bk_model_650_service_information 电路图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 ENJOY YOUR BOOKS PLEASE VISIT OUR STORE FOR EVEN MORE GREAT STUFF! WWW.EVERYTHING4LESSSTORE.COM COPYRIGHT NOTICE ALL MATERIALS INCLUDING CD/DVD AND PDF FILES ARE COPYRIGHTED WWW.EVERYTHING4LESSSTORE.COM VON WALTHOUR PRODUCTIONS AND MAY NOT BE REPRODUCED, COPIED OR RESOLD UNDE

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3、URN FOR FULL REFUND FROM AN UNAUTHORIZED SELLER. THANKS AGAIN AND PLEASE TAKE THE TIME TO VISIT OUR STORE. ATTENTION! EVERYTHING ON SALE NOW! RadioFans.CN 收音机爱 好者资料库 B&KMODEL TUBETESTER OFFICIALINSTRUCTIONS ACircuit TheModel650isa dynamicmutual conductance tubetester,built intwochassis.Thefirstchass

4、is consistsof the main panel which contains ofthe necessary voitages requiredtotestthe tubes and all33test sockets. voltages required for the auxiliary socket panel appearonthe contact conneetor locatedonthe bridge panel.The terminals of thiscontactaein thefollowingmanner. themain panel sittingupsid

5、e down and the meter closest to you,the lower-hand contact wouldbemarked1and wouldread-#1 readings from bottom toTheleftrowofcontacts startwith#11in the lower left-hand corner and read from bottomtotop,11to# Thesecorrespond to thenumbersontheschematicdiagram with this serviceinformation. Theschemati

6、cdiagramallof the necessary voltagestotroubleshoot this instrument.Allvoltages measured areopened circuit voltages, measuredwith115VAConthe primary, andmeasurements been madewithaohmpervoltorequivalenttochassis ground. With test switch in test#position.unlessnoted. Thetubetesterisbasicallyabalanced

7、bridge circuit, consistingthe winding of transformerbetween brown and red-green, and the between red-yellow andred,andresistorsR-5and,matched150 ohm resistors, and thetwohalves of thetype83. The indicating meterconnected with a shunting potentiometer whichis thesensitivitycontrol across thetwoohm re

8、sistors. Theplateofthetubeundertest connects to terminal#10or#11in test1 and2respectivelywhichi sthecathode83in thetest voltageisrequired,that isobtained from pin9whichisa power.Thisvoltageisvolts. Inthe test position, thecathodeisground and theheater voltagesarebetweenterminals34,andareselectedbyth

9、e heater selector switch.Thebiasorthe tube undertestisobtained from terminalsor8,dependinguponthebias classificationofthe tube. Injected inseriesthebiasisa smallsignalin phase with theupperwindingthewindingtoprovide uswith the signal necessary to make themeasurementin conductance. I RadioFans.CN 收音机

10、爱 好者资料库 MODEL650 CONTINUEDFROMPAGE1 Acloser examinationofthe bias networkand signalvoltage network is required.The negativevoltageisobtainedthroughselenium rectifier is,inturn, connectedto thesecondaryofthe power The outputof the selenium rectifier goes through a bleeder resistor network,consistingo

11、fR-12,R-21,R-22,R-23. R-23in turn returns to the output point of a voltage sensitivebridge consistingof two#55bulbs andtwo16ohmresistors. I This bridge inturngoestoR-3,a voltagedroppingpotentiometer which isinserieswith awindingoftheheater transformer. Theobtainedthrough this bridge circuit from the

12、 transformer is inserieswith thevoltageonthe bias string. Itisthis signalvoltage which appearsonthe biasstringto excitethegrid and provideuswith the basisofmeasurement. 2 MODEL650 SERVICE purpose ofthevoltagesensitivebridge istouswith the automatic linevoltagecompensationfeature that our instrument

13、Itoperates in the followingmanner. Thevoltagesensitivebridgehasaninversecurrentcharacteristic. When the linevoltagedrops the resistanceof the bridge circuit decreases causingan increase in signalvoltage. If we did not employ thisvoltage sensitivewe had an increaseinlinevoltage, this wouldresultin an

14、increase in plate voltagetothe tube under test,anincrease in heater voltageand an increasein signal voltage. Thiswould cause the test meterontheto read higher thanit should. However, because of thevoltagesensitivebridge and the manner whichitisoperated,foranincreaseinlinevoltage, thevoltagesensitive

15、 bridge bucks this increase by causingadecreasethevoltage appliedto the tube undertest. Thisdecrease of signalvoltageoffsetsthe increaseofother tube voltagesandcausesthe insturment meter toreadapproximatelythe same asit did if the tube were tested at115volts. regulation wilt be maintained betweenl i

16、 m i t s-125voltsofline voltage, and will causethe insturment to benomorethan about5%off in its readingorthiswideof linevoltage. The design ofsocketisbased on thethatnumbers of tubeshavingthesamebasingandoperatingconditionsbe lumped and tested inonesocket. Forexample, socket9which tests tubesof the7

17、pin miniature variety,in approximatelythesameregionofgrid bias. This is about2.5volts. Thissameapproach was used in grouping foraitothersocketspanel. With the auxiliarysocketpanel turned upsidedowa and the terminal strip locatedon the furtherestaway, theseterminalstripsare numbered from Thesenumbers

18、 correspondto the inter-chassisplug number which weredescribed with referencetothe bridge panel. Page3 I B&RMODEL CALIBRATIONPROCEDURE The calibration ofModel650insturmentisquitesimpleand can be explainedonthe accompanying procedure steps. 1.SIGNAL Thefirststepisto take an AC vacuum tubevoltmeter, a

19、nd with exactly 115voltsofClinevoltage, adjust the ACsignalatterminal6OB bridge panel to read exactly1.45volts This adjustmentisby adjustingthe signallocated directly beneath socket60. Thiscontrolcanbe reached with a screwdriverthe keyway of this socket. 2. Witha20.000ohm per voltvoltmeter, connect

20、from pin#6to ground adjust thebiascontrolwhich isR-4togetareading ofvolts. With a voltageof2.5volts at pin6,pin7should read3.5voltsand pin 3should read approximatelyvolts. Thesevoltagesare predetermined by the valuesofthe bias whitchare5%. theevent that the othertwovoltages do notin, you can anticip

21、ate oneofthe resistors in the bias stringashavingachangein value. isasmallcontrol located next to the signalpot. 3.BALANCE Thenext procedureistotestthefor balance, and this is by connectingaohm,10watt wire wound resistor from terminal#10of theplug to ground, and set the sensitivitycontrolto Ifthe in

22、strumentisout of balance, the meter willdeflected either upward or downwards, dependinguponthe direction of the unbalance. instrumentsinforservice mustbechecked in this manner. Ifthe instrumentisoutofyoufind located underneath panel another small sensitivitycontrolto the bracket directly under the f

23、ront panel sensitivitycontrol. Adjustment of this controlwill enebleyou to restorethetoitszero reading. MODEL650 CALIBRATION PROCEDURE CONTINUEDFROMPAGE4 4.OPGASGRID Sincethe grid emissiontest effectivelymeasures extremely high resistancesthe sensitivityofthis test will veryw i t htemperature and hu

24、midity. Lossofsenstivity will occur under low temperature, low humidity conditionswhile an increasesensitivityoccur under high temperature. Absolutesensitivity can be obtained by periodicallyadjusting the gas sensitivitycontrol withnotube in thesocket,that themeter readingjust fallstozero. By checki

25、ngthisadjustment periodically, this threshold point canbe maintained. For nominal sensitivityof approximatelymegohm,adjust as: Connecta20megohmresistorbetween pin1of socket#9and Withtestswitch inshortsandgasposition, adjust P-43for a reading of onthetestmeter. P43control can bewithascrewdriver throu

26、gh the keyway of Formore sensitivegastest, adjust for higher reading. Forlesssensitivegastest, adjustforlowed reading. 5.THESTEPTHE CALIBRATION Istothe signalcontrol R-3that calibrated tubes read correctly. Page5 MODEL650 VOLTAGECHART readingstakenwitha1%V.O.M.with chassisasreference point. Witha115

27、volt AC inputand test switchintestposition. # 1=o. 2 3=Heater. 4=Heater. 5=0voltsa1.45voltsAC can be measuredwithanAC meter. 7=-8.3voltsV.T.V.M.orV.O.M.with high capacitycapacitor inseries. 8= 9= 10=205volts DC. 11=205voltsP o s .2only. 12=35volts AC. 13=35volts AC,Pos.2only. 14=35volts AC,Pos.2only

28、. 15=35AC,P o s .3only. 16=200volts AC. 17=N.C. o. 19=ACLine. 20=AC Line. 6-2.5DC-. Page6 MODEL650 SERVICE BULLETIN Additional information that you should checkyour650forisas : Number1 Changingthe#49pilot litetoa44bulb has been doneinproduction at serial#5163. Units below this serial#should be check

29、ed for this change. The reasonforthechangeisto preventapossible burn outof the#49 pilotusedasafuse. Ifthe#49bulb isusedchangeittoa44bulb. directshortis encountered, this fusewillglowvery brightly. Thisfusewillglowveryifatube isinto the socket.somecasesthe old fuse49)burnt out when the plate cap lead

30、accidentallythefrontpanel while the tester wasintheGM position. Thiswillnolongerwith the44bulb change. 2 Addresistor this hasbeendoneinproduction atapproximately serial#4700and up. Checktoseeif this changehasbin made. R-35isa1200ohmwatt10%carbon resistor in serieswith high voltage terminal#16onmain

31、panel. This isto preventoff scaledeflectionofthemeterwhen checkinghigh voltage rectifiers. Iftheunit beingserviced dosenot have this resistoritshould be addedat this Number3 ChangeR-20resistor this has been doneinproduction atapproximately serial4700and above.a82ohm1resistor. ThenewR-20mustbea120ohm

32、1watt5%. T h i si sto preventoffof the meterwhenlow voltage rectifiers. Number4 ChangeR-18resistor this has been donein production at approximately serial#and above. Oldisa270Kohmwatt resistor. The newR-18mustbea470Kohm1watt5%resistor. Thischangethesensitivity oftheshortscheck. Number5 Changeandresi

33、stor thishasbeen done in production at #and above. OldR-10isa1 resistor the newmust be aohm1watt5%resistoris aohmwatt resistor,Thenewmustbea27Kohmwatt 5%resistor. Thisincreasesstability of the grid emission check. Page7 . At KTube festerCircuitList DESCRIPTION Selenium Rectifier SeleniumRectifier M3

34、Off-On-LifeTestSwitch M4HeaterSwitch M5TestSwitch M6#44Mazda Lamp (Fuse). M7Mazda Lamp. M8 NE51 Neon Lamp (Shorts). NE51 Neon Lamp(HeaterContinuity) Mazda Lamp (Pilot Light). M12 Meter v2 c2 c3 c 4 R3 R4 R5 R6 R8 Transformer Tube 250V Electrolytic Capacitor. 250V Electrolytic Capacitor 250V Electrol

35、ytic Capacitor Electrolytic Capacitor Tubular Capacitor. .600VTubular Capacitor. .500V Disc Ceramic Capacitor. Control Control Control Control 5W5%Resistor 5%Resistor. 5W5%Resistor. 5W 5% Resistor 180K10% Resistor 5% Resistor. 27K5% Resistor 5% Resistor. R1347OK10% Resistor. R145W 5% Resistor R15 5.

36、610%Resistor R1610%Resistor. 56K10%Resistor 470K10%Resistor E19 1800525% Resistor. 5% Resistor. R215% Glass Resistor.,. . R227W 5% Glass Resistor. R237W 5% Glass Resistor. R2410% Resistor R2510% Resistor. R26 3302210% Resistor. R2710% Resistor. PARTNo. .E-65B E-65B .5-10 . .5-2 . . L.l . . .ME-1 .TP

37、-1 . .V-83 .CL-20-250 CL-20-250 .CL-20-250 .CL-250-6 .CP-Al-200-20 .CP-A005-600-20 .CC-A01-500-20 .P-4 .P . 2 . P.3 .RW-151-D-5 D.5 .RW-160-D-5 .A.10 RC-124-B-5 .RC-273-A-5 RC-103-C-5 .RC-474-A-10 RW-352-D-5 A.10 A.10 RC-563-A-10 RC-4S4-A-10 RC-182-B-5 RC-121-B-5 .RG.122.7.5. . A.10 C.10 .C.10 ,.RC-

38、103-A-10 .RW-160-D-5 11 DESCRIPTION . . . . . . . . . . PARTNo .10%Resistor. 10%Resistor. R3010% Resistor. R3110%Resistor.RC-103-A-10 R32 330012Resistor. R332200122W10%Resistor.RC-222-C-10 R342200122W10%Resistor.RC-222-C-10 R35 12001210% Resistor.RC-122-B-10 R36Meg.10%Resistor.RC-106-A-10 67Pin Mini

39、ature Tube Sockets. . . . . . . . . . 219PinNovalTube Sockets(Test). . . . . . . . . . . . . . 6.Octal Tube Sockets(Test). . . . .G8P 2PinJacks. 120Contact Connector Socket 1 . BKMODEL650TUBE TESTERTEST2PARTS LIST 500VDisc Ceramic Capacitor.CC-470-500-20 500VDisc Ceramic Capacitor. R35Resistor. R36

40、220K5%.RC-224-A-10 R3710%R.RC-182-B-10 . . . . . 7pinMiniature Tube.Pin Straightener. 9 PinTubePinStraightener. M13 Transistor Gain PinMiniature Tube Sockets (Test). . . . . . . . . .G-7PF 129PinNovalTubeSockets(Test). . . . . . . . . . . . . . Loctal Tube Sockets(Test).G-8L ,laOctal Tube Sockets(Te

41、st).G-8P 2Transistor Sockets (Test).GT-3 1Line Cord and Plug.w-5 3Black Pin Jacks. . . . . . . . . .J3 Red Pin Jack. Contact Connector Socket . MISCELLANEOUSPARTSLISTFORMODELNo.650 Line Cord. Inter-Chassis Connecting Cable. Case. Skirted Knob (Heater Switch). Skirted Knob (Sensitivity. Push-On Knob(

42、TestSwitch). Push-On Knob (Off-On-LifeSwitch). 1AmpLineFuse. InstructionBook. CompleteSetofIndex Cards. Tube Index. Carton. Tip Jack-Black. Tip Jack-Red. Grip Cap Assembly. Diode-RectifierTestLeads (Set). Page12 .w-5 .ASM-1 .,. . . . . . . .K-2 .K-2 .F-2 .PM-1 .PM-3 .ASM-9 . .J-3 . .ASM-2 . To:Servi

43、ce Representatives Theattached ServiceBulletinhas beensent.t oa l lregisteredof theModel650. Additional information thatshouldisfollows: 1onthelitetoa hes been donei natserial ontheAddresistor:been donein serial NumberonChangeR-20resistorbeen done inat Number6ontheR-18resistorbeen done i natapproxim

44、ately serial Number7on the attachedR-10resistorshas been donei nproduction a tserial additionalchangeisas Topick upt og ri dshort, twoaddedto the function switch.anda10megohm resistoradded t o perdiagrambelow.Thisdonea t serial .!-. followingareerrorsthe instructionmanual: 1 .Page6,6.Tube under test

45、hasplate returned groundof 2.Page7,lastparagraph.Should be headedandNPN Theerroneous informationremoved from thetube indexatserial 3. 1 . 2. 3. 5. 6. 7. prevention of possibleofliteusedasfuse. 6pent.- 6-73,- Readingsforthesocket- printed erroneously. wired as indicatedinsocket then are: Into t e s t

46、 theseWoes,socketnaybe TUBE 338863red 9571black 6 2 331 2 863red 71black INSTRUCTIONSFOROFFICIAL F O RBKMODEL A,Standard tubes maycalibratedinthe following manner. tubesofany one give type. Select 12 new Calibrate1fromeach of the following B .Group1Group 2Group3 Check these tubesinaBchecker that has

47、 been accurately calib- rated per instructionsandthatisconnected t oacontrolledlineac- curately s e tt o or sevenofthese tubeshave thesamereading on the meter. Select oneofthese tubes and label withreading obtained. These tubes canbe usedforfuture checkers sermced. Where high current tubesfallto one sideofstandard, opposite to reading ontubesofthevariety,it