Name: HP 3456A
Brand: HP
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Manual Changes2
Table of Contents4
Safety Summary9
Safety Symbols10
General Information17
Options17
Description17
Specifications17
1·11. Instrument and Manual Identification17
1·16. Accessories Supplied17
Specifications18
General Information18
Accessories Available24
Recommended Test Equipment24
1·20. Safety Consideration24
General25
Power Requirement26
Power Cords and Receptacles26
Grounding Requirements26
Section 11. INSTALLATION26
Preparation for Use26
Rack Mounting27
Interface Connection27
Address Selection27
Power Cables27
Typical HP-IB System Interconnection28
HP-IB Connector28
External Trigger29
Repackaging for Shipment29
Address Selection29
2·25. Voltmeter Complete Connector29
Environmen tal Requirements29
Operating and Storage Temperature29
Operation30
General Operating Characteristics30
Reset30
Pre-Operating Instructions30
3·11. Turn·on and Warm·up30
Introduction30
Front and Rear Panel Features31
Self Test Operation32
Front Panel Display Area32
Display33
Error Messages33
DC Voltage Measurement33
Front Panel Voltmeter Configuration Area33
AC Voltage Measurement34
AC+DC Measurement34
Resistance Measurement34
Ohms Connection34
Shift Operltion35
Ratio35
Offset Compensated Ohms Measurement (O.C. Ohms)36
Ranging36
Autorange36
Instrument Trigger Modes37
Autozero Effects on 4-Wire Ohms Measurement37
Analog Filter38
Storing into Registers38
Front Panel Numbered Keyboard Area38
Registers and Math Listing39
Math Feature40
Number of Power Line Cycles Integrated40
Digits Displayed40
Number of Readings Per Trigger40
Optimizing Reading Rate41
At Turn on41
Your Signal Environment41
Speeding the Reading Transfer41
High Speed Scanning42
Data Throughput42
Waveform Characterization42
%Error43
Scale43
Pass/Fail (Limit Test)43
Null43
Thermistor43
Db44
Dbm44
Null44
Thermistor44
Statistics45
Mean45
Variance45
Reading Storage46
Recalling Single Readings46
Scroll Readings46
Voltmeter Complete47
Guarding47
Remote Operation47
HP-IB Description47
Data48
Trigger48
Local48
Require Service (SRQ)48
Status Byte49
Status Bit50
Abort (Unterface Clear)50
Addressing50
Address Codes51
Talk-Only (no Controller)51
HP-IB Programming51
Algorithm51
Data51
Clear51
Remote51
Local Lockoul51
Clear Lockout and Set Local51
Require Service (SRQ)51
Programming the Unit over the HP-IB52
Program Codes (Data Received by the Unit)52
Storing into Registers (Y, Z, Delay, Etc.) over the HP-IB52
Program Codes Table53
Programming the SRO Mask54
ASCII Format54
Overload Output Statement54
Packed Format54
Reading the Unit's Output Data55
Disabling the End or Identify (EOI) Statement55
System Output Mode55
Home Command55
Front/Rear Switch Position56
Complete Program Example56
Front Panel SAD56
Abort (Interface Clear)56
Programming the 3456A over56
Instrument Program Memory Operation57
Storing Program Codes57
Program Execution57
Recall of Readings from Memory57
The Hp·ib57
A Program Codes57
Data Ready58
Numeric Entry Format and Other Input Considerations58
Operator's Check58
DCV Test59
Ohms Test59
Section IV. PERFORMANCE TEST59
ACV Test60
Test Cards60
Calibration Cycle60
Test Failure60
The 3456A)60
Recommended Test Equipment61
Specification Breakdown62
Test Consideration62
Ambiguous Region62
General62
DCV Test Limits63
DCV Accuracy Test Set-Up64
Schematic of the DCV Accuracy Test Set-Up64
Ratio Test Connection65
Ohms Test Limits66
OC Common Mode Rejection Test66
4-Wire Ohms Short67
ACV Test67
Alternate 250 Khz ACV Test68
ACV Test Limits68
Adjustments69
Adjustment Interval69
Adjustment Sequence69
Introduction69
Adjustment Location70
DCV Adjustment70
DCV Test Equipment Connection71
Ohms Adjustment72
ACV Adjustments72
Combined Performance Test and Adjustments73
DCV Test and Adjustments73
Ohms Test and Adjustment75
Ohms Test and Adjustment Limits76
DC Common Mode Rejection Test76
ACV Test and Adjustment Limits77
Replaceable Parts79
Standard Abbreviations79
Code List of Manufacturers80
Exchange Assemblies80
Replaceable Parts Table81
Chassis/Cabinet Parts View98
A20 Board Miscellaneous Fastener Parts View99
Top View of Chassis with PC Boards Removed100
Bottom View of Chassis with PC Boards Installed101
Bottom View of Chassis with PC Boards Removed102
Side Views of Chassis103
Front Assembly (Inside View)104
Inguard Chassis - Front and Rear Panel105
View of Front Terminal Assembly, Guard Switch, Front/Rear Switch106
Inside View of Rear Terminal Assembly and AC Power Switch107
Power Transformer and Bracket; Voltage Regulator, Zener Diode View108
Diode, and Bracket108
Manual Changes109
Backdating110
Individual ROM Signatures114
With PC Boards Installed115
Service121
Safety Considerations121
Theory of Operation121
Outguard Section121
Simplified Block Diagram122
Front/Rear Switch123
Input Protection123
DC Volts Measurement123
A20 Board Component Numbering Structure124
Input Switching and "Range and Function Control Logic"124
100 V and 1000 V Ranges124
Fet Switching Technique124
Gate Bias Amplifier #1125
Charge Conditioning Circuits125
Analog Filter125
Autozero (AZ)126
Input Amplifier126
Input Switching Schematics127
Analog-To-Digital IA/DI Converter128
Input Amplifier Gains128
Gain Switching128
Traditional Dual-Slope Converter128
Runup129
Multi-Slope II A/D Coverter - Runup129
S + 4 and S - 4 Slope Generation130
Slope Generation with Input Signal Applied130
Runup Timing131
Readout Digit Generation During Runup131
Rundown131
Rundown Timing Chart132
Rundown Slope Sequence132
S - 3, S + 2, and S - 1 Slopes133
Slope Generation133
Waveform Composite (Runup and Rundown)133
A/D Converter Circuit Description133
Integrator Circuit134
Slope Control Circuits134
Analog Overload Detection Circuit134
Digital Overload134
12 Volt Reference135
Circuit Description135
Zero Comparator135
A/D Autozero135
Troubleshooting135
Ohms Measurements136
Reference Voltage Section136
Calibration Components136
Current Regulator136
Ohms Current Source137
Current Regulating Fet's Q203, Q20S, Q208, and Q209137
Range Switching137
High Voltage Protection Circuits137
Simplified A/D Converter Schematic138
Simplified Reference Schematic139
Ohm's Current Schematic140
Offset Compensated Ohms141
Input Switching for Ohms Measurements141
Autozero - 4 WIRE OHM141
Level Shift for Low Ohms Offset Circuit141
AC Volts Measurements142
Input Attenuator and Amplifier142
ACV and ACV + DCV142
Comparator and FET Switch Operation142
1, 10, and 100 Volt Range Switching143
1000 Volt Range143
Absolule Value Amplifier143
RMS Converter144
Squaring Amplifier144
Averaging Amplifier144
Square Root Amplifier144
Ratio Measurements145
AC Converter Stage Gains145
AC Converter, Output Signal Path145
AC Volts Measurements Schematics146
Ratio Measurement, Reference High147
Ratio Measurement, Reference Low147
Inguard Logic (A30 Board)148
Isolation Logic148
Simplified Block Diagram148
Receiver149
Transmitter149
Inguard Microprocessor151
Range and Function Control151
Analog Filter151
Port Expander152
Dual 1-4 Decoder A20U701152
ALE and ALE Synchronizer152
ALE Clock for A/D Converter153
Frac153
Slope Sequence During Rundown154
FRAC Circuit Description155
Zero-Crossing Deleclion Circuit (U3A)155
FRAC Enable155
Rundown Timing Chart155
S + 0 Period156
Glitch Suppressor156
Lovl156
FRAC Circuits Diagram157
Outguard Section (A3 and A4 Boards)159
Main Controller Circuits (A4 Board)159
Simplified Block Diagram159
Clock Generator160
Address Bus Structure160
Data Bus and Dala Transfer161
True VMA Generalor161
True VMA Generator, Timing Diagram161
OBE Stretcher, Timing Diagram161
Speed Compensating Circuits Diagram162
Peripheral Select Decoders163
Decoder, U19 and U17, Output Lines163
Read Only Memory (ROM)164
Random Access Memory (RAM)164
Isolation Logic (A3 Board)164
Keyboard Scan Logic165
Keyboard Scan Circuits165
Display Ready Circuit166
Display and Annunciator Drive166
Sample Rate Indicator Circuit166
Keyboard, Display and Annunciator Circuits166
HP-IB (A3 Board)167
Interface Adapter167
Bus Transceivers168
External Trigger Circuit168
Signature Analysis (SA) Test Modes168
Power Supplies169
Inguard Power Supply169
Outguard Power Supply169
Power Supply Ready Line170
Troubleshooting171
Board Removal and Installation171
Service Group Listing171
Inguard Grounding Structure172
Service Group Summary173
Component Reference Designator173
Selecting the Self-Test174
Self-Test Limits174
Self-Test Troubleshooting175
Mnemonic Definitions176
Mnemonic Definitions and General Schematic Notes178
Detailed Block Diagram179
A20 Board - Input Switching - Component Locator Table180
Input Switching Schematic182
A20 Board - Ohm's Current Source - Component Locator Table183
Ohms Current Source Schematic185
A20 Board - Input Amplifier - Component Locator Table186
Input Amplifier Schematic188
A2D Board - A/D Converter - Component Locator Table189
A/D Converter Schematic191
A24 Reference Schematic193
A25 Reference Schematic195
Range and Function Control Logic197
A40 Component Locator Table198
AC Converter Schematic200
A30 Component Locator Table201
A30 Board Table201
Inguard Logic Schematic203
A4 Component Locator Table204
Main Controller (Outguard) Schematic206
Keyboard Scan Logic, Display and Annunciator Drive Schematic209
Keyboard Display and Annunciators Schematic211
Isolation Logic Schematic214
HP-IB Logic Schematic217
Power Supply Schematic220
Service Group a221
Outguard Failures and Troubleshooting222
Turn-On Failure222
Inoperative Display222
Data Bus Signatures223
Address Bus Signatures223
ROM Select Signatures223
Flowcharts224
Strobe Signatures225
RAM Select Signatures225
Inoperative Annunciator231
Inoperative Keyboard231
Combined Display, Annunciator and Keyboard Failure231
HP-IB Failure231
Microprocessor Troubleshooting232
Data Bus Lines Troubleshooting232
Outguard Isolation Logic233
Transmitter Troubleshooting234
Receiver Troubleshooting235
External Trigger Inoperative236
Voltmeter Complete Inoperative236
Hp-IB Address Selection Inoperative236
Service Group B237
Inguard Logic and Failure Symptoms238
Inaccurate or Noisy Readings239
Normal Mode Rejection239
Range Failure 8239
A/D Troubleshooting240
Overload Failure240
Constant Zero Reading241
Inaccuracy or Noise242
A/D Digital Circuitry Troubleshooting244
Inguard Logic Troubleshooting244
A/D Converter Signatures245
A/D Slope Configuration246
Static State of the A/D Digital Circuitry246
Pre-Troubleshooting Information247
Range and Inguard Logic Failure247
Isolation Logic Troubleshooting248
Inguard Signature Analysis Routines249
Service Group C252
Pre-Troubleshooting Information252
DCV Troubleshooting253
All Ranges Inoperative (Overload, Zero Reading, Accuracy or Noise)253
Some Ranges Inoperative253
Inguard Switch Closure Commands254
Input Switching Troubleshooting255
DCV Circuitry Isolation255
Floating Reading256
Inaccurale Reading256
Overload Reading257
Input Amplifier Troubleshooting258
Gate Bias Amplifier259
Saturated Output260
Oscillating Output260
Noisy Output260
Ratio Failure261
Analog Filter Failure261
Service Group D262
Inoperative Ohms Ranges263
Ohms Accuracy Failures263
Ohms Noise263
Ohms Switch Closure Commands264
Isolating the Ohms Circuitry265
Ohms Protection Circuitry Troubleshooting266
Ohms Current Source Troubleshooting267
Zero Reading and Noise on some Ranges268
Overload Reading on some Ranges268
High or Low Reading on some Ranges268
4-WR Troubleshooting268
Range Failures and Defective Fets269
Constant Overload, or High Positive or Negative Readings269
4-WR Accuracy Failures269
4-WR Noise Failures270
DC Ohms Failure270
Service Group E271
Switch Closure Command Table272
ACV and ACV+DCV Failure Isolation272
ACV and ACV+DCV Troubleshooting273
Input Attenuator Troubleshooting274
Absolute Value Amp Troubleshooting274
RMS Converter Troubleshooting275
ACV Troubleshooting276
Inaccuracies at All Frequencies276
Inaccuracies at High Frequencies276
Inaccuracies at Lower Frequencies277
Service Group F278
Power Supplies Troubleshooting279
Inguard Power Supplies279
Power Supplies Levels280
Power Supplies Jumpers and Locations280
Internal Adjustment Procedures280
Reference Adjustment280
A/D Adjustment281
100V Adjustment282
ACV Adjustment283
250 Khz Adjustment284
General HP-IB Description285
Interface Connection and Bus Structure285
HP-IB System Overview286
Basic Device Communication Capabilities286
HP-IB Messages286
HP-IB Worksheet287
Unpacking Program288
Multiple Reading Transfer Programs289
Bus Message Implementation289
Front/Rear Switch Lock Procedure291
Lock Installation Procedure291
Lock Removal Procedure291
A20U200 Signal Conditioning Fineline292
A40U3 AC Goin Fineline293
A20U500 A/D and Reference Fineline294
Example Program Summary295
Equipment Required295
Set-Up296
Check-Out296
System Connection Diagram296
Programming Examples297
Example Program Z: Triggering Techniques298
Example Program 3: Using a Math Function299
Example Program 4: 3456A Internal Memory - Storing Data299
3456A Program Codes307
Status Byte Defintion308

Brand	HP
Model	3456A
Category	Measuring Instruments
Language	English

HP 3456A Service Manual

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HP 3456A Specifications

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