HP 438A - MANUAL CHANGES

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MANUAL CHANGES

Note

This manual does not contain any backdating information. If

backdating information is required for operating or repairing your

HP 438A with serial prefix 2822A or 2839AU and below, you must

purchase manual part number 00438–90015.

7-1

Main Page

Acoustic Noise Emissions3
General Information7
Introduction7
Specifications9
Safety Considerations9
Instruments9
Manual Changes Supplement9
Description10
Options10
Electrical Options10
Mechanical Option10
Accessories Supplied11
Accessories Available11
Rack Mounting Kits11
Cables11
Recommended Test Equipment12
Supplemental Characteristics15
Additional Supplemental Characteristics16
Installation19
Initial Inspection19
Warning19
Preparation for Use20
Power Requirements20
Installation Checklist20
Line Voltage and Fuse Selection21
Selection of Operating Voltage21
Power Cable22
Power Cable and Line Plug Part Numbers23
HP-IB Address Selection and Configuring24
Allowable HP-IB Address25
Interconnections26
Mating Connectors26
Operating Environment26
Bench Operation26
Logic Levels27
Mating Connector27
Mating Cables Available27
Cabling Restrictions27
Storage and Shipment28
Rack Mounting28
Environment28
Packaging29
Tagging for Service29
Original Packaging29
Other Packaging29
Operation31
Operating Characteristics31
Local Operation31
Initial Turn-On Information31
Remote Operation HP-IB32
Operator's Maintenance32
Major Operating Characteristics33
Simplified Front Panel Features35
Rear Panel Features36
Preset37
Calibration37
Measurement Modes37
Sensor37
Measurement Parameters38
Set a and Set B38
Cal Factor38
Filter38
Measurement Units39
Store and Recall39
Range39
Offset39
Turn on Instructions40
Turn on40
Error Messages41
Power Reference and Calibration41
Operator's Checks42
Basic Functional Checks42
HP-IB Functional Checks42
Equipment43
Front Panel Checks Setup44
HP-IB Checks46
Initial Setup47
Remote and Local Messages and LCL47
Sending the Data Message48
Receiving the Data Message49
Local Lockout and Clear Lockout49
Clear Message50
Abort Message51
Status Byte Message51
Require Service Message52
Status Bit Message53
Trigger Message54
Message Reference Table55
Remote Operation58
Remote Mode58
Remote Capability58
Local to Remote Changes58
Local Mode59
Addressing59
Local Lockout59
Turn on Default Conditions60
Data Messages60
Turning off Functions61
Hold Range61
Hold Filter62
Limits62
Display Functions62
Display Enable62
Triggering Measurements with the Data Message63
Hold63
Trigger Immediate63
Trigger with Delay63
Free Run64
Program Order Considerations64
Data Output Format65
Receiving the Clear Message70
Receiving the Trigger Message70
Status Message Output Format70
Codes Used in Status Message71
Response to a Clear Message72
Response to a Trigger Message72
Receiving the Remote Message73
Receiving the Local Message73
Receiving the Local Lockout Message73
Receiving the Clear Lockout73
Sending the Require Service Message74
Service Request Mask74
Measurement Error74
Sending the Status Byte Message75
Sending the Status Bit Message75
Receiving the Abort Message76
HP-IB Syntax and Characteristics Summary76
Status Byte77
HP-IB Codes to Parameter Summary77
Cal Adj78
Program Codes79
Indications79
Comments79
Related Section80
Dbm/Watt83
Measurement Errors87
Entry Errors89
Filters90
Auto Filter Setting for each Range90
Performance Tests119
Equipment Required119
Performance Test Record119
Calibration Cycle120
Abbreviated Performance Test120
Test Procedure120
Zero Carryover121
Test121
Zero Carryover Test Setup121
Instrument Accuracy Test123
Instrument Accuracy Test Setup123
Power Reference Level Test126
Adjustments131
Factory Selected Components131
Interrelated Adjustments132
Post-Repair Adjustments132
Analog to Digital Converter Slope Adjustment135
220 Hz Frequency Adjustment137
Replaceable Parts145
Abbreviations145
Factory Sealed Parts146
Parts List Backdating146
Parts List Updating146
Reference Designations148
Front Panel171
Rear Panel172
Cabinet Parts173
Code List of Manufacturers174
Manual Changes175
Service177
Service Sheets177
Block Diagrams177
Schematic Diagrams177
Service Tools178
Assembly Locations179
Parts and Cable Locations179
Heat Staking Tool179
Test Point and Adjustment Locations179
Service Aids on Printed Circuit Baords180
Other Service Documents180
Etched Circuit Soldering Equipment180
Troubleshooting181
Service Related Error Message181
After Service Safety Checks181
Schematic Diagram Notes182
Overall Block Diagram190
Principles of Operation190
General190
Power Meter Simplified Overall Diagram190
Controller Section191
Interrupt Control Routine Flowchart192
Task 1 Flowchart193
Power Supply Section196
Troubleshooting Hints197
Simplified Power Supply Grounding197
Power Meter Service Position198
Abnormal Indications199
Display Enable Waveform200
Power Displayed for 1 Mw Power Reference201
Memory Check210
Data Bus Test Pattern210
Signature Analysis Check211
Signature Multimeter Control Settings211
Amplifier Section215
Amplifier, Detector, Filter and Comparator Circuits218
1 Mw 50 Mhz Power Reference Circuit220
Digital Filter Software Routine220
Power Sensor to First Amplifier Interface Check221
Phase Detector Drive222
Central Processing Unit Troubleshooting224
Extended Test Mode224
Extended Test Mode Error Messages225
Commands in Extended Test Mode226
Signature Analysis Mode Checks227
Free Run Signature Analysis227
Memory Data Bus Buffer Signatures228
Chip Select Signatures229
Address Bus Signatures233
Reset/Power Fail Test Voltage Checks233
Free Run Mode Troubleshooting234
Data Line Logic Levels234
Data Bus Tests235
Microprocessor Data Bus Buffer Check235
Microprocessor Data Bus Buffer Signatures236
I/O Data Bus Check238
I/O Data Bus Buffer Signatures239
I/O and Display Address Decode Signatures240
Miscellaneous Checks244
Keyboard Priority Encoder244
Addressable Display Latch244
Signature Analysis Mode Troubleshooting245
Keyboard Assembly Component Locations245
A3 Assembly247
Display Assembly Troubleshooting253
Fault Isolation Procedure253
Anode Data Display Drivers Voltage Levels254
Input Amplifier Circuit Troubleshooting258
Selected Amplifier AC Signal259
Amplifier Test260
220 Hz Buffer Test261
220 Hz Multivibrator Test261
Channel Selection Circuitry Test262
Multivibrator Waveforms262
Decoupled Power Supply Test263
P/O Main Amplifier Assembly Troubleshooting265
Power Supply Checks265
Problem Isolation Using Signature Analysis265
Digital I/O Test266
Digital I/O Signatures267
Auto Zero DAC and Buffer Test268
Zero BAC Buffer Signatures269
Offset DAC Buffer Signatures270
Offset Removal DAC Test Signal270
Gain DAC, Buffer and Gain Compensation Test271
Recorder Output Test Signal271
Gain DAC Buffer Signatures272
Miscellaneous Buffer Test272
Stable Current Source273
Cal Oscillator Control Test273
Miscellaneous Buffer Signatures273
Ramp End Waveform277
Analog to Digital Converter Ramp Waveform277
Variable Gain Amplifier Waveform278
AC Gain Stage Waveform278
Analog to Digital Input Waveform279
Gain/Attenuator Buffer279
Gain/Attenuator Buffer Signatures280
A/D Input Multiplexer Signatures280
Ramp Start Gate Waveform281
Range Attenuator281
Variable Gain Amplifier282
AC Gain Stage Test282
Synchronous Phase Detector Test282
Synchronous Phase Detector Output Waveform283
Phase Detector Drive Waveforms283
Phase Detector Control Waveform285
Low Pass Filters285
Analog/Digital Input Multiplexer Test286
Sensor Resistor Selection Test287
"A" Ground Circuit Test288
P/O Power Supply Circuits Troubleshooting291
Fault Isolation291
+5 Volt Digital Supply Test291
+5 Volt Display Supply Waveform292
Total Power Failure Test293
Rectifier Assembly Component Locations294
P/O Interconnect Assembly Component Locations295
Regulator Assembly Component Locations297
Power Reference Oscillator Circuit Troubleshooting302
50 Mhz Oscillator302
ALC Loop and Power Supply302
Internal Top View305
Internal Bottom View306

HP 438A - MANUAL CHANGES

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