HP 3455A Service manual

OPERATING AND SERVICE MANUAL
DIGITAL
VOLTMETER
3455A
HEWLETT
PACKARD
-hp-
3455A

HEWLETT
PACKARD
OPERATING AND SERVICE MANUAL
MODEL 3455A
DIGITAL VOLTMETER
Serial Numbers: 1622A00I01 and Greater
IMPORTANT NOTICE
This loose leaf manual does not normally require achange sheet. All
major charrge information has been integrated into the manual by
page revision. In cases where only minor changes are required, 8
change sheet rnay be suttplied.
If the Serial Number of your instrument Is lower than the one on
this title page, the manual contains revisions that do not apply to
your Instrument. Backdatirtg information given in the manual adapts
it to earlier instruments,
Where practical, backdating Information Is Integrated into the text,
parts list and schematic diagrams. Backdating changes are denoted
by adelta sign. An open delta (A) or lettered delta (A^) on agiven
page, refers to the corresponding backdating note on that page.
Backdating changes not integrated into the manual are denoted by
anumbered delta <At Iwhich refers to the corresponding change in
the Backdatirtg section (Section VIO.
To help minimize the possibility of electrics! fire or shock
hazards, do not expose this instrument to rain or excessive
moisture.
Mtnual Part No. 03455-90003
Microfiche Part No. 03455-90053
(DCopyright Hewlett-Packard Company 1976
P.O. Box 301, Loveland, Colorado, 80537 U.S.A.
Printed: July 1979

Who\ HEWLETT
%LfiM PACKARD
CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifications at the time ofshipment from the
factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United Slates Ha-
lional Bureau ofStandards, to the extent allowed by the Bureau 's calibration facility, and to the calibration facilities
of other International Standards Organization members.
WARRANTY
This Hewlett-Packard product is warranted against defects in material and workmanship for aperiod of one year
from date of shipment (.except that in the case of certain components listed in Section Iof this manual, the warranty
shall be for the specified period] .During the warranty period, Hewlett-Packard Company will, at its option, either
repair or replace products which prove to be defective.
For warranty service or repair, this product must be returned to aservice facility designated by -hp-. Buyer shall
prepay shipping charges to -hp- and -hp- shall pay shipping charges to return the product to Buyer. However, Buyer
shall pay all shipping charges, duties, and taxes for products returned to -hp- from another country.
Hewlett-Packard warrants that its software and firmware designated by -hp- for use with an instrument will execute its
programming instructions when properly installed on that instrument. Hewlett-Packard does not warrant that the
operation of the instrument, or software, or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer,
Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HEWLETT-PACKARD SPECIFICALLY
DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR APARTICULAR
PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES. HEWLETT-
PACKARD SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT. SPECIAL. INCIDENTAL. OR CONSE-
QUENTIAL DAMAGES. WHETHER BASED ON CONTRACT. TORT. OR ANY OTHER LEGAL THEORY.
ASSISTANCE
Product maintenance agreements and other customer assistance agreements are available
for Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Office.
Addresses are provided at the back of this manual.
10/1/7*

Model 3455A Table of Contents
TABLE OF CONTENTS
Section Page
I. GENERAL INFORMATION 1-1
1-1. Introduction 1-1
1-5. Specifications 1-1
1-7. Instrument and Manual Identification ...I-l
1-11. Description 1-1
1-13. Options 1-1
1-15. Accessories Supplied 1-1
1-17. Accessories Available 1-1
1-19. Recommended Test Equipment 1-1
Section Page
II. INSTALLATION 2-1
2-1. Introduction 2-1
2-3. Initial Inspection 2-1
2-5. Preparation for Use 2-1
2-6. Power Requirements 2-1
2-8. Line Voltage Selection 2-1
2-10. Power Cable 2-1
2-12. Grounding Requirements 2-1
2-14. Bench Use 2-1
2-16. Rack Mounting 2-2
2-18. Interface Connections 2-2
2-22. Environmental Requirements 2-2
2-23. Operating and Storage Temperature. ..2-2
2-26. Humidity 2-3
2-28. Altitude 2-3
2-
30. Repackaging for Shipment 2-3
Section Page
111 OPERATING INSTRUCTIONS 3-1
3-
1. Introduction 3-1
3-3. Operating Characteristics 3-1
3-4. Turn-On and Warm-Up 3-1
3-6. Self-Test Operation 3-1
3-10. DC Voltage Measurement 3-1
3-12. Resistance Measurement 3-2
3-14. AC Voltage Measurement 3-2
3-19. Math Feature 3-3
3-23. Enter and Store 3-4
3-27. High Resolution Mode 3-4
3-29. Auto-Cal 3-5
3-33. Trigger 3-5
3-36. Sample Rate 3-5
3-38. Auto Range 3-6
3-41. Guarding 3-6
3-42. Common-Mode Voltages 3-6
3-44. Guard Connection 3-6
3-46. Guarding Information 3-6
3-48. Remote Operation 3-7
3-49. General 3-7
3-53. Address Selection 3-7
3-56. Program Codes 3-8
3-61. Data Messages 3-9
3-69. Device Control Messages 3-12
3-78. Interrupt and Device Status
Messages 3-12
3-82. Data Output Characteristic 3-13
3-84. Bail Out Message 3-13
3-86. Instrument Measurement Times
(Remote Control) 3-13
3-88. Remote Programming Examples 3-14
3-90. Operators Checks 3-14
3-92. Bench Use 3-14
3-
94. HP-IB Operation 3-14
Section Page
IV. PERFORMANCE TESTS 4-1
4-
1. Introduction 4-1
4-3. Equipment Required 4-1
4-5. Performance Test Card 4-1
4-7. Calibration Cycle 4-1
4-9. Input Terminals/Control Settings 4-1
4-11. Performance Test Failure 4-1
4-13. Specification Breakdown 4-1
4-17. I>C Accuracy Test Considerations 4-2
4-26. Operational Verification Tests 4-3
4-27. DC Operational Accuracy Test 4-3
4-30. Test Procedure 4-3
4-31. AC Operational Accuracy Test 4-5
4-34. Test Procedure 4-5
4-35. Ohmmeter Accuracy Test 4-8
4-37. Test Procedure 4-8
4-38. DC Voltmeter Input Resistance Test. ...4-9
4-39. Performance Test 4-9
4-40. DC Voltmeter Accuracy Test 4-9
4-43. Test Procedure 4-10
4-44. CVoltmeter Accuracy Test 4-12
4-47. Test Procedure 4-12
4-48. Ohmmeter Accuracy Test 4-16
4-50. Test Procedure 4-16
4-51. Common-Mode and Normal-Mode
Rejection Test 4-17
4-54. Test Procedure 4-17
4-55. DC Voltmeter Input Resistance
Test 4-18
4-
56. AC Voltmeter Input Impedance
Test 4-19/4-20
Section Page
V. ADJUSTMENTS 5-1
5-
1. Introduction 5-1
5-3. Equipment Required 5-1
5-5. Adjustment Interval 5-1
5-7. Adjustment Sequence .5-1
5-9. Test Point and Adjustment Locations. ..5-1
5-11. DC Zero Adjustments 5-1
5-12. DC and Ohms Reference Adjustments. ..5-2
5-14. Adjustment Procedure 5-2
5-15. RMS Convertor Adjustments
(Standard Model 3455A Only) 5-3
5-16. Average Convertor Adjustments
(345SA Option 001 Only) 5-4
5-18. Adjustment Procedure 5-4
iii

Table of Contents Model 3455A
TABLE OF CONTENTS (Cont'd)
Section Page
VI. REPLACEABLE PARTS 6-1
6-1. Introduction 6-1
6-4. Ordering Information 6-1
6-6. Non-Listed Parts 6-1
6-8. Parts Changes 6-1
6-10. Proprietary Parts 6-1
6-12. Exchange Assemblies 6-2
6-
15. Service Kit 6-2
Section Page
VII. MANUAL CHANGES 7-1
7-
1. Introduction 7-1
Section Page
VIII. SERVICE 8-1
8-
1Introduction 8-1
8-3. Safety Considerations
8-8. Recommended Test Equipment 8-1
8-10. Introduction 8-2
8-12. Input Switching and DC Attenuator. ..8-2
8-13. General 8-2
8-15. Detailed Description 8-2
8-17. Operational Attenuator 8-2
8-19. Auto Calibration-DC Voltage 8-2
8-20. General 8-2
8-22. Circuit Description 8-4
8-34. Auto-Calibration-Ohms 8-9
8-35. General 8-9
8-37. Circuit Description 8-9
8-42. Auto Calibration-A/D Convertor. ...8-10
8-44. Circuit Description 8-11
8-47. True RMS AC Convertor 8-11
8-48. General 8-11
8-50. Circuit Description 8-11
8-56. Average Responding AC Convertor
(Option 001) 8-12
8-57. General 8-12
8-59. Circuit Description 8-12
8-65. Ohms Convertor 8-13
8-66. General 8-13
8-68. General Description 8-13
8-73. DC Preamplifier 8-14
8-74. General 8-14
8-76. Circuit Description 8-14
8-82. Reference Assembly 8-16
8-83. General 8-16
8-85. Circuit Description 8-16
8-87. Analog-to-Digital Convertor (A/D).. 8-16
8-88. General 8-16
8-92. Circuit Description 8-17
8-103. Inguard Controller 8-19
8-104. General 8-19
8-107. Circuit Description 8-19
8-M5. Main Controller 8-22
8-116. General 8-22
8-118. Circuit Description 8-23
8-141. HP-IB Circuit 8-29
8-142. General 8-29
8-144. Circuit Description 8-29
8-168. Front Panel Operation 8-32
8-169. Circuit Description 8-32
TROUBLESHOOTING
8-174. Introduction 8-35
8-176. General Block Diagram Theory
of Operation 8-35
8-179. Outguard Section 8-35
8-185. Inguard Section 8-36
8-194. Preliminary Troubleshooting Check.. 8-36
8-195. Instrument Half-Splitting
Techniques 8-36
8-198. Service Group Summary 8-37
SERVICE GROUP A
8-A-l Turn-On Circuitry (Inguard and
Outguard) 8-40
8-A-3. Inguard/Outguard Isolation 8-40
8-A-5. Outguard Troubleshooting
(Schematic 8) 8-40
8-A-6. Inguard Troubleshooting
(Schematic 5, 6, 7) 8-40
8-A-8. AlO Motherboard Troubleshooting
(Schematic 5, 6, 7) 8-40
8-A-lO. A/D Board Troubleshooting
(Schematic 5, 6) 8-41
8-A-12. Inguard/Outguard Transfer Circuit
Troubleshooting (Schematic 7,8) 8-41
SERVICE GROUP 6
8-B-l. Auto-Cal and DC Troubleshooting
(Inguard) 8-43
8-B-3. Auto-Cal Constants 8-43
8-B-9. Auto-Cal Switch Closures
(Schematic 1, 5, 6, 7) 8-50
8-B-l I.Cal Constants Service Procedure 8-50
8-B-14. Switch Closure Table 8-52
8-B-16. Auto-Cal Troubleshooting
(Schematic I, 7) 8-52
8-B-18. DC Inoperative (Schematic 1) 8-54
8-B-20. Leakage and Other Various
Malfunctions 8-54
8-B-23. 10 VRange or Constant 10 and 11 Fail. ..8-55
8-B-24. 1VRange or Constant 0, I,and 2Fails ..8-55
8-B-25. 100 mV Range or Constant 3Fails 8-55
8-B-26. 100 VRange or Constants 5, 4, and 7
Fail 8-55
8-B-27. 10(X) VRange or Constant 6 Fails 8-56
8-B-28. Various Other Malfunctions 8-56
8-B-30. Other Troubleshooting Hints 8-57
8-B-3I. General Noise 8-57
8-B-33. IX: Noise (Schematic 1, 5. and 6) 8-57
iv

Model 3455A Table of Contents
TABLE OF CONTENTS (Cont'd)
SERVICE GROUP C
8-C-l. AC Convertor Troubleshooting 8-59
8-C-2. True RMS Convertor Servicing
(Schematic 3) 8-59
8-C-4. Preamplifier and Input Alternator
Circuitry 8-60
8-C-6. Absolute Amplifier Circuitry 8-61
8-C-8. Squaring Amplifier, Intergrator, and
Antilog Circuitry 8-61
8-C-IO. AC/DC Operation 8-62
8-C-12. AC Noise (Schematic 3) 8-62
8-C-16. Miscellaneous Troubleshooting
(Schematic 3) 8-63
8-C-17. Average Responding AC Convertor
(Schematic 2) 8-64
SERVICE GROUP D
8-D-l. Ohm Troubleshooting (Schematic 1,4).. .8-65
8-D-2. Ohms Circuit Isolation 8-65
8-D-4. Ohms Servicing 8-65
8-D-6. Ohms Convertor Troubleshooting
(Schematic 1, 4) 8-65
8-D-8. Miscellaneous Ohms Troubleshooting
Hints 8-66
8-D-9. Ohms Offsets 8-66
8-D-ll. Ohms Noise (Schematic 1,4) 8-67
SERVICE GROUP E
8-E-l. A/D Convertor and Inguard Logic
Troubleshooting 8-68
8-E-2. A/D Convertor Servicing
(Schematic 6, 7) 8-68
8-E-4. No A/D Waveform 8-69
8-E-6. Incorrect A/D Waveform 8-69
8-E-7. Correct A/D Waveform 8-69
8-E-8. A/D Noise (Schematic 6) 8-70
8-E-lO. Inguard Logic Troubleshooting
(Schematic 7) 8-70
8-E-12. Inguard Logic Troubleshooting with
no A/D Waveform 8-70
8-E-I3. Inguard Logic Troubleshooting with
an A/D Waveform 8-72
SERVICE GROUP F
8-F-l. Outguard Logic Troubleshooting
(Schematic 8, 9, 10) 8-73
8-F-3. Main Controller Troubleshooting
(Schematic 8) 8-73
8-F-4. Front Panel Troubleshooting 8-73
8-F-5. Front Panel Operation Check 8-73
8-F-6. Front Panel Servicing (Schematic 10). ...8-74
8-F-7. Front Panel LED’s Switch, and Key
Cap Replacement Procedure 8-74
8-F-8. HP-IB Troubleshooting (Schematic 9). ..8-75
SERVICE GROUP 6
8-G-l. Miscellaneous Troubleshooting 8-76
8-G-2. Power Supplies (Schematic 11) 8-76
8-G-3. Reference Assembly (Schematic 5) 8-76
8-G-4. Turn-Over Errors (Schematic 1, 5,
and 6) 8-77
8-G-6. Other Troubleshooting (Schematic 8
and 11) 8-77
SERVICE GROUP H
8-H-l .Troubleshooting Diagrams 8-78
8-H-3. General Troubleshooting Diagram 8-78
8-H-4. Inguard Troubleshooting Diagram. 8-8 1/8-82
8-H-6. Outguard Troubleshooting 8-117/8-118
APPENDIX
Page
A-1. Introduction A-1
A-4. Program Example #1 A-1
A-5. Program Example #2 A-2
LIST OF TABLES
Table Page
1-1. Specifications 1-2
1-2. Typical Operating Charaaeristics 1-4
1-3. Recommended Test Equipment 1-6
3-1. Maximum Front Panel Reading Rates 3-6
3-2. HP-IB Interface Capability 3-7
3-3. Bus Messages 3-8
3-4. HP-IB Program Codes 3-9
3-5. Binary Program Codes 3-11
3-
6. Typical HP-IB Controlled Meassurement
Times 3-14
4-
1. DC Accuracy Test (1 V, 10 VFull Scale;
High Resolution On) 4-3
Table Page
4-2. DC Accuracy Test (High Resolution Off). ..4-5
4-3. DC Accuracy Test (High Resolution On). ..4-5
4-4. AC Accuracy Test 30 Hz to 100 kHz
(Standard Model 3455Aonly) 4-7
4-5. AC Accuracy Tests 100 kHz to 1MHz
(Standard Model 3455Aonly) 4-7
4-6. AC Accuracy Test 30 Hz to 100 kHz
(3455AOption 001 only) 4-8
4-7. Two-Wire Ohm Accuracy Test 4-8
4-8. Four-Wire Ohms Accuracy Test 4-9
4-9. DC Accuracy Test (1 V, 10 VFull-Scale;
High Resolution OfO 4-10
V

Table of Conienis Model 3455A
LIST OF TABLES (Cont'd)
Table Page
4-10. DC Accuracy Test (1 V, 10 VFull Scale;
High Resolution On) 4-10
4-11. DC Accuracy Test (High Resolution OfO. -^11
4-12. DC Accuracy Test (High Resolution On). .4-11
4-13. AC Accuracy Test 30 Hz to 100 kHz
(Standard Model 34SSA only) 4-14
4-14. AC Accuracy Test 100 kHz to 1MHz
(Standard Model 34SSA only) 4-IS
4-15. AC Accuracy Test 30 Hz to 100 kHz
(Model 345SA Option 001 only) .4-15
4-16. Two-Wire Ohm Accuracy Test 4-16
4-
17. Four-Wire Ohms Accuracy Test 4-17
5-
1. DC Zero Adjustment Padding List
(AlORllO) 5-2
5-2. Jumper Removal (A15 Board) 5-4
5-3 .Jumper Removal (A 13Board) 5-4
6-1. Standard Abbreviations 6-1
6-2. Code List of Manufacturers 6-2
6-3. Replaceable Parts 6-3
8-1. AC Convertor Ranging 8-11
8-2. A/D Convertor Switch Control Signal
Descriptions 8-21
8-3. Service Group Listing 8-38
8-B-l. Auto-Cal Constants 8-43
8-B-2. Auto-Cal Switch Closures 8-50
8-B-3. Gate Function in Auto-Cal 8-51
8-B-4. Switch Driver Voltage Levels 8-51
8-B-5. Cal Constant Monitoring Points.
8-B-6. 3455ADVM Switch Closures 8-53
8-B-7. Possible Auto-Cal Failure Causes 8-54
8-D-l. Ohms Gain and Switch Configuration. ...8-66
8-E-l. Mneumonic Definitions 8-71
8-G-l. Power Supplies Locations 8-76
LIST OF ILLUSTRATIONS
Figure Page
2-1. Line Voltage Selection 2-1
2-2. Power Cord Configuration 2-1
2-
3. Typical HP-IB System Interconnections. .,.2-2
3-
1. Front and Rear Panel Features 3-0
3-2. Ohmmeter Measurement Connections 3-2
3-3. Connecting the Guard 3-7
3-4. Address Selection 3-8
3-
5. Operational Verification Flowchart. .3-15/3-16
4-
1. Ambiguous Regions 4-3
4-2. DC Accuracy Test 4-4
4-3. AC/E>C Thermal Transfer Measurement
(Alternate Frequency Response Test). . . .4-6
4-4. DC Accuracy Test 4-11
4-5. AC/DC Thermal Transfer Measurement
(Alternate Frequency Response Test). ..4-13
4-6. DC Common-Mc^e Rejection Test 4-18
4-
7. AC Common-Mode Rejection Test 4-18
5-
1. 100 Volt Zero Adjustment 5-1
5-2. 1Volt Zero Adjustment 5-2
8-1. Function Block Diagram 8-1
8-2. Simplified Input Switching Diagram 8-2
8-3. Operational Attenuator Diagram 8-3
8-4. Basic Voltmeter Diagram 8-3
8-5. Simplified Auto-Cal Switching Schematic. .8-3
8-6. 10 Vdc Input Offset Error measurement. ..8-4
8-7. 1Vdc Input Offset Error Measurement. . . .8-4
8-8. .1 Vdc Input Offset Error Measurement. ..8-5
8-9. 100 Vdc and 100 Vdc Input Offset
Error Measurement 8-6
8-10. 10 Vdc Gain Error Measurement 8-6
8-11. .1 Vdc and 1Vdc Gain Error
Measurement 8-7
8-12. 1Vdc Reference Offset Error
Measurement 8-7
8-13. 100 Vdc and 1000 Vdc Gain Error
Measurement 8-8
8-14. 100 Vdc Reference Offset Error
Measurement 8-8
8-15. Basic Ohms Measurement Diagram 8-9
8-16. 10 kO. 100 kft, 10 MO Offset Error
Measurement 8-9
8-17. Ohms Reference Measurement 8-10 8-10
8-18. Simplified A/D Convertor Diagram 8-10
8-19. Simplified True RMS Convertor 8-11
8-20. Simplified Average Responding AC
Convertor 8-12
8-21. Ohms Convertor Current Source 8-13
8-22. Ohms Convertor Voltage Limit 8-14
8-23. Equivalent DC Preamplifier Output
Circuit 8-15
8-24. DC Preamp, Simplifier Feedback
Circuitry 8-15
8-25. Simplified Voltage Reference Diagram. . . .8-16
8-26. Integrator Output Waveform 8-16
8-27. Integrator Output Waveforms for
Different Input Voltage Levels 8-17
8-28. Simplified A/D Input and Reference
Diagram 8-17
8-29. Simplified A/D Convertor Diagram 8-18
8-30. Simplified Inguard Controller
Flowchart 8-19
8-31. Controller Data Transfer Circuit 8-19
8-32. Data Transfer Signals 8-20
8-33. Inguard Controller Reset Circuit 8-20
8-34. Simplified A/D Convertor Control Circuit8-21
8-35. Simplified Program ROM Circuit 8-22
8-36. Simplified Output Circuit 8-23
8-37. Simplified Main Controller Flowchart. ...8-24
8-38. Main Controller ROM Circuit 8-25
8-39. Main Controller RAM Circuit 8-26
8-40. Main Controller ALU Circuit 8-27
8-41. Main Controller Interrupt Circuit 8-28
8-42. Simplified Turn-On Interrupt Circuit 8-29
vi

LIST OF ILLUSTRATIONS (Cont'd)
8-43. Interface Connections and Bus Structure. .8-30
8-44. Simplified Block Diagram 8-3S
8-45. Inguard-Outguard Connections 8-37
8-B-l. Auto-Cal Constant #11 (10 VOffset) 8-44
8-B-2. Auto-Cal Constant #10 (10 VGain) 8-44
8-B-3. Auto-Cal Constant #9 (10 K. 100 K.
and 10 MOffsets) 8-45
8-B-4. Auto-Cal Constant #8 (10 K, 100 K.
and 10 MOffsets) 8-45
8-B-5. Auto-Cal Constant #7(100 VOffset #2). ..8-46
8-B-6. Auto-Cal Constant #6 (1000 VOffset) 8-46
8-B-7. Auto-Cal Constant #5 (100 VGain) 8-47
8-B-8. Auto-Cal Constant #4 (100 VOffset #1). ..8-47
8-B-9. Auto-Cal Constant #3 (.1 VOffset) 8-48
8-B-lO. Auto-Cal Constant #2 (1 VOffset I) 8-48
8-B-ll. Auto-Cal Constant#! (IV Offset <2)....8-49
8-B-I2. Auto-Cal Constant #0(1 VGain) 8-49
8-E-1. A/D Waveforms 8-68
8-H-l. Assemble and Test Point Loading 8-79
8-H-2. General Troubleshooting Procedure
Diagram 8-79
8-H-3. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 13 8-83/8-84
8-H-4. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 12 8-85/8-86
8-H-5. Inguard Troubleshooting Procedure
Diagram Auto-Cal Circuitry
TEST II 8-87/8-88
8-H-6. Inguart Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 10 8-89/8-90
8-H-7. Inguart Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 98-91/8-92
8-H-8. Inguart Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 88-93/8-94
8-H-9. Inguart Troubleshooting Procedure
Diagram. Auto-Cal Circuitry
TEST 78-95/8-96
8-H-lO. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 68-97/8-98
8-H-l 1. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 58-99/8-100
8-H-12. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 48-101/8-102
8-H-13. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 3.
8-H-14. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 28-I05/8-I06
8-H-15. Inguard Troubleshooting Procedure
Diagram. Auto-Cal Circuitry
TEST 18-107/8-108
8-H-I6. Inguard Troubleshooting Procedure
Diagram, Auto-Cal Circuitry
TEST 08-109/8-110
8-H-17. Inguard Troubleshooting Procedure
Diagram, Inguard/Outguard Transfer
Circuitry 8-111/8-112
8-H-18. Inguard Troubleshooting Procedure
Diagram, Power Supply and
Controller Circuitry 8-113/8-114
8-H-19. Inguard Troubleshooting Procedure
Diagram. A-to-D Convertor
Circuitry 8-115/8-116
8-H-20. Preliminary Outguard Troubleshooting
Procedure Diagram 8-119/8-120
8-H-21. Outguard Troubleshooting Procedure
Diagram, Main Controller
Circuitry 8-121/8-122
8-H-22. Outguard Troubleshooting Procedure
Diagram, RAM Circuitry 8-123/8-124
8-H-23. Outguard Troubleshooting Procedure
Diagram, ALU Circuitry 8-125/8-126
8-H-24. Outguard Troubleshooting Procedure
Diagram, Device Select
Circuitry 8-127/8-128
8-H-25. Outguard Troubleshooting Procedure
Diagram, Interrupt Circuitry. ..8-129/8-130
8-H-26. Outguard Troubleshooting Procedure
Diagram, Display Circuitry 8-131/8-132
8-H-27. Outguard Troubleshooting Procedure
Diagram, HP-IB Circuitry 8-133/8-134
8-H-28. Detailed Block Diagram 8-135
8-H-29. Input and Auto-Cal Switching
Schematic 8-147/8-148
8-H-30. Average Responding AC Convertor
8-149/8-150
8-H-31. True RMS AC Convertor
Schematic 8-151/8-152
8-H-32. Ohms Convertor Schematic 8-153/8-154
8-H-33. Reference Assembly 8-157/8-158
8-H-34. Analog-to-Digital Convertor
Schematic 8-159/8-160
8-H-35. Inguard Controller Schematic 8-161
8-H-36. Main Controller Schematic 8-167/8-168
8-H-37. HP-IB Schematic 8-169/8-170
8-H-38. Front Panel Assembly 8-171/8-172
8-H-39. Power Supply Schematic 8-173/8-174
vii
8-103/8-104

TJS% HEWLETT
PACKARD
SAFETY SUMMARY
TIm failnviRQ Rtittral Mfaty pracMtiMt mutt ba abaarvad during all phaaaa af aparatian, aarvica. and rapair af thia
initrumant Failara ta camply with thasa praeaatiaaa ar with tpacrfic warnings alsawhara in this manual violatas
safaty standards af dasign, manafsetara, and intandad usa of tha instruawnt Hawlatt Packard Company assumas no
liability for tha customar's failara ta comply with thasa raqairamants. This is aSafaty Clau 1instramant
GROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet must be connected to an elec-
trical ground. The instrument is equipped with athree-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) firmiy connected to an
electrical ground (safety ground) at the power outlet. The power jack and mating plug of the
power cable meet International Electrotechnical Commission (lEC) safety standards.
00 NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of flammable gases or fumes. Operation of any
electrical instrument in such an environment constitutes adefinite safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Operating 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 certain conditions, dangerous voltages may exist even with
the power cable removed. To avoid injuries, always disconnect power and discharge circuits
before touching them.
DO NOT SERVICE OR ADJUST ALONE
Do not attempt internal service or adjustment unless another person, capable of rendering first
aid and resuscitation, is present.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT
Because of the danger of introducing additional hazards, do not install substitute parts or per-
form any unauthorized modification to the instrument. Return the instrument to aHewlett-
Packard Sales and Service Office for service and repair to ensure that safety features are main-
tained.
DANGEROUS PROCEDURE WARNINGS
Warnings, such as the example below, precede potentially dangerous procedures throughout
this manual. Instructions contained in the warnings must be followed.
Dangerous voltages, capable of causing death, ore present in this instrument Use ai-
trome caution whoa handling, testing, end adjusting.
A

SAFETY SYMBOLS
General Definitions of Safety Symbols Used On Equipment or In Manuals.
iOR
77*7 X
Instruction manual symbol: the product will be marked with this
symbol when it is necessary for the user to refer to the instruction
manual in order to protect against damage to the instrument.
Indicates dangerous voltage (terminals fed from the interior by
voltage exceeding 1000 volts must be so marked).
Protective conductor terminal. For protection against electrical
shock in case of afault. Used with field wiring terminals to in-
dicate the terminal which must be connected to ground before
opierating equipment.
Low-noise or noiseless, clean ground (earth) terminal. Used for a
signal common, as well as providing protection against electrical
shock in case of afault. Aterminal marked with this symbol must
be connected to ground in the manner described in the installation
(opierating) manual, and before operating the equipment.
Frame or chassis terminal. Aconnection to the frame (chassis) of
the equipment which normally includes all exposed metal struc-
tures.
Alternating current (power line).
Direct current (power line).
Alternating or direct current (power line).
WARNING 1
t
1
t
^caution}
The WARNING sign denotes ahazard. It calls attention to apro-
cedure, practice, condition or the like, which, if not correctly per-
formed or adhered to. could result in injury or death to personnel.
The CAUTION sign denotes ahazard. It calls attention to an
operating procedure, practice, condition or the like, which,if not
correctly performed or adhered to. could result in damage to or
destruction of part or all of the product.
NOTE: The NOTE sign denotes important information. It calls attention
to procedure, practice, condition or the like, which is essential to
highlight.

Model 3455A Section I
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2. This Operating and Service Manual contains informa-
tion necessary to install, operate, test, adjust, and service
the Hewlett-Packard Model 34SSA Digital Vdtmeter.
1-3. Included with this manual is an Operating information
supplement. The supplement is aduplication of the first
three sections of this manual and should be kept with the
instrument for use by the operator.
1-4. This section of the manual contains the performance
specifications and general operating characteristics of the
34SSA. Also listed are available options and accessories,
and instrument and manual identification information.
1-5. SPECIFICATIONS.
1-6. Operating specifications for the 34SSA are listed in
Table 1-1. These specifications are the performance stan-
dards or limits against which the instrument is tested. Table
1-2 lists general operating characteristics of the instrument.
These characteristics are not specifications but are typical
operating characteristics included as additional information
for the user.
1-7. INSTRUMENT AND MANUAL IDENTIFICATION.
1-8. Instrument identification by serial number is located
on the rear panel. Hewlett-Packard uses atwo-section serial
number consisting of afour-digit prefix and afive-digit
suffix separated by aletter designating the country in
which the instrument was manufactured. (A =U.S.A.;
G*West Germany; J=Japan; U=United Kingdom.) The
prefix is the same for all identical instruments and changes
only when amajor instrument change is made. The suHlx,
however, is assigned sequentially and is unique to each
instrument.
age measurements vrith five digit resolution and dc voltage
and resistance measurements with Sor 6digit resolution as
programmed by the user. The 3455 Aemploys an automatic
calibration (AUTO CAL) feature which automatically cor-
rects for possible gain and offset errors in the analog cir-
cuitry to provide maximum accuracy. Aremovable refer-
ence module permits external calibration of the dc voltage
and resistance functions. The reference module can be
removed, calibrated and returned to the instrument, or the
module can be replaced with another recently calibrated
reference. AMATH feature permits voltage or resistance
measurements to be scaled into convenient units or to be-
read directly in percent error from aselected reference.
The 34S5A is HP-IB programmable for system applications.
NOTE
HP-IB is Hewlett-Packard's implementation of
IEEE std 488-1975. “standard digital interface
for programmable instrumentation ”.
M3. OPTIONS.
1-14. The following options are available for use with the
Model 34S5A;
Option 001 :Average Responding AC Converter
Option 907; Front Handle Kit
Option 908: Rack Mounting Kit
Option 909: Front Handle and Rack Mounting Kit
Option 910: Additional Set of Operating Information
and Operating and Service Manuals
1-15. Accessories Supplied.
1-16. Aservice kit (-hp- Part No. 03455-8441 1) consisting
of aPC extender board and afuse is supplied with the
Model 3455A.
1-17. ACCESSORIES AVAILABLE.
1-9. This manual applies to instruments with serial num-
bers indicated on the title page, if changes have been made
in the instrument since this manual was printed, ayellow
“Manual Changes" supplement supplied with the manual
vrill define these changes and explain how to adapt the
manual to the newer instruments. In addition, backdating
information contained in Section VII adapts the manual to
instruments with serial numbers lower than those listed on
the title page.
1-10. Part numbers for the manual and the microfiche
copy of the manual are also listed on the title page.
1-11. DESCRIPTION.
1-12. The Model 345SA Ehgital Voltmeter makes ac volt-
1-18. The following is alist of accessories available for use
with the Model 3455A.
Accessory No. Description
11177A
341IIA
10631A
10631B
10631C
03455-61609
34S5A Reference Module
High Voltage Probe (40 kV dc)
HP-IB Cable 1meter (39.37 in.)
HP-IB Cable 2 meter (78.74 in.)
HP-IB Cable 4meter (157.48 in.)
Inguard/Outguard Service Cable
1-19. Recommended Test Equipment.
1-20. Equipment required to maintain the Model 3455A is
listed in Table 1-3. Other equipment may be substituted if
it meets the requirements listed in the table.
1-1

Section IModel 3455A
Table 1-1. Specifications.
DC Voltage
Specificaiions apply with Auio-Cal ON
Maalaeaai
Raagaa: Diaplay:
High High High High
Resolution Resolution Resolution Resolution
Off On Off On
IV ±149999V
IV IV •149999V ±1499999V
lOV lOV ±14.9999V •14 99999V
1(K)V lOOV ±149 999V ±149.9999V
KXWV 1(XX)V ±1000.C)0V •lOOO.OOOV
Raaga Selactioa: Manual. Automatic, or Remote
Performance (High Resolution Off)
Taaeparatar* Coafficlaat: (0*C to 50*0
O.IV range ±(0.0003% of reading *0.15
diglisirC
IV range: ±(0.0003% of reading +0.015
dlgUs)/“C
lOV range: ±(0.00015% of reading -i- 0.01
digits)/*C
100 &lOOOV rartge: ±(0.0003% of reading .01
digUs)/''C
Accaracy: (1 digit ».0019* of range)
:
24 hours; 23°C ±rC
lOV rartge: ±(0.002% of reading *1digil)
IV range: ±(0.003% of reading +1digt)
O.IV range: ±(0.004% of readirtg +4digits)
100 &lOOOV range: ±(0.004% of reacfing +1di^}
90 days; 23°C ±5-C
lOV range. ±(0.005% of reading +1dlgitl
IV range; ±(0.006% of readirtg +1digil)
O.IV range: ±(0.007% of reading *4di^tsl
100 &lOOOV range: ±(0.007% of reading *1 digil)
6months; 23°C ±5’C
lOV range: ±(0.008% of reading +1di^t)
IV range: ±(0.009% of reading +1di^t)
O.IV range: ±(0.010% of reading +5digits)
100 &lOOOV range: ±(0 010% of reading +1digit)
1year; 23“C ±5'C
lOV range ±(0.013% of reading *1digit}
IV range. ±(0.014% of reading -f 1digit)
0IV range: ±(0.015% of reading +6digits)
100 &lOOOV range ±(0.015% of reading +1digit)
Performance (High Resolution On)
T«Mp«ratNr* (0°C to 50°C)
IV range. ±(0.0003% of reading *0.15
digitsl/’C
lOV range: ±(0.00015% of reading 0.1
digtls)/X
100.& lOOOV range: ±(0.0003% of reading 0.1
digiis)/X
Accaracy: (I digil «,0
24 hours; 23X ±IX
lOV range:
100 &lOOOV range;
IV range
90 days; 23X ±5X
lOV rartge;
.0019* of range)
:(0.002% of reading *3digits)
r(0.004% of reading -f 3digits)
:(0.003% of reading *4digits)
luv rartge; ±{0.005% of readirtg *3digits)
100 &lOOOV range: ±{0.007% of reading -t- 3digits)
IV range: ±(0.006% of reading *4digits)
6months; 2yc ±5X
lOV range: ±(0.008% of reading -t- 3di^ts)
100 &lOOOV range ±(0.010% of reading •* 3digits)
IV range; ±(0.009% of reading -t- 5digits)
1year 23X ±5X
lOV range ±(0.013% of reading -f 3digits)
100 &lOOOV range: ±(0.015% of reading -f 3di^te)
IV range. ±(0.014% of readirtg 4- 6digits)
Input Characteristics
•pat Reaiatsacc:
O.IV through lOV range: >10'" ohms
lOOV and lOOOV range: 10 megohm ±0.1%
(with AuiO-Cal OFF)
M«siM«ai lapat Voftagc:
High to Low Input Terminals: ±1000V pea)<
Guard to Chassis: ±500V peak
Guard to Low Terminal: ±200V peak
NorM«l Mode Rcjectloa (NMR): NMR is the ratio of the
peak normal-mode voltage to the peak error voltage in
the reading.
50 Hz operation: >60 dB at SO Hz ±0.1 9o
60 Hz operation: >60 dB at 60 Hz ±0.1%
CoMMoa Mode Rajcctloa (ECMR): ECMR
is the ratio of the peak common-mode voltage to the
resultant peak error voltage in the reading with Ik(l un-
balance in low lead.
AC Input:
$0 Hz operation: >160dB at 50 Hz ±0.1%
60 Hz operation: >160 dB at 60 Hz ±0.1%
DC Input:
>140 dB
MaslaaM Reediag Rale:fHi Cata Laagtli
HSgb Hlfb
RaaelatSea ••ofatloa
Off Ob
Local 5readlngs/iec 3readings/sec
aaoic 24 readJngs/sec 6readlngs/sec
S«Hi Oaf Laapth
Hl|h
Raaofatloa High
••olatlea
Local
Besote
3.5 readings/sec 2.5 readings/sec.
22 readings/sec 5readings/sec.
1-2

Model 3455A
Table 1-1. Specifications (Cont'd).
Ohms
Section I
Masli
Raa|ce: DUpiay:
High High High High
Resolution Resolution Resolution Resolution
Off On Off On
Ikn t49999kil
Ikn Ikfl 1.49999kfl 1499999kfl
10 kn lOkn 14.9999kn 14.9999%n
lOOkfl lOOkn I49 999kO 149.9999kn
lOOOkfl lOOOkn 1499.99kn 1499.999kn
looookn lOOOOkn 14999 9kn 14999 99kn
Raag* S«l*ctlo«: Manual. Aulomatk;. or Remote
FaBctio* S«l«ctloa: 2wire kohms or 4wire kohms
Performance {High Resolution Off)
Teaperalani Co«fficl«at: (OX to 50X1
O.lkll range. (0.CX)03% of reading + 0.2
digits)/X
1. 10 and 10O<n range: (0.0003% of reading *0.02
dJglt$)/X
lOOOkn range (0.0005% of reading +0.02
digit5)/X
lO.OOOkn range. (0.004% of reading +0.02
digitsl/X
AccMracy: 4wire kohms* (I digit =.(Ml ^of range)
24 hours; 23X ±1X
O.lkn range: :^(0.003% of reading +4digits)
Ikn range: ±(0.003% of readirtg +1di^)
lOkn range: ±(0.005% of reading +2digits)
lOOkn range: ±(0.002% of reading +2digits)
llXIOkn range: ±(0.012% of reading *5digits)
lO.OOOkll range: ±(0.1% of reading 5digits)
90 days; 23X ±5X
O.lkO range ±(0005% of reading +5digits)
Ikn range: ±(0.005% of reading -f 1di^)
lOkn range: ±(0007% of reading *2digts)
lOOkn range: ±(0.004% of reading 2digits)
nXIOkll range: ±(0.014% of reading *5digits)
10.IXXH<n range. ±(0.100% of reading +5digits)
6months; 23X ±5X
O.lkn range: ±(0.005% of reading -f 6digits)
Ikn range. ±(0.005% of reading +1digH)
lOkn range. ±(0.007% of reading +2digits)
lOOkfl range ±(0.004% of readirtg *3digits)
lOOOkn range: ±(0.014% of readirtg *5digits)
lO.OOOkn range: ±(0.100% of reading -f 5di^ts)
1year; 23X ±5X
O.lkn range; ±(0.006% of reading +7digits)
Ikfl range ±(0.006% of reading +2di^ts)
lOkn rartge: ±(0.008% of reading +3digits)
KMkfl rartge ±(0 0(%% of reading *4digits)
lOOOkfl range ±(0.015% of reading 46digits)
lO.OOOkn range. ±(0 100% of reading 46di^)
Performance (High Resolution On)
Taaparatar* CoafflctaBt: (OX to SOX)
I. 10 and llX)kn range: ±(0.0003% of reading 40.2
digiti)/X
lOOOkn range: ±(0.0005% of reading 40.2
diglt$)/X
lO.OOOkn range: ±(0.004% of readirtg 40.2
digils)/X
Accaracy: 4wire kohms* (1 digit =.0001^ of range)
24 hours; 23X ±1X
Ikn range: ±(0.0025% of reading 44digits)
KHtfl rartge ±(0.0045% of reading 44digits)
lOCHtf) rartge. ±(0.0020% of reading 45digits)
lOOOkn rartge: ±(0.0120% of reading 44di^ts)
lO.OOOkn range: ±(0.1000% of reading 4 4 digits)
90 days; 23X ±5X
Ikn rartge: ±(0.0035% of reading 4 5 digits)
lOkO range: ±(0.0060% of reading 45digits)
lOOkO rartge ±(0.0035% of reading 46digits)
lOOOkn rartge: ±(0.0135% of reading 45digits)
lO.OO^n rartge' ±(0.1000% of reading 45digits)
6months. 23X ±5X
Ikn range: ±(0.0040% of reading 46digits)
lOkn rartge: ±(0.(X)65% of reading 46digits)
lOOkn range: ±(0.0040% of reading 47digits)
lOOCMtO range: ±(0.0140% of reading 46digits)
lO.OOOkn rartge. ±(0.1000% of reading 46digits)
1year; 23X ±5X
Ikn range: ±(0.0045% of reading 47digits)
lOkn range ±(0.0070% of reading 47digits)
UXHtn range: ±(0.(X)45% of reading 48digits)
lOOMn rartge: ±(0.0145% of reading 47digits)
10.0(X)kn range: ±(0.1000% of reading 47digits)
*AccBracy: 2wire kohms
All accuracy specifications are the same as 4wire kohms ex-
cept add 0.0()04kn to all readings.
Input Characteristics
NaaiMBM vohage ••crated acrocc
kaowa:
<5 volts for open circuit
<4.7 vohs for valid reading
So«rc« Drltrlag UakaowB (NomIbcI):
Overload Protcciloa:
Non-Destructive —±350V peak
MealMBM SeedlBg Rate:
MHa Gale Leegtk
ntk High
••olerioe ••eleliee
Off Ob
Lecel 4 S readings/ lec. 2readings/sec.
•vole 12 readings/ sec 3teadlngs/sec.
5«Ha Gate Leeftk
Htak High
evltlee ••olBiSee
on Ob
Local 4ieadings//sec. 1.8 readings/sec.
anote 11 readings/sec 2.5 readings/sec.

Section i
Table 1-1. Specifications (Cont'd).
AC Voltage (RMS converter)
Model 3455A
M«sIh«b
DIaplay:
High Resolution High Resolution
On or Off On or Off
IV 149999V
lOV 14.9999V
lOOV 149 999V
lOOOV lOOO.OOV
R««f« 8«i•ctioo: Manual. Automatic, or Remote
Faactioa ACV or Fast ACV
Performance
Teoiperatprc Coafflclapt: (0°C to SOX) for inputs <50kHz
AC coupled. Input >1% of full scale ±(0 002% of reading *2diglts)/°C
AC coupled, input <1% of full scale: ±(0 (X)2% of reading *6digft$)/°C
AC/DC coupled. ±(0.002% of reading +6dlgits)/°C
Accprocy: ±[ %of reading +digits or (% of rartgel '(AC Coupling)’
FAST ACV* SSSHa-2SbH< SSkHs-ltSkHs lSSkHt-2SSkHt*
ACV* 3SHi-2SkHt 2SkH>-lS«kHi lSSkHi-2SSkHi>
2SSkHi-S0«kHi'
25SkHt.SS»kHa*
SSSkHt-lMHi*
SSSkHilMHt*
24 bra:2S-C ±TC .04% -f 40 dig 04% *80 (kg. 1.8% *200 dig 4% -f 400 dig. 5% 2600 dig.
104%) (08%)
1
(.20%) (.40%) (2.6%)
90 dava: 2S C±S°C 05% SO dig
(.05 V»)
0.5% *100 dig
(.10%)
20% *250 dig
1.25%)
5% *300 dig
(.50%)
6% *3100dig
(3.1%)
Cae*:2SX ±5*C
1v*ar;2S'C ±5°C
06% 60 dig
(06%)
07% 70 dig
(,07V»)
0.6% *130 dig
(.13%)
07% *160 dig
(16%)
21% >300 dig
(.30%)
22% +350 dig
(35%)
5.1% +600 dig.
(.60%)
5.3% 700 dig
(.70%)
6.3% + 3S00dlg
(3.5%)
6.6% 3900dig
(3.9%)
MUSI be loMPoetf Su b*
^MtbiabBiis aav sisty k* npiA kveb aaow t' >*«A«e
r^M. eaupMMwb I%of hJ «kb ^?0 Mkboa« «<WMC> lebb ewr«a
S'.sfktfwbv kM l7n*^Bkb0w«4i«M>««<b *
2lue AC K<9U^if6 m#wik
CsMl Factor: 7:1al full scale
Input Characteristics
lapat iBpadaaca:
Front Terminals—2M0±1% shunted by less than l(X)pF
Rear Termiisals—2MH± 1% shunted by less than 75pF
NaalwMB lapul Voltaga:
High to Low Terminals: ±1414 volts peak (Subject to a
10^ voU •Hz limitation)
Guard to Chassis: ±S00V peak
Guard to Low Terminal ±200V peak
AC tt mmT si naWip •TOtaniBkbohO ««ur«> isbk vwepr
MAC DC atfut «b«e* bIbMr Mkd M««b «M 14^ abMv ktfuiBv MNr
ef lOObHt 4Sr kpeerbed O9>e IVand IIW tan^n
•Adt—r» mnet ippcAad d<4m tw pBdvd aacaodi It)'
-Sony «iii »««>»>.
Navlaiaa Raadlag Rata:
SiHi Oaf Laagth
ACV IFAST ACV
Local 1.3 readings/sec 4 5 readlngs/see
1.3 readings/sec 13 readings/sec
SSHa Gaf LaaftS
ACV IFAST ACV
11readings/sec 3.5 readings/sec
1Ireadings/sec. 12 readings/sec
Raapoaae Tiaa:
ACV and FAST ACV
First reading to <0.1% of step size when triggered coinci-
dent with step change when on correct range.
(for AC signals with no DC component)
1-4

Model 3455A Section 1
Table 1-1. Specifications (Cont'd).
AC Voltage (Average Converter Opt. 001
)
Raag**: Maalnaai Duplay:
High Resolution
On or Off
High Resolution
On or Off
IV
lOV
lOOV
lOOOV
1.49999V
14 9999V
149.999V
lOOO.OOV
Ranga Salactloa: Manual. Automatic, or Remote
Faactloa Salactloa: ACV ot Fast ACV
Performance
Taaiparatara Coafflciaat: (0°C to 50°C)
±(0.002% of reading +2di$ts)/°C
Accaracy: ±[% of reading +digits or (% of range)]'
FAST ACV*
ACVJ SMHa-SMtb
SPHs-SPHa
SPPHa-lkHa
SPHa-lPtHa
IkMs-lPPkHa
IPPHs-lPPklU
lPPkHs-25PkHa*
lPPkHi-2SPkHa*
24 hr»: 22*C :1*C 047% +70 dig
(.07%)
032% 50 dig
(.05%)
0.09% 25 dig
(025%)
0.70% 60 dig
(.06%)
9«days:2S°C :S°C O.S0% *70 dig.
(.07%)
0.35% 50 dig.
(.05%)
0.1% +25<kg.
(.025%)
0.75% +60 dig.
(.06%)
Caoe: 22°C ±5X 0.50% -f 70 dig
(.07%)
0.40% 60 dig.
(.06%)
0-1% 30 dig
(03%)
0.75% +70 dig.
(.07%)
1yt.i 2S°C ±S‘C 0.50% +70 dig.
(.07%)
040% +70 dig.
(.07%)
0.12% -i- 35 dig.
(.035%)
0.75% +80 dig.
(.08%)
’Caart PHa retpurud M
Ob IOOOV ^401 9^ ydr •kH<
'Fsigapmias. yaaPM i*un lOQbHa an Iand KM
s
gAfw
MesfKv RnRi.d>«d d^*«fV ^ndwri 14
Input Characteristics
lapat iHpadaaca:
Front Terminals—2Mfl±l% shunted by less than lOOpF
Rear Terminals—2MO±l% shunted by less than 75pF
Maalaaa lapat Voltaga:
High to Low Terminals: ±1414 volts peak (Subject to a
10^ volt •Hz limitation)
Guard to Chassis ±500V peak
Guard to Low Terminal ±200V peak
Mulaaai Raadlag Rato:
MHt Gate Laagih SPHa Gate LeagSb
ACV FAST ACV ACV FAST ACV
13 teadir:gs/scc. 4.5 readtngs/sec 11r«adings/sec. 3.5 leadings/sec
13readings/sec. 13 readings/ sec Mreadings/sec 12 readIngs/sec
Reapoaea Tiaaa:
ACV and FAST ACV
First reading to <0.1% of step size when triggered coinci-
dent with step change when on correct range
(lor AC signals with no DC component)
J-5

Section IModel 3455A
Table 1>1. Specificationi (Cont'dl.
Math
Sd«: %Error: x100%
XIs present reading Yand Zare previously entered read-
ings. numbers entered from Ihe troni panel or valuesentered
by external program.
NMBb«ri (Entered or Displayed)
±199.999 9
Accaracyi
±(ACCURACY OF XREADING ±1 DIGIT OF DIS-
PLAYED ANSWER)'
This assumes no "Y” or "Z" error.
Xis present reading. YIs apreviously entered reading, or
number entered from the front pane) or by external program
MaalHMM Noabor: (Entered or Displayed)
±199.999 9
Acctarscyt
(ACCURACY OF XREADING ±1DIGIT OF DIS-
PLAYED ANSWER)'
This assumes no "Y” error.
Table 1-2, Typical Operating Characteristics.
Range SMactton: Manuel, Auiomalic.or Ramota
Function Salaetlon;
DC Volti
AC Voltl (ACV or FAST ACVJ
OHMS <2 wira kllohm or 4wire kilohm)
TEST
NORMAL MODE REJECTION (50 Ht ORERATION)
NORMAL MODE REJECTION (60 HI OPERATION)
Efiective NoIk Bandwidlli *jj
T1/60 Mc loi 5digit 60 Hz Operation
T-2/1S lecloi 6digit 60 Hz Operation
T*t/SO aec for 5digit 50 Hz Operation
T-4/25 ICC for 6digit SO Hz Operation
COMMON MODE REJECTION (I KILOHM IMBALANCE)
EFFECTIVE COMMON MOOE REJECTION (50 Hz OPERATION)
1-6

Model 34SSA Section I
Table 1-2. Typical Operating Characteristics (Cont'd).
EFFECTIVE COMMON MODE REJECTION (60 Hz OPERATION)
Typical HF-IB Hsndihake Timei:
Accepi Data —I3455A addressed to listen or ATN true)
500 psec per character typical 19 delay tourcel
Output Data -(3455A addressed to talk)
250 Atec per character typical 10 delay acceptor)
Gefieral (Auto Cal must be on for 75 seconds to meet all
specifications)
Overload Irtdication: OL ^ ^
Operstiny Temperature: OCtoSOC
Warmup Time: One hour to meet all specifications
Humidity Range: <95% R^H., 0Ct§ 40 C
Storage Temperature; —40 Ciot75 C
Power; 100/120/240 V+5%, -10% 48 Hz to 400 Hz line
operation <60 VA
220 V110% 48 Hz to 400 Hz line operation
<60 VA
Dimensions: 88.9 mm high x425.5 mm wide x527,1
mm deep high x16%" wide x20%" deep)
Weights: Net -9 kg (21 lbs.)
Shipping -12 kg (26 tbs.)
1-21. SAFETY CONSIDERATIONS.
1-22. The 34SSA is asafety class Iinstrument (provided
with aprotective earth terminal). The instrument and man-
ual should be reviewed for safety symbols and instructions
before operation.
1-7

Section 1Model 3455A
Table 1-3. Recommended Test Equipment.
Instrument Critical Specification Recommended Model Use
DC Voltage Standard Voltaga: 10 mV to 1000 V
Accuracy: i.005% Syetron Donner
Model Ml 07 PAT
AC Calibrator Frequency: 30 Hz to 100 kHz
Output Level: 100 mV to 1000 V
Accuracy: i.1 %
Voltage Stability <6 moi.) t.02%
-hp- Model 745A
AC Calibrator
hp- Model 746A
High Voltage Amplifier
PAT
Test Oscillator Frequency: 10 250 kHz
Output: 3Vrms into 50 n
Frequency Response t.25%
-hp- Model 6S2A
Test Oscillator
P
Resistance Decade Resistance: 100 nto 10 MD
Accuracy: t.004% Gen Rad Model i GR 1433-Z Decade
Resistor
PAT
DC Null Voltmeter Voltage Range. 1siV to 10 V-hp- Modal 419A PAT
Reference Divider Division Ratio Accuracy t.001%
Output Voltage Range -1V10 1kV Fluke Model 750A
Refereitce Divider PA
DC Transfer Standard Output Voltages: 1V, 1.018 V.
1.019V. 10 V
Accuracy: t5ppm
Stability: t.001% <30 daysl
Fluke Model 731A
DC Transfer Starrdard
PA
Electronic Counter 50 Hz to 60 Hz -hp- Model S300A/S302A
Measuring System P
ResKtance Standard Resistance: 1kfl
Accuracy :±.0005%
Resistance: 100 K
Accuracy: ±.002%
Guildine Model
9330/1 Kor 9330A/1 K
Guildline Model 9330/100 f
A
Bus System Analyzer HP-IB Control Capability -hp- Model 59401
A
Bus System Analyzer T
Calculator HP-IB Control Capability must
serve as printer for 3455A
Output data.
-hp- Model 9825A OT
Oscilloscope Bandwidth: DC to 10 MHz
Sweep Time: 0.1 ps to 1sec/div
Sensitivity: 1V/div
-hp- Model 180C/D
Oscilloscope with
IBOIAand 1821A
plug-in units
T
Digital Voltnteier Voltage Range; 10 mV to 1000 V
Resolution: lOpV -hp. Model 3490A PAT
Raiisiori Resistances:
1kn *10%
10 kn 10.1%
1Mn to.1%
-hp. Part No.
0684-1021
0698-4157
0698-6369 P
Signature Artalyzer -hp- Model S004A T
PPerformance Checks TTroubleshootirtg
A-Adjustmems 0»Operetors Check
1-8

Model 3455A Section II
SECTION II
INSTALLATION
2-1. INTRODUCTION.
2-2. This section contains information and instructions
necessary to install and interface the Model 34S5A Digital
Voltmeter. Also included are initial inspection procedures,
power and grounding requirements, environmental informa-
tion, and repackaging instructions.
2-3. INITIAL INSPECTION.
24. This instrument was carefully inspected both mechan-
ically and electrically before shipment. It should be free of
mars and scratches and in perfect electrical order. The
instrument should be inspected upon receipt for damage
that might have occurred in transit. If the shipping con-
tainer or cushioning material is damaged, it should be kept
until the contents of the shipment have been checked for
completeness and the instrument has been mechanically
anJ electrically checked. Procedures for testing electric^
performance of the 3455A are given in Section IV. If the
contents are incomplete, if there is mechanical damage or
defect, or if the multimeter does not pass the Performance
Tests, notify the nearest Hewlett-Packard Office. (A list of
the -hp- Sales and Service Offices is presented at the back of
the manual.) If the shipping container is damaged, or the
cushioning material shows signs of stress, notify the carrier
as well as the Hewlett-Packard Office. Save the shipping
materials for the carrier's inspection.
2-5. PREPARATION FOR USE.
2-6. Power Requirements.
*em teOVMH
NOMINAL
VOLTAGE OPERATING RANGE
-10%, +6% of nominal FUSE
100 volts 90 to 105 volts 0.5 A
120 volts 10B to 126 volts 0.5 A
220 volts 198 to 231 volts 0.25 A
240 volts 216 to 252 volts 0.25 A
Figure 2-1. Line Voltage Selection.
used for -hp- power cables. The -hp- part number directly
below each drawing is the part number for a power cable
equipped with aconnector of that configuration. If the
appropriate power cable is not included with the instru-
ment, notify the nearest -hp- Sales and Service Office and
the proper cable will be provided.
2-12. Grounding Requirements.
2-13. To protect operating personnel, the National Electri-
cal Manufacturer’s Association (NHMA) recommends that
the instrument panel and cabinet be grounded. The Model
34SSA is equipped with athree conductor power cable
which, when plugged into an appropriate receptacle,
grounds the instrument.
2-7. The Model 34SSA requires a power source of 100.
120. 220, or 240 Vac (+ S% -10%). 48 IIz to 400 Hz single
phase. Maximum power consumption is 60 VA.
2-6. Line Voltage Selection.
2-9. Before connecting ac power to the 34S5A, make sure
the rear panel line selector switches are set to correspond to
the voltage of the available power line as shown in Figure
2-1. Also, be sure the proper fuse is installed. The multi-
meter is shipped with the line voltage and fuse selected for
120 Vac operation.
FCAUTION;
Be sure ihe SO -60 Hz rear panel switch is set
for the proper line frequency foryour location.
2-10. Power Cable.
2-11. Figure 2-2 illustrates the standard configurations
2-14. Bench Use.
2-1 5. The Model 34SS Ais shipped with plastic feet and tilt
stands installed and is ready for use as abench instrument.
The plastic feet are shaped to permit “stacking” with other
2-1

Section II Model 345SA
full-module Hewlett-Packard instruments. The till stands
permit the operator to elevate the front panel for operating
and viewing convenience.
2-16. Rack Mounting.
2-17. The Model 34SSA may be rack mounted by adding
rack mounting kit Option 908 or Option 909. Option 908
contains the basic hardware and instructions for rack
mounting; Option 909 adds front handles to the basic rack
mount kit. The rack mount kits are designed to permit
the Multimeter to be installed in astandard 19 inch rack.
When rack mounting, additional support must be provided
at the rear of the instrument. Be sure that the air intake at
the rear of the instrument is unobstructed.
2-18. Interface Connections.
2-19. The Model 34S5A is compatible with the Hewlett-
Packard Interface Bus(HP-IB).
NOTE
HP-IB is Hewlett-Packard's implementation of
IEEE std 488-1975, "Standard Digital Interface
for Programmable Instrumentation
The Multimeter is connected to the HP-IB by connecting an
HP-IB interface cable to the 24-pin connector located on
the rear panel. Figure 2-3 illustrates typical HP-IB system
interconnections and shows the 10631A/B/C HP-IB Inter-
face Cable connectors. Each end of the cable has both a
male and female connector to simplify interconnection of
instruments and cables. As many as IS instruments can be
connected by the same interface bus: however, the maxi-
mum length of cable that can be used to connect agroup of
instruments must not exceed 2 meters (6.S ft.) times the
number of instruments to be connected, or 20 meters
(65.6 ft.), whichever is less.
2-20. Address Selection. The HP-IB address switch,
located on the rear panel, permits the user to set the “talk”
and “listen” address of the instrument. The talk and listen
address is a7-bit code which is selected to provide aunique
address for each bus instrument. The 345SA normally
leaves the factory with the address switch set to a“Listen”
address of 6and a“talk” address of V. The address switch
also allows selection of a“talk-only” mode. Refer to
Paragraph 342 for address selection instructions.
2-21. External Trigger. ABNC connector, located on the
rear panel, is provided for an external trigger input. The
trigger input is to be driven with TTL level signals.
2-22. ENVIRONMENTAL REQUIREMENTS.
WARNING
To prevent electrical shock or fire hazard, do
not expose the instrument to rain or moisture.
2-23. Operating and Storage Temperature.
2-24. In order to meet the specifications listed in Table
1-
l, the instrument should be operated within an ambient
temperature range of 23'"C tS^C (73“F ±9“F). The instru-
ment may be operated within an ambient temperature
range of 6°C to +55®C (+ 32°F to +131°F) with degraded
accuracy.
2-
25. The instrument may be stored or shipped where the
ambient temperature range is within —40^C to *7S°C
(_40®F to +167'*F). However, the instrument should not
Figure 2-3. Typical HP-IB System Interconnections.
2-2