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BIRD TERMALINE 8894A Operation Manual

Load resistor
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®
TERMALINE
LOAD RESISTOR
MODEL 8894A
Operation Manual
This unit requires the supplied vent plug be installed prior to use.
Operating the unit without the vent plug installed WILL result in equipment damage and may
cause personal injury.
© Copyright 2023 by Bird Technologies, Inc.
Instruction Book Part Number 920-8894A Rev. C
®
®
Termaline
and Tenuline
are Registered Trademarks
of Bird Electronic Corporation

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Summary of Contents for BIRD TERMALINE 8894A

  • Page 1 This unit requires the supplied vent plug be installed prior to use. Operating the unit without the vent plug installed WILL result in equipment damage and may cause personal injury. © Copyright 2023 by Bird Technologies, Inc. Instruction Book Part Number 920-8894A Rev. C ®...
  • Page 3 Safety Precautions Safety Precautions The following are general safety precautions that are not necessarily related to any specific part or procedure, and do not necessarily appear elsewhere in this publication. These precautions must be thoroughly understood and apply to all phases of operation and maintenance. Keep Away From Live Circuits Operating Personnel must at all times observe general safety precautions.
  • Page 4 Termaline® Load Resistor Model 8894A Safety Symbols Warnings call attention to a procedure, which if not correctly performed, could result in personal injury. Cautions call attention to a procedure, which if not correctly performed, could result in damage to the instrument. This symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area.
  • Page 5 On page 4. If installed, connect optional interlock before applying RF power. On page 6 and 8. Connect interlock before RF operation. On page 6. Use only Bird coolant, P/N 5-1070, to prevent damage to the load. On page 11.
  • Page 6 Termaline® Load Resistor Model 8894A Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY PROTECTION. EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIÓN DE SEGURIDAD DEL INSTRUMENTO.
  • Page 7 Safety Precautions SERVICE SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING UNLESS QUALIFIED TO DO SERVICIO LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO.
  • Page 8 Termaline® Load Resistor Model 8894A CONNECT INTERLOCK TO TRANSMITTER BEFORE OPERATING. BRANCHER LE VERROUILLAGE À L'ÉMETTEUR AVANT EMPLOI. CONECTE EL INTERBLOQUEO AL TRANSMISOR ANTES DE LA OPERACION. VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER ANSCHLIESSEN. PRIMA DI METTERE IN FUNZIONE L'APPARECCHIO, COLLEGARE IL DISPOSITIVO DI BLOCCO AL TRASMETTITORE.
  • Page 9 Safety Precautions About This Manual This manual covers the operating and maintenance instructions for the following models: 8894A Changes to this Manual We have made every effort to ensure this manual is accurate. If you discover any errors, or if you have suggestions for improving this manual, please send your comments to our Solon, Ohio factory.
  • Page 10 Table of Contents Safety Precautions ..............i Safety Symbols .
  • Page 11 Table of Contents Shipping the Load Resistor ..............14 Customer Service .
  • Page 12 Chapter 1 Introduction The Bird 8894A Loads are portable, 50 ohm, coaxial RF transmission line terminators, designed for frequency ranges of DC – 2.4 GHz. They provide accurate and dependable low reflection line terminations. RF power is dissipated at a level up to 2500 watts.
  • Page 13 Theory of Operation Load Resistor The Bird 8894A loads consist of a thin-film on ceramic resistor immersed in a dielectric coolant. The resistor, individually selected for its accuracy, is enclosed in a special housing. When surrounded by the coolant, this produces a uniform, practically reflectionless line termination over the specified frequencies.
  • Page 14 If the shipping container is not damaged, unpack the unit. Save shipping materials for repackaging. 2. Inspect unit for visual signs of damage. If there is damage, immediately notify the shipping carrier and Bird Technologies. Site and Shelter Requirements The unit should be operated in a dry, dust and vibration free environment.
  • Page 15 Bird 8894A Loads are equipped for either portable use or fixed installation. The mounting brackets on the front and rear faces have four mounting slots arranged in a 5 ...
  • Page 16 Connector - P/N 2450-018 Installing Thermoswitch Bird 8894A Loads can be equipped with an optional interlock thermoswitch, P/N 8890-008. It is normally closed, opening at 236°C (457°F), with a rating of 10A at 120VAC and 5A at 230VAC. 1. Remove the vent plug.
  • Page 17 Installation Installing the Interlock Connection If installed, connect optional interlock before applying RF power. 1. Unscrew the large knurled ring-nut (A) at the lower end of the coupling jack assembly. 2. Pull the large knurled ring-nut off the thermoswitch jack (B). See Figure 2 on page 6 3.
  • Page 18 Termaline® Load Resistor Model 8894A Connecting RF Power Before first using the load, perform the following steps. 1. Wipe all connectors and insulator surfaces on the transmission line face with a clean soft cloth. 2. Check the RF input connector for signs of wear, damage, or dirt. 3.
  • Page 19 If installed, connect optional interlock before applying RF power. Normal Operation Bird 8894A Loads have no indicators or operating controls. They require no special operating procedures or surveillance when their performance limits are not exceeded. Follow the instructions for the specific transmitter equipment.
  • Page 20 Chapter 5 Maintenance This chapter covers cleaning, inspection, trouble-shooting, and specifications for the Bird 8894A Loads. Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being applied. Leaking RF energy is a potential health hazard.
  • Page 21 Maintenance Routine Maintenance shows the location of components which may be referred to in this section. Figure 3 Figure 3 Maintenance and Repair Locations Clean the Load  The outside surface of the instrument should be wiped free of dust and dirt when necessary. ...
  • Page 22 5 inches (125 mm) below the top surface of the  resistor assembly mounting ring, at ambient temperature. Use only Bird coolant, P/N 5-1070, to prevent damage to the load. 3. Add coolant if necessary. 4. Install the load resistor (See to "Replacing the Load Resistor"...
  • Page 23 Figure 3 on page 10 Replacing the RF Connector The Bird 8894A has a Bird “QC” connector which allows easy changing of the RF connector. This does not disturb the coolant seal or affect the electrical continuity of the load.
  • Page 24 Termaline® Load Resistor Model 8894A Replacing the Load Resistor Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. The potential for electric shock exists. 1. Remove the vent plug. 2. Verify the O-Ring is installed on the shipping plug. 3.
  • Page 25 Any maintenance or service procedure beyond the scope of those in this chapter should be referred to a qualified service center. If the unit needs to be returned for any reason, request an Return Material Authorization (RMA) through the Bird Technologies website. All instruments returned must be shipped prepaid and to the attention of the RMA number.
  • Page 26 Termaline® Load Resistor Model 8894A Specifications Frequency Range DC – 1000 MHz Power Rating 2500 W continuous duty † Peak Power for Pulse Width 150 kW 1 µs 115 kW 10 µs 80 kW 100 µs 54 kW 1000 µs 22 kW 5000 µs Impedance...
  • Page 27 Maintenance Replacement Parts List Description Part Number RF load resistor 8890-050 Resistor O-Ring 5-230 Clamping band assembly 2430-055 Plug Vent 5-1350 Shipping 5-1781 Overtemp thermoswitch 8890-008 Thermoswitch body 8890-005 Thermoswitch jack 2450-018 Coolant, 2.3 gal (8.7 liters) 5-1070 Radiator assembly 8894-012 Access plug 3/4"-14 hex socket 5020-103...
  • Page 28 Termaline® Load Resistor Model 8894A Available “QC” Type Connectors Connector Part Number BNC-Female 4240-125 BNC-Male 4240-132 C-Female 4240-100 C-Male 4240-110 HN-Female 4240-268 HN-Male 4240-278 † 4240-031 LC-Female LC-Male 4240-025 LT-Female 4240-018 LT-Male 4240-012 Mini UHF-Female 4240-346 N-Female 4240-062 N-Male 4240-063 Open Term., # 10-32 Nut 4240-080 SC-Female...
  • Page 29 Limited Warranty All products manufactured by Seller are warranted to be free from defects in material and workmanship for a period of one (1) year, unless otherwise specified, from date of shipment and to conform to applicable specifications, drawings, blueprints and/or samples. Seller’s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted;...