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®
TERMALINE
DUAL LOAD RESISTOR
SEMICONDUCTOR
MODEL 8931A400
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 P/N 920-8931A400 Rev. B
Termaline® and Thruline® are Registered Trademarks
of Bird Electronic Corporation
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Summary of Contents for BIRD 8931A400-115
- 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 P/N 920-8931A400 Rev. B Termaline® and Thruline® are Registered Trademarks...
- 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 applied to all phases of operation and maintenance. Keep Away From Live Circuits Operating personnel must at all times observe normal safety regulations.
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Page 4: Safety Symbols
Semiconductor Termaline Dual Coaxial Load Resistor 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 indicates that a shock hazard exists if the precautions in the instruction manual are not followed. -
Page 5: Warning Statements
Safety Precautions Warning Statements The following safety warnings appear in the text where there is danger to operating and maintenance personnel and are repeated here for emphasis. The load weighs 150 lbs (68 kg), do not attempt to lift alone. Two or more people, or mechanical assistance, are required to lift the load. -
Page 6: Caution Statements
See Page 5 If installed, connect optional interlock before applying RF power. See Page 7 Use only Bird coolant, P/N 5-1070, to prevent damage to the load. See Page 12... -
Page 7: Safety Statements
Safety Precautions 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. BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN. - Page 8 Semiconductor Termaline Dual Coaxial Load Resistor 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 SO. SERVICIO LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO.
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Page 9: About This Manual
Chapter Layout Introduction — Describes the features of the Bird Termaline RF Load Resistor lists equipment supplied and optional equipment, and provides power-up instructions. Theory of Operation — Describes how the Termaline RF Load Resistor works and its functions. -
Page 10: Table Of Contents
Table of Contents Safety Precautions ..............i Safety Symbols . - Page 11 Table of Contents Fuse Replacement ............... . . 16 Fan Replacement .
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Page 12: Chapter 1 Introduction
Chapter 1 Introduction Bird 8931A400 Dual Resistor Semiconductor Loads are portable, 50 ohm, coaxial RF transmission line terminations. They are designed for frequency ranges of DC – 30 MHz. They provide accurate, dependable, and low reflection line terminations. The load has two resistors and two connectors allowing easy dual-frequency high precision measurements. - Page 13 Introduction Figure 1 8931A400 Outline Drawing...
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Page 14: Chapter 2 Theory Of Operation
Theory of Operation Load Resistor Bird 8931A400 loads consist of dual thin-film-on-ceramic resistors immersed in the same dielectric coolant. The resistors, individually selected for accuracy, are enclosed in a special housing. When surrounded by the coolant, this produces a uniform, practically reflectionless line termination over the specified frequencies. -
Page 15: Chapter 3 Installation
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 16: Mounting
Semiconductor Termaline Dual Coaxial Load Resistor Mounting This load is designed for operation in a horizontal position only, with the vent plug up. Do not use in any other manner. The load is intended for stationary or fixed use. The mounting brackets on the front and rear faces have four mounting holes arranged in a 7”... - Page 17 Installation 3. Clean the connector if necessary. Use a self-drying, non-residue forming contact cleaner on the interior portions of the connector. 4. Check the input resistance of the load. Refer to for details. "RF Assembly Resistance Test" on page 13 5.
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Page 18: Chapter 4 Operating Instructions
Blower Controls Bird 8931A400 Loads are equipped with an indicator light on the front of the blower, underneath the RF connector. The blower will turn on whenever the unit is connected to AC power. The indicator light, labeled “AC ON”, will also turn on. -
Page 19: Emergency Shutdown
Operating Instructions Emergency Shutdown Turn off RF power at the source. -
Page 20: Chapter 5 Maintenance
Chapter 5 Maintenance This chapter covers cleaning, inspection, trouble-shooting, and specifications for Bird 8931A400 Loads. Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. The potential for electric shock exists. Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being applied. -
Page 21: Routine Maintenance
Maintenance Routine Maintenance shows the location of components which may be referred to in this section. Figure 2 Figure 2 Maintenance and Repair Locations (2) CLAMPING BANDS AND O-RINGS (2) “QC” RF CONNECTORS FUSE DRAWER SIDE BAFFLE SCREWS AC ON FAN GRILL Inspect the Load ... -
Page 22: Clean The Blower Assembly
Semiconductor Termaline Dual Coaxial Load Resistor Clean the Blower Assembly The intake grills, fans, and inside of the baffles should be wiped free of dust and dirt when necessary. When the blower assembly is installed, it will be necessary to partially disassemble the blower to clean the load’s radiator fins. -
Page 23: Inspect The Coolant
" (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... -
Page 24: Rf Assembly Resistance Test
Semiconductor Termaline Dual Coaxial Load Resistor RF Assembly Resistance Test These tests are by no means a necessity to the operation of the load but merely guidelines for the users information. Accurate measurement of the DC resistance between the inner and outer conductors of the RF input connector will provide a good check of the condition of the load resistor. -
Page 25: Repair
The potential for electric shock exists. RF Connector Replacement The 8931A400 has Bird “QC” connectors which allow easy changing of RF connectors. This does not disturb the coolant seal or affect the electrical continuity of the load. To change a connector: ... -
Page 26: Indicator Light Replacement
Semiconductor Termaline Dual Coaxial Load Resistor 11. Replace the entire load resistor assembly. It cannot be further disassembled. 12. Put the clamping band in place and tighten it. 13. Lower the unit back onto its feet. 14. Check all seals for signs of leaks. The vent plug must be installed at all times when the unit is in operation or cooling. -
Page 27: Fuse Replacement
3. Replace both fuses. See table below for fuse type and current rating. 4. Press the drawer into the AC module until it locks into place. 5. If the fans still do not run or if the fuse burns out again, return the unit to Bird for service. AC Line Voltage... -
Page 28: Fan Replacement
Semiconductor Termaline Dual Coaxial Load Resistor Fan Replacement When ordering a replacement fan, be sure to specify the model, the fan part number, AC voltage, and fan position. The fan will be provided with lugs and leads of the right length for direct attachment to the terminal block. Different fans are used in the 115V and 230V loads. - Page 29 Maintenance With the shipping plugs installed, it is not necessary to empty out the coolant. 5. Wrap the connector in padding. 6. Pack and brace the load in a sturdy wooden crate for shipment. All instruments returned for service must be shipped prepaid and to the attention of the Customer Service Group.
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Page 30: Customer Service
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 31: Replacement Parts
Maintenance Replacement Parts DESCRIPTION PART NUMBER RF Load Resistor 8931A405 Resistor O-Ring 5A2663-1 Clamping Band Assembly 5A2662 Plugs Vent 2450-094 Shipping 2450-049 O-Ring 5-504 Coolant, 6.7 gal (23 liters) 1 gallon container 5-1070-2 5 gallon container 5-1070-3 Radiator Assembly 8921A127 Blower Assembly 115 V 8931A311-1... -
Page 32: Limited Warranty
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;...
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