Muitimeter
Tt,,,,t
Hewlewpackard
ManualPartNo MicrofichePartNo
PrintedAPRIL
Tableofcontents
C0NTENTSGontd
RABLEOFCONTENTSCont,d
Listofillustbations
Diagram Äl,il ?7l+eatic ?rorr
ACAdiGüffi
PorariryR,tüä
Frz
12ACCESSORIES.AVAITABLE
1lNTBoDucTl0N
0PT0NS
SPECTFtCATI0NS
14INSTBUMENT.AND Manualidentifica T I O N
35+o . os +o . o2s
Lo . t
Contd Specifications
Oo7 .005 .0m
8 1 5 0
O07 .oo5
SpecificationsCont,d
00fiv
1000.0v
24hours23o 10c
DVs/u
SectionI Model34904 GenerallnformationContd
Vin = vs/H rl
Dvs/H
REc
NTR0DtCTloN
Installation
INSTALLATION.OFOPTIONS
BenchUse
LsolatedData0utput0ption021-hp-111ZlAl
Option050andOption060
29INTERFACE.CONNECTIONS
Data0utput0ption021
RemoteGontrol0ption022
OPTtoN021
Fc ö
SectionII Model34904 7N i 3i -s t** JrJü,1t
REMOTEINPUTCONNECTORJ7
5 E E i F = =
2H* F EI = 6 s i ä 2 qd E ? 3 5 fr i F 3 ä
= ! 9 i l
RearInput
GeneralPurposelnterfaceBusConnections
Cablepart NO. Length
10631A 6 3 1 10631C
GeneralPurposeInterfaceBusConnectors
GPIBBUSCONNECTORJl2
9 9 f
Outguard
TriggerConnections,GPIB0ption030
Sample/HoldConnections,0ption040/045
D e l 3 4 9 0 a For J7 is -hp- Part No -0084 Amphenol
S7-30360-37s
Repackagingforshipment
SectionIII Model3490A
WARililG
Instbumentcapabilities
13FRONT.ANDREARPANELOESCRIPTION
15MAXIMUM.INPUTVOLTAGES
I7 . Generaloperatinginstructions
Turn-OnandWarm-Up
Guarding
FloatingMeasurements
SELF.TESTOPERATION
Acvoltagemeasurements
Resistancemeasurements
60.0hmsSignalVoltageandCurrent
OutputSignalsandLevels
InputConnections
62.0hmmeterSampteRateandBesponseTime
InputSignalRequirements
InputSignalsandLevels
79.0utputSignals
Data0utputlsolation
GPIBBusSignals
030
SRo
DAC
101Talk.0nlyNoController
103GPIB.Controlof3490A
RÄi+ -cg- lL
L l
Asciicodecharacter Binarycode Octal Code
To7
AddressCodes
ProgramCodes
A R a C T E R
2 3 4 5 6
USE
Ldav
F D
Printerand 3490A
349OAand
Will acceptdata
Printerwill
I X E D N I 1 J
GPIB0peratingExamPle
Ooü 0 f R \ r @üoü@f E \
SetsLREN LOWon bus
136Controlby.MarkedCardProgrammer
\tD?u6,.. TlE,, . ?5V
To haltprogram,press
SroP l CMD?U6 OUTPUT13,30 ..M3R7F@E
349OA PRoonnvr LrrruE,ir
Or o o l 4 0 z o
27 l
F r
158Input.SignalLimitations
160Sample/Hold.TriggerSignalRequirements
152Special.S/H0peratingGonsiderations
156Guard.ConnectioninSample/HoldMeaurements
165Initiating.Sample/HoldMeasurement
O40 O20
OtherOptions
040 030
173Using.theTrack/HoldMode
Typicaltimereouiredto SETTLETO1 %
200
1000v
Tnputvoltageat
M EO F S / HT R I G G E R
Voltageactually
Measured
179Using.theAcquire/HoldMode
V e
T a Vc-vs
T s
182Using.50Hz or 60Hz PowerSourceOptions 050or060
RatioMeasrementProcedure
$184.RATIOlfleasurements0ption080
$186.ExternalBeferenceVoltages
Model3490A
+3 . Generaltheoryofoperation
ßüy
4I . Intboduction
Display
RangeandFunctionControl
+19 .DCANAL0GCIRCUITS
LnputAttenuator
SwitchingCircuits
BoottrapCircuit
+23. DCAmPlifier
+25. OCAmplifierGain
Otui
Ls, ys
SectionIV Model3490A
Rt-- c-++
IntegratingAmplifier
Integratorcircuits
Dual-SlopeIntegration
L44. x 20Amplifier
ZercDetectAmplifier
52AC.CONVEBTEB
ACAttenuators
CurrentSource
HmmeterPowerSupply
Ohmsconverter
+70 ISPLAYASSEMBLYFigure
HmmeterReference
InputProtection
DisplayUnits
DataGounter
Buffers
TimingCounter
M I N G
10. Block Diagram,Main LogicASM Flow Chart
R0,0m
11. Block Diagram,Main LogicCircuits
Model3490A Tl-90.AlgorithmicStateMachine
TransferandZeroDetect
Enaele P U T S Enable Oualifierinput To ROM
105Input.PolarityStorage
+il5. DCSWTTCHNGLoGrC
+II7 . Referencesupplies
RatioMeasrements0ption080
+ I 7
+ t
Powersupplies
+128 .FBONTPANELS1VITCHING
+I32 . Self . Testfunction
134Logic.Test,No.l
Polarityin Ratio Measurements
G H
TurnoverError,TestNo.3
+137.10V RangeZero,TestNo.2
+143.0.1VRangeZero,TestNo.b
4145.x .01Atten.x, 100Gain,TestNo.6
+158 .DATAOUTPUTOPTION021
4t74.REM0TEC0NTR0t0PTtoN022
+r9
+188.ShiftRegisters
LocaURemoteFlip-Flop
DauFlag
198GPIB.System
+2r
GPIBSystemOperation
216Acquire/Hold.Mode
Figwe 4-23. WaveformslllustratingAcquire/Hold Mode
+212.SAMPLE/H0tD0PTl0Nll40or045
Too
Sample/HoldAnalogCircuits
+23
@ n z
Ja+z
Roo
Compensation
TooK
Flgure4-27. Sample/HoldLogic Block Diagram
228Sample/Hold.LogicCircuits
+25
Lye e outpur
DC Amp
512 615.0 1000v 124.4 154.O
External
Exterml Hold H Hehs
Page
Figurb4-30. Sample/HoldMeasurementSequence
Ortoroo OruY --Jl
Integrator
Waveformsarenot drawnto timeo, o,,rnI?lt
Example of TRACK/HOLD MEA Surementseouence
I-r Gort +prr2zrs.i Qrs Sre Ero-+ 3r4 Zra Orr
RIOLD A1 bHOLD B r l l
RecommendedTestEquipment
10kn
TNTB0DUCTIoN
Recommendedtesteouipment
Performancechecks S7. Performancetests
$9. Dcvoltmeteraccuracytest
Performancechecks
@ \ d
15OHMMETER.ACCURACYTESTS
L6. PreferredMethod
1OO
AC Voltmeter AccuracY
OhmmeterAccuracy
Pebformancechecks
ACCOMMON.MODEREJECTIONTEST
Dcvoltmeterinputresistancetest
S24.ACNORMAL.MODEREJECTION
Rrr-rrr--r
Model3490APERFOBMANGECHECKS
O o ?
28AC.VOLTMETEHINPUTIMPEDANCETEST
@ \ - O @ @ o o
Test Oscillator
MU L T I M E T E R h p 3 4 9 O a
6 5 2 a
Perfohmancechecks
RATI0PEBF0BMANCE0ption 080
$38. DC/DCRatioAccuracyTests
+ 100.000
S41.AC/DCRatioAccuracyTest
ExternalReferenceInputResistanceTest
45GPIB.0PEBATIONALCHECK0ption030
Ext Ref Nput Lnput Display Limits Range Voltage
Lo v Ranse
1000kO range
It l l K o
PERFORMANCECHECKSModel3490A
+tll
Fä il Ir fli
Fj Fl
IiI
Ii tti 1üj Li i l
R * ! i t F T
Rf,lIr i5i 1.+ri
I i , Il
It I l L1,1ti
Procedures
Adjustment
$ 51 .ADJUSTMENTPROCEOURES
Powebsupplyadjustment
Model3490AAOJUSTMENTPROCEDURESSectionV
Dczeroadjustments
$57. Referenceadjustments
Dc standardhp- 7a0Bis requiredfor these
69SAMPLE/HO.LDADJUSTMENTS
$66. Ohmmeteradjustments
Model3490AADJUSTMENTPROCEDURESSectionV
73.0ffsetAdjustment
$75. DielectricAbsorptionAdjustment
Dc standardhp- 7a0Bis requiredfor this
Aojustmentprocedures
Ratioreferenceadjustments
Lqe
Orrra
Adjustmentprocedures
ColTect
Perfobmance
Testrecord
Performancetestbecordcontd
001v r 0.oo1v
LO.V l O V 1 0
+ 1 2 . O O O
Performancetestrecorocontd
50000v Ooooov 120000v
Ext Ret Fngu V 1 0
00000v 10.üoo 12.0000v
Intboduction
Orderinginformation
NON.LISTEDPARTS
Proprietaryparts
Otv
Reference HPPartNumber
Description Mfr Mfr PartNumber Designation Code
B l e 6 1 . R e p l o c e q b l eP o r t s
Model
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 l
Rcor-@4o Leol-m4ol\
Oty
Reference
HP Part Numbel
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
B l e 6 1 . R e p l o c e o b l eP o r t s C o n r d
Qty
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 f
AI R3A AIR3@
28480 2a4AO
R t s l C o n t d f E p l o c e o b l e
B l e6
Aterei alnz?
Model 3490Ä
DesignationReference HPPartNumber
OtyDescription Mfr Code Mfr PartNumber
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
B l e 6 1 . R e p l o c e o b l eP q r t s l C o n t d l
Oaa+-rrtt $
Reeo-sg
DMT4LOON
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
R5ß7
A5s4 Sli2
Aoaroassyrehotejuxper
Oty
Cr r?21
CB a72l
?5r-orlo
Otv
Description Mfr Mfr PartNumber DesignationHPPartNumber Code
28aao
2A480
B l e 6 1 . R e p l o c e o b l ep o r r s C o n r d
Re*-ooar lil
Zroo rzaaAA
Orzo-oo+o
Description Mfr Mfr PartNumber Code
Reference HP Part Numbet otv
Designation
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
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
C8 ?2rl
C5 22at
DrT4LOara
ModeI34904
T u 2 I l 5 u
AI3CR8
O O E B R E a K D O I I N
R 2 r
Model Section
Caeleriaeon Ottgiitrdrei Isolatii Boardassy
Cableribbon
A22API
Heiioi
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
600
400
A27RI
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
A2ARI
Rfxd Cotp IOK OHX IOI L1Y
OBD
Z9cl 2 e c t 429C4 29C5
OHn 1trÄ 1/4W
I I P 22K otr lot
I P l2K OHI lot
A3IU3
A32RI
Reference HPPartNumbet oty Description Designation
Mfr Code
2211 2211 CB
A34YI
A39RA
2A4AO 2S4AO
T20/o
Reference HP Part Numbel
B l e 6 1 . R e p l o c e o b l eP or t s C o n t d
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
EIlrDtrs PosT assY
IcxssIs assY
284r0 2a+ao 2A480 28480 2g4AO 284aO
HPPartNumber
Description Mfr Mfr PartNumber
Reference
Xo1
Reference HP Part Number Designation
OtvDescription
Mfr Code Mfr Part Number
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
SectionVI
MP37 MP23
MP7
Designator L M P l a MP1B M P l C MP1D MP2 MP3 MP4 MP5 MP6
318x32
29500043
Pbeliminarytroubleshooting
ACCESSF0RSERVtCtNG
Troubleshootingtrees
Powersupplychecks
TableT-2. PowerSupplyJumperWires
13DC.ANAL0cCtRCUtTS
AZAsemblyExchange
DCAmplifierChecks
DCAmplifierSwitchingGircuits
Nlii
A N D 0 V L E V E L S O C C U R a T
I G G E R S C O P E a T a 1 T P K , + S L O P E
3I .INTEGRATOR Troubleshooting
33AC. Convebtertroubleshooting
37OHMS. Convertebtroubleshooting
21A. -to-C0NVERSt0ND CtBCUtTCHECKS
Displaytroubteshooting
Logictboubleshootingsuggestions
65SAMPTE/HOLD.TROUBLESHOOTINGTREES
ExternalTriggerCircuitGheck
59SAMPLE/HOLD.SERVICING
Accesto Sample/HoldGircuits
22000139
03490-006M
03490€6528
O3490-27301
AmplifierZerc0ffset
75SCHEMATIC.NOTES
RATIO.TBOUBLESHOOTING
Logicgatesymbols
+ 5
Truth Table
Truth Table
SectionVII Model3490A AlphabeticalListingof 34g0A Mnemonics
U 4 o t
Alu401 Rexe
Nrsc
Tl-l
= l
IaFeV-pF
Guspb b l
Page
I1Lgji
I1glil
Rtl7-r2
Iai ott *nn !drp6 ltnt. rync,+.1@
+ Input
@ @@
Ll?Qxl c207c2or
3ttr . n
? 1 t 6 1 l 7 + T i + ?
UiL
T E
Q208
YES
Q2O5 t1 swith
3 6 m s i 4
AITPK. +
Ratio INT
R317-1
O2or
0205
0208
+.JL
RaG
LfT
Q9e
See Notes
299A
?rSlI
14,iä
Ffi
1s17-t6
Ov1--t==- -l6oms
LOomsF
R7vl l
Tlrtlt Wath AnDr
Rd 15 ot Altrt. JFuldbo+5V Lm r . tt
Llo
Tlrtlt Wath AnDr
R7l7-r8
Troubl .. hoor A7Ot ?CRIOüa ll
#lsriieo,e*l
Eff#ri
Iub s!!h
I l
DisplayTroubleshootingTree
T9lt
L i l t l
T l
=LJ. L--l
ITa --- it
Ru*rffifc
TEv
O 1 o
NVW
Page
O24 oo24 @24 oo24 9032 oo24 t.o24 n 4 n2.4
Lirlt?lt..it \- toresh@rArur5 aIut1 J
3t,1
Lop
Initiare 6 mre smples
Displaysholdread
+ 10.oo24
+ 60O0.xxOL
Tl=l
S l . l
LDr s
€@CI6@@e#ffi
+ 5 n-s l r
S +
Otuu U.T,J,l,,t-t
Ttj ,o
+ i O 5 4 s F
+5 ms-l
10. Logic Clock TroubleshootingTree
2317-1
THttttffi
L sl \f -Jt +1 l
$E B?tr+1HHHLE r r r r r r r l
+ft$b!too
L- l l---,.l
Us-l Url
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Pulses
1-t.i1
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Ti1i
2s17-26
= b3mtl
I. J?
Ffi
At7A2
Gig
Tlu2, a t1u3,Arl
NOI€S
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Th.-l
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Figare7-12.RemoteTroubleshootingTree,Option022 2717-28
RtN*16t12
+s-Yml
+o.cF
Start
9 0 D- 3 3 8
Hffi3
338r
13. GPIBI/O TroubleshootingTree,Option030 2917-30
Cauil oN . l
Öl--.le
Hp Porl No O Rev . B
Port No V . C
D a
A27KI Shoulo 8€ CLOSED.SET SAM
Correcn
CABLESCORRECTLYGO. to
SET S/H Sayitch to TFACK/HOLD
Main CIRC-IIT8OAFO. Shouloae
T3t17-32
Oft-.*l
9 0 D 3 4 3
HOLD. M€ASURE Voltage AT
I,l
Hp Fort No -66527 Rev.B
Port No . O349O Rev . C
To A2 X E
8Ap-crtot awrcH To rRcx
Eogeof .AIPLIHOU TRIGGCR!G
Iore Sigial G€S High
Tote
Ffi.f-L
JüJ
RävnG.iir
3 f r a
73317-34
3490-0
Hp Pott No.O349O
EXT REF TPC
P U T
LOW
P U T TPC
LOW
High
TPC A13CR6
G H LOW G H LOW H I G H L O W
TPC
+ l 0
16. Ratio TroubleshootingTree
A12 A17 A22 A11 3 or A36 A34 A35 A30
A33
A31 Rearof Instrument
€ d
I11
Ral
111
+++F+r@a
Jj,i @ @.6r
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Rö*et e J l
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737
FP?fä
WüE,Ä,li
REFEBETTCEDESIöTATIOtIS
CoKno
LelQg
Lli-@@@@@@@
Ilgt,,a ,,r.i.li
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Overloadprotection
Hovpoverloaoprotectionh
Bootstrap P L I F I E R
T6azt
RuorerzV AA
A M P L I F I E R
? z e 1 2 z
\+l
Feedbackattenuator
$E?
Z r z l
391740
Zl-----l
9i czo1
@$Y@ Y 6ö Ff$$**H++
?o70 f
IRrr5- l .FrrBll- l Pt lP r f
Lp/0 Al I MArNcrRcurrassEMBLYo34so 6650r +ov +rov
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SueeLv +rzV ----d-tr-E +tzv +5V +5v TZV TZV ---b
C203 o.33
T7v- t7v CR202
1411742
Zero Detect
Faq h-,,dn
Tf,rl
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Rblhb-l- --,1
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F E R E N Cpeo L a R I T YL O G I C
+REFERENCESUPPLY
V E R T I N G P L I F I E R
Figr
7431744
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P .L.iU.B Ll 11
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Regulator
TOAa
Grppry Optrorr Assr Ozot
5117-s2
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+3OV Regulator
3OV Regulator
BCD
Hp Port No.O349O-66503
REV . B
Enable
Roaru4oreil
=i33SfTHr-+
Polaritydisplay
Polaritydisplay Enable
U4,uro
A N N E R a T O R
Scan Decoder
Figwe 7-27. SchematicDiagram,Display, A3
Io*F
S3l7-s4
Ra FE FA FB
R C U I TS I D E
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Componentside
S l r q r l
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Converteramplifier
+ r 7
Figwe 7-29. SchematicDiagram,AC Converter,A6
S7l7-s
Filter
Nc corvepreR ourPUT1
UeacpalpueHuoll3as
Drluod O6t9O-20999
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Data Multiplexers
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74317-64
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LOCAL/ Remote FLIP- Flop
LOCAL/REMOTE
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AJtlilo-*il1.iI
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COPYRIGHTt973 by Hewlett Packaro
36.BlockDiagram,3490AGPIBVOCircuits 7117-72
FC Company
L24-----r3-l Or5
Hp Port N o . O 3 4 9 O 6 6 5 3 4 R e v .A
Hp Porr N 0 3 4 9 0 6 6 5 3 6 Rev a
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