INSTRUCTION BOOK OPERATING INSTRUCTIONS TERMLINE® LOAD RESISTOR MODELS 8141 & 8141-010 Electronic Corporation Cleveland (Solon) Ohio USA © Copyright 1998 by Bird Electronic Corporation Instruction Book Part Number 920-8141 Rev.
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. Keep Away From Live Circuits Operating personnel must at all times observe general safety precautions. Do not replace components inside equipment with the high voltage supply turned on. To avoid casualties, always remove power.
Safety Symbols WARNING Warning notes call attention to a procedure, which if not performed correctly, could result in personal injury. CAUTION Caution notes call attention to procedure, which if not performed correctly, could result in damage to the equipment. This symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area. + NOTE: Calls attention to supplemental information.
Caution Statements The following equipment cautions appear in the text whenever the equipment is in danger of damage and are repeated here for emphasis. CAUTION Do not operate this equipment over the rated 250 watts continuously. Damage to the resistive element will result. Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY PROTECTION.
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 E XC L USIV O DE L P E R SON A L DE SE R V IC IO CAPACITADO. PARA EVITAR EL PELIGRO DE DESCARGAS ELCTRICAS, NO REALICE NING¤N SERVICIO A MENOS QUE EST CAPACITADO PARA HACERIO. WARTUNG ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR FÜR GESCHULTES FACHPERSONAL.
About This Manual This instruction book covers the models 8141 and 8141-010 Termaline Load Resistor. This instruction book is arranged so that essential information on safety is contained in the front of the book. Reading the Safety Precautions Section before operating the equipment is strongly advised. The remainder of this Instruction Book is divided into Chapters and Sections. At the beginning of each chapter, a general overview describes the contents of that chapter.
Table Of Contents Safety Precautions . . . . . . . . . . . . . . . . . . . . . . i Safety Symbols . . . . . . . . . . . . . . . . . . . . . . ii Warning Statements . . . . . . . . . . . . . . . . . . . . ii Caution Statements . . . . . . . . . . . . . . . . . . . . iii Safety Statements. . . . . . . . . . . . . . . . . . . . . iii About This Manual . . . . . . . . . . . . . . . . . . . . v Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 1 General . . . . . . . . . . . . . . . . . . . . . . .
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . 7 Emergency Shutdown . . . . . . . . . . . . . . . . . . . 8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 9 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Outside Surface . . . . . . . . . . . . . . . . . . . . . . 9 Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Preventive Maintenance. . . . . . . . . . . . . . . . . . . .
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Chapter 1 Introduction General This instruction book is intended for use by operators of the Models 8141 and 8141-010 Termaline Load Resistor. This chapter contains introductory information including product specifications; items supplied; and accessory items. Purpose And The Models 8141 and 8141-010 Termaline Load Resistor are Function portable, general purpose 50 ohm coaxial transmission line terminations. They are self-contained units requiring no outside power source or additional equipment.
Bird Model 8141 Termaline Load Resistor Power and Other than the RF power input the Models 8141 and 8141Utility 010 has no need for an external source of power or utility Requirements services. Environmental The loads should be operated in as clean and vibration free Requirements an environment as possible. The ambient temperature range should remain within -40°C to +45°C (-40°F to +113°F) for proper operation.
Chapter 2 Theory Of Operation General The Models 8141 and 8141-010 Termaline Load Resistor consists essentially of a cylindrical film type resistor immersed in a dielectric coolant. The resistor, individually selected for its accuracy, is enclosed in a special tapered housing which provides a linear reduction in surge impedance directly proportional to the distance along the resistor. This produces the uniform, practically reflectionless line termination over the stated frequencies of the load.
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Chapter 3 Installation General Position the Model 8141 and 8141-010 Termaline Load Re- sistor to provide at least six inches of unobstructed space around and above the unit. Place the load to permit the shortest possible cable length between the unit and the transmitting equipment. Operate the load in a horizontal position only, with the handle on top. The load may be free-standing or fastened to any convenient flat surface.
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Chapter 4 Operating Instructions Start-up Connect the Models 8141 and 8141-010 Termaline Load Re- sistor to the transmitting equipment under test with 50 ohm coaxial cable such as RG-213/U or equal, equipped with a Male N type plug (UG-21E/U or equal) which mates with the RF input connector of the load. After the transmitter has been connected to the load, proceed according to the transmitter manufacturer’s instruction.
Bird Model 8141 Termaline Load Resistor Emergency Shutdown WARNING Never attempt to disconnect RF equipment from the transmission line while RF power is being applied. Leaking RF energy is a potential health hazard. Turn off the equipment by removing power from the RF generator.
Chapter 5 Maintenance Troubleshooting For corrections requiring repair or replacement of components, refer to the appropriate section for your specific model.
Bird Model 8141 Termaline Load Resistor Inspection With the rugged and simple construction of loads, periodic inspection will be necessary at only about six month intervals. Inspection should include the items listed below: a. Cleanliness - Keep the housing and connector free of grime. b. Oil Leakage - Check for coolant oil seepage from the radiator tank, and particularly at the front and rear near the under side of the clamping band. See Troubleshooting Chart if leakage is observed.
Maintenance with an accuracy of one percent or better at 50 ohms for this purpose. If the load is used frequently, daily to weekly, it would be wise to check the resistance on a monthly schedule. If however, the load is used more infrequently you may want to set up a six month to yearly schedule accordingly. If there is no change or even a slight change in dc resistance there is no cause for alarm, however, if there is a drastic change greater than two ohms, this could be an indication of a failing load.
Bird Model 8141 Termaline Load Resistor c. Remove the diaphragm cover and lift the diaphragm from the back end of the radiator tank. The diaphragm should be soft and pliable. If it is hard or shows signs of surface cracks, replace it. (Bird P/N 2430-015). d. The coolant level should be about one inch below top of the cylinder. If oil appears contaminated, replace. Use only the specified coolant, Bird P/N 51070. RF Load To replace the load resistor assembly proceed as follows: Resistor Assembly a.
Maintenance b. Press the cup-like swelling in the center of the diaphragm down into the tank to remove the trapped air bubble. To allow the air to escape, pry the diaphragm away from the edge of the tank. Through the same opening add more oil, if necessary, until the oil level is flush with the top of the tank. c. Replace the diaphragm cover and the clamping band. Tighten the clamping screw.
Bird Model 8141 Termaline Load Resistor Sales Offices For the location of the sales office nearest you, give us a call or visit our Web site at http://www.bird-electronic.com Storage No special preparation for storage is required other than to cover the equipment to keep it free of dust and dirt accumulations. Storage in a dry, dust and vibration free environment is recommended. The storage temperature should preferably remain within the working temperature range of -40°C to +45°C (-40°F to +113°F).
DECLARATION OF CONFORMITY Manufacturer: Bird Electronic Corporation 30303 Aurora Road Cleveland, Ohio 44139-2794 Product: TERMALINE LOAD RESISTOR Models: 8140-010 8141 The undersigned hereby declares, on behalf of Bird Electronic Corporation of Cleveland, Ohio, that the above-referenced product, to which this declaration relates, is in conformity with the provisions of the following standards; 1. European Standard EN 61010-1:1993 - Safety, Group II.
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.
