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AR 8300TP8G12 Operating And Service Manual

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Operating and
Service Manual
8300TP8G12
Model
10031734
Part Number
Serial Number
160 School House Road, Souderton, PA 18964 • 215-723-8181 • Fax 215-723-5688 •
www.arworld.us

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Summary of Contents for AR 8300TP8G12

  • Page 1 Operating and Service Manual 8300TP8G12 Model 10031734 Part Number Serial Number 160 School House Road, Souderton, PA 18964 • 215-723-8181 • Fax 215-723-5688 • www.arworld.us...
  • Page 3 Amplifier Research 160 School House Road Souderton, PA. 18964 declare that our product(s); the Model 8300TP8G12 series RF amplifiers to which this declaration relates is in compliance with the following European directives: Low Voltage Directive: 2014/35/EU EMC Directive: 2014/30/EU Supplementary Information:...
  • 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 BEFORE APPLYING POWER Indicates a terminal intended for connection to Your AR equipment may have more than one power supply an external conductor for protection against cable. Use only approved power cable(s). If you have not been...
  • Page 8 EQUIPMENT CONTAINING LASERS should fundamental AR Field Probes (FL/PL Series) and Field Analyzers consideration of every user. An (FA Series) are Class 1 laser products containing authoritative guideline for eliminating unwarranted risk of embedded Class 4 lasers. Under normal use, the...
  • Page 9 ADDITIONAL WARNINGS & NOTES WARNING: This equipment operates at potentially lethal voltages. Only trained, qualified personnel should operate, maintain, or service it. 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.

  • Page 11: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS ....................I DESCRIPTION AND SPECIFICATIONS ............1 TWTA Description ....................1 Suggested Applications ..................1 Specifications ......................1 Accessories ......................1 Test Data Sheet ...................... 2 THEORY OF OPERATION ................5 Design of the Amplifier ..................5 Description of the RF Subsystem ................

  • Page 13: Description And Specifications

    Equipment calibration • General laboratory instrumentation SPECIFICATIONS Refer to the AR Data Sheet at the end of this section for detailed specifications. ACCESSORIES AR RF/Microwave Instrumentation offers a number of accessories for use with this amplifier including: • Directional coupler •...

  • Page 14: Test Data Sheet

    Model 8300TP8G12 TEST DATA SHEET A Test Data Sheet for a specific unit is prepared at the time of manufacture and is included with the unit's copy of this manual. Rev B...
  • Page 15 Specifications Features The Model 8300TP8G12 is a self contained, forced air The rated power is developed by efficiently power 8300TP8G12 cooled, broadband traveling wave tube (TWT) micro- combining the outputs from two 5000 watts (nominal) wave amplifier system designed for pulse applications...
  • Page 16 RF output sample port 60dB coupling factor. would have option E3H front pull handles installed. This option also removes reflected sample port. 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)

  • Page 17: Theory Of Operation

    2. THEORY OF OPERATION DESIGN OF THE AMPLIFIER The 8300TP8G12 TWT amplifier consists of two main subsystems. The power supply subsystem and the RF subsystem, which are discussed in sections 2.2 and 2.3, respectively. These two subsystems work in conjunction with the control system. The heart of the microprocessor control system is the CPU board.

  • Page 18: Description Of The Power Supply Subsystem

    Model 8300TP8G12 DESCRIPTION OF THE POWER SUPPLY SUBSYSTEM The TWT power supply is of modular construction. All modules are connected through a motherboard, and are very easy to replace. This makes maintenance fast and easy. Low Voltage Module: AC/DC converter which generates the +15VDC/-15VDC/+5VDC needed for housekeeping.

  • Page 19: Description Of Electronic Crowbar

    Model 8300TP8G12 Interconnects between the power supply modules are through a motherboard. It is installed in a finned heat sink assembly to which the modules are bolted. The incoming cabinet air, boosted by a 400Hz fan, cools the heat sink.
  • Page 20 Model 8300TP8G12 Crowbar Driver Board The Crowbar Driver Board contains the actual crowbar switch, which is a triggered gas gap between the cathode supply and ground. The gap has a self-breakdown voltage of 20KV and will not fire when cathode voltage is applied to it unless triggered by a high voltage pulse to its trigger electrode.

  • Page 21: Operation

    3. OPERATION WARNINGS AND CAUTIONS Throughout this manual, the symbol: WARNING: Indicates that a hazard exists that may result in personal injury or loss of life. CAUTION: Indicates that failure to follow procedures may result in damage to the equipment. WARNING: DANGER - High Voltage Present: Electrical equipment in this TWTA generates and stores high-voltage energy that can result in fatal electrocution.

  • Page 22: Installation

    Model 8300TP8G12 INSTALLATION 3.2.1 Unpacking Upon receiving the TWTA, unpack the unit and inspect it for obvious signs of external damage. If damage is observed, notify the carrier and contact an authorized service representative. Save and store the shipping container in case the unit needs to be returned in the future for calibration or repair.

  • Page 23: Cooling Requirements

    Model 8300TP8G12 3.2.3 Cooling Requirements The TWTA is provided with a number of cooling fans. It is important that air movement around the rear of the unit be unobstructed. CAUTION: Do not position the TWTA in such a way that the air intakes or outlets are blocked, or that the exhaust air flow is directed into air intakes.

  • Page 24: Rf Connections

    Model 8300TP8G12 CAUTION: Main supply voltage fluctuation not to exceed the nominal voltage range of 190-260 VAC. 3.2.5 RF Connections The RF output connector is type WR-90 waveguide. The RF input connector is type N. CAUTION: Never operate the TWTA without a matched output load rated for at least 15,000 watts, peak and 1000W continuous.

  • Page 25: External Interlock Connector

    Model 8300TP8G12 Not seated fully CORRECT INCORRECT 7. Align waveguide with receptacle. Loosely install all hardware. If the waveguide does not align properly, do not proceed. 8. Tighten hardware in a crisscross pattern to assure even torque distribution. Double check that all hardware has been tightened fully to ensure no leakage.
  • Page 26 Model 8300TP8G12 External Inhibit: If you have an external waveguide switch(es), and your hot switch, there is a need to inhibit the RF beam during switch transition to protect the TWT from VSWR. On the external inhibit connector, J2, pins 10 and 11 are provided for this (normally closed). If there are no external waveguide switches, install a jumper between J2-10 and J2-11.

  • Page 27: Front Panel Features

    Model 8300TP8G12 FRONT PANEL FEATURES Figure 3-1. Front Panel Features Table 3-1. Front Panel Features Label Title Function Keylock Switch Allows operator to inhibit the TWTA, to enable front panel control or to enable computer control. S1…S4 “Soft Key” pushbuttons: various menu selection functions...

  • Page 28: Front Panel Display And Soft Keys

    Model 8300TP8G12 FRONT PANEL DISPLAY AND SOFT KEYS 3.4.1 Overview The purpose of the front panel display is to permit the operator to access extensive information about the condition and operation of the TWTA. To accomplish this, a number of informational screens are programmed.

  • Page 29: Menu Screens

    Model 8300TP8G12 3.4.2 Menu Screens Figure 3-2. Front Panel Display Screens Menu Screens - The screens at the highest level are called menu screens. There are four menu screens. At power on, the MENU 1 screen is displayed. Each of the menu screens has the soft key S4 labeled MORE. The MORE key (S4) causes the next menu screen to appear.
  • Page 30 Model 8300TP8G12 In short, MORE permits scrolling through the menu screens. The EXIT key returns display to MENU 1 from any other menu screen. The menu screens display system status and parameter levels. They are configured as follows: MENU 1...
  • Page 31 Model 8300TP8G12 After activating the Sleep Mode: Screen will display Cooling On while heaters cool down. System Off notifies user that the amplifier is in Sleep Mode To de-Activate Sleep Mode: Press the ON soft key to de-activate Sleep Mode. Amplifier will return to MENU 1.
  • Page 32 Model 8300TP8G12 Factory Service Screens - A number of screens intended for factory service and calibration are behind passwords and are not accessible to the user. System Malfunction Screens - A number of screens are reserved to display error messages. These messages are not normally seen and indicate a malfunction of the TWTA.

  • Page 33: Rear Panel Features

    Model 8300TP8G12 REAR PANEL FEATURES Figure 3-3. Rear Panel Features Table 3-2. Rear Panel Features Label Title Function AC Input Circular AC Input connector: 190-260VAC External Interlock Connector for remote interlock and inhibit functions: D-Sub 15-pin female RF Input RF Input: Type N female...

  • Page 34: Initial Turn On And Warm-Up Procedure

    Model 8300TP8G12 INITIAL TURN ON AND WARM-UP PROCEDURE 3.6.1 Before Applying Power 1. Verify that the equipment line voltage is compatible with the TWTA. NOTE: If the user does not have a 5VDC max TTL signal pulse connected to the pulse input BNC connector, there will be no RF output.

  • Page 35: Remote Ieee-488 Operation

    Model 8300TP8G12 11. Observe that the helix current is sensitive to the RF drive level of the TWT. It is at a minimum with no RF drive. The helix currents with no drive and with rated RF output mid-band are logged on the test data sheet.
  • Page 36 Model 8300TP8G12 Command Function Units Response format RDTWTOTC Returns TWT overtemp warning setpoint (°C) °C TWTOTC=[ ]C STWTOTC Sets TWT overtemp warning setpoint (°C) °C RDIWOC Returns helix overcurrent warning setpoint IwOC=[ ] SIWOC Sets helix overcurrent warning setpoint RDLOGIC...
  • Page 37 Model 8300TP8G12 Table 3-4. Catalog of Status Codes (The RDSTAT command causes the TWTA to return a string in the form STATUS=[code], where [code] is an ASCII number whose meaning is given below) Status Code Meaning No command was given.
  • Page 38 Model 8300TP8G12 Table 3-6. Catalog of System State Codes (The RDLOGIC command causes the TWTA to send a string containing an operational state code consisting of 4 ASCII characters representing hex digits. The response is in the form Sys:[w][x][y][z][eol] where the hex...
  • Page 39 Model 8300TP8G12 Table 3-8. *STB?; Response Codes (The command *STB?; causes the TWTA to send a string containing an operational state code consisting of 2 ASCII characters representing hex digits. The response is in the form STATUS:[x][y][eol] where the hex...

  • Page 40: Twta General Considerations

    Cooling during Operate Mode: AR TWTAs have their air outlets and inlets on the rear panels. It is important to prevent the heated air, which is expelled from the TWTA’s air outlets, from being recycled into the air inlets.
  • Page 41 Model 8300TP8G12 Noise Power Density (NPD): TWTAs produce RF noise over their operating frequency range, as specified by the Noise Power Density (NPD). This noise is significantly higher than the noise produced by typical solid state amplifiers, and is inherent in present TWTAs. The noise may surprise users new to TWTAs when it accumulates and results in a significant indication in a broadband measurement device –...
  • Page 42 Model 8300TP8G12 when the TWTA is in the Operate mode (high voltage is on) but gating (control) input is set so that the grid turns off the TWT beam current. Operational procedures should also limit the time in this mode.

  • Page 43: Maintenance

    4. MAINTENANCE The TWTA requires a minimum of routine maintenance. The only moving parts are the elements of switches, relays and blowers. Preventive maintenance is recommended in Paragraph 4.3. In the event that the TWTA needs repairs, it is recommended that the unit be returned to the factory. However, some user service organizations may choose to perform their own corrective maintenance, and under some circumstances returning the unit to the factory may be impractical.
  • Page 44 Model 8300TP8G12 If there is accumulated dust on any of the air intake filters, remove them and clean them with dry compressed air. If the filters show signs of deterioration, purchase replacement units. If significant dust has been noted on the air intake filters, it may be desirable to vacuum the dust and debris from inside the enclosure.

  • Page 45: Troubleshooting

    Model 8300TP8G12 TROUBLESHOOTING Symptom Possible cause TWT or power supply overtemperature Air inlet filter(s) dirty Collector heat sink dirty Inadequate clearance behind TWTA High air inlet temperature Defective fan or fan driver No response when main power turned on Disconnected power cable Defective circuit breaker Control module display does not come up;...
  • Page 46 Model 8300TP8G12 Rev B...

  • Page 47: Technical Documentation

    5. TECHNICAL DOCUMENTATION NOTE: The purpose of this technical documentation section is to provide a guide to the TWTA for technician- level servicing. It is intended for use by qualified technical personnel who must troubleshoot and repair the TWTA in the field. Such repairs are typically limited to replacement of modules or major components.
  • Page 48 Model 8300TP8G12 Rev B...
  • Page 49 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.
  • Page 50 Model 8300TP8G12 Rev B...

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