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AR 2500L Operating And Service Manual

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Operating and
Service Manual
2500L
Model
10005070
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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  • Page 1 Operating and Service Manual 2500L Model 10005070 Part Number Serial Number 160 School House Road, Souderton, PA 18964 • 215-723-8181 • Fax 215-723-5688 • www.arworld.us...
  • Page 3 160 School House Road Souderton, Pa. 18964 declare that our product; the Model 2500L, 2500LM1, 2500LM3, 2500LM4, 2500LM5, 2500LM6, 2500LM7 and 2500LM9 RF amplifiers to which this declaration relates is in compliance with the requirements of the; EEC EMC Directive (89/336/EEC) in accordance with Article 10 (2) of the directive, with the provision that the user must install the equipment as directed by the “Instructions for European EMC Conformity”...
  • 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 89/336/EEC. The equipment must therefor be operated in a shielded area which provides a sufficient level of attenuation to meet the radiated emissions and immunity specifications.
  • Page 7 INSTRUCTIONS FOR SAFE OPERATION the power source. Contact may result in personal injury. BEFORE APPLYING POWER Replacement fuses are required to be of specific type and current rating. Review this manual and become familiar with all safety markings and instructions. SAFETY SYMBOLS Verify that the equipment line voltage selection is This symbol is marked on the equipment...
  • Page 9 Variations in alignment and component selection will be determined by the model number ordered. See the amplifier specification sheet for frequency range and power output. The Model 2500L is referenced throughout the text to explain operation. The appropriate model number should be substituted for individual...

  • Page 11: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS ....................i GENERAL INFORMATION ................1 General Description ....................1 Power Supplies ...................... 1 Cooling System...................... 1 Specifications......................1 Installation ......................2 1.5.1 Location ......................... 2 1.5.2 Primary Power Connections .................. 2 1.5.3 Connections to Water Supply (Liquid Cooled Model Only) ......... 4 1.5.4 Coolant........................
  • Page 12 Model 2500L...

  • Page 13: General Information

    1. GENERAL INFORMATION GENERAL DESCRIPTION The Model 2500L is a self-contained, broad band amplifier intended for laboratory applications where instantaneous bandwidth, high gain and high power output are required. When used with a swept frequency signal source it will provide a minimum of 2500 watts of swept CW power. Provisions are included to obtain outputs of 100 watts CW as well as 4000 watts when excited with a gate/blank input in pulse mode having a 15% duty cycle or less.

  • Page 14: Installation

    Model 2500L INSTALLATION Before proceeding, thoroughly inspect the amplifier for signs of physical damage which may have been incurred during shipment and completely read the following installation and operating instructions paying attention to all CAUTION notes. See Envelope Drawing Number 10020178.
  • Page 15 Model 2500L CONNECT TO WIRE FROM 200 VAC 208 VAC A9K2-6 A8T1-Z1 A8T1-X1 A9K2-5 A8T1-Z2 A8T1-X2 A9K2-4 A8T1-Z3 A8T1-X3 A9K3-T1 T2-X1 T2-W1 A9K3-T2 T2-X2 T2-W2 A9K3-T3 T2-X3 T2-W3 A9K4-T1 T2-Z1 T2-Y1 A9K4-T2 T2-Z2 T2-Y2 A9K4-T3 T2-Z3 T2-Y3 See Schematic Diagram Number 10019257.

  • Page 16: Connections To Water Supply (Liquid Cooled Model Only)

    Model 2500L 1.5.3 Connections to Water Supply (Liquid Cooled Model Only) Before the unit is turned on, connections must be made to the cooling water taps located on the upper rear panel. A tap water source such as is normally encountered in the average building with a minimum flow rate of 5 GPM (19 liter/min.) and a maximum temperature of 20°C is required.

  • Page 17: General Caution Notes

    Model 2500L 1.5.4.1 Connections to Remote Heat Exchanger (Remote Air Cooled Models Only) The remote heat exchanger must be connected before power is applied to the unit. Remove the two upper side panels and rear panel from the amplifier cabinet. Insert the male end of each coolant hose supplied through the rear panel opening into a quick disconnect located on the pump assembly.
  • Page 18 CAUTION: Do not exceed a gating/blanking input pulse width of 8 milliseconds 15% duty cycle and/or a repetition rate of 2 khz for the Model 2500L. Do not use the gating/blanking circuit as a means of turning the unit off and on for long periods of time.
  • Page 19 Housed in a stylish contemporary enclosure, the Model 2500L is smaller than competitive units with similar power levels. All operating controls are functionally grouped on the front panel for simplicity of operation. These include modern, lighted push button switches for the command functions, POWER, STANDBY, OPERATE and Low Range, a control for setting the output level of the amplifier, and a meter for monitoring critical operating voltages and currents.
  • Page 20 SPECIFICATIONS, MODEL 2500L POWER OUTPUT High Range Pulse Minimum ............4000 watts to 150MHz 3000 watts to 220MHz Duty Cycle ............15% Pulse Width ............8 milliseconds Minimum ............2500 watts minimum Linear @ 1dB compression ........1750 watts nominal 1250 watts minimum Low Range ..............
  • Page 21 RF Input RF Output, RF Output, Gating/Blanking Primary Power high range low range Input All are 3 phase, 50/60 Hz 2500L Type BNC(F), front Type C(F), front Type N(F), front Type BNC(F), front 200/208 VAC 380/415 VAC 2500LM1 Type BNC(F), rear...

  • Page 23: Operating Instructions

    INPUT LOW RANGE HIGH RANGE Figure 2-1. Model 2500L Front Panel To place the unit in operation, perform the following steps. 1. Connect primary power as outlined in Section 1.5.2. 2. Turn on the 3-phase circuit breaker located on the power supply chassis inside the rear door. Turn on key switch.
  • Page 24 Model 2500L assembly. Pressure should read 37-43 psig. NOTE: Snubber valve below gauge must be opened to obtain pressure readings. 4. Depress the white power switch located on the front panel and observe the white power indicator light. If this light is on, the amplifier is receiving primary power and has activated the tube filaments.
  • Page 25 Figure 2-2. Block Diagram d) Set pulse generator #2 for a pulse having the following characteristics. Duty Cycle 15% or Less Repetition Rate 2 kHz Maximum for Model 2500L Width 8 Milliseconds Maximum Rise and Fall Time 100 Nanoseconds Maximum Voltage Plus or Minus 2.5 to 6.0 VDC...
  • Page 26 CAUTION: Do not exceed a gating/blanking input pulse width of 8 milliseconds and/or a repetition rate of 2 kHz for the Model 2500L. j) Depress the green Operate switch; the green Operate light should light. If not, the gating/blanking input may need adjustment.
  • Page 27 Model 2500L 14. To turn the amplifier off, first return to Standby (see Step 11 above) and then depress the power switch and observe the white power indicator light. When this goes out the unit is turned off. However, in the case of a rapid shut down sequence, the green Operate indicator light may still be on indicating that the high voltage supply bleeder circuit has not fully discharged the power supply.
  • Page 28 Model 2500L Rev A...

  • Page 29: Theory Of Operation

    3. THEORY OF OPERATION INTRODUCTION See Block Diagram Number 10019261. The amplifier is a broad band configuration that requires no tuning over the entire frequency band. It is a hybrid type that utilizes a solid state low level amplifier, a vacuum tube driver amplifier, and a vacuum tube final amplifier.

  • Page 30: Driver Amplifier

    Model 2500L the amplifier. The output of Q4 and Q5 are coupled through matching transformer T2 to a coaxial connector, which in turn is connected to the input of the driver amplifier. Power gain of each of the cascaded stages is approximately +10dB and +13dB for the push-pull stage, giving an overall gain of better than +40 dB for the amplifier.

  • Page 31: Final Amplifier

    Model 2500L Approximate voltages for the driver amplifier are shown in the following table. MODE CLASS SCREEN VOLTAGE PLATE VOLTAGE High Range Low Range FINAL AMPLIFIER See Schematic Diagram Number 10019256. The principle of operation of the final amplifier is similar to that of the driver amplifier. This includes grid and plate lines, input and output matching networks, screen supply, and bias supply.
  • Page 32 With the RF pulse within the confines of the gate pulse, the following results will be obtained. The video components are centered at approximately 1 kHz for the Model 2500L. Should the presence of these low frequency components cause difficulties in the use of the amplifier, consult the factory for suggestions for appropriate filtering methods.

  • Page 33: Power Supply

    Model 2500L When the amplifier is operating in the CW mode, the RF input may be of any configuration desired; however, pulses will have their peak pulse power restricted to the CW output rating. No syncing with the gating/blanking circuit is required and any duty cycle up to CW may be used.
  • Page 34 Model 2500L 3.6.1.1 Crowbar Assembly, A1 See Schematic Diagram Number 10019266. This plug-in circuit board serves several functions. These functions are; crowbar SCR driver, operate disable timer, and blank on operate. The module utilizes a four section electronic timer (U1) that provides constant amplitude pulses of preset length from each section.

  • Page 35: Control Panel Assembly, A4

    Model 2500L 3.6.1.3 Gating/Blanking Switch Circuit, A3 See Schematic Diagram Number 10019282. The blanking input at J1-8 provides gate voltage to Q1 and Q2 in CW mode. The duration of this voltage from the gating/blanking board results in no power output from the driver or final amplifiers due to screen voltages being clamped to ground by Q1 and Q2.
  • Page 36 Model 2500L The preset relief valve located inside the coolant reservoir provides a pressure of approximately 40 psig to the final amplifier resulting in a coolant flow of approximately 4 to 5 GPM. NOTE: The relief valve setting should not be changed.

  • Page 37: Rear Panel Assembly

    Model 2500L 3.6.4 Rear Panel Assembly See Block Diagram Number 10019261. The rear panel assembly contains the following. Interlock Circuit Assembly Overload Comparator Assembly Timer Assembly Operate Circuit Assembly Meter Circuit Assembly Line Phase Detector Regulator Assembly Regulator Assembly Regulator Assembly Regulator Assembly, Dual Rectifier/Filter Assembly, L.V.
  • Page 38 Model 2500L sufficiently, the related transistor will be turned on and the red bias indicator (DS8) will light and the relay will be activated. Again, the system interlock will open and the amplifier will not go into standby or operate.
  • Page 39 Model 2500L switch (S1) also permits short cycling for test purposes only and should not be used when the driver and/or final amplifier is installed. 3.6.4.4 Operate Circuit, A13 See Schematic Diagram Number 10019260. The operate circuit is contained on a plug-in printed circuit board and serves to switch low power control voltages between various modules and sub-assemblies.
  • Page 40 Model 2500L all the coolant oil if a leak should develop in the unit. This circuit also prevents the pump from being energized if the coolant level is below normal initially. 3.6.4.7 Regulator Assembly, A16, A20 and A21 See Schematic Diagram Number 10019279.
  • Page 41 Model 2500L 3.6.4.9 Rectifier/Filter Assembly, A19 See Schematic Diagram Number 10019284. The rectifier/filter assembly consists of two independent circuits. The first circuit consists of full wave rectifier CR1 and CR2 and filter capacitor C1. The unregulated output is routed to the driver and final bias regulators A20 and A21 respectively.
  • Page 42 Model 2500L Rev A...

  • Page 43: Maintenance

    RF section involved be returned to the factory for part replacement and amplifier realignment. Do not return entire unit. Shipping instructions are as follows. Ship PREPAID to: AR Worldwide 60 School House Road Souderton, PA 18964 DISASSEMBLY PROCEDURES CAUTION: Turn unit off and disconnect primary power cablebefore servicing.

  • Page 44: Final Amplifier

    Model 2500L 4.2.1.2 Access For Tube Replacement (Refer Also to 4.4.1) After the driver amplifier has been removed from the cabinet, access for tube replacement may be accomplished by removing the top cover. 4.2.1.3 Access To Grid Line This may be accomplished by removing the bottom cover of the driver amplifier.

  • Page 45: Removal Of Printed Circuit Boards From Rear Panel Of Power Supply

    Model 2500L 4.2.3 Removal of Printed Circuit Boards from Rear Panel of Power Supply Open hinged door on rear of unit. Unscrew panel fastener and remove two (2) flat head screws securing inner and outer panels together. Remove all plugs on assembly to be removed.

  • Page 46: Troubleshooting

    Model 2500L A coolant filter has been built into the coolant system primarily for the purpose of trapping any foreign matter which may have been in the system at initial assembly. Under normal operating conditions it should never be necessary to change this filter. However, the filter should be changed periodically if the amplifier is operated in a dusty atmosphere such that contaminants could enter through the reservoir vent.

  • Page 47: Tube Replacement Procedure

    Model 2500L Replacement of more than several tubes would require returning the unit to the factory for realignment if optimum performance is desired. 4.4.1 Tube Replacement Procedure CAUTION: Do not disturb the coils near the tube anodes since their adjustment is critical to the amplifier alignment.

  • Page 48: Procedure For Adjusting Driver And Final Amplifier Grid Bias

    Model 2500L 4.4.2 Procedure For Adjusting Driver and Final Amplifier Grid Bias For this adjustment, the unit must be in the operate status with no signal present at the input. A21 Driver Bias Regulator Monitor TP11 to TP12 on Test Point Board. Set meter switch on the control panel to driver plate (amps).
  • Page 49 Model 2500L 4.4.3.2 Arcing or Gassy Tube Remove RF section (driver and/or final) from unit. See Section 4.2, Disassembly Procedures. Remove top cover. Defeat interlock switch. Darken room. Turn on power. After time delay has elapsed and unit is in Standby, momentarily depress operate switch.

  • Page 50: Servicing Etched Circuit Boards

    Model 2500L 4.4.3.4 Shorted Screen (Will Not Result In Overload Shut down) Remove RF rack (driver and/or final). See Section 4.2, Disassembly Procedures. Remove bottom cover from unit. See Section 4.4.3, caution #3. Defeat interlock switch. Turn on power. After time delay has elapsed and unit is in standby, momentarily depress operate switch.
  • Page 51 If warranty service is not available in the country where the equipment is to be used, it must be returned to AR RF/Microwave Instrumentation. Warranty service will be provided only for defective goods which are returned within the warranty period, freight costs prepaid to AR RF/Microwave Instrumentation or its designated repair facility.

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10005070

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