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AR 125A250 Series Operating And Service Manual

Rf broadband amplifier
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Operating and
Service Manual
125A250
Model
10046246
Part Number
Serial Number
160 School House Road, Souderton, PA 18964 • 215-723-8181 • Fax 866-859-0582 • www.arworld.us

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  • Page 1 Operating and Service Manual 125A250 Model 10046246 Part Number Serial Number 160 School House 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 Power Supplies ....................... 1 Installation ......................2 1.4.1 Location ........................2 1.4.2 Power ........................2 OPERATING INSTRUCTIONS ................ 7 General ........................7 Amplifier Front and Rear Panels ................
  • Page 16 Model 125A250 FIGURES Model 125A250 Front Panel .................. 7 Model 125A250 Rear Panel ................... 8 Typical Response @ 0dBm Input ................. 26 TABLES IEEE-488 Address Selection .................. 9 RS-232 Port Settings .................... 10 RS-232 (DCE) Port Pinout Diagram DB-9 Female..........10 2-4.

  • Page 17: General Information

    Protection is provided by DC current limiting, over-temperature shut down and RF power limiting. • SPECIFICATIONS Refer to the AR RF/Microwave Instrumentation Data Sheet at the end of this section for detailed specifications. POWER SUPPLIES The Model 125A250 contains two switching power supply. The input voltage range to the power supply is 100–240 VAC, 50/60Hz, selected automatically.

  • Page 18: Installation

    Model 125A250 INSTALLATION Before proceeding, thoroughly inspect the amplifier for signs of physical damage that may have been incurred during shipment and completely read the following installation and operating instructions, paying special attention to all CAUTION notes. 1.4.1 Location Select an operating location that will permit air to circulate freely around the amplifier’s cabinet. The Model 125A250 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;...

  • Page 19: Specifications

    DC voltage to them if an over- The export classification for this equipment is temperature condition occurs due to cooling EAR99. AR RF/Microwave Instrumentation 160 School House Rd Souderton, PA 18964 215-723-8181 For an applications engi- neer call:800.933.8181...

  • Page 20: Power

    CAN/CSA C22.2 #61010-1 90 watts, -30 dBc typical at 70 watts CENELEC EN 61010-1 SPURIOUS: Minus 73 dBc typical RoHS DIRECTIVE 2011/65/EU EXPORT CLASSIFICATION: EAR99   Ordering Options Contact your AR RF/Microwave Instrumentation Sales Associate for specific model configuration pricing.
  • Page 21 Page 3 Graphs 125A250  125 Watts CW  10kHz–250MHz...
  • Page 22 Page 4 Graphs 125A250  125 Watts CW  10kHz–250MHz...
  • Page 23 Page 5 Envelope Drawing 125A250  125 Watts CW  10kHz–250MHz 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...

  • Page 25: Operating Instructions

    2. OPERATING INSTRUCTIONS GENERAL Operation of the Model 125A250 broadband amplifier is quite simple. The amplifier’s input signal, whether swept or fixed in frequency, is fed into the jack marked RF INPUT, and the amplifier’s output signal is taken from the jack labeled RF OUTPUT. The unit is turned on by activating the front panel POWER switch. In the event of a major malfunction, protection is provided by a circuit breaker located on the unit’s rear panel.

  • Page 26: Local Operation

    Model 125A250 Figure 2-2. Model 125A250 Rear Panel LOCAL OPERATION 2.3.1 Power-up Sequence 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.

  • Page 27: Remote Communications

    Model 125A250 REMOTE COMMUNICATIONS This section describes remote operation of this product using the installed communications ports connected to a remote device such as a personal computer. All ports are active at all times, however only one port may be used at a time.

  • Page 28: Rs-232 Communications

    Model 125A250 2.4.2 RS-232 Communications The RS-232 port is a serial communications bus. All commands and queries through this port must be terminated with a <LF>. When a valid query is received, it is processed and the result is immediately transmitted back over the RS-232 interface.

  • Page 29: Usb Communications

    The connector type for this port is ST. This port can be used with either an AR IF7000 RS-232 to Fiber-Optic Interface or an AR IF7001 USB to Fiber-Optic Interface. Note that these devices use SMA connectors so a fiber-optic cable is needed with ST connectors on one end and SMA connectors on the other.

  • Page 30: Remote Commands

    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 a number of other settings.
  • Page 31 Model 125A250 2.4.6.1 Power On/Off This command controls the power on/off state of the amplifier. Syntax: Parameters: State(x): 0 = power off 1 = power on Response Format: None (No query for this command) Example: To turn the power on, send the following command: P1<LF> To turn the power off, send the following command: P0<LF>...
  • Page 32 = model designation n = firmware revision Example: To get the identity of the amplifier, send the following command: *IDN?<LF> Response: AR-RF/MICROWAVE-INST,125A250,1.0<LF> 2.4.6.5 IO Board Firmware Revision Query to get the firmware revision of the IO Board. Syntax: *IOB?
  • Page 33 Model 125A250 2.4.6.6 State Query to find the state of the amplifier. Syntax: STATE? Parameters: None STATE=<space>xyza Response Format: Where: x, y, z, and a are each an ASCII character representing a hexadecimal character. They can be 0 to 9 or A to F. Each hexadecimal character represents a 4-bit binary number.
  • Page 34 Model 125A250 2.6.6.13 Faults (125A250) Query to find the faults that have occurred with the amplifier. Syntax: FSTA? Parameters: None Response Format: FSTA=<space>00xx Where: xx = 00 to 04 (Hexadecimal) Description No Fault Interlock A2 Thermal A2 Amp To find out what faults have occurred, send the following query. FSTA?<LF> Example: FSTA= 0001<LF>...

  • Page 35: Theory Of Operation

    3. THEORY OF OPERATION INTRODUCTION The Model 125A250 RF amplifier consists of a .01-250 MHz RF amplifier assembly. The RF amplifier assembly consists of a Pre-Amplifier (Pre-Amp), and one final amplifier module. The power supply section consists of an AC input filter, a circuit breaker, +5V, +15V, and -15V power supplies;...

  • Page 36: A2 100W 400Mhz Module Assembly (Schematic 10039874)

    Model 125A250 3.2.2 A2 100W 400MHz Module Assembly (Schematic 10039874) The 100W 400MHz Module Assembly consists of RF matching circuits, an RF transistor (Q1), a bias control circuit, and a fault detection circuit. The RF input is fed to a 4:1 balun transformer composed of T1 and T2. The output signal of the 4:1 transformer is connected to the gates of Q1.

  • Page 37: Control System

    Model 125A250 CONTROL SYSTEM 3.4.1 A4 Control/Fault Board (Schematic #10042218) The A4 Control/Fault board consists of one 16-bit microcontrollers and several other ICs that monitor and indicate the status of the amplifier. Power is supplied using only a single 5-volt power supply. The board offers the following: Feature Quantity...
  • Page 38 Model 125A250 Rev B...

  • Page 39: Maintenance

    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 40: Troubleshooting

    Model 125A250 TROUBLESHOOTING CAUTION: The transistors used in the Model 125A250 amplifier are GaN HEMT and LDMOS transistors. These devices are very reliable when installed in a suitable circuit, but they can be easily damaged by improper troubleshooting or handling techniques. The gate junctions of the GaN HEMTs have a high input impedance and are susceptible to static damage or damage due to the use of an ungrounded soldering iron.

  • Page 41: Power On Indication Doesn't Display On Front Panel Vacuum Fluorescent Display (Vfd) When Power Switch Is Depressed (Schematic Diagram No. 10046262)

    <0.1V when S1 is depressed. S1 is normally open; it is closed only when it is depressed. The amplifier should change state every time the POWER switch is depressed. 8. If all voltages are correct and the unit still does not operate, contact AR to arrange for repair or replacement of the A4 Control/Fault Board.

  • Page 42: The Unit Cannot Be Operated Remotely

    Model 125A250 4.3.2 The Unit Cannot Be Operated Remotely 1. Verify that the front panel LOCAL/REMOTE switch is set to the REMOTE position. 2. Verify that the unit operates locally by resetting the LOCAL/REMOTE switch to the LOCAL position; if the unit does not operate locally, see 4.3.1 of this manual.

  • Page 43: Ps2 Fault (Schematic Diagram No. 10046262)

    Model 125A250 4.3.5 PS2 Fault (Schematic Diagram No. 10046262) The PS2 power supply has DC OK output which is normally low (< 0.1V) to the A4 J13, pin 30. If any of the PS2 outputs fail, this output will go high (> 4.0V) and inhibit the A1 High Gain Amplifier. 4.3.6 Amplifier Faults (Schematic Diagram Nos.
  • Page 44 Model 125A250 4.3.8 Low or No Power Output (RF Test) (Schematic Diagram No. 10046262) NOTE: The DC Tests specified in Section 4.3.7 should be completed before conducting the RF tests specified in the following sections. 1. The Model 125A250’s typical gain response at 0 dBm input and -20 dBm input is shown in Figure 4-1. The actual gain may vary from that shown in Figure 4-1 but should be ≥...
  • Page 45 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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