AR 5000A225A Service manual

Operating and
Service Manual
5000A225A
Model
10044005
Part Number
Serial Number
160 School House Road, Souderton, PA 18964 • 215-723-8181 • Fax [phone] • www.arworld.us

Declaration of Conformity
Issue Date:
Model #/s:
Type of Equipment:
Function:
December 2018
Model 5000A225A Series
RF Broadband Amplifier
Designed to be used in a RF immunity test system or for research. The unit is intended
to amplify an RF signal and inject it into a load.
The equipment described above is declared to be in conformity with the following applicable national and international
standards. The conformity is valid only when equipment is used in a manner consistent with the manufacturer’s
recommendations and the reference documents.
EMC:
DIRECTIVE 2014/30/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 26 February 2014 on the
harmonisation of the laws of the Member States relating to electromagnetic compatibility
EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use–EMC requirements–Part 1:
General Requirements
SAFETY:
DIRECTIVE 2014/35/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 26 February 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of electrical
equipment designed for use within certain voltage limits
CENELEC EN 61010-1 Issued 2010/10/01 Ed: 3
Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use – Part 1: General
Requirements
UL 61010-1 Issued 2012/05/11 Ed: 3
Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use – Part 1: General
Requirements
CAN/CSA C22.2 #61010-1 Issued 2012/05/11 Ed: 3
Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use – Part 1: General
Requirements
HAZARDOUS SUBSTANCES (RoHS 3):
DIRECTIVE (EU) 2017/2105 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 November 2017 on
the restriction of the use of certain hazardous substances in electrical and electronic equipment (recast)
RECYCLING (WEEE):
DIRECTIVE 2012/19/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 4 July 2012 on waste
electrical and electronic equipment (WEEE) (recast)
SUBSTANCES OF VERY HIGH CONCERN (REACH):
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: AR RF/Microwave Instrumentation
160 School House Road
Souderton, Pennsylvania 18964 USA
Authorized officer of the company:
Patricia Thrasher
Manager Quality, Customer Service, Purchasing

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. The
following minimum levels are suggested for use in accordance with the rated power of the equipment.
Rated Power
Minimum shielding attenuation
100 watts
50 dB
101 - 1000 watts
60 dB
1001 - 10,000 watts
70 dB
Since this equipment is designed to generate high levels of Radio Frequency energy, it is also essential that the user
read and follow the “Instructions for Safe Operation” in this manual. If other equipment is operated in the shielded
room it may be disturbed by the amplifier.
ACHTUNG
Der Benutzer dieses Gerätes ist dafür verantwortlich, daß die elektromagnetische Abschirmung und Filterung
gewährleistet ist, welche gemäß Richtlinie 2014/30/EU notwendig ist. Das Gerät muß deshalb in einem geschirmten
Raum betrieben werden, welcher eine ausreichenden Schirmung bietet, um die Emissions- und
Störfestigkeitsspezifkation einzuhalten. Es werden folgenden Minimalwerte der Schirmdämpfung und Filterung in den
unterschiedlichen Leistungsklassen empfohlen.
Hochfrequenzleistung
min. Schirmdämpfung
100 Watt
50 dB
101-1000 Watt
60 dB
1001-10.000 Watt
70 dB
Falls andere elektrische oder elektronische Geräte gleichzeitig mit dem Gerät betrieben werden, kann es zu
Beeinflussungen kommen. Da das Gerät zur Erzeugung von Hochfrequenzenergie dient ist es daher auch unbedingt
notwendig, daß der Benutzer die Sicherheitsvorschriften in der Bedienungsanleitung liest und einhält.
AVERTISSEMENT
Il est de la responsabilité de l'utilisateur de cet équipement d'assurer la protection électromagnétique, le filtrage et
l'isolation nécessaires, afin de se conformer à la directive 2014/30/EU concernant la C.E.M. Par conséquent, cet
équipement doit être mis en fonctionnement dans une enceinte d'atténuation suffisante pour satisfaire aux
spécifications d'émissivité et de susceptibilité. Pour une utilisation conforme, les niveaux d'atténuation minimums
suivants sont suggérés en fonction de la puissance de sortie de l'équipement:
Puissance de sortie
Atténuation minimum de l'enceinte
100 Watts
50 dB
101 à 1.000 Watts
60 dB
1.001 à 10.000 Watts
70 dB
Puisque cet équipement est destiné à générer de forts niveaux R.F., il est essentiel que l'utilisateur se conforme aux
instructions de sécurité indiquées dans ce manuel. Tout autre équipement en fonctionnement dans la cage de Faraday
peut-être perturbé par 1'amplificateur.

INSTRUCTIONS FOR SAFE OPERATION
Revised 0517
Observe the following safety guidelines to help ensure your
own personal safety and to help protect your equipment and
working environment from potential damage.
INTENDED USE
This equipment is intended for general laboratory use in
generating, controlling, and measuring levels of
electromagnetic Radio Frequency (RF) energy. Ensure that the
device is operated in a location which will control the radiated
energy and will not cause injury or violate regulatory levels of
electromagnetic interference.
SAFETY SYMBOLS
These symbols may appear in your user manual or on
equipment.
This symbol is marked on the equipment when it
is necessary for the user to refer to the manual for
important safety information.
The caution symbol denotes a potential hazard.
Attention must be given to the statement to
prevent damage, destruction, or harm.
Dangerous voltages are present. Use extreme
care.
Indicates a terminal intended for connection to an
external conductor for protection against
electrical shock in case of a fault, or the terminal
of a protective earth (ground) electrode.
Indicates invisible laser radiation–do not view
directly with optical instruments.
Indicates frame or chassis ground connection
terminal.
Indicates alternating current.
Indicates this product must not be disposed of
with your other household waste.
Indicates that the marked surface and adjacent
surfaces can attain temperatures that may be hot
to the touch.
EQUIPMENT SETUP PRECAUTIONS
Review the user manual and become familiar with
all safety markings and instructions. Protection
provided by the equipment may be impaired if used
in a manner not specified by AR RF/Microwave
Instrumentation (AR).
•Follow all lifting instructions specified in this document.
•Place the equipment on a hard, level surface.
•Do not use the equipment in a wet environment, for
example, near a sink, or in a wet basement.
•Position your equipment so that the power switch is easily
accessible.
•Leave 10.2 cm (4 in) minimum of clearance on all vented
sides of the equipment to permit the airflow required for
proper ventilation. Do not restrict airflow into the
equipment by blocking any vents or air intakes. Restricting
airflow can result in damage to the equipment, intermittent
shut-downs or safety hazards.
•Keep equipment away from extremely hot or cold
temperatures to ensure that it is used within the specified
operating range.
•While installing accessories such as antennas, directional
couplers and field probes, take care to avoid any exposure
to hazardous RF levels.
•Ensure that nothing rests on your equipment’s cables and
that the cables are not located where they can be stepped
on or tripped over.
•Move equipment with care; ensure that all casters and/or
cables are firmly connected to the system. Avoid sudden
stops and uneven surfaces.
BEFORE APPLYING POWER
Your AR equipment may have more than one power supply
cable. Use only approved power cable(s). If you have not been
provided with a power cable for the equipment or for any AC-
powered option intended for the equipment, purchase a power
cable that is approved for use in your country. The power cable
must be rated for the equipment and for the voltage and current
marked on the equipment’s electrical ratings label.
Incorrectly installing or using an incompatible line
voltage may increase the risk of fire or other
hazards. To help prevent electric shock, plug the
equipment and peripheral power cables into properly grounded
electrical outlets. These cables are equipped with three-prong
plugsto help ensure proper grounding. Do not use adapter plugs
or remove the grounding prong from a cable.
Do not modify power cables or plugs. Consult a licensed
electrician or AR trained service technician for equipment
modifications. Always follow your local/national wiring rules.
Do not operate the equipment if there is physical
damage, missing hardware, or missing panels.
SAFETY GROUND
This equipment is provided with a protective earth
terminal. The mains power source to the equipment
must supply an uninterrupted safety ground of
sufficient size to attach wiring terminals, power
cord, or supplied power cord set. DO NOT USE this equipment
if this protection is impaired.

INSTRUCTIONS FOR SAFE OPERATION
Revised 0517
HAZARDOUS RF VOLTAGES
The RF voltages on the center pin of an RF output
connector can be hazardous. The RF output
connector should be connected to a load before AC
power is applied to the equipment. Do not come into
contact with the center pin of the RF output connector or
accessories connected to it. Place the equipment in a non-
operating condition before disconnecting or connecting the load
to the RF output connector.
ACOUSTIC LIMITATIONS
If equipment noise exceeds 80dB, ear protection is required.
MAINTENANCE CAUTION
Adjustment, maintenance, or repair of the equipment must be
performed only by qualified personnel. Hazardous energy may
be present while protective covers are removed from the
equipment even if disconnected from the power source. Contact
may result in personal injury. Replacement fuses are required
to be of specific type and current rating.
ENVIRONMENTAL CONDITIONS
Unless otherwise stated on the product specification sheet, this
equipment is designed to be safe under the following
environmental conditions:
•Indoor use
•Altitude up to 2000m
•Temperature of 5°C to 40°C
•Maximum relative humidity 80% for temperatures up to
31°C. Decreasing linearly to 50% at 40°C.
•Main supply voltage fluctuations not to exceed ± 10% of
the nominal voltage or minimum and maximum
autoranging values.
•Pollution degree 2: Normally non-conductive with
occasional condensation. While the equipment will not
cause hazardous condition over this environmental range,
its performance may vary.
EQUIPMENT CONTAINING LASERS
AR Field Probes (FL/PL Series) and Field Analyzers
(FA Series) are Class 1 laser products containing
embedded Class 4 lasers. Under normal use, the
laser radiation is completely contained within the
fiber optic cables and poses no threat of exposure. Safety
interlocks ensure that the laser is not activated unless the cables
are properly connected. Always exercise caution when using
or maintaining laser products. Do not view directly with optical
instruments.
RF ANTENNAS
•This equipment (antenna or antenna assembly) may be
heavy, requiring two persons to lift. Use caution when
installing or removing unit. Follow all equipment setup and
lifting instructions specified in this document.
•Ensure connectors are appropriate for intended operation.
Connectors are specified in the user manual and product
specification sheet.
•Do not exceed the maximum RF input level stated in the
specifications. Refer to the user manual and product
specification sheet to determine the applicable RF levels.
•Excessive RF input could damage the equipment or
connectors, causing safety hazards.
•When in operation, the RF voltages on the antenna
elements can be hazardous. Do not come into contact with
the antenna or elements when the RF input connector is
connected to a live RF source.
•To avoid injury to personnel and accidental damage to
power amplifier or antenna, disable the RF output of power
amplifier before connecting or disconnecting the input
connection to the antenna.
•Perform periodic inspections of antenna and field probe
systems to verify calibration due date, proper operation,
and overall condition of equipment.
RACK MOUNTED TWT MODELS
Some TWT models are supplied without the removable
enclosure offered for benchtop use. These rack-mountable
models may be supplied with either carry handles or slides and
front handles installed. Follow all lifting instructions specified
in this document and installation instructions supplied in the
TWT user manual.
LIFTING INSTRUCTIONS FOR AR EQUIPMENT
Because most products must be
handled during distribution, assembly
and use, the risk of serious injury due
to unsafe product handling should be
a fundamental consideration of every
user. An authoritative guideline for
eliminating unwarranted risk of injury caused by lifting is
provided by the NIOSH Work Practices (Publication #94-110)
available at:
https://www.cdc.gov/niosh/docs/94-110/pdfs/94-110.pdf.
In general, observe the following guidelines for lifting a weight
of 50 lb or more:
•Use lifting eye (for floor standing) or side handles (table
top) to lift unit only.
•Use equipment of adequate capacity to lift and support unit.
•If using forklift to move unit, be sure forks are long enough
to extend beyond the side of the unit.
•For additional information, follow the link specified above.

i
TABLE OF CONTENTS
TABLE OF CONTENTS ..................................................................................................i
1. GENERAL INFORMATION............................................................................. 1
1.1 General Description............................................................................................... 1
1.2 Specifications......................................................................................................... 1
1.3 Power Supplies ...................................................................................................... 2
1.4 Protection Circuits ................................................................................................. 2
1.5 Installation ............................................................................................................. 3
1.5.1 Location................................................................................................................. 3
1.5.2 AC Power............................................................................................................... 3
1.5.3 Driver Output Cables............................................................................................. 4
1.5.4 RF MPA Output Cables......................................................................................... 4
1.6 Other Connections ................................................................................................. 5
1.6.1 Amplifier Input Connector..................................................................................... 5
1.6.2 Amplifier Output Connector.................................................................................. 5
1.6.3 Safety Interlock Connector.................................................................................... 5
2. OPERATING INSTRUCTIONS........................................................................ 9
2.1 General................................................................................................................... 9
2.2 Control and Indicator Functions............................................................................ 9
2.3 Interface Identification and Diagrams ................................................................. 10
2.3.1 RF Input............................................................................................................... 11
2.4 Operator Command and Control Interface .......................................................... 11
2.4.1 Local Control Interface........................................................................................ 12
2.4.1.1. Keylock Switch ............................................................................................. 12
2.4.1.2 Power Button................................................................................................. 12
2.4.1.3 Adjust Knob .................................................................................................. 12
2.4.1.4 Touch Screen................................................................................................. 12
2.4.1.5 Menu Map..................................................................................................... 12
2.4.1.5.1 Inhibit Screen ................................................................................................ 13
2.4.1.5.2 Main Menu Screen ........................................................................................ 14
2.4.1.5.3 Select Screen ................................................................................................. 15
2.4.1.5.4 Mode Screen.................................................................................................. 15
2.4.1.5.5 User Screen ................................................................................................... 16
2.4.1.5.6 More Screen .................................................................................................. 16
2.4.1.5.7 I/O Screen...................................................................................................... 17
2.4.1.5.8 GPIB Address Screen.................................................................................... 17
2.4.1.5.9 RS-232/Fiber-Optic Serial Baud Rate Screen............................................... 18
2.4.1.5.10 Key Beep Screen........................................................................................... 18
2.4.1.5.11 Remote Screen............................................................................................... 19
2.4.1.5.12 Fault Screen................................................................................................... 19
2.4.2 Remote Control Interface..................................................................................... 20
2.4.2.1 GPIB (IEEE-488) Communication ............................................................... 20
2.4.2.1.1 Setting the GPIB (IEEE-488) Address.......................................................... 20
2.4.2.2 RS-232 Communication................................................................................ 20
2.4.2.3 Fiber-Optic Serial Communication............................................................... 21
2.4.2.4 USB Communication .................................................................................... 22
2.4.2.5 Ethernet Communication............................................................................... 22
2.4.2.6 Remote Commands....................................................................................... 23

Model 5000A225A
ii
2.4.2.6.1 Power On/Off.................................................................................................24
2.4.2.6.2 RF On/Off......................................................................................................24
2.4.2.6.3 Reset Faults....................................................................................................25
2.4.2.6.4 Mode Select ...................................................................................................25
2.4.2.6.5 Level Adjust...................................................................................................25
2.4.2.6.6 Identity...........................................................................................................26
2.4.2.6.7 IO Board Firmware Revision.........................................................................26
2.4.2.6.8 Machine State ................................................................................................27
2.4.2.6.9 State ...............................................................................................................28
2.4.2.6.10 Forward Power...............................................................................................29
2.4.2.6.11 Reverse Power ...............................................................................................29
2.4.2.6.12 RF Gain..........................................................................................................30
2.4.2.6.13 Faults..............................................................................................................30
2.4.2.6.14 Operating Hours (RF On) ..............................................................................31
2.4.2.6.15 Operating Hours (Power On).........................................................................32
2.4.2.6.16 Initiate MPA Coolant Temperature and Transistor Currents.........................32
2.4.2.6.17 Query MPA Coolant Temperature and Transistor Currents..........................32
2.4.2.6.18 Remote Operating Timeout ...........................................................................33
2.4.2.6.19 ALC Board Firmware Revision.....................................................................34
2.4.2.6.20 SBB (Piggyback) Firmware Revision............................................................34
2.4.2.6.21 SBB (Optical) Firmware Revision.................................................................35
2.4.2.6.22 System Serial Number ...................................................................................35
2.4.2.6.23 AC Power-On Defaults..................................................................................36
2.4.2.7 Interlocks .......................................................................................................37
2.4.2.7.1 Inhibit Interlock .............................................................................................37
2.4.2.7.2 AC Interlock ..................................................................................................37
2.5 RF Output.............................................................................................................37
2.6 Electrical Power ...................................................................................................37
3. THEORY OF OPERATION.............................................................................39
3.1 General .................................................................................................................39
3.2 Amplifier..............................................................................................................39
3.2.1 Amplifier RF Input...............................................................................................39
3.2.2 A1 2W Pre-Amplifier Assembly (Schematic No. 10041189, 10041352,
10041054).............................................................................................................39
3.2.2.1 A1 Pre-Amplifier Assembly (Schematic 10041189).....................................39
3.2.2.2 A2 Switch Assembly (Schematic 10041352)................................................39
3.2.2.3 A3 2W Amplifier Assembly (Schematic 10041054).....................................39
3.2.3 A10 100W 400MHz Module Assembly (Schematic 10039874)..........................40
3.2.4 Driver Power Supplies (PS1, PS2).......................................................................40
3.2.5 A5 Control/Fault Board (Schematic #10042218,10030013)................................40
3.2.6 A8 Voltage Regulator Board................................................................................41
3.2.7 Splitter, Attenuator...............................................................................................41
3.2.8 Main Power Amplifier Unit (MPA).....................................................................41
3.2.9 Liquid-Cooled Module.........................................................................................41
3.2.10 Output Combiner/Directional Coupler, Detector Assembly................................42
3.3 Power Supply .......................................................................................................42
3.4 Control Circuits....................................................................................................42
3.4.1 Fiber-Optic System Control Link.........................................................................42
3.4.2 Power On/Operate Circuits ..................................................................................43
3.4.3 Automatic Level Control Circuits........................................................................44
3.5 Fault Detection Circuits........................................................................................44
3.5.1 Thermal Faults......................................................................................................44

Model 5000A225
iii
3.5.2 Current Faults ...................................................................................................... 45
3.5.2.1 Over-current .................................................................................................. 45
3.5.2.2 Under-current ................................................................................................ 45
3.5.3 Power Supply Faults............................................................................................ 45
3.5.4 ALC Fault............................................................................................................ 45
3.5.5 Interlocks ............................................................................................................. 45
3.5.5.1 Inhibit Interlock............................................................................................. 45
3.5.5.2 AC Interlock.................................................................................................. 46
3.5.6 System Error (F/O Link Fault)............................................................................. 46
4. TROUBLESHOOTING AND REPAIR.......................................................... 47
4.1. General................................................................................................................. 47
4.3 Fault Signal Interpretation and Diagnosis............................................................ 47
4.3.1 General - Reading Faults ..................................................................................... 47
4.3.2 Power Supply Faults............................................................................................ 48
4.3.3 Thermal Faults..................................................................................................... 48
4.3.4 ALC Fault............................................................................................................ 48
4.3.5 RF Module Faults ................................................................................................ 48
4.3.6 Fault Troubleshooting Guide............................................................................... 49
4.4 Diagnosing and Replacing Amplifier Modules ................................................... 50
4.4.1 Locating Modules................................................................................................ 50
4.4.2 Module Replacement........................................................................................... 51
4.4.3 Cooling System.................................................................................................... 51
Appendix A. Installing Software Upgrades............................................................... 53
A.1 Firmware Updates................................................................................................ 53
A.2 Control - Multi-Purpose Board Assembly Firmware (x1)................................... 53
A.3 I/O - Input Output Board Assembly Firmware (x1) ............................................ 54
A.4 Breakout - Piggy-Back Connected Switch Breakout Board (SBB) Assembly
Firmware (x1) ...................................................................................................... 54
A.5 Breakout - Fiber-Optic Connected Switch Breakout Board (SBB) Assembly
Firmware in MPAs (x4)....................................................................................... 55
A.6 Automatic Leveling Control (ALC) Assembly Firmware (x1) ...........................55
A.7 Assemblies that require physical replacement to update firmware...................... 56
LIST OF FIGURES
1-1 5000A225A AC Line Cord Installation................................................................. 3
1-2 5000A225A Connector Locations (Rear View Left, Front View, Right).............. 5
2-1 Digital Control Panel (DCP) Features ................................................................... 9
2-2 Rear Panel Features ............................................................................................. 10
2-3 Model 5000A225A Interface Block Diagram...................................................... 10
2-4 Control State Diagram ......................................................................................... 11
2-5 Menu Map............................................................................................................ 13
2.6 Inhibit Screen....................................................................................................... 13
2-7 Main Menu Screen............................................................................................... 14
2-8 Select Screen........................................................................................................ 15
2-9 Mode Screen ........................................................................................................ 15
2-10 User Screen.......................................................................................................... 16
2-11 More Screen......................................................................................................... 16
2-12 I/O Screen............................................................................................................ 17
2-13 GPBI Address Screen .......................................................................................... 17
2-14 RS-232 Fiber-Optic Serial Baud Rate Screen...................................................... 16
2-15 Key Beep Screen.................................................................................................. 18

Model 5000A225A
iv
2-16 Remote Screen......................................................................................................19
2-17 Fault Screen..........................................................................................................19
4-1 5000A225A MPA / Module Locations (Rear View) ...........................................50
LIST OF TABLES
2-1 RS-232 Port Settings............................................................................................21
2-2 RS-232 (DCE) Port Pinout Diagram DB-9 Female .............................................21
2-3 Fiber-Optic Serial Port Settings ...........................................................................22
2-4 Relationships between the Model 5000A225A Controls and Remote
Communication....................................................................................................24
2-5 Machine State Response Time .............................................................................27
2-6 Bit Position...........................................................................................................28
2-7 Faults....................................................................................................................30
3-1 Link States............................................................................................................42

Rev B 1
1. GENERAL INFORMATION
1.1 GENERAL DESCRIPTION
The Model 5000A225A is a self-contained, broadband, completely solid-state Radio Frequency (RF)
amplifier designed for applications where instantaneous bandwidth and high gain are required. The amplifier
is air cooled, with internal liquid cooling of the final amplifier stages. Push-pull circuitry is utilized in all
high-power stages to minimize distortion and improve stability. The Model 5000A225A, when used with a
RF sweep generator, will provide a minimum of 5000 watts of swept power covering the frequency range
from 0.01 to 100 MHz, derating to 3500 watts from 100 MHz to 225 MHz. The Model 5000A225A is housed
in a single stylish contemporary equipment cabinet.
Special features incorporated into the Model 5000A225A include the following:
•A Digital Control Panel (DCP) that allows both local and remote (via a computer interface) control of
the amplifier (including adjustment of the amplifier’s RF Gain during CW mode operation) and provides
graphical displays of the amplifier’s Forward and Reflected power levels.
•Automatic Level Control (ALC) by internal circuits or by an external input; with front panel (via the
unit’s DCP) or remote (via the unit’s computer interface) control of the ALC Threshold setting.
•RF output level protection.
•A General Purpose Interface Bus (GPIB)/IEEE-488.2 interface for remote control of the amplifier’s
operating functions.
•RS232 serial communications including both wire and fiber-optic ports for remote control.
•USB and Ethernet Communication ports for remote control.
•Protection is provided by DC current limiting, over-current, under-current, and over-temperature shut
down and RF power limiting.
•Housed in a stylish contemporary equipment rack, the Model 5000A225A provides readily available
RF power for typical applications such as RF susceptibility testing, antenna and component testing, and
wattmeter calibration.
1.2 SPECIFICATIONS
Refer to the AR RF/Microwave Instrumentation Data Sheet at the end of this section for detailed
specifications.

Model 5000A225A
2 Rev B
1.3 POWER SUPPLIES
The Model 5000A225A is a modular design with each section having self-contained power supplies. These
power supplies are self-contained, regulated switching units.
The Main Power Amplifier (MPA) unit has a supply providing +42V as the main source of power for the
amplifier circuitry. Also included in this unit is a +5V supply for logic and control functions and a +24V
supply that runs the coolant pump, heat exchanger fans and main combiner fan.
The Driver/Control (DCU) section contains a +37V supply providing DC power for the power amplifier
module and for the A8 Regulator assembly. It also contains one other power supply: a unit providing +5,
+15, and -15V for control and logic.
1.4 PROTECTION CIRCUITS
Features incorporated into this unit include RF output level protection circuits, thermal protection circuits,
output device current monitoring and limiting of individual power amplifier modules. There is a main system
AC circuit breaker and secondary AC circuit breakers in the Driver/Control unit (DCU) and the main power
amplifier (MPA) unit. Both main switching supplies are short circuit protected. Reaching a threshold of
either of the RF forward (incident) or reverse (reflected) power limit adjustments, which are adjusted to
approximately 5500 watts and 2500 watts respectively, will initiate limiting, or smooth drive level fold-back,
in a low-level stage of the amplifier chain. If the limiting circuits cannot keep the amplifier’s levels below the
limit threshold, the protection circuits will invoke a shutdown of the main power supplies and low-level driver
in the amplifier. Power amplifier modules are monitored for both over-current and under-current. A RESET
function is provided to permit re-powering of the amplifier in case of transient or temporary activation of the
amplifier’s protection circuitry. The low-level driver and output amplifier subassemblies are thermally
monitored.
The cooling system is monitored and protected. Each power amplifier module incorporates a thermal switch
which will shut down the power supplies in the event of an over-temperature condition. Liquid coolant is
monitored for temperature, flow, and level. Over-temperature of the fluid or low coolant level will shut down
the amplifier and send a notification to the front panel display.
The digital control panel monitors all fault signals, stores and displays any that are invoked and asserts the
required action.

Model 5000A225A
Rev B 3
1.5 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.
1.5.1 Location
Select an operating location that will permit free air circulation around the amplifier’s cabinet. The Model
5000A225A 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. For example, do not position the
unit next to a wall or other equipment that would cause a restriction of airflow into or out of the unit.
CAUTION:
Under normal operating conditions, the exhaust air temperature may
exceed 40
°
C. Do not locate heat sensitive equipment, objects or materials
in the exhaust air stream of the unit.
1.5.2 AC Power
Low Voltage Model 10044004: The Model 5000A225A is designed for a primary power input of 200–240
VAC, 50/60Hz, three phase Delta (4-wire).
High Voltage Model 10044005: The Model 5000A225A is designed for a primary power input of 380–415
VAC, 50/60Hz, three phase Wye (5-wire).
CAUTION:
Dangerous voltages are present in the amplifier whenever it is plugged
into an AC outlet. Always disconnect the AC power line to the amplifier
before servicing the unit.
Figure 1-1. 5000A225A AC Line Cord Installation

Model 5000A225A
4 Rev B
Due to the variety of power systems available, line cords are not shipped with this unit. The user must install
the recommended supply line in the unit. The Model 5000A225A requires a line cord having #4 AWG
conductors for low-voltage installations, and #8 AWG conductors for high-voltage installations. To install the
line cord, referring to Figure 1-1, remove the power distribution box cover, located at the middle of the
cabinet, in the rear. Do not cause any wires attached to the rear panel to be pulled tightly. Loosen the strain
relief clamp nut and insert a prepared line cord of the proper gauge and size. Connect the green/yellow earth
ground to the designated ground stud, using the appropriate hardware. Connect the phase and neutral wires to
the top designated terminal studs. There is no special order for the phase wires. Tighten the strain relief nut
and replace the rear panel.
CAUTION:
The primary power must be supplied through a slow-acting, 3-phase
common trip circuit breaker. The use of fuses or individual breakers on
each line may cause damage if only one phase is disconnected.
1.5.3 Driver Output Cables
Driver output cables are normally left connected for shipment. If for any reason they are disconnected, they
must be re-connected. The connectors should be labeled. The cables are of uniform length and can be
interchanged without affecting the operation of the amplifier.
1.5.4 RF MPA Output Cables
If, for any reason, the amplifier has disconnected RF MPA output cables, they must be installed in the proper
positions. The RG393 cables, with Type C right-angle male connectors, attach between the RF MPAs and the
output combiner input ports.

Model 5000A225A
Rev B 5
1.6 OTHER CONNECTIONS
See Figures 1-2 and 2-2.
REMOTE INTERFACE
RF INPUT
MAIN AC BREAKER
SECONDARY AC BREAKERS
AC LINE INPUT
RF OUTPUT
MPA 1
MPA 2
DRIVER CONTROL
UNIT (DCU)
POWER DISTRIBUTION
OUTPUT COMBINER
MPA CIRCUIT
BREAKER
Figure 1-2. Model 5000A225A Connector Locations (Rear View Left, Front View)
1.6.1 Amplifier Input Connector
The RF input N type connector for the amplifier can be located on the front or rear of the driver/control unit.
1.6.2 Amplifier Output Connector
The amplifier RF output connector is a 1-5/8 EIA female type located on the rear of the amplifier.
CAUTION:
Placing the amplifier in the operate mode without a load connected to the
output connector is not recommended.
1.6.3 Safety Interlock Connector
Located on the rear of the driver/control unit is the amplifier I/O panel, which includes remote interface
connectors and safety interlock connectors. The 15-pin D-sub miniature female safety interlock connector
provides two separate interlock loops. Pins 1 and 8 are used for situations where the amplifier can be left on,
but forced into STANDBY mode. This interlock is called Inhibit Interlock. Pins 10 and 14 are used for
situations that demand the safest possible condition, with the AC power to all main circuits disconnected. This
interlock is called AC Interlock. Both loops must be closed, or jumpered, for normal operation.

Model 5000A225A
6 Rev B

touch screen display to indicate the operate
status and fault conditions if an over-
temperature or power supply fault has oc-
curred. The unit can be returned to operate
when the condition has been cleared.
All amplifier control functions and status indi-
cations are available remotely through the
included Remotes Package. The Remotes Pack-
age includes GPIB/IEEE-488 format, RS-232
hardwire and fiber optic, USB, and Ethernet.
The bus interface connector is located on the
back panel and positive control of local or
remote operation is assured by a Local/Remote
keyswitch on the front panel of the amplifier.
Also included with the Remotes Package is a
safety interlock circuit for use with external
safety switch interlocks. This circuit prevents the
amplifier from going into operate mode unless
the external connection is made. A jumper
plug is provided for cases where this function-
ality is not needed.
The export classification for this equipment is
EAR99.
The Model 5000A225A is a solid-state, self-
contained, broadband amplifier designed for
applications where instantaneous bandwidth,
high gain and linearity are required. The am-
plifier is air-cooled using internal self-
contained liquid cooling for high performance
and reliability. A stylish, contemporary enclo-
sure allows for easy portability.
The Model 5000A225A, when used with a
sweep generator, will provide a minimum of
5000 watts of RF power. Included is a front
panel gain control which permits the operator
to conveniently set the desired output level. The
5000A225A is protected from RF input over-
drive by an RF input leveling circuit which con-
trols the RF input level to the RF amplifier first
stage when the RF input level is increased
above 0dBm. The RF amplifier stages are pro-
tected from over-temperature by removing the
DC voltage to them if an over-temperature
condition occurs due to cooling blockage or
fan failure. The Model 5000A225A is
equipped with a Digital Control Panel (DCP)
which provides both local and remote control
of the amplifier. The DCP uses a color LCD
Features
Specifications
5000A225A
 5000 Watts CW
 10kHz–225MHz
 Class A
 Portable
 Full VSWR–
tolerant
 CE & RoHS
Compliant
AR RF/Microwave
Instrumentation
160 School House Rd
Souderton, PA 18964
215-723-8181
For an applications engi-
neer call:800.933.8181
www.arworld.us
ISO 9001 Certified

RATED OUTPUT POWER:
Typical: 5500 watts, min 5000 watts, .01-100MHz
Typical: 4500 watts, min 3500 watts, 100-225MHz
INPUT FOR RATED OUTPUT: 1.0 mW Max
POWER OUTPUT @ 3dB COMPRESSION:
Typical: 5500 watts, min 5000 watts, .01-100MHz
Typical: 4500 watts, min 3500 watts, 100-225MHz
POWER OUTPUT @ 1dB COMPRESSION:
Typical: 5000 watts, min 4000 watts, .01-100MHz
Typical: 4000 watts, min 3000 watts, 100-225MHz
FLATNESS: ±2.0 dB typical, ±2.5 dB maximum
FREQUENCY RESPONSE: 10kHz-225 MHz instantane-
ously
GAIN (at maximum setting): 67 dB minimum
GAIN ADJUSTMENT (Continuous Range) : 20 dB
INPUT IMPEDANCE: 50 ohms, VSWR 2.0:1 maximum
OUTPUT IMPEDANCE: 50 ohms nominal
MISMATCH TOLERANCE: 100% of rated power with-
out foldback up to 6.0:1 mismatch, above which may
limit to 2500W reflected power.
MODULATION CAPABILITY: Will faithfully reproduce
AM, FM, or Pulse modulation appearing on input sig-
nal.
THIRD ORDER INTERCEPT: 74 dBm typical
NOISE FIGURE: 8.5 dB typical
HARMONIC DISTORTION: Minus 30 dBc typical, mi-
nus 20 dBc maximum at 3000 watts
SPURIOUS: Minus 70 dBc typical
PRIMARY POWER (User must specify): 200-240 VAC or
380-415 VAC, 3-phase, 50/60Hz, 20 kWatts
CONNECTORS:
RF Input: N female
RF Output: EIA 1-5/8 male, rear
REMOTES PACKAGE:
IEEE-488: 24-pin female
RS-232: 9-pin subminiature D (female)
Fiber optic: ST Conn Tx and Rx RS-232
USB 2.0: Type B
Ethernet: RJ-45
Safety Interlock: 15-pin subminiature D
COOLING: Forced air, internal self-contained liquid
WEIGHT: 250 kg (550 lbs)
SIZE (W x H x D): 56.1 x 173 x 88.9 cm (22.1 x 68.15
x 35 in)
ENVIRONMENTAL:
Operating Temperature: 5°C / +40°C
Operating Altitude: Up to 2000M
Shock and vibration: Normal Truck Transport
REGULATORY COMPLIANCE:
EMC EN 61326-1
Safety UL 61010-1
CAN/CSA C22.2 #61010-1
CENELEC EN 61010-1
RoHS DIRECTIVE 2011/65/EU
EXPORT CLASSIFICATION: EAR99 
Page 2
Specifications
5000A225A
 5000 Watts CW
 10kHz–225MHz
Ordering Options
Contact your AR RF/Microwave Instrumentation Sales Associate for specific model
configuration pricing.