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Summary of Contents for BIRD TERMALINE 8251 Series
- Page 1 ® TERMALINE LOAD RESISTOR SERIES 8251 Operation Manual ©Copyright 2016 by Bird Technologies, Inc. Instruction Book Part Number 920-8251S Rev. G Termaline® is a Registered Trademark of Bird Electronic Corporation...
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Page 2: 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. WARNING Keep Away From Live Circuits Operating Personnel must at all times observe general safety precautions. -
Page 3: Safety Symbols
Safety Precautions Safety Symbols WARNING Warning notes call attention to a procedure, which if not correctly performed, could result in personal injury. CAUTION Caution notes 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 4: Warning Statements
The thermoswitch has a factory preset temperature adjustment screw. Do not adjust this screw. See page CAUTION Make sure the interlock is properly connected when overloaded to prevent damage to the load. See page CAUTION Use only Bird coolant, P/N 5-1070, to prevent damage to the load. See page... -
Page 5: 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 6 1 kW Termaline Coaxial Load Resistor Series 8251 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.
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Page 7: About This Manual
About This Manual About This Manual This instruction book covers the following models: 8251 8251N 8251D 8251D7-16 8251T-230 8251T-300 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 8: Table Of Contents
Table of Contents Safety Precautions ..............i Safety Symbols . - Page 9 Table of Contents Storage and Shipment ............... . . 12 Storing the Load Resistor .
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Page 10: Chapter 1 Introduction
Chapter 1 Introduction Bird 8251 Series Loads are portable, general purpose 50 ohm coaxial RF transmission line terminations. They are accurate, dependable, and low reflection, dissipating up to 1000 watts of RF power. See Figure 1 on page 2 frequency ranges. - Page 11 Introduction Figure 1 Outline Drawing Thermoswitch Model Connector Frequency Range Temperature 8251 Female LC DC – 2400 MHz 8251N Female N DC – 1000 MHz 1-5/8” EIA Swivel 470 – 860 MHz 8251D 8251D7-16 7/16 IEC 470 – 860 MHz 1-5/8”...
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Page 12: Chapter 2 Theory Of Operation
Theory of Operation Load Resistor Bird 8251 series 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 13: Chapter 3 Installation
If the shipping container is not damaged, unpack the unit. Save shipping materials for repackaging. 3. Inspect unit for visual signs of damage. Note: If there is damage, immediately notify the shipping carrier and Bird Electronic Corporation. Setup Note: Before first using the load, get a resistance baseline for future maintenance. Refer to "DC... -
Page 14: Installing Thermoswitch
Installing Thermoswitch Bird 8251T loads are identical to the 8251 except for a factory-installed interlock thermoswitch. It is normally closed, opening at either 230 or 300 °F (110 or 149 °C), depending on the model. The terminals are rated for 10A @ 120 Vac and 5A @ 240 Vac. -
Page 15: Using A "Qc" Connector Coupling
Installation Using a “QC” Connector Coupling Use a 50 ohm coaxial cable such as RG-218/U or -220/U (-17A or -19A), appropriate for the frequency and power level of operation. Note: Use a cable connector which will mate with the one on the load. Using a 13-30 Coupling Use 50 ohm coaxial cable such as RG-8A/U, RG-9U, RG-213/U, or equivalent with a male 13-30 plug. -
Page 16: Chapter 4 Operating Instructions
Normal Operation Bird 8251 series 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 17: Chapter 5 Maintenance
Chapter 5 Maintenance This chapter covers cleaning, inspection, troubleshooting, and specifications for the Bird 8251 series loads. Troubleshooting The table below contains troubleshooting information for problems which can occur during normal operation. This manual cannot list all malfunctions that may occur, or their corrective actions. If a problem is not listed or is not corrected by the listed actions, notify a qualified service center. -
Page 18: Inspection
Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. The potential for electric shock exists. CAUTION Use only Bird coolant, P/N 5-1070, to prevent damage to the load. 1. Remove the load resistor (Refer to “Load Resistor” on page 18). -
Page 19: Repair
RF Connector The Bird 8251 and 8251N have a special 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. To change the connector, proceed as follows: 1. -
Page 20: Load Resistor
1 kW Termaline Coaxial Load Resistor Series 8251 6. To reassemble, reverse these steps. Figure 6 Rear Seal WARNING The vent plug must be used at all times when the unit is operating or cooling. Failure to do so could result in an explosion or severe burns. Load Resistor 1. -
Page 21: Storage And Shipment
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 22: Specifications
1 kW Termaline Coaxial Load Resistor Series 8251 Specifications Frequency Range 8251 DC – 2400 MHz 8251T DC – 2000 MHz 8251N DC – 1000 MHz 8251D, 8251D7-16 470 – 860 MHz Power Rating 1000 Watts continuous duty Impedance, Nominal 50 ohms Operating Position Horizontal only –... -
Page 23: Replacement Parts
Maintenance Replacement Parts Description Part Number RF Load Resistor: 8251D 8892-015 8251D7-16 8890A050 All other models 8890A050 Resistor O-Ring 5-230 Clamping Band Assembly 2430-055 Plug Vent 2450-094 Shipping 2450-049 Thermoswitch Kit 149 °C (300 °F) 2450-129-1 110 °C (230 °F) 2450-129-2 Coolant, 0.75 gal (2.84 L) 5-1070-2... -
Page 24: 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 specifica- tions, 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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