500 >10000 Input for Rated Output Power Output @ 3dB Compression (0.01 –...
  • Page 25 Model 10000A225B • 10 kW • .01-225 MHz Absolute Maximum Rating Exceeding any of the limits listed here may result in permanent damage to the device. Parameter Minimum Typical Maximum Unit RF Drive (.01 – .02 MHz) RF Drive (.02 – 225 MHz) ∞...
  • Page 26: Primary Power

    Model 10000A225B • 10 kW • .01-225 MHz Connector interfaces Function Type N – female (50 Ω) RF input 1-5/8 EIA – male (50 Ω) RF output N female (50 Ω), (80 dB typical) RF sample IEEE-488 24-pin female RS-232...
  • Page 27: Cabinet Positioning And External Cable Hookup

    Model 10000A225B • 10 kW • .01-225 MHz TYPICAL OUTPUT POWER (LINEAR FORMAT) 16000 14000 12000 10000 8000 6000 4000 2000 Freq. (MHz) P1dB P3dB P@0dBm Input TYPICAL OUTPUT POWER (LOG FORMAT) 16000 14000 12000 10000 8000 6000 4000 2000 Freq.
  • Page 28: Rf Sample Ports

    Model 10000A225B • 10 kW • .01-225 MHz TYPICAL SMALL SIGNAL GAIN @ -20dBm INPUT Freq. (MHz) TYPICAL HARMONICS @ 7500 WATTS Freq. (MHz) AR RF/Microwave Instrumentation • 160 Schoolhouse Rd, Souderton, PA 18964 • 215-723-8181 • info@arworld.us • www.arworld.us •...
  • Page 29 Freq. (MHz) AR RF/Microwave Instrumentation • 160 Schoolhouse Rd, Souderton, PA 18964 To order AR Products, call: 215.723.8181. For an applications engineer, call: 800.933.8181. Direct to Service call: 215.723.0275 or email: service@arworld.us For Faxing Orders: 866.859.0582 (Orders Only Please) info@arworld.us Approved for public release by AR RF/Microwave Instrumentation ISO 9001:2015 Certified •...
  • Page 31: Operating Instructions

    The 10000A225B amplifier is protected from input overdrive by an automatic level control circuit. The 10000A225B RF power transistors are protected from over temperature by sensing the chassis temperature near the RF output transistors.
  • Page 32: Control And Indicator Functions

    Model 10000A225B CONTROL AND INDICATOR FUNCTIONS The Model 10000A225B’s front panel is shown in Figure 2-1; the unit’s rear panel features are detailed in Figure 2-2. 2 3 4 Figure 2-1. Digital Control Panel (DCP) Features Item Title Function RF INPUT...
  • Page 33: Model 10000A225B Rear Panel

    Model 10000A225B Figure 2-2. Rear Panel Features Item Title Function RF INPUT RF Input Connector (rear option) SAFETY INTERLOCK Safety Interlock, 15-pin DIN connector REMOTE CONTROL GPIB, USB RS-232, F/O and Ethernet remote control connectors RF SAMPLE PORTS Forward (left) and Reverse (right) (rear option)
  • Page 34: Interface Identification

    Model 10000A225B INTERFACE IDENTIFICATION 2.3.1 Local Controls 2.3.1.1 Keylock Switch The Keylock Switch is provided for protection from unauthorized use or unexpected remote control of the amplifier. The amplifier can only be turned on locally when the Keylock Switch is in the LOCAL position.
  • Page 35: Inputs And Outputs

    2.4.3 IEEE-488, USB, and RS-232 Interfaces The Model 10000A225B’s remote interfaces allow remote control, via a computer, of all amplifier functions (except for the Keylock Switch position) that can be controlled from the front panel. When the amplifier is in the Remote mode (as determined by the position of the Keylock Switch), a special Remote display is shown (see Figure 2-3).
  • Page 36: Amplifier Operation

    Model 10000A225B AMPLIFIER OPERATION 2.5.1 Local Operation 1. Connect the input signal to the unit’s RF INPUT connector. The input signal level should be 0dBm maximum. 2. Connect the load to the unit’s RF OUTPUT connector. 3. Set the REMOTE/LOCAL switch to LOCAL.
  • Page 37: Inhibit Screen

    Model 10000A225B 2.6.2 Inhibit Screen The Inhibit screen is used as an indication to the user that the amplifier is in an inhibited mode. In inhibit mode the POWER button cannot be used, and no touch screen menu options are available. In addition, the ADJUST knob is disabled.
  • Page 38: Select Screen

    Model 10000A225B The green and red bar graphs and associated values display the forward and reverse power indicator values in Watts. The scale of the bar graphs is based on a range of 0 to rated power (see specification sheet). The forward power is indicated in green while the reverse power is indicated in red.
  • Page 39: User Screen

    Model 10000A225B 2.6.6 User Screen The User screen presents the user with the revision levels of all the firmware that is running on all the main control system components. For the Switch Breakout Board (SBB) assemblies, only the piggy-back assembly firmware is listed.
  • Page 40: Power Indicator Frequency Screen

    Model 10000A225B 2.6.8 Power Indicator Frequency Screen The Power Indicator Frequency screen allows the user to enter the current test frequency and improve the accuracy of the forward and reverse power indicators using a factory-installed look-up table. The black text at the top of the screen represents the current setting. The grey text shown inside the black box represents the new desired frequency and will update while entering a new value using the keypad.
  • Page 41: I/O Screen

    Model 10000A225B 2.6.10 I/O Screen The I/O screen is used to present the user with menu options pertaining to the remote I/O ports found on the rear of the unit and the interaction with the touch screen. These options include the GPIB address, RS- 232/Fiber-Optic Serial Baud Rate, and key beep.
  • Page 42: Rs-232/Fiber-Optic Serial Baud Rate Screen

    Model 10000A225B 2.6.12 RS-232/Fiber-Optic Serial Baud Rate Screen The RS-232/Fiber-Optic Serial Baud Rate screen is used to select the baud rate used by both the RS-232 serial port and the Fiber-Optic serial port. To get here from the Main Menu, touch the User menu button followed by the I/O menu button and finally the Serial menu button.
  • Page 43: Remote Screen

    Model 10000A225B 2.6.14 Remote Screen When the Keylock switch is set to the REMOTE position the Remote screen appears. This screen has all the same information as the Main Menu screen except that the blue bar graph and associated value are only for the RF Gain value.
  • Page 44: Amplifier Fault Diagnostic Mode

    (see the Troubleshooting section of this manual for more information). NOTE: This mode SHOULD NOT be enabled unless directed to by a customer service representative of AR/RF Microwave Instrumentation. Severe damage to the faulting module can occur if the RF is not disabled.
  • Page 45: Alc Lockout Feature

    Model 10000A225B 2.6.17 ALC Lockout Feature The ALC lockout feature allows users to lock all ALC settings and remain in the ALC Internal Mode regardless of a power cycle. Under normal operating conditions these settings can be changed at any time and reset with a power cycle.
  • Page 46: Fault Definition

    Model 10000A225B FAULT DEFINITION This section is used to define all faults that can occur and their source. Use the Control Line column to define what active control line generates the fault or use the text Internal for an internally generated fault from the control system (i.e., Internal 485 bus error).
  • Page 47 Model 10000A225B Fault Details Drop to Control Inhibit? RF OFF? Line Fault Text Description  = Yes  = Yes (<15 Characters) J5-15 0x0200 Amp A1 Amplifier Fault, A1   J5-16 0x0201 Amp A2 Amplifier Fault, A2  ...
  • Page 48: Remote Operation

    Model 10000A225B Fault Details Drop to Control Inhibit? RF OFF? Line Fault Text Description  = Yes  = Yes (<15 Characters) J5-20 0x0405 1029 Thermal A17 Thermal Fault, A17   J5-21 0x0406 1030 Thermal A18 Thermal Fault, A18 ...
  • Page 49: Ieee-488 (Gpib) Communication

    Model 10000A225B The status of the amplifier should be checked remotely just prior to issuing a command as well as after a command has been issued to ensure the command has been properly executed. When checking the status after issuing a command, it is good practice to add a delay of 100ms or more to allow the control system time to process the command.
  • Page 50: Fiber-Optic Serial Communication

    50um (minimum) to 200um (recommended) Connector Type: This port can be used in conjunction with a serial to fiber-optic or USB to fiber-optic interface, such as an AR IF7001 USB to Fiber-Optic interface. NOTE: The IF7001 device uses SMA connectors, so a fiber-optic cable is needed with ST connectors on one end and SMA connectors on the other.
  • Page 51: Usb Communication

    Once installed, the DeviceInstaller™ utility will scan the network and find all connected Lantronix Ethernet devices. This list of found devices will include any connected AR Ethernet devices. By selecting one of the connected devices from the list, its IP address and subnet mask can be changed along, with several other settings.
  • Page 52: Remote Commands

    Model 10000A225B 2.8.6 Remote Commands A typical command is made up of a key word and a parameter. A space in a command or response will be indicated as <space> in subsequent definitions. A vertical bar "|" dictates a choice of one element from a list. For example: <A|B> indicates that either A or B can be selected, but not both.
  • Page 53: Rf Gain Adjust

    Model 10000A225B 2.8.6.3 RF Gain Adjust This command sets the RF Gain of the amplifier in percent. LEVEL:GAIN<gain value> Syntax: Specifies the RF gain in % from 0 (minimum) to 100 (maximum) <gain value>: No (see the Machine State query command)
  • Page 54: Vswr Limit Selection

    Model 10000A225B 2.8.6.6 VSWR Limit Selection This command sets the value of the output VSWR limit. If the limit is exceeded, a fault will be triggered, and the RF output will be disabled. VSWR:LIM <selection> Syntax: 0 = None (Default) <selection>:...
  • Page 55: Alc Detector Gain Adjust

    Model 10000A225B 2.8.6.8 ALC Detector Gain Adjust This command sets the ALC detector gain, in percent. Use this setting to change how aggressively the ALC feature reacts when the ALC Threshold value has been exceeded. LEVEL:DET<det gain> Syntax: Specifies the ALC Detector Gain in % from 0 (least aggressive) to 100 (most <det gain>:...
  • Page 56: Identity Query

    Model 10000A225B 2.8.6.11 Identity Query This command queries the amplifier for its identity response. *IDN? Query: AR-RF/MICROWAVE-INST,<model>,<firm rev><LF> Response Format: The model designation of the amplifier. <model>: <firm rev>: The firmware revision of the control software. To query the identity of the amplifier, send the following command: Example: *IDN?<LF>...
  • Page 57: Amplifier State Query

    Model 10000A225B 2.8.6.14 Amplifier State Query This command queries the state of the amplifier. STATE? Query: STATE=<space><char1><char2><char3><char4><LF> Response Format: ASCII character (0 to 9 or A to F) representing a hexadecimal character <char1> - <char4>: Example: To query the state of the amplifier, send the following command: STATE?<LF>...
  • Page 58: Forward Power Query

    Model 10000A225B 2.8.6.14.1 Hex Character to Binary Bits Conversion Table Below is a table that can be used as a reference when deciphering the response from the STATE query. The binary bits of each of the four ASCII characters from the response can be located here.
  • Page 59: Reverse Power Query

    Model 10000A225B 2.8.6.16 Reverse Power Query This command queries the internally detected reverse power (values are corrected and linearized). RPOW? Query: RPOW=<power><LF> Response Format: The detected reverse power (0-99999) in Watts (value is always five <power>: characters, padded with spaces).
  • Page 60: Reset Faults

    Model 10000A225B 2.8.6.20 Reset Faults This command clears a resettable fault. A fault can only be cleared if the underlying issue that created the fault has been resolved. RESET Syntax: None Parameters: To clear a reported fault, send the following command: Example RESET<LF>...
  • Page 61: Clear Fault Log

    Model 10000A225B 2.8.6.23 Clear Fault Log Use this command to clear the entire contents of the error log. This action is permanent and cannot be undone. FSTA:LOG:CLEAR Syntax: None Response Format: To clear the entire fault log, send the following command: Example: FSTA:LOG:CLEAR<LF>...
  • Page 62: Sbb (Piggyback) Firmware Query

    Model 10000A225B 2.8.6.26 SBB (Piggyback) Firmware Query This command queries the firmware of the piggyback SBB assembly. *SBB? Query: SBB_SW_REV<revision><LF> Response Format: Where: x is the firmware revision. The revision of the SBB assembly. <revision>: Example: To query the piggyback SBB firmware revision, send the following command: *SBB?<LF>...
  • Page 63: Default Values

    Model 10000A225B 2.8.6.29 Default Values These commands define the default values of the system settings listed below. The default value is what will be used upon AC mains power-on. Not all settings listed below are available on all models. DEFAULT:LEVEL:GAIN<value>...
  • Page 64 Model 10000A225B Rev C...
  • Page 65: Theory Of Operation

    3. THEORY OF OPERATION INTRODUCTION The Model 10000A225B RF amplifier consists of a .01-225 MHz RF amplifier assembly. The RF amplifier assembly consists of a preamp/driver module, a driver amplifier module, two-way splitter, and two four-way splitters that feeds (8) four-way splitters to drive (32) final amplifier modules. These 32 final amplifier modules are combined through (4) eight-way combiners, and a final four-way combiner to yield a combined power of 10000 watts or more.
  • Page 66: A4-A5 Four-Way Splitter

    Model 10000A225B 3.2.4 A4-A5 Four-Way Splitter The Four-Way Splitter is a broadband splitter. The input signal is split into four equal-amplitude, equal-phase signals. The amplitude of each signal is 6-6.5dB below the input signal when all outputs are terminated into 50Ω...
  • Page 67: A59 Detector

    The A59 Detector converts the RF signals from the bi-directional coupler to a DC voltage for use in the automatic leveling, sample ports, and display circuitry. POWER SUPPLIES The Model 10000A225B contains twenty two switching power supplies. The input voltage range to the power supplies is 200–240 VAC, 47/63Hz. The AC input power is approximately 35kWatts. Control Cabinet PS1 is a multiple output power supply.
  • Page 68: A53 Interface Board

    Model 10000A225B 3.4.2 A53 Interface Board The A53 Interface board connects the remote control ports to the A52 controller. 3.4.3 A58 ALC The A58 Level Control Assembly performs the following functions: Provides automatic level control of the amplifier’s output when placed in ALC mode.
  • Page 69: Maintenance

    Section 4.3. Shipping instructions are as follows. To return an item, contact AR Customer Service for an RMA number and shipping instructions. Returns from outside the United States are not permitted without prior authorization. If shipping from outside of the United States, closely follow all directions on the RMA form for return shipping and marking.
  • Page 70: Troubleshooting

    LDMOS and other ESD-sensitive devices. Troubleshooting the Model 10000A225B in a logical manner can speed the solution to a problem. The settings of potentiometers (pots), capacitors (caps), or other variables should not be disturbed until other problems have been eliminated.
  • Page 71: General - Reading Faults

    If the fault does not clear with the RF drive off, some other problem exists in the amplifier. The digital control panel of the 10000A225B indicates the output power from the 10000A225B and the power reflected back to it. If the reflected power is very high, with respect to the forward power, this could indicate that the output coax cable is defective or that the load being driven has a high VSWR.
  • Page 72: Interlock Fault

    RF energy when these doors are opened. NOTE: The Model 10000A225B is shipped with a mating connector, which has a jumper from Pins 1 to 8 and 10 to 14, installed in the rear panel interlock connector. The unit will not operate unless the interlock circuit is closed.
  • Page 73: Power Supply Faults (Schematic 10050853 For Low Voltage 200-240 Vac Unit; 10053151 For High Voltage 380-415 Vac Unit))

    Model 10000A225B 4.3.5 Power Supply Faults (Schematic 10050853 for Low Voltage 200-240 VAC unit; 10053151 for High Voltage 380-415 VAC unit)) 4.3.5.1 PS1, PS2, and PS13 Fault The PS1and PS13 power supplies do not have a fault line. Operation must be verified manually checking both AC input and DC output.
  • Page 74: Low Or No Power Output (Dc Tests)

    Low Voltage 200-240 VAC unit; 10053151 for High Voltage 380-415 VAC unit) All indicators on the Model 10000A225B are normal, the front panel display reads RF On, and the cooling fans are operating. 1. Check the position of the RF Gain control—is it set to maximum gain? 2.
  • Page 75: Low Or No Power Output (Rf Test)

    The Model 10000A225B’s typical gain response at 0 dBm input and -20 dBm input is shown in Figures 4-1 and 4-2. The actual gain may vary considerably from that shown in Figure 4-1 but should be ≥ 70 dBm (0.01- 100 MHz) and ≥...
  • Page 76: Locating And Replacing Modules

    Model 10000A225B LOCATING AND REPLACING MODULES Remove rack enclosure side panels to gain access to Final modules. See Figure 4-3. Figure 4-3. 10000A225B, Left Side, Modules A38-A45. Rev C...
  • Page 77: Connectors

    Model 10000A225B Disconnect the green connectors, the SMA input and output connectors and remove the four module screws holding the module in place. See Figures 4-4 through 4-7. Figure 4-4. Connectors Figure 4-5. SMA Module Input Rev C...
  • Page 78: Final Module Rf Output

    Model 10000A225B Figure 4-6. Final Module RF Output Figure 4-7. RF Module Install new replacement module using new thermal pad (P/N 10051176). Tighten the four mounting screws in an X pattern to ensure even pressure. Rev C...
  • Page 79: Appendix A. Installing Software Upgrades

    The 1000A225B has the capability to upgrade software. The first step that should be taken is to power-down the unit from the front panel. 1. Go to the AR Website and download the AR Firmware Upgrade Utility along with the model specific upgrade file for the device being upgraded.
  • Page 80 Model 10000A225B Rev C...
  • Page 81 These modules are not field-repairable and should never be opened outside of AR’s Microelectronics Lab. The modules in these product lines have a security label on two sides of the modules between the housing and lid/cover. If the security label is removed and or cut, the warranty of the module will be voided.

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