HP 3478A User manual

TM 11-6625-3071-14TM 11-6625-3071-14
TECHNICAL MANUALTECHNICAL MANUAL
OPERATOR’S ORGANIZATIONAL, DIRECT SUPPORT,OPERATOR’S ORGANIZATIONAL, DIRECT SUPPORT,
AND GENERAL SUPPORT MAINTENANCE MANUALAND GENERAL SUPPORT MAINTENANCE MANUAL
DILGITAL MULTIMETERDILGITAL MULTIMETER
HEWLETT - PACKARD MODEL 3478AHEWLETT - PACKARD MODEL 3478A
HEADQUARTERS, DEPARTMENT OF THE ARMYHEADQUARTERS, DEPARTMENT OF THE ARMY
5 MARCH 19855 MARCH 1985

TM 11-6625-3071-14TM 11-6625-3071-14
AA

TM 11-6625-3071-14TM 11-6625-3071-14
hp-HEWLETThp-HEWLETT
PACKARDPACKARD
SAFETY SUMMARYSAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation, service, and repair ofThe following general safety precautions must be observed during all phases of operation, service, and repair of
this instrument Failure to comply with those precautions or with specific warnings elsewhere in this manualthis instrument Failure to comply with those precautions or with specific warnings elsewhere in this manual
violates safety standards of design, manufacture, and intended use of the instrument Hewlett Packard Companyviolates safety standards of design, manufacture, and intended use of the instrument Hewlett Packard Company
assumes no liability for the customer’s failure to comply with these requirements. This is a Safety Class 1assumes no liability for the customer’s failure to comply with these requirements. This is a Safety Class 1
instrumentinstrument
GROUND THE INSTRUMENTGROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. The instrumentTo minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. The instrument
is equipped with a three-conductor ac power cable. The power cable must either be plugged into an approved three-is equipped with a three-conductor ac power cable. The power cable must either be plugged into an approved three-
contact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmlycontact electrical outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly
connected to an electrical ground (safety ground) at the power outlet. The power jack and mating plug of theconnected to an electrical ground (safety ground) at the power outlet. The power jack and mating plug of the
power cable meet International Electrotechnical Commission (IEC) safety standards.power cable meet International Electrotechnical Commission (IEC) safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHEREDO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of flammable gases Do not operate the instrument in the presence of flammable gases
or fumes. Operation of or fumes. Operation of
any electrical instrument in suchany electrical instrument in such
an environment constitutes a definite safety hazard.an environment constitutes a definite safety hazard.
KEEP AWAY FROM LIVE CIRCUITSKEEP AWAY FROM LIVE CIRCUITS
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must beOperating personnel must not remove instrument covers. Component replacement and internal adjustments must be
made by qualified maintenance personnel. Do not replace components with power cable connected. Under certainmade by qualified maintenance personnel. Do not replace components with power cable connected. Under certain
conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect powerconditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power
and discharge circuits before touching them.and discharge circuits before touching them.
DO NOT SERVICE OR ADJUST ALONEDO NOT SERVICE OR ADJUST ALONE
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, isDo not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is
present.present.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENTDO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorizedBecause of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized
modification to the instrument. Return the instrument to a modification to the instrument. Return the instrument to a
Hewlett- Packard Sales and Service Office Hewlett- Packard Sales and Service Office
for service and repairfor service and repair
to ensure that safety features are maintained.to ensure that safety features are maintained.
DANGEROUS PROCEDURE WARNINGSDANGEROUS PROCEDURE WARNINGS
Warnings, such as the example below, precede potentially dangerous procedures throughout this manual. InstructionsWarnings, such as the example below, precede potentially dangerous procedures throughout this manual. Instructions
contained in the warnings must be followed.contained in the warnings must be followed.
Dangerous voltages, capable of causing death, are present in this Dangerous voltages, capable of causing death, are present in this
instrument Us ex-instrument Us ex-
treme caution when handling, testing, and adjusting.treme caution when handling, testing, and adjusting.
BB

TM 11-6625-3071-14TM 11-6625-3071-14
C/ (D BLANK)C/ (D BLANK)

TM 11-6625-3071-14TM 11-6625-3071-14
This manual contains copyright material reproduced by permission of the Hewlett-N Packard Company, Valley Forge, PAThis manual contains copyright material reproduced by permission of the Hewlett-N Packard Company, Valley Forge, PA
19482.19482.
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OPERATOR’S, ORGANIZATIONALOPERATOR’S, ORGANIZATIONAL
DIRECT SUPPORT, AND GENERAL SUPPORTDIRECT SUPPORT, AND GENERAL SUPPORT
MAINTENANCE MANUALMAINTENANCE MANUAL
DIGITAL MULTIMETER HP MODEL 3478ADIGITAL MULTIMETER HP MODEL 3478A
Serial Numbers: 2136A00101 and GreaterSerial Numbers: 2136A00101 and Greater
IMPORTANT NOTICEIMPORTANT NOTICE
If the Serial Number of your instrument is lower than the oneIf the Serial Number of your instrument is lower than the one
on this title page, the manual contains revisions that do noton this title page, the manual contains revisions that do not
apply to your instrument. Backdating information given inapply to your instrument. Backdating information given in
the manual adapts it to earlier instruments.the manual adapts it to earlier instruments.
Where practical, backdating information is integratedWhere practical, backdating information is integrated
intointo
the text, parts list and schematic diagrams. Backdatingthe text, parts list and schematic diagrams. Backdating
changes are denoted by a delta sign. An open delta (a) orchanges are denoted by a delta sign. An open delta (a) or
lettered delta (AA) on a given page, refers to thelettered delta (AA) on a given page, refers to the
corresponding backdating note on that page.corresponding backdating note on that page.
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTSREPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or ifYou can help improve this manual. If you find any mistakes or if
you know of a way to improve the procedures, please let usyou know of a way to improve the procedures, please let us
know. mail your letter, DA Form 2028 (recommended Changesknow. mail your letter, DA Form 2028 (recommended Changes
to Publications and Blank Forms), or DA Form 2028-2 located into Publications and Blank Forms), or DA Form 2028-2 located in
the back of this manual direct to: Commander, US Armythe back of this manual direct to: Commander, US Army
Communications-Electronics Command and Fort Monmouth,Communications-Electronics Command and Fort Monmouth,
ATTN: DRSEL-ME-MP, Fort Monmouth, NJ ATTN: DRSEL-ME-MP, Fort Monmouth, NJ
07703-5007.07703-5007.
In either case, a reply will be furnished direct to you.In either case, a reply will be furnished direct to you.
ii

TM 11-6625-3071-14TM 11-6625-3071-14
TABLE OF CONTENTSTABLE OF CONTENTS
Section PageSection Page
0.0.
 INTRODUCTION INTRODUCTION
0-1.0-1.
Scope Scope
................................
....................................
....................................
....................................
....................................
....................................
............................
................................
.....0-1.....0-1
0-2.0-2.
Consolidated Consolidated
Index Index
of of
Army Army
Publications Publications
and and
Blank Blank
FormsForms
....................
....................
....................
....................
....................
..........
....0-1....0-1
0-3.0-3.
Maintenance Maintenance
Forms, Forms,
Records, Records,
and and
ReportsReports
..................
..................
..................
..................
..................
..................
..................
..................
..............
....0-1....0-1
0-4.0-4.
Reporting Reporting
Equipment Equipment
Improvement Improvement
Recommendations Recommendations
(EIR)(EIR)
....................
....................
....................
......................
....................
....0-1....0-1
0-5.0-5.
AdministrAdministr
ative ative
StorageStorage
....................................
....................................
....................................
....................................
....................................
........................
..................
....0-1....0-1
0-6.0-6.
Destruction Destruction
of of
Army Army
Electronics Electronics
MaterielMateriel
..................
..................
..................
..................
..................
..................
..................
..................
..................
......
....0-1....0-1
iiii

TM 11-6625-3071-14TM 11-6625-3071-14
TABLE OF CONTENTSTABLE OF CONTENTS
Section PageSection Page
I.I.
GENERAL GENERAL
INFORMATIONINFORMATION
..................
..................
............
...1-1...1-1
1-1.1-1.
 Introduction................................... Introduction...................................
....1-1....1-1
1-3.1-3.
Section Section
I, I,
General General
Information.......Information.......
...1-1...1-1
1-5.1-5.
Section Section
II, II,
Installation Installation
ProceduresProcedures
..
...1-1...1-1
1-7.1-7.
Section Section
III, III,
Operation..................Operation..................
......
...1-1...1-1
1-9.1-9.
Section Section
IV, IV,
Performance Performance
Test Test
andand
CalibrationCalibration
1-11-1
1-11.1-11.
Section Section
V, V,
Replaceable Replaceable
Parts........Parts........
...1-1...1-1
1-13.1-13.
Section Section
VI, VI,
BackdatingBackdating
..................
..................
...1-1...1-1
1-15.1-15.
Section Section
VII, VII,
ServiceService
....................
....................
......
...1-1...1-1
1-17.1-17.
Appendix Appendix
AA
................
..................
..................
..................
..
...1-1...1-1
1-19.1-19.
 Description..................................... Description.....................................
...1-1...1-1
1-22.1-22.
 Specifications Specifications
................
..................
..................
..........
....1-1....1-1
1-24.1-24.
Instrument Instrument
and and
ManualManual
Identification...................................Identification...................................
...1-1...1-1
1-27.1-27.
OptionsOptions
..................
..................
..................
..................
..........
....1-2....1-2
1-29.1-29.
Accessories Accessories
Available.............Available.............
............
....1-2....1-2
Section PageSection Page
II.II.
INSTALLATIONINSTALLATION
..................
..................
..................
..................
..........
....2-1....2-1
2-1.2-1.
 Introduction................................... Introduction...................................
....2-1....2-1
2-3.2-3.
Initial Initial
Inspection..............Inspection..............
..................
..........
....2-1....2-1
2-5.2-5.
Power Power
RequirementsRequirements
..................
......................
....2-1....2-1
2-7.2-7.
Line Line
Frequency Frequency
and and
LineLine
Voltage Voltage
Selection...........Selection...........
..................
..............
...2-1...2-1
2-9.2-9.
Power Power
Cords Cords
and and
ReceptaclesReceptacles
..........
....2-2....2-2
2-11.2-11.
Grounding Grounding
RequirementsRequirements
....................
......
....2-1....2-1
2-13.2-13.
Bench Bench
Use Use
and and
Rack Rack
MountingMounting
........
....2-2....2-2
2-14.2-14.
Bench Bench
UseUse
................
..................
..................
..................
..
....2-2....2-2
2-16.2-16.
Rack Rack
Mounting.........Mounting.........
..................
..................
......
....2-3....2-3
2-18.2-18.
HP-IB HP-IB
Interface Interface
ConnectionsConnections
................
....2-3....2-3
2-21.2-21.
Address Address
Selection..........Selection..........
..................
............
....2-3....2-3
2-24.2-24.
Environmental Environmental
RequirementsRequirements
..............
....2-3....2-3
2-25.2-25.
Operating Operating
and and
StorageStorage
TemperatureTemperature
................
..................
..................
..............
....2-3....2-3
2-27.2-27.
Repackaging Repackaging
for for
ShipmentShipment
....................
..
....2-4....2-4
Section PageSection Page
III.III.
OPERATIONOPERATION
..................
..................
..................
..................
..................
....3-1....3-1
3-1.3-1.
 Introduction................................... Introduction...................................
....3-1....3-1
3-4.3-4.
General General
Information...........Information...........
..................
....
....3-1....3-1
3-5.3-5.
AC AC
Power Power
Operation.........Operation.........
..................
......
....3-1....3-1
3-7.3-7.
Turn-OnTurn-On
..................
..................
..................
..................
........
....3-1....3-1
3-10.3-10.
 Display.......................................... Display..........................................
....3-1....3-1
3-12.3-12.
Input Input
Terminals...............Terminals...............
..................
..........
....3-3....3-3
3-15.3-15.
Input Input
Terminals Terminals
Cleaning.............Cleaning.............
..
....3-3....3-3
3-17.3-17.
Front Front
Panel Panel
OperationOperation
......................
..............
....3-3....3-3
3-18.3-18.
DC DC
Volts Volts
Measurements.....Measurements.....
....................
....3-3....3-3
3-22.3-22.
AC AC
Volts Volts
Measurements............Measurements............
......
....3-4....3-4
3-26.3-26.
Resistance Resistance
MeasurementsMeasurements
....................
..
....3-4....3-4
3-30.3-30.
DC DC
Current Current
Measurements......Measurements......
..........
....3-5....3-5
3-34.3-34.
AC AC
Current Current
Measurements...........Measurements...........
....3-5....3-5
3-38.3-38.
RangingRanging
..................
..................
..................
..................
......
........
..
3-53-5
3-43.3-43.
TriggeringTriggering
..................
..................
..................
..................
..
....3-5....3-5
3-50.3-50.
Shifted Shifted
Operation.........Operation.........
..................
................
....3-6....3-6
3-51.3-51.
 General........................................ General........................................
........
..
3-63-6
3-54.3-54.
Number Number
of of
Digits Digits
Displayed...........Displayed...........
....
..
3-3-
66
3-57.3-57.
AutozeroAutozero
................
..................
..................
..................
........
....
....
3-73-7
3-60.3-60.
Self-Test/Reset Self-Test/Reset
Operation............Operation............
....
....
3-73-7
3-63.3-63.
CalibrationCalibration
................
..................
..................
..................
..
....
....
3-73-7
3-66.3-66.
Miscellaneous Miscellaneous
Operations............Operations............
....
....
3-83-8
3-67.3-67.
Voltmeter Voltmeter
Complete Complete
....................
....................
......
..
3-83-8
3-69.3-69.
Remote Remote
Operation.................Operation.................
..............
......
..
3-83-8
3-70.3-70.
 General......................................... General.........................................
....
....
3-83-8
3-74.3-74.
3478A 3478A
Response Response
to to
Bus Bus
MessageMessage
s.s.
33
--
88
3-92.3-92.
3478A 3478A
Addressing.................Addressing.................
..............
......
..
3-13-1
00
3-96.3-96.
Talk-Only Talk-Only
Mode Mode
(No (No
Controller)Controller)
........
....
..
3-13-1
00
3-98.3-98.
3478A 3478A
HP-IB HP-IB
Programming.........Programming.........
....
......
3-13-1
11
3-117.3-117.
Advanced Advanced
Programming.........Programming.........
..............
......
3-13-1
44
Section PageSection Page
IV.IV.
PERFORMANCE PERFORMANCE
TEST TEST
ANDAND
CALIBRATIONCALIBRATION
................
..................
..................
..................
................
....
..
4-4-
11
4-1.4-1.
 Introduction.................................... Introduction....................................
....
..
4-4-
11
4-4.4-4.
Equipment Equipment
Required.....Required.....
..................
................
....
..
4-4-
11
4-6.4-6.
DC DC
Volts Volts
Test Test
and and
CalibrationCalibration
..............
....
..
4-4-
11
4-10.4-10.
AC AC
Volts Volts
Test Test
and and
Calibration ...Calibration ...
......
....
..
4-4-
22
4-12.4-12.
Ohms Ohms
Test Test
and and
CalibrationCalibration
..................
..
....
....
4-4-
22
4-15.4-15.
DC DC
Current Current
Test Test
and and
Calibration...Calibration...
....
..
4-4-
33
4-20.4-20.
AC AC
Current Current
Test Test
and and
CalibrationCalibration
......
....
..
4-4-
33
4-24.4-24.
Test Test
CardsCards
....................................
....................................
....
....
4-4-
33
4-26.4-26.
Calibration Calibration
CycleCycle
................
..................
..................
..
....
..
4-4-
33
4-28.4-28.
Test Test
Failure Failure
....................................
................................
....
..
4-4-
33
4-30.4-30.
Instrument Instrument
Set-UpSet-Up
..................
..................
............
......
..
4-34-3
4-32.4-32.
Instrument Instrument
SpecificationSpecification
..................
..............
....
..
4-4-
33
4-35.4-35.
Specification Specification
Breakdown Breakdown
......................
......
....
..
4-4-
44
4-39.4-39.
Temperature Temperature
CoefficientCoefficient
(Reference (Reference
Temperature)Temperature)
..................
........
....
..
4-4-
44
4-41.4-41.
Test Test
ConsiderationConsideration
................
..................
............
......
..
4-44-4
4-42.4-42.
 General......................................... General.........................................
....
....
4-44-4
4-44.4-44.
Ambiguous Ambiguous
RegionRegion
....................
....................
......
......
..
4-44-4
4-47.4-47.
Performance Performance
Test............Test............
..................
........
......
..
4-54-5
4-49.4-49.
DC DC
Volts Volts
TestTest
..................
..................
..................
........
....
....
4-54-5
4-54.4-54.
DC DC
Current Current
TestTest
................
..................
..................
..
......
..
4-74-7
4-59.4-59.
AC AC
Volts Volts
TestTest
..................
..................
..................
........
....
....
4-84-8
4-64.4-64.
AC AC
Current Current
TestTest
................
..................
..................
....
....
..
4-4-
99
4-69.4-69.
Ohms Ohms
Test.4-Test.4-
1010
......................................................
......
..
4-14-1
00
4-76.4-76.
Combined Combined
Calibration Calibration
andand
Performance Performance
TestsTests
..................
..................
............
......
4-14-1
11
4-77.4-77.
 General......................................... General.........................................
....
....
4-14-1
11
4-80.4-80.
Calibrating Calibrating
the the
3478A..............3478A..............
............
....
..
4-14-1
22
4-82.4-82.
Calibration Calibration
Messages............Messages............
..............
......
..
4-14-1
33
4-84.4-84.
Calibration Calibration
Procedures............Procedures............
..........
......
..
4-14-1
33
4-86.4-86.
DC DC
Volts Volts
Calibration Calibration
and and
TestTest
..............
......
4-14-1
33
4-90.4-90.
DC DC
Current Current
Calibration Calibration
and and
Test...Test...
......
4-14-1
55
4-94.4-94.
AC AC
Volts Volts
Calibration Calibration
and and
TestTest
..............
......
4-14-1
66
4-99.4-99.
AC AC
Current Current
Calibration Calibration
andand
Test Test
(Optional............(Optional............
..................
..................
......
.. ..
4-4-
1818
4-103.4-103.
Ohms Calibration Ohms Calibration
and Testand Test
..................
....
......
4-14-1
88
iiiiii

TM 11-6625-3071-14TM 11-6625-3071-14
TABLE OF CONTENTS (TABLE OF CONTENTS (
Cont’d)Cont’d)
Section PageSection Page
V.V.
REPLACEABLE REPLACEABLE
PARTS............PARTS............
..................
............
....5-1....5-1
5-15-1
..
IntrIntr
oductoduct
ion.......ion.......
........
........
........
........
........
........
........
........
........
........
..
....5-1....5-1
5-45-4
..
OrderOrder
ing Informaing Informa
tion...tion...
........
........
........
........
........
........
........
........
...5-1...5-1
5-6.5-6.
Non-Listed Non-Listed
PartsParts
................
..................
..................
..................
..........
....5-1....5-1
5-8.5-8.
Parts Changed...........................................Parts Changed...........................................
....5-1....5-1
5-10.5-10.
Propriety Propriety
PartsParts
................
..................
..................
..................
..................
...5-1...5-1
5-12.5-12.
3478a 3478a
Disassembly Procedure.................Disassembly Procedure.................
..
....5-2....5-2
Section PageSection Page
VI.VI.
BACKDATINGBACKDATING
..................
..................
..................
..................
..............
....6-1....6-1
6-1.6-1.
 Introduction................................... Introduction...................................
....6-1....6-1
Section PageSection Page
VII.VII.
SERVICESERVICE
................
..................
..................
..................
..................
..............
....7-1....7-1
7-17-1
..
IntrIntr
oductoduct
ion.......ion.......
........
........
........
........
........
........
........
........
........
........
..
....7-1....7-1
7-3.7-3.
Safety Safety
ConsiderationConsideration
................
..................
..................
..............
....7-1....7-1
7-8.7-8.
Recommended Test EquipmentRecommended Test Equipment
7-10.7-10.
Miscellaneous Miscellaneous
Information...............Information...............
....................
..
...7-1...7-1
7-11.7-11.
Instrument DisassemblyInstrument Disassembly
(PC (PC
Board Board
Replacement)Replacement)
..................
..................
..................
................
....
...7-1...7-1
7-13.7-13.
Fuse Fuse
ReplacementReplacement
..................
..................
..................
..................
....7-1....7-1
Section PageSection Page
7-15.7-15.
Troubleshooting.........................................Troubleshooting.........................................
....7-2....7-2
7-16.7-16.
Introduction................................................Introduction................................................
....7-2....7-2
7-18.7-18.
3478A Self-Test.........................................3478A Self-Test.........................................
....7-2....7-2
7-27.7-27.
Service Service
Group Group
Selection........Selection........
................
................
........
....7-2....7-2
Service Service
GroupsGroups
................
..................
..................
..................
..................
........Page........Page
AA
DC Volts and DC CurrentDC Volts and DC Current
TroubleshootingTroubleshooting
..................
..................
..................
..............
......
..
7-A7-A
-1-1
BB
AC Volts and AC CurrentAC Volts and AC Current
TroubleshootingTroubleshooting
..................
..................
..................
..............
......
7-B7-B
-1-1
CC
Ohms Ohms
Troubleshooting...............Troubleshooting...............
..................
......
........
7-C-7-C-
11
DD
A/D Converter and LogicA/D Converter and Logic
TroubleshootingTroubleshooting
..................
..................
..................
................
......
7-D-7-D-
11
EE
Power Supplies and ReferencePower Supplies and Reference
TroubleshootingTroubleshooting
..................
..................
..................
..............
......
7-E7-E
-1-1
FF
Theory of Theory of
OperationOperation
..................
..................
..................
..........
....7-F-1....7-F-1
Schematics...........Schematics...........
..................
..................
............
........
7-G-7-G-
1/1/
7-G-27-G-2
APPENDIX A...APPENDIX A...
................................................................................................
....
..
A-A-
11
B.B.
ReferencesReferences
................
..................
..................
..................
..
....
..
B-B-
11
C.C.
Components Components
of of
End End
ItemItem
List.................................................List.................................................
....
..
C-C-
11
D.D.
Additional Additional
AuthorizationAuthorization
List(Not Application:)List(Not Application:)
E. E.
Maintenance Maintenance
AllocationAllocation
......................
..................
E-1E-1
F. F.
Expendable Expendable
Supplies Supplies
andand
Material List(N/A)Material List(N/A)
LISTLIST
OO
FF
TABLESTABLES
Tables PageTables Page
3-13-1
..
ShiftShift
ed Operaed Opera
tions.....tions.....
........
........
........
........
........
........
........
......
..
....3-6....3-6
3-2.3-2.
3478A 3478A
Error Error
Messages...............Messages...............
..................
............
....3-7....3-7
3-3.3-3.
3478A 3478A
Bus Bus
Capabilities.....Capabilities.....
..................
..................
..............
....3-8....3-8
3-43-4
..
StatuStatu
s Byte Definits Byte Definit
ionsions
........
........
........
........
........
........
........
........
...3-10...3-10
3-5.3-5.
3478A 3478A
Address Address
Codes...........Codes...........
..................
..................
......
...3-11...3-11
3-6.3-6.
3478A Program 3478A Program
CodesCodes
..................
..................
..................
......
....3-12....3-12
3-73-7
..
Binary Binary
StatStat
us us
Byte Byte
DefinDefin
ition.......ition.......
........
........
........
......
...3-14...3-14
4-14-1
..
AbbAbb
revrev
iatiat
ed ed
SpeSpe
cifcif
icaica
tiotio
ns Tablens Table
......
......
......
......
....
..
...4-1...4-1
4-2.4-2.
Recommended Test EquipmentRecommended Test Equipment
....................
............
....4-2....4-2
4-3.4-3.
DC Volts DC Volts
Test LimitsTest Limits
................
..................
..................
................
....4-5....4-5
4-44-4
..
DC CDC C
urrenurren
t Tet Te
st st
LimitLimit
ss
........
........
........
........
........
........
........
....
....4-7....4-7
4-54-5
..
AC AC
Volts Volts
Test Test
LimitLimit
ss
........
........
........
........
........
........
........
........
....
....4-8....4-8
4-64-6
..
AC AC
CurreCurre
nt nt
Test Test
LimitLimit
ss
........
........
........
........
........
........
........
......
...4-9...4-9
4-7.4-7.
Ohms Test LimitsOhms Test Limits
..................
..................
..................
..................
....
....4-10....4-10
Tables PageTables Page
4-84-8
..
DC DC
Volts Volts
CalibrCalibr
ation ation
and and
Test.....Test.....
........
........
........
......
....
..
4-14-1
33
4-94-9
..
DC CurDC Cur
renren
t Calibt Calib
ratrat
ion and Teion and Te
st....st....
......
....
......
....
....
......
4-14-1
55
4-10.4-10.
AC Volts Calibration and TestAC Volts Calibration and Test
....................
....................
....
..
4-14-1
77
4-11.4-11.
AC Current Calibration and TestAC Current Calibration and Test
..................
..............
......
4-14-1
88
4-12.4-12.
Ohms Calibration and TesOhms Calibration and Tes
tt
....................
....................
........
......
4-14-1
99
5-15-1
..
StanStan
dard dard
AbbreAbbre
viativiati
ons......ons......
........
........
........
........
........
........
....
..
5-5-
11
5-25-2
..
Code Code
List List
of of
ManuManu
factufactu
rersrers
........
........
........
........
........
........
....
..
5-5-
22
5-3.5-3.
Replaceable Parts ListReplaceable Parts List
..................
..................
..................
......
......
..
5-35-3
5-4.5-4.
3478A Mechanical and3478A Mechanical and
Miscellaneous Miscellaneous
PartsParts
..................
..................
..................
................
....
..
5-5-
99
7-17-1
..
3478A 3478A
ServServ
ice ice
GroupGroup
s s
........
........
........
........
........
........
........
..
......
..
7-27-2
7-F-1.7-F-1.
Ohms Current and Ranges Ohms Current and Ranges
..................
......................
......
......
7-F7-F
-7-7
7-F-2.7-F-2.
AC AC
AmplifiAmplifi
er .....................er .....................
....................................
............
....
..
7-F7-F
-9-9
A-1.A-1.
3478A 3478A
Device Device
Capability ....Capability ....
....................
....................
....
......
..
A-3A-3
A-2.A-2.
HP-IB HP-IB
WorksheetWorksheet
................
..................
..................
..................
......
......
..
A-4A-4
iviv

TM 11-6625-3071-14TM 11-6625-3071-14
LIST OFLIST OF
ILLUSTRATIONSILLUSTRATIONS
Figure PageFigure Page
2-1.2-1.
Line Line
Frequency Frequency
Switch Switch
....................
............
....
....
2-12-1
2-2.2-2.
Line Line
Select Select
Jumper Jumper
................
..................
..........
......
..
2-22-2
2-3.2-3.
Power Power
Cords Cords
....................................
............................
......
..
2-22-2
2-4.2-4.
Typical Typical
HP-IB HP-IB
SystemSystem
Interconnection .............................Interconnection .............................
....
..
2-32-3
2-5.2-5.
HP-IB HP-IB
ConnectoConnecto
r r
....................................
..............
......
..
2-42-4
2-6.2-6.
3478A 3478A
Address Address
Switch Switch
..................
................
......
..
2-42-4
3-1.3-1.
3478A 3478A
Front Front
and and
Rear Rear
PanelPanel
Features ......................................Features ......................................
....3-2....3-2
3-2.3-2.
Typical Typical
Input Input
MeasurementMeasurement
Connection ....................................Connection ....................................
....
..
3-33-3
3-3.3-3.
Typical Typical
Current Current
MeasurementMeasurement
Connection ....................................Connection ....................................
....
..
3-33-3
3-4.3-4.
Ohms Ohms
Connections Connections
................
..................
..........
......
..
3-43-4
3-5.3-5.
Autoranging Autoranging
Points Points
................
..................
..........
......
..
3-63-6
3-6.3-6.
Status Status
Byte Byte
................................
..................................
......
..
3-93-9
4-1.4-1.
Ambiguous Ambiguous
Regions Regions
..................
......................
......
..
4-44-4
4-2.4-2.
DC DC
Volts Volts
Accuracy Accuracy
TestTest
and Calibration ..............................and Calibration ..............................
....
..
4-64-6
4-3.4-3.
DC DC
Common Common
Mode Mode
Rejection Rejection
TesTes
t...4-7t...4-7
4-4.4-4.
DC DC
Current Current
Accuracy Accuracy
TestTest
and Calibration ..............................and Calibration ..............................
....
..
4-84-8
4-5.4-5.
AC AC
Current Current
Accuracy Accuracy
TestTest
and Calibration ..............................and Calibration ..............................
....
..
4-14-1
00
4-6.4-6.
4-Wire 4-Wire
Ohms Ohms
Short Short
....................................
........
........
4-114-11
4-7.4-7.
4-Wire 4-Wire
Ohms Ohms
Connection Connection
..................
......
........
4-114-11
5-1.5-1.
3478A 3478A
Front Front
Panel Panel
ViewView
5-9/5-105-9/5-10
5-2.5-2.
3478A 3478A
Rear Rear
Panel Panel
ViewView
5-9/5-105-9/5-10
5-3.5-3.
3478A 3478A
Bottom Bottom
ViewView
..
5-9/5-105-9/5-10
5-4.5-4.
3478A 3478A
Left Left
Side Side
ViewView
5-9/5-105-9/5-10
5-5.5-5.
Bottom Bottom
View View
WithWith
Cover Removed ............................Cover Removed ............................
....
..
5-15-1
11
5-6.5-6.
Top Top
View View
WithWith
Cover Removed.............................Cover Removed.............................
....
..
5-15-1
11
5-7.5-7.
Front Front
Panel Panel
Bracket Bracket
View View
..................
........
...5-11...5-11
5-8.5-8.
Front Front
Panel Panel
Assembly Assembly
......................
................
...5-11...5-11
7-A-17-A-1
..
JM4JM4
03 SA Con03 SA Con
necnec
tiotio
n n
......
......
......
......
....
......
........
7-A-7-A-
44
7-B-1.7-B-1.
JM403 JM403
SA SA
Connection Connection
....................
..............
........
7-B-27-B-2
7-C-17-C-1
..
JM40JM40
3 3
SA SA
ConneConne
ctionction
. .... ...
........
........
........
....
......
7-C-7-C-
44
7-D-1.7-D-1.
US01 US01
ALE ALE
Signal ........Signal ........
..................
..................
......
7-D-7-D-
22
7-D-27-D-2
..
FlowchFlowch
art Aart A
........
........
........
........
........
........
........
........
........
......
7-D-7-D-
33
Figure PageFigure Page
7-D-3.7-D-3.
Flowchart Flowchart
BB
..................
..................
..................
................
......
7-D7-D
-5-5
7-D-4.7-D-4.
FlowchaFlowcha
rt rt
C C
....................................
................................
......
7-D7-D
-6-6
7-D-5.7-D-5.
U462 U462
ALE ALE
Signal Signal
..................
..................
................
....
..
7-D7-D
-8-8
7-D-6.7-D-6.
FlowchaFlowcha
rt rt
D D
....................................
................................
......
7-D7-D
-9-9
7-D-7.7-D-7.
JM403 JM403
SA SA
Connection......Connection......
....................
....
...7-D-10...7-D-10
7-F-1.7-F-1.
3478A 3478A
Simplified Simplified
BlockBlock
Diagram .......................................Diagram .......................................
......
..
7-F7-F
-2-2
7-F-2.7-F-2.
Simplified Simplified
Schematic Schematic
of of
thethe
Input Switching Circuitry Input Switching Circuitry
....................
..........
......
7-F7-F
-4-4
7-F-3.7-F-3.
Simplified Simplified
Schematic Schematic
of of
thethe
DC/Ohms InpuDC/Ohms Inpu
t Amplifier t Amplifier
..................
........
......
7-F7-F
-6-6
7-F-4.7-F-4.
Ohms Ohms
Circuitry Circuitry
Configuration Configuration
................
....
7-7-
F-F-
66
7-F-5.7-F-5.
AC AC
Gain Gain
Configurations Configurations
..................
..............
......
7-F7-F
-8-8
7-F-6.7-F-6.
Dual Dual
Slope Slope
Conversion Conversion
......................
............
......
7-F7-F
-9-9
7-F-7.7-F-7.
Simplified Simplified
A/D A/D
Converter Converter
......................
..
....
7-F-7-F-
1010
7-F-8.7-F-8.
Integrator Integrator
(U401) (U401)
OutputOutput
Slopes ......................................Slopes ......................................
....7-F-10....7-F-10
7-F-9.7-F-9.
Runup Runup
SlopesSlopes
(4 1/2 Digit Model) (4 1/2 Digit Model)
....................
....................
....
....
7-F-17-F-1
11
7-F-10. Runup Slopes For Zero Inputs7-F-10. Runup Slopes For Zero Inputs
4 4
1/2 1/2
Model) Model)
................................
............................
......
7-F-7-F-
1212
7-F-11.7-F-11.
Slope Slope
S S
+ +
4 4
Generation Generation
..................
........
......
7-F-7-F-
1212
7-F-12.7-F-12.
Slope Slope
S S
- -
4 4
Generation Generation
......................
......
......
7-F-7-F-
1212
7-F-13.7-F-13.
Slope Slope
S+0 S+0
and and
S-0S-0
Generation ................................Generation ................................
....7-F-13....7-F-13
7-F-14.7-F-14.
Rundown Rundown
Slopes Slopes
....................
......................
..
....7-F-13....7-F-13
7-F-15.7-F-15.
Determining Determining
the the
DAC DAC
Setting Setting
........
......
7-F-17-F-1
55
7-F-16.7-F-16.
A/D A/D
Hybrid Hybrid
(U403) (U403)
....................
....................
....
....
7-F-17-F-1
55
7-F-17.7-F-17.
3478A 3478A
Simplified Simplified
ReferenceReference
Circuitry .....................................Circuitry .....................................
......
7-F-7-F-
1616
7-F-18.7-F-18.
Power-On Power-On
Circuitry Circuitry
....................
....................
......
7-F-17-F-1
77
7-F-19.7-F-19.
Reset Reset
CircuiCircui
try try
....................................
..................
......
7-F-7-F-
1818
7-G-1.7-G-1.
General General
Schematic Schematic
Notes Notes
....................
....
......
7-G7-G
-1-1
7-G-2.7-G-2.
3478A 3478A
Block Block
Diagram Diagram
....................
................
......
7-G7-G
-3-3
7-G-3.7-G-3.
Input Input
Circuitry Circuitry
andand
Ohms Current SourceOhms Current Source
7-G-5/7-G-67-G-5/7-G-6
7-G-4.7-G-4.
AC AC
to to
DC DC
Converter Converter
....................
....................
..
....
..
7-G7-G
-7-7
7-G-5.7-G-5.
A/D A/D
Converter Converter
andand
Control Logic Control Logic
....................
..................
......
7-G-97-G-9
/7-G/7-G
-10-10
7-G-6.7-G-6.
Power Power
Supplies Supplies
..................
......
......
7-G-11/7-G-127-G-11/7-G-12
A-1.A-1.
Interface Interface
Connection Connection
andand
Bus Structure............................Bus Structure............................
....
..
A-A-
22
vv

TM 11-6625-3071-14TM 11-6625-3071-14
SECTION 0SECTION 0
INTRODUCTIONINTRODUCTION
00
--
11
..
SS
CC
OO
PP
EE
This manual describes the This manual describes the
Digital Multimeter, HP Model 3478A and Digital Multimeter, HP Model 3478A and
provides instructions for operation and maintenance.provides instructions for operation and maintenance.
0-0-
2.2.
COCO
NSNS
OLOL
IDID
ATAT
ED IED I
NDND
EX OEX O
F ARF AR
MY PMY P
UBUB
LILI
CACA
TITI
ONON
S AND BS AND B
LALA
NK FNK F
OROR
MSMS
Refer to the latest issue of DA Refer to the latest issue of DA
Pam 310-1 to determine whether there are new editions, changes or Pam 310-1 to determine whether there are new editions, changes or
additional publicationsadditional publications
pertaining to the equipment.pertaining to the equipment.
0-0-
3.3.
MAMA
ININ
TETE
NANA
NCNC
E FOE FO
RMRM
S, RS, R
ECEC
OROR
DSDS
, AN, AN
D RED RE
POPO
RTRT
SS
a.a.
ReporRepor
ts of Maintets of Mainte
nance and Unnance and Un
satisfsatisf
actoractor
y Equipy Equip
ment. Depment. Dep
artmeartme
nt of the Army forms and procent of the Army forms and proce
dures used fordures used for
equipment maintenance will be those prescribed by DA Pam 738-750, as contained in Maintenance Managementequipment maintenance will be those prescribed by DA Pam 738-750, as contained in Maintenance Management
Update.Update.
b.b.
ReporRepor
t of Packagit of Packagi
ng and Hanng and Han
dling Dedling De
ficienficien
cies. Filcies. Fil
l out and forwl out and forw
ard SF 364 (Repoard SF 364 (Repo
rt of Discreprt of Discrep
ancy (Rancy (R
OD)) asOD)) as
prescribed in AR 735-11-2/DLAR 4140.55/ NAVMATINST 4355.73A/AFR 400-54/MCO 4430.3F.prescribed in AR 735-11-2/DLAR 4140.55/ NAVMATINST 4355.73A/AFR 400-54/MCO 4430.3F.
c.c.
DiscreDiscre
pancy ipancy i
n Shipment Ren Shipment Re
port (DIport (DI
SREP)SREP)
(SF 361)(SF 361)
. Fill out and forwa. Fill out and forwa
rd Discreprd Discrep
ancy in Shipmancy in Shipm
ent Reporent Repor
tt
(DISREP)(SF 361) as prescribed in AR 55-38/ NAVSUPINST 4610.33C/AFR 75-18/MCO P4610.19D/DLAR(DISREP)(SF 361) as prescribed in AR 55-38/ NAVSUPINST 4610.33C/AFR 75-18/MCO P4610.19D/DLAR
4500.15.4500.15.
0-0-
4.4.
RERE
POPO
RTRT
ININ
G EQUIG EQUI
PMPM
ENEN
T IMPT IMP
RORO
VEVE
MEME
NT RECNT REC
OMOM
MEME
NDND
ATAT
IOIO
NS (EINS (EI
R)R)
If your equipment needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us whatIf your equipment needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what
you don’t like about your equipment. Let us know why you don’t like the design. Put it on an SF 368 (Quality Deficiencyyou don’t like about your equipment. Let us know why you don’t like the design. Put it on an SF 368 (Quality Deficiency
Report). Mail it to Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTReport). Mail it to Commander, US Army Communications-Electronics Command and Fort Monmouth, ATT
N: DRSEL-ME-N: DRSEL-ME-
MP, Fort Monmouth, NJ 07703-5007. We’ll send you a reply.MP, Fort Monmouth, NJ 07703-5007. We’ll send you a reply.
00
--
55
..
AA
DD
MM
II
NN
II
SS
TT
RR
AA
TT
II
VV
E STE ST
OO
RR
AA
GG
EE
Administrative storage of equipment issued to and used by Army activities will have preventive maintenance performed inAdministrative storage of equipment issued to and used by Army activities will have preventive maintenance performed in
accordance with the PMCS charts for storing. When removing the equipment from administrative storage the PMCSaccordance with the PMCS charts for storing. When removing the equipment from administrative storage the PMCS
should be performed to assure operational readiness. Disassembly and repacking of equipment for shipment or limitedshould be performed to assure operational readiness. Disassembly and repacking of equipment for shipment or limited
storage is covered instorage is covered in
paragraph 2-27.paragraph 2-27.
0-0-
6.6.
DEDE
STST
RURU
CTCT
IOIO
N N
OF OF
ARAR
MY MY
ELEL
ECEC
TRTR
ONON
ICIC
S S
MAMA
TETE
RIRI
ELEL
Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.
0-10-1