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@
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Page
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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* @@@@@@@@@@@@
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i'a;|"*;,,ilJ**io**l.Io,l
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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