BIRD 8890-400 Termaline Wattmeter (1997) WW 电路图.pdf

《BIRD 8890-400 Termaline Wattmeter (1997) WW 电路图.pdf》由会员分享，可在线阅读，更多相关《BIRD 8890-400 Termaline Wattmeter (1997) WW 电路图.pdf（43页珍藏版）》请在收音机爱好者资料库上搜索。

1、INSTRUCTION BOOK OPERATING INSTRUCTIONS TERMALINEWATTMETER SERIES 8890-400 Copyright 1997 by Bird Electronic Corporation Instruction Book Part Number 920-8890-400S Revision A. Termalineand Thrulineis a Registered Trademark of Bird Electronic Corporation Electronic Corporation Cleveland (Solon) Ohio

2、USA RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 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 appl

3、y to all phrases of operation and maintenance. Keep Away From Live Circuits Operating personnel must at all times observe normal safety regulations. Do not replace components or make adjustments to the inside of the test equip- ment with the high voltage supply turned on. To avoid casualties, always

4、 re- move power. Do Not Service Or Adjust Alone Under no circumstances should any personnel reach into an enclosure for the purpose of service or adjustments of equipment except in the presence of someone who is capable of rendering aid. Safety Earth Ground An uninterruptible earth safety ground mus

5、t be supplied from the main power source to test instruments. Grounding one conductor of a two conduc- tor power cable is not sufficient protection. Serious injury or death can occur if this grounding is not properly supplied. Shock Hazard Do not attempt to remove the RF transmission line while RF p

6、ower is pres- ent. Radiated RF power is a potential health hazard. Resuscitation Personnel working with or near high voltages should be familiar with modern methods of resuscitation. Safety Symbols WARNING Warning notes call attention to a procedure, which if not correctly performed, could result in

7、 personal injury. i RadioFans.CN 收音机爱 好者资料库 CAUTION Caution notes 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 particu

8、lar area. +Note: Calls attention to supplemental informa- tion Warning Statements The following safety warnings appear in the text where there is danger to op- erating and maintenance personnel and are repeated here for emphasis. WARNING Before placing the unit into operation, remove the shipping pl

9、ug at the top of radiator, near front, substitute with the specially shielded breather plug. Use a 3/4 inch flat wrench for this purpose - do not lose the O-Ring Seal. This vent hole must remain open at all times when the unit is in operation or cooling. Failure to do this could result in damage to

10、the equipment and endanger the operators safety. The use of the vent plug also protects the filler opening against intrusion of foreign material while allowing unobstructed venting of the tank. The shipping plug (with O-Ring seal) should be put back in place whenever the unit is to be transported. B

11、e sure to check this plug. 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. Caution Statement The following equipment caution appears in the text whenever the equipment is in danger of damage

12、and is repeated here for emphasis. CAUTION This unit is factory filled with approximately 2.9 gallons (11 liter) of a specially selected dielectric fluid, P/N 5-1070-3. No other coolant should be used. ii Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURE

13、R MAY IMPAIR THE INSTRUMENTS SAFETY PROTECTION. USO EL USO DE ESTE INSTRUMENTO DE MANERA NO ES- PECIFICADA POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIN DE SEGURIDAD DEL INSTRU- MENTO. BENUTZUNG WIRD DAS GERT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERTESICHERHEIT BEEINTRC

14、HTIGT WERDEN. UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI NEST PAS EXPLICITEMENT PRVUE PAR LE FABRI- CANT PEUT ENDOMMAGER LE DISPOSITIF DE PRO- TECTION DE LINSTRUMENT. IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZ- ZATO IN MODO DIVERSO DA COME SPECIFICATO DAL PRODUTTORELAPROZIONEDISICUREZZ

15、A POTREBBE VENIRNE COMPROMESSA. SERVICE SERVICING INSTRUCTIONS ARE FOR USE BY SERV- ICE -TRAINED PERSONNEL ONLY. TO AVOID DAN- GEROUS 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 CA- PAC

16、ITADO. PARA EVITAR EL PELIGRO DE DESCAR- GAS ELCTRICAS, NO REALICE NINGN SERVICIO A MENOS QUE EST CAPACITADO PARA HACERIO. iii WARTUNG ANWEISUNGEN FR DIE WARTUNG DES GERTES GELTEN NUR FR GESCHULTES FACHPERSONAL. ZUR VERMEIDUNG GEFHRLICHE, ELEKTRISCHE SCHOCKS,SINDWARTUNGSARBEITEN AUSSCHLIE_LICH VON Q

17、UALIFIZIERTEM SERV- ICEPERSONAL DURCHZUFHREN. ENTRENTIEN LEMPLOI DES INSTRUCTIONS DENTRETIEN DOIT TRE RSERV AU PERSONNEL FORM AUX OPRA- TIONS DENTRETIEN. POUR PRVENIR UN CHOC LECTRIQUE DANGEREUX, NE PAS EFFECTUER DENTRETIEN SI LON NA PAS T QUALIFI POUR CE FAIRE. ASSISTENZA TECNICA LE ISTRUZIONI RELA

18、TIVE ALLASSISTENZA SONO PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OP- PORTUNAMENTE ADDESTRATO. PER EVITARE PERI- COLOSE SCOSSE ELETTRICHE NON EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE QUALIFICATI A FARLA. CONNECT INTERLOCK TO TRANSMITTER BEFORE OPERATING. BRANCHER LE VERROUILLAGE LMETTEUR AVANT EMPLO

19、I. CONECTE EL INTERBLOQUEO AL TRANSMISOR AN- TES DE LA OPERACION. VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER ANSCHLIESSEN. PRIMA DI METTERE IN FUNZIONE LAPPARECCHIO, COLLEGARE IL DISPOSITIVO DI BLOCCO AL TRAS- METTITORE. iv About This Manual This instruction book covers the models: 8890-400A8897-400A

20、 8891-415B8897-415B 8891-420B8897-420B 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. The remainder of the instruction book is divided into S

21、ections and Chapters. At the beginning of each chapter a general overview will be given, describing the contents of that chapter. Operation First time operators should read Chapter 1 - Introduction, Chapter 2 - Theory of Operation, and Chapter 3 - Installation, to get an overview of equipment capabi

22、lities and how to install it. An experienced operator can refer to Chap- ter 4 - Operating Instructions. All instructions necessary to operate the equipment are contained in this section. Maintenance All personnel should be familiar with preventive maintenance found in Chap- ter 5 - Maintenance. If

23、failure should occur, the troubleshooting section will aid in isolating and repairing the failure. Changes To The Manual We have made every effort to ensure this manual is accurate. If you should discover any errors, or if you have suggestions for improving this manual, please send your comments to

24、our factory. This manual may be periodically updated. When inquiring about updates to this manual, refer to the part number and revision level on the title page. v Table of Contents Safety Precautions .i Safety Symbols.i Warning Statements .ii Caution Statements .ii Safety Statements.iii About This

25、Manual.v Introduction.1 Purpose and Function. .1 Items Supplied. .1 Description.1 Accessory Items.2 Items Required. .2 Theory of Operation. .5 Element Socket. .5 Coupling Circuit.6 Dielectric Coolant and Seal. .7 Cooling.7 Installation. .9 Power and Utility Requirements.9 Environmental Requirements.

26、 .9 Tools Required. .9 Mounting.9 Coupling Kits.9 vi RF Connection.10 Thermoswitch. .12 Meter Placement.15 Blower Assembly.15 Operating Instructions. .17 Use and Function of Controls.17 Initial Adjustments.17 Start-Up. .18 Normal Operation. .18 Operation Under Abnormal Conditions.18 Shutdown. .18 Em

27、ergency Shutdown.19 Maintenance. .21 Customer Service. .21 Sales / Repair Facilities. .21 Sales Facilities.21 Cleaning. .22 Outside Surfaces. .22 Inspection.22 Preventive Maintenance.23 Contact Adjustment. .23 Repairs.24 RF Load Resistor Test. .24 Assembly.25 Coolant.26 RF Input Connector. .26 vii S

28、hipment.27 Storage.28 Troubleshooting. .29 Replacement Parts List.30 viii Chapter 1 Introduction This instruction book is intended for use by operators of the Model 8890-400 Termaline Wattmeter. This chapter contains introductory information including product specifications; items supplied; and acce

29、ssory items available. Purpose and Function The Series 8890-400 Termaline Wattmeters are low reflec- tion and nonradiating terminations for coaxial transmission lines. They aid in the tuning and troubleshooting of trans- mission equipment whose characteristics fall within the per- formance range of

30、the elements used. These performance specifications are described in the next paragraph and sum- marized in the Specifications. Items Supplied sCoolant Pre-filled unit sShipping Plug sVent Relief Valve sCoupler Pre-Mounted sInstruction Manual DescriptionThe Series 8890-400 Wattmeters will safely and

31、 continu- ously dissipate up to 5000 watts of RF power when blower equipped. It is possible to subject these loads to moderately higher power for limited periods of time. In this case it is recommended that an 8890-400 be equipped with an over- temperature thermoswitch, Bird P/N 8890-008, which shou

32、ld be interlocked with the source of RF energy. In this way, the load will be automatically protected from the con- sequences of over heating. The intended frequency range is 2 to 1000 MHz within which the loads will reflect very little power back to the source. The actual VSWR, “Voltage Standing Wa

33、ve Ratio”, will not exceed 1.15 to 1.00 from dc to 1 Ghz. 1 Accessory Items Thermoswitch P/N 8890-008 An optional item for Models 8891-400A and 8897-400A. Blower Assembly P/N BA-310 An optional item for Mod- els 8891-400A and 8897-400A. All other wattmeters are shipped with the blowers already mount

34、ed. Items Required Mating Connector Necessary on the transmission line to which the load is to be connected. AC Socket If the Model BA-310 Blower Assembly Kit is ordered, provide an ac socket convenient to the equipment. 2 Bird Model 8890-400 Series Termaline Wattmeter Specifications Impedance50 ohm

35、s VSWR1.15 - 1.00 dc to 1000 MHz Connectors Model 8891-400A, 8891-420B Model 8897-400A 3-1/8” EIA flanged 3-1/8” unflanged (Flush Center Conductor) Power Rating* Models 8891-400A, 8897-400A All other models 2500 W continuous duty 5000 W continuous duty Frequency Range*2 to 1000 MHz Accuracy 8% of fu

36、ll scale Ambient Temperature Storage Operating +10C to +40C (+50F to 104F) +25C 5C (77F 9F) Cooling MethodLiquid dielectric and convection currents* Overall Dimensions17-3/16” H x 7-1/8” W (437 x 181 mm) Length Flanged Units Unflanged Units 25-1/8” (638 mm) 24-5/32” (613.6 mm) Meter Dimensions4-11/6

37、4”L x 5-9/16”W x 6-1/2”H (106 x 141 x 165 mm) Meter Weight5 lb (2.27 kg) Finish Load and Meter Housing RF Section Grey Powder Coat Bright Silver Plate *Actual frequency and power ratings are determined by the element used. Power Rating with blower assembly installed: Blower running - 5000 W Blower n

38、ot running - 1250 W *Assisted by forced draft when blowing assembly is installed and running. 3 Introduction 4 Bird Model 8890-400 Series Termaline Wattmeter 17-3/16 3/32 (437 2mm) 2-61/64 1/32 (75 1mm) INTERLOCK THERMOSWITCH (OPTIONAL) 20-23/32 3/32 (526 2mm) MTG. HOLE CENTERS 21-5/8 3/32 (549 2mm)

39、 21-45/64 3/32 (551 2mm) FILLER AND VENT VALVE Dependant on QC Connector Used CONTROL THERMOSWITCH (OPTIONAL) 3/8 (10mm)(4) ELONGATED MTG. HOLES 4-1/2 5-1/2 (114mm) (140mm) MTG. HOLE CENTERS Figure 1 Outline Drawing Chapter 2 Theory of Operation The Series 8890-400 equipment consists essentially of

40、a film-on ceramic resistor immersed in a dielectric coolant. The resistor, which is individually selected for its accuracy is enclosed in an exponentially tapered housing, providing a reduction in surge impedance directly proportional to the distance along the resistor. When the resistor unit is im-

41、 mersed in the dielectric liquid, the characteristic impedance will be 50 ohms at the connector end and graduate down from there to zero ohms at the rear, where the resistor joins the housing to form the return conductor of the coaxial cir- cuit. This produces a uniform, practically reflectionless l

42、ine termination over the stated frequencies of the load resistor. Element Socket An accurately positioned socket for inserting a radio fre- quency coupling device, called a Thruline Plug-In Element, is mounted on the outer conductor. The socket is precision bored to hold the rotatable element in its

43、 calibrated posi- tion, with a spring-loaded clasp to keep the element firmly seated. The machined step on the top face of the socket en- gages a stop-pin on the element. Rotary movement of the element is thereby restricted to 180 and is stopped on the axial center line. The measuring socket has a h

44、ole bored through the wall through which an insulated phosphor bronze contact finger projects. The plug-in element has terminals on diametrically opposite sides of its body, so that pick-up can be made from either side. Refer to figure 2. A small silvered button tip can contact the element only in t

45、he precise forward and re- flected measuring position (against the end stops.) A spe- cially designed jack mounted on the side of the socket mates with the plug on the dc cable furnished with the read-out meter. The dc jack assembly has a built-in filter capacitor shunted across the meter circuit. T

46、his more fully protects meter readings against the adverse effects of any stray RF energy generated in the plug-in element. 5 Coupling Circuit The coupling circuit which samples the travelling waves is in the plug-in element. Energy will be produced in the cou- pling circuit of the element by both mutual inductance and capacitance from the travellin