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Operating and Service Manual 7400TP4G8M10 Model 10042906 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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EC Declaration of Conformity Amplifier Research 160 School House Road Souderton, PA. 18964 declare that our product(s); the Model 7400TP4G8 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: Safety : EN 60215-1:1989...
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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.
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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...
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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...
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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.
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 ................
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Model 7400TP4G8 FIGURES Front Panel Features .................... 15 Front Panel Display Screens ................17 Rear Panel Features ..................... 21 TABLES Front Panel Features .................... 15 Rear Panel Features ..................... 21 Catalog of IEEE-488 Commands ................. 23 Catalog of Status Codes ..................25 Catalog of Fault Codes ..................
General laboratory instrumentation SPECIFICATIONS Refer to the Amplifier Research 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 • Antenna •...
Model 7400TP4G8 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...
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Industrial and University Research series of menus via soft keys. Status indicators and Development, and Service applications. AR include power on, warm-up, standby, operate, also offers a broad range of amplifiers for CW faults, excess average or peak reflected power (Continuous Wave) applications.
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190-260VAC single phase, 50/60Hz, 5kVa Model number example: Model 7400TP4G8M2 would have option E3H front pull handles installed 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...
2. THEORY OF OPERATION DESIGN OF THE AMPLIFIER The 7400TP4G8 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.
Model 7400TP4G8 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.
Model 7400TP4G8 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. DESCRIPTION OF ELECTRONIC CROWBAR Because the charge in the Cathode voltage capacitor storage module exceeds the maximum energy which can be safely dissipated during a TWT tube arc, the 83PC is provided with an electronic crowbar which can shunt...
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Model 7400TP4G8 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.
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.
Model 7400TP4G8 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.
Model 7400TP4G8 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.
Model 7400TP4G8 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 WRD-350 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.
Model 7400TP4G8 6. Gasket must be seated completely in waveguide groove. Note: If the gasket is not seated fully, it will pinch between the two parts and impair the connection. See below: Not seated fully CORRECT INCORRECT 7. Align waveguide with receptacle. Loosely install all hardware. If the waveguide does not align properly, do not proceed.
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Model 7400TP4G8 External Inhibit: If you have an external waveguide switch(es), and you 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.
Model 7400TP4G8 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 Standby Pushbutton: turns high voltage and heater off Exit...
Model 7400TP4G8 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.
Model 7400TP4G8 3.4.2 Menu Screens Figure 3-2. Front Panel Display Screens Rev B...
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Model 7400TP4G8 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.
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Model 7400TP4G8 (Sleep Mode activated). This eliminates excessive STANDBY hours on the TWTs while still permitting remote capability to turn on the amplifier. 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.
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Model 7400TP4G8 MENU screens. Line 3 of MENU 1, which normally displays the operational state of the TWTA, is used as a fault display line until the fault is cleared. When the fault clears the system will automatically resume the standby state and high voltage on will be enabled once again.
Model 7400TP4G8 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 FWD Sample Forward Power Sample Port: -60dB coupling factor, Type N female REV Sample...
Model 7400TP4G8 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.
Model 7400TP4G8 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.
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Model 7400TP4G8 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 Returns logic state code (see Table 6) Sys=[ ] Returns gain...
Model 7400TP4G8 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. Last command was successful.
Model 7400TP4G8 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 values of [w],[x],[y] and [z]are formed as shown below) z bit Meaning...
Model 7400TP4G8 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 values of [x] and [y] are formed as shown below) y bit Meaning...
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.
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Model 7400TP4G8 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 –...
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Model 7400TP4G8 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. Rev B...
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.
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Model 7400TP4G8 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.
Model 7400TP4G8 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;...
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.
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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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