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- Page 1 INSTRUCTION BOOK OPERATING INSTRUCTIONS ® TERMALINE COAXIAL LOAD RESISTOR MODEL 8135 Electronic Corporation Cleveland (Solon) Ohio USA ©Copyright 1996 by Bird Electronic Corporation Instruction Book Part Number 920-8135 Rev. B ® Termaline is a Registered Trademark of Bird Electronic Corporation...
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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 throughly understood and apply to all phases of operation and maintenance. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must at all times observe normal safety regulations. - Page 4 RESUSCITATION Personnel working with or near high voltages should be familiar with modern methods of resuscitation. SAFETY SYMBOLS WARNING Warning: Warning notes call attention to a procedure, which if not correctly performed could result in personal injury. CAUTION Caution: Caution notes call attention to a procedure, which if not correctly performed could result in damage to the instrument.
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Page 5: About This Manual
About This Manual This instruction book covers the models 8135 and 8135A Termaline Coaxial 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 be- fore operating the equipment is strongly advised. -
Page 6: Table Of Contents
Table Of Contents Safety Precautions....i Warning Statements ..... ii Caution Statements . - Page 7 Start Up......7 Normal Operation..... . . 7 Operation Under Abnormal Conditions .
- Page 8 Bird Model 8135 Termaline Coaxial Load Resistor Replacement Parts List ....13 Difference Data Sheet ....15 VSWR Difference .
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Page 9: Introduction
Chapter 1 Introduction The Bird Model 8135 TERMALINE Load Resistor is a por- Purpose and Function table, general purpose 50 ohm coaxial transmission line ter- mination. It is a self-contained unit requiring no outside power source or additional equipment. This coaxial load re-... - Page 10 Bird Model 8135 Termaline Coaxial Load Resistor SPECIFICATIONS Impedance 50 ohms nominal VSWR 1.1:1.0 maximum dc-1000 MHz 1.2:1.0 maximum 1000-2500 MHz 1.3:1.0 maximum 2500-4000 MHz Connectors Female N “QC” type (normally supplied) Power Range 150 W continuous Frequency Range DC-4000 MHz Dimensions 8-13/16"L x 4"W x 6-7/16"H...
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Page 11: Theory Of Operation
Chapter 2 Theory of Operation The Model 8135 TERMALINE Load consists essentially of a General cylindrical film type resistor immersed in dielectric coolant. The resistor, individually selected for its accuracy, is en- closed in a special tapered housing which provides a linear reduction in surge impedance directly proportional to the distance along the load resistor. - Page 12 Bird Model 8135 Termaline Coaxial Load Resistor...
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Page 13: Installation
Chapter 3 Installation Free air circulation around the Model 8135 TERMALINE Location Load is essential. Keep the load in the clear, and do not place it near heated surfaces. The Model 8135 should have at least a 6 inch clearance on all sides. Keep the space above the unit unobstructed for good air circulation. - Page 14 Bird Model 8135 Termaline Coaxial Load Resistor...
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Page 15: Operating Instructions
Chapter 4 Operating Instructions The Model 8135 is a passive electronic device and therefore Use and Function of has no controls to operate. Controls No adjustments or setting are required. Initial Adjustment Connect the Model 8135 TERMALINE Load to the trans- Start Up mitting equipment under test with 50 ohm coaxial cable such as RG213/U or equal, and a Male N type plug... -
Page 16: Emergency Shutdown
Bird Model 8135 Termaline Coaxial Load Resistor Power must be shut off from the RF source as in the above Emergency Shutdown procedure. WARNING Never attempt to disconnect the equipment from the transmission line while RF power is being applied. -
Page 17: Maintenance
Chapter 5 Maintenance Troubleshooting For corrections requiring repair or replacement of compo- nents, refer to the appropriate section for your specific model. Table 1 PROBLEM POSSIBLE REMEDY Troubleshootin CAUSE Lakage of cool- Clamping bands Tighten slightly ant oil around not tight with screwdriver clamping band or Faulty O-Ring... -
Page 18: Cleaning
Bird Model 8135 Termaline Coaxial Load Resistor Cleaning The principle maintenance required by the operator will be Radiator the cleaning of the radiator fins. Keep the radiator of the Model 8135 Termaline Load clean and free of dust. Wipe away the accumulated dust and grime with a soft clean cloth. -
Page 19: Disassembly
Maintenance Disassembly There are no special techniques required for the repair or replacement of components in the Model 8135 TERMALINE Load. A screwdriver is the only tool needed. The paragraphs below outline component removal. The input connector is a patented “Quick-Change” design RF Input Connector which permits easy interchange with the use of only a... -
Page 20: Assembly
Bird Model 8135 Termaline Coaxial Load Resistor DO NOT reuse the O-Ring if it is no longer pli- able or shows signs of surface cracks. ASSEMBLY Reverse the procedure in the RF Input Connector Replace- RF Input Connector ment paragraph to install a new connector. Be sure that the... -
Page 21: Storage
Maintenance No special preparations for storage are necessary other than Storage covering the load to keep it dust free. Store in a dry and dust-free environment. Keeping the ambient temperature within the -40C to +45C (-40F to +113F) working range is preferable. - Page 22 Bird Model 8135 Termaline Coaxial Load Resistor...
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Page 23: Difference Data Sheet
Chapter 6 Difference Data Sheet MODEL 8135A TERMALINE LOAD RESISTOR The Model 8135A is identical to the Model 8135 electrically and physically. It has, however, a special RF section which provides special peak power handling capabilities. It will handle up to 35 kW peak power with a pulse width of one microsecond. - Page 24 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 spec- ified, from date of shipment and to conform to applicable specifications, draw- ings, blueprints and/or samples.
- Page 25 8135 8135A 8135-075 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; European Standard EN 61010-1:1993 - Safety, Group II.
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