Manuals / Brands / Car Audio and Video / Car Stereo System / HP / Car Audio and Video / Car Stereo System

HP Car 3490A 5-73.0ffsetAdjustment, $75. DielectricAbsorptionAdjustment, Model3490AADJUSTMENTPROCEDURESSectionV, 5:76.A dc standard(hp- 7a0B)is requiredfor this

1 298

Download 298 pages, 23.29 Mb

Model3490AADJUSTMENTPROCEDURESSectionV

a.Removethe toP guard cover.

b.Locate the white/black wire just to the rear of the display cable connector. This wire is labeled "5th Digit Blank" in Figure 5-10. Disconnect this wire from Test Point L and connect to Test Point M. This restoresthe display to five full digits for Sample/Hold measurements, providing greater resolution in order to make the following adjustmentsmore accurately.

c.Set 3490A FTINCTIONto DC, RANGE to IO V. SAMPLE/HOLD to TRACK/HOLD, SAMPLE RATE to HOLD. Short input Higfr to Low.

d.Connect digital voltmeter between A27TP3 and groundtest point on AlAl. Recordvoltagereading.

e.Connectjumper wire betweenTestPoint LTST on A28 and ground.

f.Set SAMPLE/HOLD switch to OFF. then back to

TRACK/HOLD.

g.Adjust A27Rl4, Gain Adjust, for digital voltmeter readingthe sameasthat noted in step d I 0.0005 V.

h.Dsconnect digital voltmeter and remove jumper wire betweenLTST and ground.

5-73.0ffsetAdjustment.

5-74. This procedure adjusts the Offset Amplifier so that there is no turnover error between positive and negativeinputs. A dc standard(-hp 7a0B) is required.

a. With 3490A set to IOVDC RANGE, TRACK/ HOLD, and input shortedas in previousadjustment,set SAMPLE RATE fully clockwise.

b.Adjust A27Rl3, Offset,for 3490A displayof zero t 0.0001v.

c.Dsconnect input short and connect dc standard to input terminals. Set standard output to + 10.0000V. Note 3490A reading.

d.Reversepolarity of input (to - 10.0000V) and note reading- Disregarding polarity display, adjust

A27Rl3 to split the difference between the readingsin

stepc and stepd.	Ii'

e.Continue reversinginput polarity and adjusting A27Rl3 until there is no numericaldifferencebetween readingswith positive and negativeinputs.

$75. DielectricAbsorptionAdjustment.

i. Replacetop guard cover and securewith only two	5:76.A dc standard(hp- 7a0B)is requiredfor this
i. Replacetop guard cover and securewith only two	procedure, which adjuststhe dielectric absorption com-
screws.	pensation.

sth DtGtT

BLANK

A27TP3

A27R14

A 2 7 R 1 3

Figure5-10. Locationof Sample/HoldAdlustments.

5-17

Contents

HEWLETT PACKARD HEWLE"WPACKARD CERTIFICATIOtII W A R R A ] T TAYT D A S S I S T A I T C E MUtTIM ETER TABLEOFCONTENTS TABLE0F C0NTENTS(Gont'd) rABLEOFCONTENTS(Cont,d) Tableof ContentsModel34904 LISTOFILLUSTBATIONS Figure Line VoltageSelection . . .2-l ohil"a;;a;;;;i : . il 2 - : 3-8.Abti,ty;iöör6l"rä,oic,iirl "'3-21 GENERATINFORMATION 1 . 14INSTBUMENT.AND MANUALIDENTIFICA - T I O N i I;IBBBBV lo . zs*o . oo (Cont'd) Table1-1.Specifications t o .oo7 .005 .0m .o07 .oo5 Table1-1.Specifications(Cont,d.) r 1.00fi)v 10.q)0v 24hours(23o r 10c) Model34904 Table1-2.Generallnformation(Cont'd.) vs/n =vin+ Kl _f,r dVs/u vin = vs/H - rl S E C T I OtNl INSTATI.ATIONAND I N T E R F A C E 2 . 16INSTALLATION 2-17.BenchUse 2 . 21INSTALLATION.OFOPTIONS 2-23.lsolatedData0utput0ption021(-hp-111ZlAl 2-25.fsolatedBemote0ption022(-hp11122A1 Model3490ASectionIl 2-27.Option050andOption060 2 - 29INTERFACE.CONNECTIONS 2-30.Data0utput0ption021 2-32.RemoteGontrol0ption022 T,i",,*lJ.i: f: ,1.,t;: 5 2H* F EI = 6 s i ä 2" - qd E ; ? 3 5 fr i F 3 ä E ; ? 3 5 fr i F 3 ä 3 9 H ; ; 5 E E i F ä - j = ! 9 i l E F ! ! A 1 0 0 0 v , 1 0 0 0 k o L 10,000ko 2-34.RearInput 2-36.GeneralPurposelnterfaceBusConnections Table2-2.GeneralPurposeInterfaceBusConnectors GPIBBUSCONNECTORJl2 9 9 9 9 f Figure2-9.GeneralPurposelnterfaceBusConnections T R I G G E RC O N N E C T OJRl o o o o o z Z z z z z z Figure2-10.TriggerConnections,GPIB Option 2-40.TriggerConnections,GPIB0ption030 241.Figure 2-10shows the rear panel Trigger con s7-30360-37s) 2 . 46 .REPACKAGINGFORSHIPMENT SectionIII Figure 31. Front and RearPanel S E C T I OINII O P E R A T I NI NGS T R U C T I O N S 3 . I7 . GENERALOPERATINGINSTRUCTIONS 3-18.Turn-OnandWarm-Up 3-20.Guarding 3-24.FloatingMeasurements 3-26.0verrangeMeasürements 3-28.OverloadIndication 3-30.BangeIndication 3-32.FunctionIndication 3-34.Autoranging AlR429 3-42.DCSampleRateandResponseTime Table 3-2.SampleRateand ResponseTime 3-44.Input Resistance Input resistancein the dc function is greaterthan Pilä:::",----__1_r Figure3-4.ExternalTriggerSequence(Option 020) 3-66.DATA0UTPUT(Option021) measurement function 3-77.InputSignalRequirements L *"nn 3-71.InputSignalsandLevels 3-73.Data0utputlsolation 3 - 75REMOTE.C0NTROL(0ption022) 3 - 87GENERAL.PURPOSEINTERFACEBUSI/O (0ption 3-101Talk.0nly(NoController) 3-103GPIB.Controlof3490A Table3-6.AddressCodes 'to7 r sampling with the Table3-7.ProgramCodes Hold line may be _ i - l Page Figure3-9.TimingDiagram,3490AAddressedto Talk outputted in the following format: (Example listing: NDCfXXXXXXE-Y) StatusCodeAlpha NNormal Operation OL Overload xX)c()ü EExponentIdentifier Polarity of Exponent YExponent(RangeDigit) C R CarriageReturn LF Line Feed OrPR'Nrr@[STORE To haltprogram,press sroPl 1 0 CMD"?U6 20 OUTPUT(13,30)..M3R7F@E"; L-J 3Q FORMATB 3-136Controlby.MarkedCardProgrammer c\tD"?u6",.. TlE",, . ?5V rffi'slisli r.l.i...l*jiiä='8ffifr 349OA PRoonnvr lrrruE],'ir E i r i r 3-152Special.S/H0peratingGonsiderations 3-156Guard.ConnectioninSample/HoldMeaurements 3-158Input.SignalLimitations 3-160Sample/Hold.TriggerSignalRequirements 30v/s 3-165Initiating.Sample/HoldMeasurement 3 - t t o 3-173Using.theTrack/HoldMode I A r 3-r9 v s - v e T s - T a Vc-vs T c - T s SlopeBC- SlopeAB 3-182Using.50Hzor 60Hz PowerSource(Options 050or060) $184.RATIOlf'leasurements(0ption080) $186.ExternalBeferenceVoltages 3-188lnput.Connections 3-190Ratio.Display Page SECTIONIV T H E O ROYF O P E R A T I O N Ftgure4-2.BasicDiagramand Operation 415. Display ,1-16 (Test "overload +23. DCAmPlifier +25. OCAmplifierGain 4-27.SwitchingCircuits 4-29.BoottrapCircuit 4-35.LeakageGontrol i'Xk tt Figure4-4(b).MeasuibmentSequenceNotes 4.39.INTEGRATORCIRCUITS 440. Dual-SlopeIntegration 442. IntegratingAmplifier L44. x 20Amplifier 446. ZercDetectAmplifier 4 . 52AC.CONVEBTEB 4-54.ACAttenuators 4-56.ConverterAmplifier 4.60.OHMSCONVERTER 4-62.CurrentSource 464. 0hmmeterPowerSupply I ,oo 466. 0hmmeterReference 468. InputProtection +70. 0ISPLAYASSEMBLY(Figure 7-2?) 484. DataGounter 486. Buffers 4-88.TimingCounter Figure4-10.Block Diagram,Main LogicASM Flow Chart + 1 tl-90.AlgorithmicStateMachine 4-lr 4-105Input.PolarityStorage 4-107.TransferandZeroDetect SectionIV 4113.OvedoadStorage +il5. DCSWTTCH|NGLoGrC +II7 . REFERENCESUPPLIES ll.l 18. VoltageMea$rements 4-122.RatioMeasrements(0ption080) +128 .FBONTPANELS1VITCHING 4130.POWERSUPPLIES + t +I32 . SELF . TESTFUNCTION 4-134Logic.Test,No.l +137.10V RangeZero,TestNo.2 4139.TurnoverError,TestNo.3 4141.+ ReferenceCheck,TestNo.4 7-3r) 4150.0utguardPowerSupply It-l54.Sample/HoldTriggerCircuits +158 .DATAOUTPUTOPTION021 4-160.DataMultiplexers courPursl 4-162Data.OutputSequentialLogic 4t74.REM0TEC0NTR0t0PTtoN022 l}176.Gircuitlsolation 4-178.RemoreEnable 4180.0utguardMultiplexer +184.ProgramFlag +188.ShiftRegisters 4-192. LocaURemoteFlip-Flop 4194. DauFlag 4 . 196GENERAL.PURPOSEINTERFACEBUSI/O (0PTtoN 030) 4201.BasicTheoryofGPIBl/0 Circuits 4-202.The3490AGPIBcircuitsemploytwoseparate 4-204.GPIBSystemOperation +2r +212.SAMPLE/H0tD0PTl0Nll40or045 4-216Acquire/Hold.Mode 4:220. Waveforms shown in Figure 4-31illustrate the sine wave notations indicate the events occurring during the measurementsequence'In measurements Ja+z c r 2 4-228Sample/Hold.LogicCircuits +25 ;s,t3i5'/rp,ly,ffi Page Figurb4-30.Sample/HoldMeasurementSequence j-tE . / I; rt *ai 1 . Waveformsarenotdrawnto timeo, "o,,rn"I?[lt Page SectionV Table5-1.RecommendedTestEquipment 5-C S E C T I OVN MAINTENANCE @ \ : d o - o o o 5 . 15OHMMETER.ACCURACYTESTS 5-l6.PreferredMethod 5 . 20DC.COMMON - MODEREJECTIONTEST PERFOBMANCECHECKS PEBFORMANCECHECKS 5.22.ACCOMMON.MODEREJECTIONTEST NMR= 20los 5.26.DCVOLTMETERINPUTRESISTANCETEST r-------l o o Model3490APERFOBMANGECHECKS ö ö o rrr-rrr--r] o o o o 5-28AC.VOLTMETEHINPUTIMPEDANCETEST ' e ( o ) @ L @ ' \ - - O @ - @ o o Figure5-6.AC Voltmeter Input lmpedanceTest with the Sample/Hold performance tests. Refer to Paragraph5-9 PERFOHMANCECHECKS 536. RATI0PEBF0BMANCE(0ption 080) $38. DC/DCRatioAccuracyTests S41.AC/DCRatioAccuracyTest i ) Rlo v Ranse 4 ) it l l K o PERFORMANCECHECKSModel3490A 1000kO range 1+tll i:j,.H"'," :+ r::::f,.li:r iiF:i,l'.l"ir i ü:l-rii::r:i t-.::i; FiIlLt :l ::l il i [:r I F ü t J t J l ' : : " F Address3490Ato listen,9820Ato talk.Program34904to IO,OOOkQ range " ';'t t::i'1It wARiltr{G vu ADJUSTMENTPROCEDUBES Model3490AADJUSTMENTPROCEDURESSectionV 5-73.0ffsetAdjustment $75. DielectricAbsorptionAdjustment 5:76.A dc standard(hp- 7a0B)is requiredfor this AOJUSTMENTPROCEDURES g,lqe A t 5.79.RATIOREFERENCEADJUSTMENTS ADJUSTMENTPROCEDURES Adjust efgni (Bias. Atlj.) negative 0'0005V PERFOBMANCE TESTRECORD 10.0100ov r0.05000v ro.100OOV PERFORMANCETESTBECORD(CONT'D} Range Input 1 V 1 V r 1 V r 1.0oooov PERFORMANCETESTRECORO(CONT'D} .:. ExtRet F"ngu 11; 1 g v - 1 0 REPLACEABLEPARTS T o b l e 6 - 1 . R e p l o c e q b l eP o r t s Reference HPPartNumber otv Mfr Mfr PartNumber Code orro-nnrr$$ Reference HPPartNumber otv T q b l e 6 - 1 . R e p l o c e o b l eP o r l s ( C o n t ' d ) HP Part Numbel oty HPPartNumbet atv atv Qty T o b l e6 p o r t s l C o n t ' d f - 1 .R e p l o c e o b l e HPPartNumber oty T o b l e 6 - 1 .R e p l o c e o b l eP o r t s ( C o n t ' d ) otyDescription Reference HPPartNumber oty Page Page DesignationHPPartNumber Numbet oty DesignationHPPart T o b l e 6 - 1 . R e p l o c e o b l eP o r t s ( C o n t ' d ) Reference HP Part Numbet otv Designation T o b l e 6 - 1 . R e p l o c e o b l eP o r r s ( C o n t ' d ) Reference HPPartNumbet atv Gode Page Page HPPartNumber aty aty T o b l e 6 - 1 . R e p l o c e o b l eP o r t s l C o n t ' d ) Qtv T o b l e 6 - 1 . R e p l o c e o b l eP o r l s ( C o n t ' d ) Reference HPPartNumbel oty Page HPPart HPPartNumbet oty Reference HPPartNumbet otv T o b l e 6 - 1 . R e p l o c e o b l eP or t s ( C o n t ' d ) Reference HP Part Numbel T o b l e 6 - 1 . R e p l o c e q b l eP o r t s ( C o n t ' d ) HPPartNumber Reference HP Part Number HP Part Number T o b l e 6 - l . R e p l o c e o b l eP o r t s l C o n t ' d l otvDescription Figure6-1.ChassisParts P\ \*o0 Figure6-2.BindingPostAssembly HEXNUT Figure63. Switch Assembly SECTIONVII TBOUBTESHOOTINGAND C I R C U IDT I A G R A M S 7 . 13DC.ANAL0cCtRCUtTS 7-15.AZAsemblyExchange 7-17.DCAmplifierChecks Figure7-1.SwitchingInputsto A2U2 nlii Figure7-2.SwitchingOutputsof A1U401 Amplifier adiusted 7-25.ReplacementofOCR30l 7-26. If it is necessaryto replacethe referencetransis tor alsonecessaryto replaceresistors 7.40.DISPLAYTROUBTESHOOTING Table7-5.DataOutput TroubleshootingTips 7-8 mav be a defective display'The 7-57.ExternalTriggerCircuitGheck 7 . 59SAMPLE/HOLD.SERVICING 7-60.AccestoSample/HoldGircuits 7-63.0peratingthe3490AwithSample/HoldAssem-hliesRemoved 7 . 65SAMPTE/HOLD.TROUBLESHOOTINGTREES L 03490-006(M 03490€6528 o3490-27301 220047o'4 7 . 67RATIO.TBOUBLESHOOTING 7-71.AmplifierZerc0ffset 7.75SCHEMATIC.NOTES l.l------l Denotesfront panelmarkings " 3 Denotesschematicnumberon which con 7.77.LOGICGATESYMBOLS NAND GATE + 5 Table7-6.AlphabeticalListingof 34g0A Mnemonics A r u 4 o t Alu401 r_exe nrsc 'n 'ft^ 'n^ Tt ,Ll Page i1:L;gji JIIIL s $ sEIJ - *I -uiL :irsul Figure7-5.DC AnalogTroubleshootingTree 7-r317-1 L--l I ce | -co =FÄl- LJ l'l- ll l l t f ol LfT Page , , iliii#;, ,i ;_r;;rs6tl .14,iä :*,rii'.i *iii,tif6l:..it@i6 . .ffi "-*"rti,"r , Il Figure7-6.AC ConverterTroubleshootinsTree 7-1s17-t6 ; . ä Page Page Figure7-7.OhmsConverterTroubleshootingTre€ 7-r7l7-r8 t _ iub _ s!!h "jl ä ä i l e*-ä,ii *i ru*nir+lU "TT Page [El* !#W.' ü::iliiff f*tEv: ru*rffifc 00 l,; Page Page f-l f-_l Figure7-9.Lo Figure7-9.Logic TestTroubleshootingTree 'ä-'äfu _,;ljl otuu' U.T:'"",'J"',l,:,t-:t ';1;: t'tj ,o." 1 Figure7-10.Logic Clock TroubleshootingTree 7-2317-)1 *8o5Tr ts -r r@++@+f*****io us-l I- u,-l l.'l l'- l 'l---,.l l-ll't A l o U 1 . U t l ;.,,\AA& *#ll :,i ::i ;;i,:i ti'1::i.'::":: i- , ea . f :'J.'l Figure7-11.Data Output TroubleshootingTree,Option 7-2s17-26 i-------g-----+* +t* I i!-u;it Page - 1 =r^F t'"'h."'-l .::LfLr -ilLJ_LT Page Hffi3 Figure7-13.GPIBI/O TroubleshootingTree,Option030 (6äl * ü ü * * ä TTTTTT hp Porl No. 0349O Rev. B f-------t [ - o nf-l-üi .F;t Figure7-14.Sample/HoldGeneralTroubleshootingTree 't3t17-32 il---"i,l H [ l - ] 1 , , 'I A 2 Port No. O349O-66528 Rev. C ;,t:r.1i l,ffi.f-L 'JüJ F Figure7-15.Sample/HoldLogicTroubleshootingTree Page Page Page Page Figure7-16.Ratio TroubleshootingTree 't-35 A33 AS2 A31 Rearof Instrument Figure7-17.Locationof Assemblies r€ d .;;rl smc@P??q lil'iil+s ;;liüi s g pnE eeagtl * ll .i-J -::ff-"@. oooooo sf@ *EfEU Page --<eL @6'@@@@ggfggg;s@-- rzvd ööF$?f-looooooo - - - VT - - - - - -V1 -T6az ruorerzV AA 2--J ' A i l 'Y ,zl-----_l: l o z r z l $E yt) $rs*$roffiaCI -A t l ,A?fli ffi Zero glw ott,"t {'itu - ^ ^ - ^ ^ ü l l l?-rv ( F /^"'i;; -l l I u3o! ->---t l : l " L - r l - l 'n l ' l "r1 :;.:.;ä:,?ääij'O( * 9sö$ r',u l-r.o*." n i!g!"?if'iJjscaNBH POWERFROM -5v---dä-!-- -" IP*33|]3 7 1 3 1 6 t L --\------lJ sior'ra Figure7-23.SchematicDiagram,Clock and Counters "i t+*truuiit l.-i3Bl,"J-r l-rua--' I xma I nne--r LHur i 3bEi,?#'^ röüärrrr-l BrE**#'^ 5'8 l8'd',tshäl 3Yä1.^.dP Figure7-24. SchematicDiagram,Main Logic, Al il ;J ; 3 C ; E : r E i i + { +{ i + pp* @@@@@@@@@@@@ @@@@@@@*späsw: i'a;|"*;,,ilJ**io**l.Io,l ,. lffioi o ( - -- - ) ,, [**6'ffi-l { . ( - - - :- - - - ) . F [--soue.e,."oloieftil-l :( - - - ' - - - - ) '-l [-soupr-Ezro-r-oirfr Figure7-25.SchematicDiagram,DC SwitchingLogic, A 1 v @ '';,,,:t l . : 3::,i .. ..'.. ,',..oR Figure7-26. SchematicDiagram,PowerSupplies,Al, A8 7-5117-s2 |--*-l 8 roaru4oreil i=i33'SfTH[r-+: r - A Tl-: u4,uro T..,-"J - l Y, + Figwe 7-27.SchematicDiagram,Display,A3 7-s3l7-s4 = E MA|N CTRCUTTASSEMELY*"-r.t tE(03490-oro- 6650t)-u*oi t tffiJ--*orie-r*E oG 'ä;glYr {-#'-d.ir'l , l o4-f\1, Il Figure7-28.SchematicDiagram,Function,Range,and Sample Rate Switches.A5 t ll l : ? ? l l l ***re4***l t 3 l l,lu -R,B-----lTtl--R4a-n l-t-=""+t <---r oot Figwe 7-29.SchematicDiagram,AC Converter,A6 1-s7l7-s ''i-i6L_lULJi *co",c'ifl3?;5fö ,,J.[li,iBlflt {v:rx) ,vnorlrr,rn: .mJ -4.rF :tr'-Ei Page r--r I t . l U l , U A22Al Z'"'+.gntl,"*LS ' l " l .;;i '. ';,1 ,-'i wro Figure7-31.SchematicDagram, External Trigger Circuits,A8,A22, A29, A37 * J l ' " 1 'l l , r [ u ; - - - l