Tt,,,,t
Muitimeter
Hewlewpackard
PrintedAPRIL
ManualPartNo MicrofichePartNo
Tableofcontents
C0NTENTSGontd
RABLEOFCONTENTSCont,d
Listofillustbations
Frz
Diagram Äl,il ?7l+eatic ?rorr
ACAdiGüffi
PorariryR,tüä
SPECTFtCATI0NS
12ACCESSORIES.AVAITABLE
1lNTBoDucTl0N
0PT0NS
14INSTBUMENT.AND Manualidentifica T I O N
Lo . t
35+o . os +o . o2s
O07 .oo5
Contd Specifications
Oo7 .005 .0m
8 1 5 0
24hours23o 10c
SpecificationsCont,d
00fiv
1000.0v
Dvs/H
DVs/u
SectionI Model34904 GenerallnformationContd
Vin = vs/H rl
NTR0DtCTloN
REc
LsolatedData0utput0ption021-hp-111ZlAl
Installation
INSTALLATION.OFOPTIONS
BenchUse
RemoteGontrol0ption022
Option050andOption060
29INTERFACE.CONNECTIONS
Data0utput0ption021
Fc ö
SectionII Model34904 7N i 3i -s t** JrJü,1t
OPTtoN021
= ! 9 i l
REMOTEINPUTCONNECTORJ7
5 E E i F = =
2H* F EI = 6 s i ä 2 qd E ? 3 5 fr i F 3 ä
10631A 6 3 1 10631C
RearInput
GeneralPurposelnterfaceBusConnections
Cablepart NO. Length
Outguard
GeneralPurposeInterfaceBusConnectors
GPIBBUSCONNECTORJl2
9 9 f
Sample/HoldConnections,0ption040/045
TriggerConnections,GPIB0ption030
S7-30360-37s
Repackagingforshipment
D e l 3 4 9 0 a For J7 is -hp- Part No -0084 Amphenol
SectionIII Model3490A
15MAXIMUM.INPUTVOLTAGES
WARililG
Instbumentcapabilities
13FRONT.ANDREARPANELOESCRIPTION
FloatingMeasurements
I7 . Generaloperatinginstructions
Turn-OnandWarm-Up
Guarding
SELF.TESTOPERATION
Resistancemeasurements
Acvoltagemeasurements
62.0hmmeterSampteRateandBesponseTime
60.0hmsSignalVoltageandCurrent
OutputSignalsandLevels
InputConnections
Data0utputlsolation
InputSignalRequirements
InputSignalsandLevels
79.0utputSignals
DAC
GPIBBusSignals
030
SRo
L l
101Talk.0nlyNoController
103GPIB.Controlof3490A
RÄi+ -cg- lL
To7
AddressCodes
Asciicodecharacter Binarycode Octal Code
USE
ProgramCodes
A R a C T E R
2 3 4 5 6
F D
Ldav
Printerwill
Printerand 3490A
349OAand
Will acceptdata
SetsLREN LOWon bus
I X E D N I 1 J
GPIB0peratingExamPle
Ooü 0 f R \ r @üoü@f E \
SroP l CMD?U6 OUTPUT13,30 ..M3R7F@E
136Controlby.MarkedCardProgrammer
\tD?u6,.. TlE,, . ?5V
To haltprogram,press
F r
349OA PRoonnvr LrrruE,ir
Or o o l 4 0 z o
27 l
156Guard.ConnectioninSample/HoldMeaurements
158Input.SignalLimitations
160Sample/Hold.TriggerSignalRequirements
152Special.S/H0peratingGonsiderations
040 030
165Initiating.Sample/HoldMeasurement
O40 O20
OtherOptions
1000v
173Using.theTrack/HoldMode
Typicaltimereouiredto SETTLETO1 %
200
Measured
Tnputvoltageat
M EO F S / HT R I G G E R
Voltageactually
T s
179Using.theAcquire/HoldMode
V e
T a Vc-vs
$186.ExternalBeferenceVoltages
182Using.50Hz or 60Hz PowerSourceOptions 050or060
RatioMeasrementProcedure
$184.RATIOlfleasurements0ption080
Model3490A
ßüy
4I . Intboduction
+3 . Generaltheoryofoperation
LnputAttenuator
Display
RangeandFunctionControl
+19 .DCANAL0GCIRCUITS
+25. OCAmplifierGain
SwitchingCircuits
BoottrapCircuit
+23. DCAmPlifier
Rt-- c-++
Otui
Ls, ys
SectionIV Model3490A
Integratorcircuits
Dual-SlopeIntegration
IntegratingAmplifier
ACAttenuators
L44. x 20Amplifier
ZercDetectAmplifier
52AC.CONVEBTEB
HmmeterPowerSupply
Ohmsconverter
CurrentSource
DisplayUnits
+70 ISPLAYASSEMBLYFigure
HmmeterReference
InputProtection
M I N G
DataGounter
Buffers
TimingCounter
R0,0m
10. Block Diagram,Main LogicASM Flow Chart
Model3490A Tl-90.AlgorithmicStateMachine
11. Block Diagram,Main LogicCircuits
Enaele P U T S Enable Oualifierinput To ROM
105Input.PolarityStorage
TransferandZeroDetect
+II7 . Referencesupplies
+il5. DCSWTTCHNGLoGrC
+ I 7
RatioMeasrements0ption080
Powersupplies
+128 .FBONTPANELS1VITCHING
+ t
G H
+I32 . Self . Testfunction
134Logic.Test,No.l
Polarityin Ratio Measurements
4145.x .01Atten.x, 100Gain,TestNo.6
TurnoverError,TestNo.3
+137.10V RangeZero,TestNo.2
+143.0.1VRangeZero,TestNo.b
+158 .DATAOUTPUTOPTION021
+r9
4t74.REM0TEC0NTR0t0PTtoN022
198GPIB.System
+188.ShiftRegisters
LocaURemoteFlip-Flop
DauFlag
GPIBSystemOperation
+2r
Figwe 4-23. WaveformslllustratingAcquire/Hold Mode
+212.SAMPLE/H0tD0PTl0Nll40or045
216Acquire/Hold.Mode
@ n z
Too
Sample/HoldAnalogCircuits
+23
TooK
Ja+z
Roo
Compensation
Lye e outpur
Flgure4-27. Sample/HoldLogic Block Diagram
228Sample/Hold.LogicCircuits
+25
Exterml Hold H Hehs
DC Amp
512 615.0 1000v 124.4 154.O
External
Page
Ortoroo OruY --Jl
Figurb4-30. Sample/HoldMeasurementSequence
Waveformsarenot drawnto timeo, o,,rnI?lt
Example of TRACK/HOLD MEA Surementseouence
Integrator
RIOLD A1 bHOLD B r l l
I-r Gort +prr2zrs.i Qrs Sre Ero-+ 3r4 Zra Orr
10kn
RecommendedTestEquipment
$9. Dcvoltmeteraccuracytest
TNTB0DUCTIoN
Recommendedtesteouipment
Performancechecks S7. Performancetests
L6. PreferredMethod
Performancechecks
@ \ d
15OHMMETER.ACCURACYTESTS
AC Voltmeter AccuracY
OhmmeterAccuracy
1OO
S24.ACNORMAL.MODEREJECTION
Pebformancechecks
ACCOMMON.MODEREJECTIONTEST
Dcvoltmeterinputresistancetest
28AC.VOLTMETEHINPUTIMPEDANCETEST
Rrr-rrr--r
Model3490APERFOBMANGECHECKS
O o ?
6 5 2 a
@ \ - O @ @ o o
Test Oscillator
MU L T I M E T E R h p 3 4 9 O a
+ 100.000
Perfohmancechecks
RATI0PEBF0BMANCE0ption 080
$38. DC/DCRatioAccuracyTests
Ext Ref Nput Lnput Display Limits Range Voltage
S41.AC/DCRatioAccuracyTest
ExternalReferenceInputResistanceTest
45GPIB.0PEBATIONALCHECK0ption030
Lo v Ranse
It l l K o
PERFORMANCECHECKSModel3490A
1000kO range
+tll
Ii tti 1üj Li i l
Fä il Ir fli
Fj Fl
IiI
It I l L1,1ti
R * ! i t F T
Rf,lIr i5i 1.+ri
I i , Il
Powebsupplyadjustment
Procedures
Adjustment
$ 51 .ADJUSTMENTPROCEOURES
Dc standardhp- 7a0Bis requiredfor these
Model3490AAOJUSTMENTPROCEDURESSectionV
Dczeroadjustments
$57. Referenceadjustments
$66. Ohmmeteradjustments
69SAMPLE/HO.LDADJUSTMENTS
Dc standardhp- 7a0Bis requiredfor this
Model3490AADJUSTMENTPROCEDURESSectionV
73.0ffsetAdjustment
$75. DielectricAbsorptionAdjustment
Orrra
Aojustmentprocedures
Ratioreferenceadjustments
Lqe
ColTect
Adjustmentprocedures
Testrecord
Perfobmance
+ 1 2 . O O O
Performancetestbecordcontd
001v r 0.oo1v
LO.V l O V 1 0
00000v 10.üoo 12.0000v
Performancetestrecorocontd
50000v Ooooov 120000v
Ext Ret Fngu V 1 0
Proprietaryparts
Intboduction
Orderinginformation
NON.LISTEDPARTS
B l e 6 1 . R e p l o c e q b l eP o r t s
Otv
Reference HPPartNumber
Description Mfr Mfr PartNumber Designation Code
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\
Model
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
Oty
Reference
HP Part Numbel
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
28480 2a4AO
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@
Model 3490Ä
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?
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
DesignationReference HPPartNumber
DMT4LOON
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
Aoaroassyrehotejuxper
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
?5r-orlo
Oty
Cr r?21
CB a72l
2A480
Otv
Description Mfr Mfr PartNumber DesignationHPPartNumber Code
28aao
Orzo-oo+o
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
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
Description Mfr Mfr PartNumber Code
Reference HP Part Numbet otv
Designation
DrT4LOara
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
O O E B R E a K D O I I N
ModeI34904
T u 2 I l 5 u
AI3CR8
Cableribbon
R 2 r
Model Section
Caeleriaeon Ottgiitrdrei Isolatii Boardassy
Heiioi
A22API
A27RI
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
OBD
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
Z9cl 2 e c t 429C4 29C5
OHn 1trÄ 1/4W
A32RI
I I P 22K otr lot
I P l2K OHI lot
A3IU3
Mfr Code
Reference HPPartNumbet oty Description Designation
2A4AO 2S4AO
2211 2211 CB
A34YI
A39RA
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
T20/o
284r0 2a+ao 2A480 28480 2g4AO 284aO
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
Xo1
HPPartNumber
Description Mfr Mfr PartNumber
Reference
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
Reference HP Part Number Designation
OtvDescription
Mfr Code Mfr Part Number
Designator L M P l a MP1B M P l C MP1D MP2 MP3 MP4 MP5 MP6
SectionVI
MP37 MP23
MP7
29500043
318x32
Powersupplychecks
Pbeliminarytroubleshooting
ACCESSF0RSERVtCtNG
Troubleshootingtrees
DCAmplifierChecks
TableT-2. PowerSupplyJumperWires
13DC.ANAL0cCtRCUtTS
AZAsemblyExchange
I G G E R S C O P E a T a 1 T P K , + S L O P E
DCAmplifierSwitchingGircuits
Nlii
A N D 0 V L E V E L S O C C U R a T
21A. -to-C0NVERSt0ND CtBCUtTCHECKS
3I .INTEGRATOR Troubleshooting
33AC. Convebtertroubleshooting
37OHMS. Convertebtroubleshooting
Logictboubleshootingsuggestions
Displaytroubteshooting
Accesto Sample/HoldGircuits
65SAMPTE/HOLD.TROUBLESHOOTINGTREES
ExternalTriggerCircuitGheck
59SAMPLE/HOLD.SERVICING
O3490-27301
22000139
03490-006M
03490€6528
75SCHEMATIC.NOTES
RATIO.TBOUBLESHOOTING
AmplifierZerc0ffset
Truth Table
Logicgatesymbols
+ 5
Truth Table
Nrsc
SectionVII Model3490A AlphabeticalListingof 34g0A Mnemonics
U 4 o t
Alu401 Rexe
Guspb b l
Tl-l
= l
IaFeV-pF
Page
I1Lgji
+ Input
I1glil
Rtl7-r2
Iai ott *nn !drp6 ltnt. rync,+.1@
? 1 t 6 1 l 7 + T i + ?
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Ll?Qxl c207c2or
3ttr . n
YES
UiL
T E
Q208
Ratio INT
Q2O5 t1 swith
3 6 m s i 4
AITPK. +
0208
R317-1
O2or
0205
Q9e
+.JL
RaG
LfT
299A
See Notes
14,iä
Ffi
?rSlI
R7vl l
1s17-t6
Ov1--t==- -l6oms
LOomsF
Tlrtlt Wath AnDr
Llo
Rd 15 ot Altrt. JFuldbo+5V Lm r . tt
Tlrtlt Wath AnDr
Troubl .. hoor A7Ot ?CRIOüa ll
R7l7-r8
I l
#lsriieo,e*l
Eff#ri
Iub s!!h
T9lt
DisplayTroubleshootingTree
ITa --- it
L i l t l
T l
=LJ. L--l
NVW
Ru*rffifc
TEv
O 1 o
Page
Lirlt?lt..it \- toresh@rArur5 aIut1 J
3t,1
O24 oo24 @24 oo24 9032 oo24 t.o24 n 4 n2.4
Lop
+ 60O0.xxOL
Initiare 6 mre smples
Displaysholdread
+ 10.oo24
€@CI6@@e#ffi
Tl=l
S l . l
LDr s
S +
+ 5 n-s l r
+5 ms-l
Otuu U.T,J,l,,t-t
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2317-1
10. Logic Clock TroubleshootingTree
+ft$b!too
THttttffi
L sl \f -Jt +1 l
$E B?tr+1HHHLE r r r r r r r l
5 a
L- l l---,.l
Us-l Url
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Jtr2cr
Pulses
\ÄÄ
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+- zoomsl
Ea . f
Ti1i
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2s17-26
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Ffi
At7A2
NOI€S
Tlu2, a t1u3,Arl
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Th.-l
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Figare7-12.RemoteTroubleshootingTree,Option022 2717-28
RtN*16t12
+s-Yml
9 0 D- 3 3 8
Start
338r
Hffi3
Cauil oN . l
13. GPIBI/O TroubleshootingTree,Option030 2917-30
Hp Porl No O Rev . B
Port No V . C
Öl--.le
A27KI Shoulo 8€ CLOSED.SET SAM
Correcn
D a
SET S/H Sayitch to TFACK/HOLD
Main CIRC-IIT8OAFO. Shouloae
CABLESCORRECTLYGO. to
HOLD. M€ASURE Voltage AT
T3t17-32
Oft-.*l
9 0 D 3 4 3
To A2 X E
I,l
Hp Fort No -66527 Rev.B
Port No . O349O Rev . C
Tote
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Ffi.f-L
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73317-34
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P U T
LOW
EXT REF TPC
TPC A13CR6
P U T TPC
LOW
High
TPC
+ l 0
G H LOW G H LOW H I G H L O W
16. Ratio TroubleshootingTree
A33
A31 Rearof Instrument
A12 A17 A22 A11 3 or A36 A34 A35 A30
111
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I11
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Rö*et e J l
+++F+r@a
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CoKno
FP?fä
WüE,Ä,li
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Q l
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Overloadprotection
Hovpoverloaoprotectionh
A R D
A M P L I F I E R
Bootstrap P L I F I E R
T6azt
RuorerzV AA
\+l
Feedbackattenuator
? z e 1 2 z
Zl-----l
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Z r z l
391740
IRrr5- l .FrrBll- l Pt lP r f
9i czo1
@$Y@ Y 6ö Ff$$**H++
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1411742
Zero Detect
T7v- t7v CR202
Rblhb-l- --,1
Faq h-,,dn
Tf,rl
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?-rv
Ffie
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+REFERENCESUPPLY
V E R T I N G P L I F I E R
V E R T I N G
7431744
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F E R E N Cpeo L a R I T YL O C I C
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Ouiro
Regulator
TOAa
3OV Regulator
5117-s2
+ l 7 v Regulator
+3OV Regulator
Hp Port No.O349O-66503
REV . B
BCD
Polaritydisplay
Enable
Roaru4oreil
=i33SfTHr-+
Scan Decoder
Polaritydisplay Enable
U4,uro
A N N E R a T O R
Ra FE FA FB
Figwe 7-27. SchematicDiagram,Display, A3
Io*F
S3l7-s4
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Componentside
R C U I TS I D E
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Converteramplifier
Nc corvepreR ourPUT1
Figwe 7-29. SchematicDiagram,AC Converter,A6
S7l7-s
Filter
Drluod O6t9O-20999
Ofqlrod 06t90-O999-l
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Data Multiplexers
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74317-64
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COPYRIGHTt973 by Hewlett Packaro
Compa
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36.BlockDiagram,3490AGPIBVOCircuits 7117-72
N D
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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